@inproceedings{HaaseReinholdWolletal., author = {Haase, Florian Vincent and Reinhold, Maximilian and Woll, Ralf and Wolf, Matthias and Seidlitz, Holger}, title = {Reliability capability assessment of cooperative networks using the example of developing demonstrators of structured materials}, series = {Risk, Reliability and Safety: Innovating Theory and Practice, Proceedings of the ESREL 2016, Glasgow (United Kingdom)}, booktitle = {Risk, Reliability and Safety: Innovating Theory and Practice, Proceedings of the ESREL 2016, Glasgow (United Kingdom)}, editor = {Walls, Lesley and Revie, Matthew and Bedford, Tim}, publisher = {CRC Press}, address = {Boca Raton}, isbn = {978-1-138-02997-2}, pages = {1323 -- 1329}, language = {en} } @inproceedings{SeidlitzBambachFritzscheetal., author = {Seidlitz, Holger and Bambach, Markus and Fritzsche, Sebastian and Gerstenberger, Colin}, title = {High load-bearing multi-material-joints for metal sheets and composites by incremental in-situ forming processes}, series = {ESAFORM 2016, proceedings of the 19th International ESAFORM Conference on Material Forming, conference date: 27-29 April 2016, Nantes, France}, booktitle = {ESAFORM 2016, proceedings of the 19th International ESAFORM Conference on Material Forming, conference date: 27-29 April 2016, Nantes, France}, publisher = {AIP Publishing}, address = {Melville, NY}, isbn = {978-0-7354-1427-3}, doi = {10.1063/1.4963464}, language = {en} } @inproceedings{MaqboolElzeSeidlitzetal., author = {Maqbool, Fawad and Elze, Lars and Seidlitz, Holger and Bambach, Markus}, title = {Comparison of Manufacturing of Lightweight Corrugated Sheet Sandwiches by Hydroforming and Incremental Sheet Forming}, series = {ESAFORM 2016, proceedings of the 19th International ESAFORM Conference on Material Forming, conference date: 27-29 April 2016, Nantes, France}, booktitle = {ESAFORM 2016, proceedings of the 19th International ESAFORM Conference on Material Forming, conference date: 27-29 April 2016, Nantes, France}, publisher = {AIP Publishing}, address = {Melville, NY}, isbn = {978-0-7354-1427-3}, doi = {10.1063/1.4963456}, language = {en} } @inproceedings{SeidlitzKukeTsombanis, author = {Seidlitz, Holger and Kuke, Felix and Tsombanis, Nikolas}, title = {Leichtbautechnologien und Mischbauweisen mit Faser-Kunststoff-Verbunden}, series = {Innovationsforum des Regionalen Wachstumskerns Westlausitz, Cottbus, 2016}, booktitle = {Innovationsforum des Regionalen Wachstumskerns Westlausitz, Cottbus, 2016}, pages = {19}, language = {de} } @inproceedings{SeidlitzFritzscheSchleussetal., author = {Seidlitz, Holger and Fritzsche, Sebastian and Schleuß, Leander and Ossenbrink, Ralf and Michailov, Vesselin}, title = {Neuartige F{\"u}getechnologie zum Herstellen von hochbelastbaren Multi-Material-Bauweisen aus textilverst{\"a}rkten Kunststoffen und Metallen bei einseitiger Zug{\"a}nglichkeit der F{\"u}gestelle}, series = {DVS Congress 2016, Große Schweißtechnische Tagung, Vortr{\"a}ge der Veranstaltungen in Leipzig am 19. und 20. September 2016}, booktitle = {DVS Congress 2016, Große Schweißtechnische Tagung, Vortr{\"a}ge der Veranstaltungen in Leipzig am 19. und 20. September 2016}, publisher = {DVS-Verlag}, address = {D{\"u}sseldorf}, isbn = {978-3-945023-74-7}, pages = {424 -- 428}, language = {de} } @inproceedings{FritzscheSeidlitzWinkelmannetal., author = {Fritzsche, Sebastian and Seidlitz, Holger and Winkelmann, Kai and Michailov, Vesselin}, title = {Structural reinforced FRP sandwich constructions for lightweight floor panels}, series = {Conference papers, APT '15, 11th International Conference Advances in Plastics Technology, Sosnowiec, 13 - 15 October 2015}, booktitle = {Conference papers, APT '15, 11th International Conference Advances in Plastics Technology, Sosnowiec, 13 - 15 October 2015}, editor = {Pająk, Anna}, address = {Gliwice}, isbn = {978-83-63555-47-4}, language = {en} } @inproceedings{GerstenbergerSeidlitzOsieckietal., author = {Gerstenberger, Colin and Seidlitz, Holger and Osiecki, Tomasz and Kroll, Lothar}, title = {Bionic Inspired High Stressable Joints for Multi-material Constructions with FRP and Metals}, series = {Materials Science Engineering (MSE 2014), Darmstadt, 2014}, booktitle = {Materials Science Engineering (MSE 2014), Darmstadt, 2014}, language = {en} } @inproceedings{SchulzeSeidlitzKoenigetal., author = {Schulze, Marcus and Seidlitz, Holger and K{\"o}nig, Franziska and Weiß, Sabine}, title = {Nanoindentation measurements of PVD coated multilayer constructions}, series = {Programme and proceedings of the 22nd Winter International Scintific Conference on Achivements in Mechanical and Materials Engineering (AMME'15), Gliwice - Zakopane (Poland), 2015}, booktitle = {Programme and proceedings of the 22nd Winter International Scintific Conference on Achivements in Mechanical and Materials Engineering (AMME'15), Gliwice - Zakopane (Poland), 2015}, editor = {Dobrzański, Leszek A.}, publisher = {Gliwice}, address = {International OCSCO World Press}, isbn = {978-83-63553-39-5}, language = {en} } @misc{SeidlitzSimonElzeetal., author = {Seidlitz, Holger and Simon, Sylvio and Elze, Lars and Schulze, Marcus}, title = {Herstellung von strukturierten Leichtbaukomponenten}, language = {de} } @misc{SeidlitzElzeSchulze, author = {Seidlitz, Holger and Elze, Lars and Schulze, Marcus}, title = {Eigenschaften strukturierter Leichtbaukomponenten}, language = {de} } @inproceedings{HackertGerstenbergerOsieckietal., author = {Hackert, Alexander and Gerstenberger, Colin and Osiecki, Tomasz and Seidlitz, Holger}, title = {Hybrid sandwich composites with porous aluminum core and thermoplastic fiber-reinforced composite top layers}, series = {Proceedings of the 23rd Annual International Conference on Composites/Nano Engineering (ICCE23), Chengdu (China), 2015}, booktitle = {Proceedings of the 23rd Annual International Conference on Composites/Nano Engineering (ICCE23), Chengdu (China), 2015}, pages = {247 -- 248}, language = {en} } @inproceedings{OsieckiGerstenbergerHackertetal., author = {Osiecki, Tomasz and Gerstenberger, Colin and Hackert, Alexander and Kroll, Lothar and Seidlitz, Holger}, title = {Thermoplastic fiber reinforced/metal-hybrid laminates for structural lightweight applications}, series = {Proceedings of the 23rd Annual International Conference on Composites/Nano Engineering (ICCE23), Chengdu (China), 2015}, booktitle = {Proceedings of the 23rd Annual International Conference on Composites/Nano Engineering (ICCE23), Chengdu (China), 2015}, pages = {595 -- 596}, language = {en} } @inproceedings{GerstenbergerHackertOsieckietal., author = {Gerstenberger, Colin and Hackert, Alexander and Osiecki, Tomasz and Kroll, Lothar and Seidlitz, Holger}, title = {Load adjusted fiber reinforced polymer/metal joints in cathodic dip paint conditions}, series = {Proceedings of the 23rd Annual International Conference on Composites/Nano Engineering (ICCE23), Chengdu (China), 2015}, booktitle = {Proceedings of the 23rd Annual International Conference on Composites/Nano Engineering (ICCE23), Chengdu (China), 2015}, pages = {227 -- 228}, language = {en} } @misc{SeidlitzFritzscheKlosheketal., author = {Seidlitz, Holger and Fritzsche, Sebastian and Kloshek, Alexander and Ambrosio, Marcello}, title = {Advanced welding technology for highly stressable multi material designs with fiber-reinforced plastics and metals}, series = {Open Journal of Composite Materials}, volume = {7}, journal = {Open Journal of Composite Materials}, number = {3}, issn = {2164-5655}, doi = {10.4236/ojcm.2017.73010}, pages = {166 -- 177}, abstract = {Organic sheets made out of fiber-reinforced thermoplastics are able to make a crucial contribution to increase the lightweight potential of a design. They show high specific strength- and stiffness properties, good damping characteristics and recycling capabilities, while being able to show a higher energy absorption capacity than comparable metal constructions. Nowadays, multi-material designs are an established way in the automotive industry to combine the benefits of metal and fiber-reinforced plastics. Currently used technologies for the joining of organic sheets and metals in large-scale production are mechanical joining technologies and adhesive technologies. Both techniques require large overlapping areas that are not required in the design of the part. Additionally, mechanical joining is usually combined with "fiber-destroying" pre-drilling and punching processes. This will disturb the force flux at the joining location by causing unwanted fiber- and inter-fiber failure and inducing critical notch stresses. Therefore, the multi-material design with fiber-reinforced thermoplastics and metals needs optimized joining techniques that don't interrupt the force flux, so that higher loads can be induced and the full benefit of the FRP material can be used. This article focuses on the characterization of a new joining technology, based on the Cold Metal Transfer (CMT) welding process that allows joining of organic sheets and metals in a load path optimized way, with short cycle times. This is achieved by redirecting the fibers around the joining area by the insertion of a thin metal pin. The path of the fibers will be similar to paths of fibers inside structures found in nature, e.g. a knothole inside of a tree. As a result of the bionic fiber design of the joint, high joining strengths can be achieved. The increase of the joint strength compared to blind riveting was performed and proven with stainless steel and orthotropic reinforced composites in shear-tests based on the DIN EN ISO 14273. Every specimen joined with the new CMT Pin joining technology showed a higher strength than specimens joined with one blind rivet. Specimens joined with two or three pin rows show a higher strength than specimens joined with two blind rivets.}, language = {en} } @misc{SanthanakrishnanBalakrishnanSeidlitzAmbrosioetal., author = {Santhanakrishnan Balakrishnan, Venkateswaran and Seidlitz, Holger and Ambrosio, Marcello and Schuhmann, Tilo}, title = {Study on the Quality of Quasi-Isotropic Composite Laminates Containing a Circular Hole}, series = {Journal of Materials Science Research}, volume = {6}, journal = {Journal of Materials Science Research}, number = {4}, issn = {1927-0593}, doi = {10.5539/jmsr.v6n4p67}, pages = {67 -- 78}, abstract = {Composite structures used in modern engineering applications are often subjected to circular holes in order to join with metal components via riveting, bolting or pinning joints. These design based holes will interrupt the force flux in the direction of the fibers and create high stress concentrations near the notched area. Objective of the project is to understand the quality of the quasi-isotropic composite laminates ([45°, -45°, 0°, 90°]S) containing circular hole. To achieve this objective, a 3-phase portal milling machine and a 5kW continuous wave (cw) CO2 laser system were used to produce the circular holes in the composite laminates. The processing parameters for both the processes are varied to understand its influence. The quality of the circular hole produced by these methods are further investigated and compared in order to arrive at the optimum processing parameters for the given quasi-isotropic composite laminates. The hole qualities were evaluated by means of delamination factor caused by milling; cone angle, matrix evaporation for cw-CO2 laser system. For further comparisons, the optimal parameter combinations of both methods were selected for a tensile test according to the standard ASTM D5766-2002.}, language = {en} } @misc{SanthanakrishnanBalakrishnanSeidlitz, author = {Santhanakrishnan Balakrishnan, Venkateswaran and Seidlitz, Holger}, title = {Potential repair techniques for automotive composites: A review}, series = {Composites Part B: Engineering}, journal = {Composites Part B: Engineering}, number = {145}, issn = {1359-8368}, doi = {10.1016/j.compositesb.2018.03.016}, pages = {28 -- 38}, abstract = {Composite materials have gained popularity in automotive industries due to its lightweight potential, good damping behaviour as well as high strength and stiffness properties. Based on the increase in usage of composites, there is a growing interest for a repair technique in the automotive industry. Along with these raise in demand there comes a need for an all-inclusive review article and the objective of this article is to address this need. Two repair techniques, namely scarfing repair and injection repair, have the potential to be used in automotive industry. This paper compiles the various research work done in this field of repairing along with various processing steps associated with it. Further this paper reviews the non-destructive technique that can be used for damage identification and repair assessment.}, language = {en} } @inproceedings{SeidlitzKukeTsombanis, author = {Seidlitz, Holger and Kuke, Felix and Tsombanis, Nikolas}, title = {Advanced joining technology for the production of highly stressable lightweight structures, with fiber-reinforced plastics and metal}, series = {3rd International MERGE Technologies Conference (IMTC), Chemnitz, 2017}, volume = {1}, booktitle = {3rd International MERGE Technologies Conference (IMTC), Chemnitz, 2017}, number = {2}, doi = {10.21935/tls.v1i2.76}, pages = {54 -- 67}, abstract = {Organic sheets made of fiber-reinforced thermoplastics can make a crucial contribution to increase the lightweight potential of a technical design. They show high specific strength- and stiffness properties as well as good damping characteristics, while being able to show a higher energy absorption capacity than comparable metal constructions. In addition, organic sheets provide good recycling capabilities. Nowadays, multi-material designs are an established way in the automotive industry to combine the benefits of metal and fiber-reinforced plastics (FRP). Currently used technologies for the joining of organic sheets and metals in large-scale production are mechanical joining and adhesive technologies. Both require large overlapping areas to achieve the desired joint strength and stiffness of the technical design. Additionally, mechanical joining is usually combined with "fiber-destroying" pre-drilling and punching processes. This will disturb the force flux at the joint zone by causing unwanted fiber- and inter-fiber failure and inducing critical notch stresses. Therefore, the multi-material design with fiber-reinforced thermoplastics and metals needs optimized joining techniques that don't interrupt the force flux, so that higher loads can be induced and the full benefit of the FRP material can be used. This article focuses on the characterization of a new joining technology, based on the Cold Metal Transfer (CMT) welding process, that allows to join organic sheets and metals in a load path optimized design. This is achieved by realigning the fibers around the joint zone by the integration of a thin metal pin. The alignment of the fibers will be similar to load paths of fibers inside structures found in nature. A tree with a knothole is always going to align its fibers in principle stress direction. As a result of the bionic fiber design, high joining strengths can be achieved. The increase of the joint strength compared to blind riveting was performed and proven with stainless steel and orthotropic reinforced composites in tensile shear-tests, based on the DIN EN ISO 14273.}, language = {en} } @misc{SchleussSeidlitzMichailov, author = {Schleuß, Leander and Seidlitz, Holger and Michailov, Vesselin}, title = {Neue F{\"u}getechnologie f{\"u}r Mischverbindungen}, language = {de} } @misc{SanthanakrishnanBalakrishnanSeidlitzWartigetal., author = {Santhanakrishnan Balakrishnan, Venkateswaran and Seidlitz, Holger and Wartig, Kevin and Tsombanis, Nikolas}, title = {Influence of processing parameters on the impact behaviour of glass/polyamide-6 composite}, series = {Composites Part B: Engineering}, volume = {159}, journal = {Composites Part B: Engineering}, issn = {1359-8368}, doi = {10.1016/j.compositesb.2018.09.064}, pages = {292 -- 299}, abstract = {This study aims to investigate the low-velocity impact response and post-impact flexural behaviour of glass/polyamide-6 (G/PA-6) composite. G/PA-6 composites with a layup configuration of [02,902]s were prepared via press-forming technique. Composite samples were developed using four different processing conditions, by modifying compression pressure and heating temperature. Local variations of fiber volume and porosity fraction were noticed for samples developed in each processing conditions. On the investigated samples, damages were induced by using 35 joule of drop weight impact to investigate the impact resistance of samples with respect to different processing conditions. The damage behaviour and residual flexural strength was characterized using a micro-CT and three-point bending tests respectively. Furthermore, the influence of porosity fraction on the residual flexural strength were investigated. This paper will provide necessary fundamental knowledge for future selection of processing parameters in order to have enhanced impact performance.}, language = {en} } @misc{SanthanakrishnanBalakrishnanSeidlitzWeiss, author = {Santhanakrishnan Balakrishnan, Venkateswaran and Seidlitz, Holger and Weiß, Sabine}, title = {Layup Configuration Effect on Notch Residual Strength in Composite Laminates}, series = {Materials}, volume = {11}, journal = {Materials}, number = {2}, issn = {1996-1944}, doi = {10.3390/ma11020308}, pages = {12}, abstract = {The current trend shows an increasing demand for composites due to their high stiffness to weight ratio and the recent progress in manufacturing and cost reduction of composites. To combine high strength and stiffness in a cost-effective way, composites are often joined with steel or aluminum. However, joining of thermoset composite materials is challenging because circular holes are often used to join them with their metal counterparts. These design based circular holes induce high stress concentration around the hole. The purpose of this paper is to focus on layup configuration and its impact on notch stress distribution. To ensure high quality and uniformity, the holes were machined by a 5 kW continuous wave (cw) CO2 laser. The stress distribution was evaluated and compared by using finite element analysis and Lekhnitskii's equations. For further understanding, the notch strength of the laminates was compared and strain distributions were analyzed using the digital image correlation technique.}, language = {en} }