@misc{BłędzkiSeidlitzKoehleretal., author = {Błędzki, Andrzej and Seidlitz, Holger and K{\"o}hler, Mathias and Urbaniak, Magdalena and Demski, Szymon and Boczkowska, Anna}, title = {Reusing and recycling of composite wind turbine blades. A review of current practices and prospects. Part 5**. New industrial projects. Wind energy in China}, series = {Przemysł chemiczny}, volume = {104}, journal = {Przemysł chemiczny}, number = {1}, publisher = {Wydawnictwo SIGMA-NOT, sp. z.o.o.}, issn = {0033-2496}, doi = {10.15199/62.2025.1.11}, pages = {142 -- 152}, abstract = {A review, with 23 refs., of projects mainly from last 2 years currently commercialized by large consortia often in cooperation with academic teams. Many detail information about wind energy development and wind turbine blades recycling in China was delivered.}, language = {en} } @article{HartungSeidlitzOsieckietal., author = {Hartung, David and Seidlitz, Holger and Osiecki, Tomasz and Sztorch, Bogna and Przekop, Robert E. and Kazimierczuk, Magdalena}, title = {Flax fiber reinforced PET-G composites with improved interfacial adhesion}, series = {Polimery}, volume = {70}, journal = {Polimery}, number = {2}, publisher = {LUKASIEWICZ Research Network - Industrial Chemistry Research Institute}, address = {Warsaw}, issn = {2957-0263}, doi = {10.14314/polimery.2025.2.4}, pages = {113 -- 123}, abstract = {Recycled PET-G (rPET-G) composites reinforced with flax fiber were obtained. To improve interfacial adhesion, the fiber was treated by washing and finishing with bio-based epoxidized soybean oil and admixture acid. The effect of fiber surface treatment on its properties and those of the composites was evaluated by TGA, FT-IR and SEM, as well as by contact angle, flexural and tensile measurements. The results indicated delayed degradation of the treated flax fiber with a fiber mass loss of about 4 wt\%. The flexural strength and modulus increased for the washed and finished flax fiber compared to the untreated one. While the tensile properties were influenced by structural effects resulting from the fiber treatment. These findings contribute to the development of more sustainable and high-performance natural fiber-reinforced thermoplastic composites.}, language = {en} } @misc{SztorchPakułaFrydrychetal., author = {Sztorch, Bogna and Pakuła, Daria and Frydrych, Miłosz and Romańczuk-Ruszuk, Eliza and Osiecki, Tomasz and Sedlitz, Holger and Przekop, Robert E.}, title = {SH-SSQ as a modifier for superior mechanical properties and improved plasticity of 3D printed PLA}, series = {Scientific Reports}, volume = {15}, journal = {Scientific Reports}, number = {1}, publisher = {Springer Science and Business Media LLC}, issn = {2045-2322}, doi = {10.1038/s41598-025-86365-5}, pages = {1 -- 14}, abstract = {This work confirms that the use of silisequioxanes in the modification of polymeric and composite materials to change their properties is possible in the range of low modifier concentrations, not exceeding 2.5\%. This study investigates the impact of (3-thiopropyl)polysilsesquioxane (SSQ-SH) on the properties of polylactide (PLA) for 3D printing. Microscopic analysis using SEM and EDS mapping proved that SSQ-SH is well dispersed in the polymer matrix in the concentration range of 0.25-2.5 wt\%, agglomerations were observed at 5 wt\% concentration, which reduces the homogeneity of the material and is also reflected in the mechanical test results. Mechanical testing shows SSQ-SH enhances flexibility and toughness, with the most significant improvements observed at 1 wt\% and 1.5 wt\% concentrations. Specifically, elongation at break increases by up to 56\% and impact strength by up to 37\% compared to unmodified PLA. These results suggest SSQ-SH is an effective plasticizer, improving interlayer adhesion and reducing brittleness. The optimal SSQ-SH concentrations for maximizing mechanical performance and material integrity are 1 wt\% and 1.5 wt\%. Part of the produced samples was conditioned in a climatic chamber, it was observed based on DSC and XRD analysis that the crystallinity of the materials significantly increases after exposure to UV radiation, which is also confirmed by microscopic observations. This study highlights the potential of SSQ-SH in improving the performance of 3D printed PLA materials and efficient modification is possible even in the range of low modifier concentrations, not exceeding 2.5\%.}, language = {en} } @misc{SeidlitzGebhardStamp, author = {Seidlitz, Holger and Gebhard, Johannes and Stamp, Benno}, title = {Nicht nur leicht, sondern auch recycelbar : Monomaterial ersetzt Multimaterialverbunde im Automobilinnenraum}, series = {Kunststoffe}, volume = {2025}, journal = {Kunststoffe}, number = {03}, publisher = {Carl Hanser Verlag}, address = {M{\"u}nchen}, issn = {0023-5563}, pages = {18 -- 21}, abstract = {Leichtbau spielt nicht nur bei Automobilen mit Verbrennungsmotoren, sondern auch bei Elektrofahrzeugen eine wichtige Rolle. Die daf{\"u}r genutzten Materialverbunde lassen sich h{\"a}ufig jedoch nicht recyceln. Bei Mercedes-Benz setzt man deshalb seit Kurzem im Interieur auf Monomaterialsandwiche. Diese verbessern nicht nur die Recyclingf{\"a}higkeit, sondern bringen teilweise auch mehr Leistung.}, language = {de} } @misc{SeidlitzGebhardStamp, author = {Seidlitz, Holger and Gebhard, Johannes and Stamp, Benno}, title = {Not only lightweight, but also recyclable : mono-material replaces multi-material composites in car interiors}, series = {Plastics insight}, volume = {2025}, journal = {Plastics insight}, number = {03}, publisher = {Carl Hanser Verlag}, address = {M{\"u}nchen}, issn = {2941-4202}, pages = {13 -- 17}, abstract = {Lightweight construction plays an important role not only in cars with combustion engines but also in electric vehicles. However, the composite materials used for this purpose are often not recyclable. Mercedes-Benz has therefore recently started developing mono-material sandwiches for the interior. These not only improve recyclability, but also increase performance in some cases.}, language = {en} } @misc{HajhaririEberweinCampleseetal., author = {Hajhariri, Aliasghar and Eberwein, Robert and Camplese, Davide and Scarponi, Giordano Emrys and Otremba, Frank and Cozzani, Valerio and Seidlitz, Holger}, title = {A comprehensive numerical study of the behaviour of an LH2 storage tank in the event of a fire}, series = {Chemical engineering transactions}, journal = {Chemical engineering transactions}, number = {116}, publisher = {AIDIC Servizi S.r.l.}, address = {Milano}, isbn = {979-12-81206-18-2}, issn = {2283-9216}, doi = {10.3303/CET25116114}, pages = {679 -- 684}, abstract = {As the world moves towards green energy production, effective storage and transportation solutions become essential. To support this transition, energy carriers with minimal or zero environmental impact are required. Liquified hydrogen represents a promising candidate due to its emissions-neutral properties. However, its highly flammable nature necessitates adherence to strict safety codes and standards. Storing hydrogen often requires advanced super-insulation materials. To enhance the safety of cryogenic hydrogen storage tanks under extreme conditions, such as those encountered during fire accidents, it is crucial to understand the thermal behaviour of the tank. Predicting pressurization and potential failure in advance demands a robust and comprehensive model. However, still such models suffer lack of detailed heat transfer models which account for various sub-processes during an accident scenario. Hence, this study introduces a comprehensive model for the pressurization of cryogenic tanks equipped with multi-layer insulation (MLI) systemsin the event of fire, which comprises several sub-models. These sub-models account for heat transfer phenomena through the thermal insulation at nominal conditions and its thermal degradation during fire exposure, the fluid, the internal pressurization, and the performance of the pressure relief valve. This study provides valuable insights into the safety and the behaviour of hydrogen storage tanks under thermal loads.}, language = {en} } @misc{HajhaririEberweinCampleseetal., author = {Hajhariri, Aliasghar and Eberwein, Robert and Camplese, Davide and Scarponi, Giordano Emrys and Otremba, Frank and Cozzani, Valerio and Seidlitz, Holger}, title = {Repeatable testing of a cryogenic storage tank with variable insulation material in fire like conditions}, series = {Cryogenics 2025 : proceedings of the 18th IIR International Conference on Cryogenics}, volume = {2025}, journal = {Cryogenics 2025 : proceedings of the 18th IIR International Conference on Cryogenics}, publisher = {Institut International du Froid}, address = {Paris}, doi = {10.18462/iir.cryo.2025.0007}, pages = {6}, abstract = {For decarbonizing the energy industry and transport, cryogenic energy carriers have great potential. The storage takes place in tanks with thermal super-insulations, which are in application for decades, but there is only limited knowledge about its behaviour in a fire scenario. This represents a major incident that may generate extraordinary loads on the tank and its insulation system, and that eventually lead to a sudden tank failure. This paper presents a test rig called the Cryogenic High Temperature Thermal Vacuum Chamber (CHTTVC), which can be used to test typical thermal superinsulation's under cryogenic and fire-like conditions in parallel. The test method makes it possible to measure the heat flow through the thermal superinsulation over time and to investigate the degradation behaviour of the insulation within a test. In the paper results from the first tests are presented.}, language = {en} } @phdthesis{Popiela, author = {Popiela, Bartosz Maciej}, title = {Einfluss fertigungsbedingter Eigenspannungen auf die Betriebssicherheit von nassgewickelten Composite-Druckbeh{\"a}ltern mit einem nichttragenden Liner}, publisher = {Brandenburgische Technische Universit{\"a}t}, address = {Cottbus ; Senftenberg}, doi = {10.26127/BTUOpen-7238}, pages = {xv, 137}, abstract = {Im Hinblick auf die globale Herausforderung der Energietransformation steigt der Bedarf an M{\"o}glichkeiten zur Energiespeicherung. Eine Technologie, die zunehmend in den Fokus r{\"u}ckt, ist die Energiespeicherung mittels komprimiertem Wasserstoffgas. Insbesondere f{\"u}r mobile und Transport-Anwendungen ist eine geringe Masse des Speichers vorteilhaft, weshalb vollumwickelte Composite-Druckbeh{\"a}lter des Typs 4 zum Einsatz kommen. Diese werden {\"u}berwiegend im Nasswickelverfahren gefertigt, das durch zahlreiche Prozessparameter und physikalische Effekte charakterisiert wird. Die Wahl der Wickelprozessparameter sowie Schwankungen der Materialkennwerte beeinflussen den Eigenspannungszustand in der Composite-Struktur eines Druckbeh{\"a}lters. Somit wirken sie sich auch auf den Spannungszustand im Betrieb aus. Die vorliegende Dissertation beinhaltet Untersuchungen des Einflusses von fertigungsbedingten Eigenspannungen auf die Sicherheit von Composite-Druckbeh{\"a}ltern mit nichttragendem Kunststoff-Liner. Ziel ist es, das mechanische Verhalten von Composite-Druckbeh{\"a}ltern besser zu verstehen und deren Sicherheitsniveau sowie Konkurrenzf{\"a}higkeit weiter zu steigern. Schwerpunkte der Arbeit sind experimentelle Untersuchungen der Eigenspannungsentstehung und -entwicklung sowie deren Einfluss auf die Beh{\"a}lter-Sicherheit. Im Fokus befindet sich die Exploration von M{\"o}glichkeiten zur Verbesserung der Zuverl{\"a}ssigkeit der Beh{\"a}lter durch Variation der Fertigungsparameter und eine Konditionierung nach der Fertigung. Der Eigenspannungszustand wird in numerischen Simulationen sowie mit dem zerst{\"o}renden Bohrlochverfahren charakterisiert. Die {\"U}berwachung der Spannungsumlagerung w{\"a}hrend einer Konditionierung unter Zeitstandbelastung erfolgt mit eingebetteten faseroptischen Sensoren, die sp{\"a}ter zur Dehnungsmessung in zerst{\"o}renden, langsamen Berstpr{\"u}fungen eingesetzt werden. Zur Vertiefung des Verst{\"a}ndnisses des Versagensverhaltens der verwendeten 6,8 l-Druckbeh{\"a}lter wird die Finite-Elemente-Methode eingesetzt. Dar{\"u}ber hinaus werden Qualit{\"a}tsuntersuchungen der Composite-Struktur mittels Mikro-Computertomographie und Impuls-Echo-Verfahren beschrieben. Die Ergebnisse der Untersuchungen zeigen, dass eine Steigerung der Zuverl{\"a}ssigkeit durch eine gezielte Innendruckbeanspruchung der gewickelten Beh{\"a}lter nahezu kostenneutral m{\"o}glich ist. Dies wird im Rahmen der Arbeit anhand eines Baumusters demonstriert. Dar{\"u}ber hinaus wird die Verbesserung der Zuverl{\"a}ssigkeit der Beh{\"a}lter im Rahmen einer Konditionierung unter Zeitstandbelastung vertieft diskutiert. Diese stellt eine weiterf{\"u}hrende M{\"o}glichkeit dar, das Beh{\"a}lterverhalten positiv zu beeinflussen und das Sicherheitsniveau zu steigern.}, language = {de} } @misc{PopielaGuenzelOktavianyetal., author = {Popiela, Bartosz and G{\"u}nzel, Stephan and Oktaviany, Jennifer and Widjaja, Martinus Putra and Mair, Georg W. and Seidlitz, Holger}, title = {Influence of internal pressure regulation during filament winding on failure mechnism in type 4 pressure vessels : a case study}, series = {Proceedings of the 11th International Conference on Hydrogen Safety (ICHS 2025)}, journal = {Proceedings of the 11th International Conference on Hydrogen Safety (ICHS 2025)}, publisher = {Korea Gas Safety Corporation (KGS)}, pages = {1 -- 12}, abstract = {Hydrogen storage is a crucial part of the hydrogen value chain, particularly in terms of safety and social acceptance of hydrogen technologies. For on-board and transportation applications, hydrogen is commonly stored as a compressed gas in pressure vessels. Full composite wrapped Type 4 pressure vessels are especially beneficial due to their high weight-saving potential and their capability to withstand high working pressures. To maintain an appropriate safety level, the mechanical behavior of the composite structure has been the subject of investigation in numerous studies. In this study, the failure mechanisms of two designs of Type 4 cylinders are investigated. The two designs differ solely in the manufacturing process parameters, particularly the internal pressure applied during the filament winding process. Variations in internal pressure result in different residual stress states and changes in the quality of the composite structure. The stacking sequence, materials used, and other manufacturing parameters remain unchanged. The cylinders show different failure mechanisms in slow burst tests: one design fails in hoop windings, while the other one fails in helical windings, despite no stress exaggeration in the fiber direction being observed with embedded optical fibers or in numerical simulations. To explain the failure mechanisms, the quality of the cylinders is investigated. The results of X-ray computed tomography and pulse-echo investigation, highlight the complexity of the interactions between manufacturing process parameters, residual stresses, manufacturing quality, and the mechanical behavior of composite pressure vessels. Resin-rich areas in the composite material are identified as a possible cause of the differing failure mechanisms.}, language = {en} } @misc{PopielaSchukarBreithauptetal., author = {Popiela, Bartosz and Schukar, Marcus and Breithaupt, Mathias and G{\"u}nzel, Stephan and Mair, Georg W. and Krebber, Katerina and Seidlitz, Holger}, title = {Embedding of fiber optic sensors under industrial conditions and distributed strain sensing in type 4 composite pressure vessels}, series = {Proceedings of the 24th International Conference on Composite Materials (ICCM-24)}, journal = {Proceedings of the 24th International Conference on Composite Materials (ICCM-24)}, publisher = {The University of Delaware}, address = {Newark, Delaware}, doi = {10.5281/zenodo.18597801}, pages = {3710 -- 3717}, abstract = {The number of in-operation composite pressure vessels is increasing, partly due to their attractiveness for on-board compressed gas storage and transport applications. A possible way to maintain the highest safety levels is through the structural health monitoring of the composite cylinders. Here, the use of fiber optic sensors appears to be a promising approach. However, the integration of the optical fibers into the composite structure of a pressure vessel has been shown to be challenging. In this study, insights on the embedding of optical fibers in the composite structure under industrial conditions are provided. A protection concept for the ingress and egress of the optical fibers is presented. Finally, the results from destructive slow burst tests are evaluated, showing no clear trend in the impact of the embedded optical fibers on the performance of composite pressure vessels.}, language = {en} } @misc{KepirSeidlitzUlkeWinteretal., author = {Kepir, Yusuf and Seidlitz, Holger and Ulke-Winter, Lars and Felix, Kuke}, title = {Lightweight heat exchanger design using graphene-reinforced ceramics : a comparative study of dimensional and material effects}, series = {Proceedings of the 4th International Online Conference on Materials, 3-6 November 2025}, journal = {Proceedings of the 4th International Online Conference on Materials, 3-6 November 2025}, publisher = {MDPI}, address = {Basel}, abstract = {In high-temperature environments, heat exchangers require lightweight designs, high thermal resistance, and high effectiveness. Graphene-reinforced ceramic matrix composites (G-CMC) offer promising thermal properties for such applications. This study investigates the effectiveness changes of a block-type heat exchanger made of G-CMC, depending on the length and design, leveraging the potential of 3D printing in the production of complex geometries.}, language = {en} } @misc{KepirSeidlitzUlkeWinteretal., author = {Kepir, Yusuf and Seidlitz, Holger and Ulke-Winter, Lars and Kuke, Felix}, title = {Geometric optimization and advanced material integration for enhanced thermal performance of compact cross-flow heat exchangers in high-temperature applications}, series = {Proceedings of the 6th International Electronic Conference on Applied Sciences, 9-11 December 2025}, journal = {Proceedings of the 6th International Electronic Conference on Applied Sciences, 9-11 December 2025}, publisher = {MDPI}, address = {Basel}, abstract = {Heat exchangers used in high-temperature environments require lightweight designs with high thermal resistance and efficiency. This study numerically investigates the thermal performance of a multi-channel compact cross-flow heat exchanger, focusing on geometric configurations and material selection.}, language = {en} } @misc{DemetKepirGunozetal., author = {Demet, Seyit Mehmet and Kepir, Yusuf and Gunoz, Alper and Sepetcioglu, Harun and Bagci, Mehmet and Kara, Memduh}, title = {Erosive wear behavior of FRP composite pipes under varying impingement angles, impact velocities and flow directions}, series = {International journal of pressure vessels and piping}, volume = {219}, journal = {International journal of pressure vessels and piping}, publisher = {Elsevier BV}, address = {Amsterdam}, issn = {0308-0161}, doi = {10.1016/j.ijpvp.2025.105657}, pages = {1 -- 13}, abstract = {Fiber-reinforced polymer (FRP) composite pipes are emerging as superior alternatives in sectors such as oil and gas, chemical processing, and aerospace, owing to their high strength-to-weight ratio, corrosion resistance, and design flexibility; however, their long-term durability is susceptible to erosion wear when exposed to abrasive particles. This study experimentally investigates the solid particle erosion (SPE) behavior of filament-wound carbon (CFR/EP), glass (GFR/EP), and basalt (BFR/EP) fiber-reinforced epoxy pipes by ASTM G76-18. Tests were conducted under varied impingement angles (30°, 45°, 60°, 90°), flow directions (axial and radial), and particle velocities (28 and 34 m/s), using both erosion rate (ER) and volumetric material loss to assess performance. All composites demonstrated a semi-ductile erosion response, with degradation consistently peaking at a 45° impingement angle across all test conditions. An increase in particle velocity from 28 to 34 m/s induced a near two-fold escalation in ER. Among the materials, BFR/EP exhibited the highest erosion rates, whereas CFR/EP was the most resistant. Notably, ER values were consistently higher in the axial flow direction, exceeding radial values by 20-40 \% under the most severe condition (45° at 34 m/s). Paradoxically, despite its lower ER, CFR/EP suffered greater volumetric material loss than GFR/EP, a discrepancy attributed to its significantly lower fiber volume fraction (42.4 \%) compared to GFR/EP (68.9 \%) and BFR/EP (59.7 \%). These findings emphasize that both ER and volumetric loss are critical metrics for designing thin-walled pipes, thereby providing a crucial scientific basis for material selection in environments characterized by erosive, multi-directional flow.}, language = {en} } @misc{HajhaririEberweinCampleseetal., author = {Hajhariri, Aliasghar and Eberwein, Robert and Camplese, Davide and Scarponi, Giordano Emrys and Cozzani, Valerio and Seidlitz, Holger}, title = {Cryogenic storage safety : experimental evaluation of insulation under extreme conditions}, series = {Journal of loss prevention in the process industries}, volume = {101}, journal = {Journal of loss prevention in the process industries}, publisher = {Elsevier BV}, address = {Amsterdam}, issn = {0950-4230}, doi = {10.1016/j.jlp.2026.105961}, pages = {1 -- 20}, abstract = {Hydrogen is recognized as a keystone of the global energy transition, offering a clean, high-energy-density energy carrier ideal for storage and transportation. Among various storage options, liquid hydrogen (LH2) is especially advantageous for both mobile and stationary applications. However, ensuring the safety and performance of LH2 storage systems under extreme thermal conditions, such as fire exposure, remains an engineering challenge. This study introduces an experimental framework, called the Cryogenic High-Temperature Thermal Vacuum Chamber (CHTTVC), designed to investigate the thermal-hydraulic response of vacuum-insulated cryogenic tanks under fire-like conditions. The apparatus enables evaluation of insulation performance, such as perlite and multilayer insulation (MLI), with a focus on thermal degradation, heat ingress, and vacuum stability. Results indicate that combustible MLIs undergo substantial thermal degradation, leading to heat ingress rates of up to 6.5 kW and the formation of hazardous combustion by-products. In contrast, non-combustible MLIs and bulk insulation materials restrict heat ingress to approximately 3 kW while more effectively preserving vacuum integrity. Combustible MLIs also exhibit pronounced pressure increases in the evacuated section, reaching ∼6 × 104 Pa, nearly six times higher than those observed for non-combustible counterparts. Analysis of effective emissivity further reveals an enhancement in radiative heat transfer, approximately five times, for combustible MLIs following degradation. Additionally, marked thermal stratification develops under both nominal and extreme heat loads, with temperature gradients approaching 10 °C per 100 mm during sustained thermal exposure.}, language = {en} } @misc{GunozKepirSepetciogluetal., author = {Gunoz, Alper and Kepir, Yusuf and Sepetcioglu, Harun and Kara, Memduh}, title = {Durability enhancement in aged composite pipes : low-velocity impact performance of basalt fiber reinforced polymer modified by graphene nanoplatelets}, series = {Journal of composite materials}, journal = {Journal of composite materials}, publisher = {SAGE Publications}, address = {London}, issn = {0021-9983}, doi = {10.1177/00219983251403123}, pages = {1 -- 16}, abstract = {Composite pipes, widely employed in the transport of natural gas, petroleum, and chemical fluids, are often exposed to low-velocity impact loads compromising structural integrity. Such impacts, coupled with prolonged exposure to environmental factors like water and elevated temperatures, accelerate material degradation. This study aims to evaluate the effectiveness of graphene nanoplatelets (GnPs) in enhancing the impact resistance and long-term durability of basalt fiber reinforced polymer (BFRP) composite pipes under hydrothermal aging conditions. Neat and 0.25 wt.\% GnPs reinforced BFRP composite pipes were fabricated via filament winding with a ±55° winding angle. The pipes were hydrothermally aged in water at 80°C for 15, 30, 45, and 60 days, followed by low-velocity impact tests at 20 and 40 J. The results revealed that increasing the energy from 20 to 40 J led to an increase in the maximum contact force by approximately 22\% in neat samples and about 35\% in GnPs reinforced samples, reflecting the enhanced rigidity and impact resistance provided by GnPs. Hydrothermal aging reduced the maximum contact force in all samples, with the most pronounced reduction after 60 days: neat samples decreased by approximately 57\%, whereas GnPs reinforced samples about 21\% at 40 J. These results indicate that GnPs mitigate aging-induced loss in impact performance by limiting rigidity reduction and damage propagation. Damage analysis further confirms the beneficial role of GnPs in preserving structural integrity under long-term aging. Overall, these findings highlight the potential of GnPs reinforced BFRP pipes for enhanced durability and impact resistance in industrial applications.}, language = {en} } @misc{PopielaGuenzelMairetal., author = {Popiela, Bartosz and G{\"u}nzel, Stephan and Mair, Georg W. and Seidlitz, Holger}, title = {Modelling of the manufacturing process related residual stresses in type 4 pressure vessels for hydrogen storage}, series = {European PhD Hydrogen Conference 2024 (EPHyC2024)}, journal = {European PhD Hydrogen Conference 2024 (EPHyC2024)}, pages = {445 -- 450}, abstract = {The publication is an extended abstract on the modelling of the manufacturing process related residual stresses in type 4 pressure vessels for hydrogen storage. A 2D analytical model based on the classical laminate theory and a 3D finite element model are introduced. The calculated residual stress state after the filament winding process as well as the stress state in service are presented and discussed.}, language = {en} } @incollection{KoehlerSeidlitz, author = {K{\"o}hler, Mathias and Seidlitz, Holger}, title = {Bio-Based Resins}, series = {ASM handbook : 21 composites}, booktitle = {ASM handbook : 21 composites}, editor = {Gianaris, Nicholas J. and Russell, John D.}, publisher = {ASM International}, address = {Materials Park, Ohio}, isbn = {978-1-62708-489-5}, doi = {10.31399/asm.hb.v21.a0007096}, pages = {1 -- 11}, abstract = {This article provides a general overview of bio-based resins, first examining biological sources for feedstocks of bio-based resin components, followed by a detailed description of five major resin classes (phenolic, furane, unsaturated polyester, epoxy, and benzoxazine resins) and their bio-based alternatives. It also describes the methods used to synthesize and modify the bio-based resins based on the biological feedstock, manufacturing processes, and properties of neat resins in comparison to fiber-reinforced composites. Then, the current work on novel bio-based vinyl ester, acrylic, and bismaleimide resins is highlighted. The article also reviews the work on the use of renewable resources to produce bio-resins with respect to composite applications, because only the development of bio-based resins leads to the production of sustainable green composites.}, language = {en} } @misc{GebhardSeidlitz, author = {Gebhard, Johannes and Seidlitz, Holger}, title = {Demontagegerechte thermoplastische Nietverbindung f{\"u}r das Fahrzeuginterieur}, series = {Automobiltechnische Zeitschrift : ATZ}, volume = {128}, journal = {Automobiltechnische Zeitschrift : ATZ}, number = {2-3}, publisher = {Springer Professional}, issn = {0001-2785}, doi = {10.1007/s35148-025-2330-z}, pages = {16 -- 23}, abstract = {Bei einigen Interieurkomponenten werden Reparaturen durch eine Vielzahl an nichtl{\"o}sbaren Verbindungselementen erschwert. Zudem fordern {\"o}kologische Vorgaben den {\"U}bergang zu Kreislaufmodellen. Bei Mercedes-Benz hat man eine Nietl{\"o}sung erarbeitet, die eine schnelle, kosteng{\"u}nstige De- und Remontage von Bauteilen unter Verwendung wiederverwertbarer Materialien gew{\"a}hrleistet.}, language = {de} } @misc{DreyerMuellerBernascheketal., author = {Dreyer, Christian and M{\"u}ller, Vivian C. and Bernaschek, Andreas and Frahm, Mike and Jankowski, Benjamin and Elagroudy, Youssef and Koppusch, Klarissa and Fiedler, Tom and Eckert, Angelika and Tatai, Tiberiu Mihai and Borges, Ralf and Behrendt, Felix and Fricke, Anna and Schreiner, Monika and Seidlitz, Holger}, title = {Functional integration of photonic components for (vertical) urban farming}, series = {Photonic Technologies in Plant and Agricultural Science III}, journal = {Photonic Technologies in Plant and Agricultural Science III}, editor = {Heinemann, Dag and Polder, Gerrit}, publisher = {SPIE}, address = {Bellingham, WA}, issn = {277-786X}, doi = {10.1117/12.3081069}, abstract = {The project Food4Future (F4F) is a long-term initiative funded by the German government. The decade-long project aims to develop groundbreaking ideas for urban farming, along with the corresponding materials, technologies and processes. It considers various future scenarios such as the collapse of global supply chains ("no trade") and a severe shortage of arable land ("no land"). Different strategies for cultivating organisms such as crickets, jellyfish, halophytes and algae in an urban environment are being developed. New modular cultivation compartments have been constructed and built which can be used as stand-alone units or in a paternoster (continuous loop) system. An overview is given on the functional integration of SMD-LEDs, ranging from large planar flat units for halophyte cultivation to salt water-resistant UV-LED light sabers for algae cultivation and LEDs integrated directly into transparent composites.}, language = {en} } @misc{GebhardSeidlitz, author = {Gebhard, Johannes and Seidlitz, Holger}, title = {Disassembly-optimized thermoplastic rivet connection for vehicle interiors}, series = {ATZ worldwide}, volume = {128}, journal = {ATZ worldwide}, number = {2-3}, publisher = {Springer Science and Business Media LLC}, address = {Wiesbaden}, issn = {2192-9076}, doi = {10.1007/s38311-025-2167-9}, pages = {16 -- 23}, abstract = {Repairs to some interior components are made difficult by a large number of non-detachable connecting elements. In addition, environmental regulations are calling for a transition to circular models. Mercedes-Benz has developed a rivet solution that ensures quick, cost-effective disassembly and reassembly of components using recyclable materials.}, language = {en} }