@phdthesis{Romano, author = {Romano, Marco}, title = {Charakterisierung von gewebeverst{\"a}rkten Einzellagen aus kohlenstofffaserverst{\"a}rktem Kunststoff (CFK) mit Hilfe einer mesomechanischen Kinematik sowie strukturdynamischen Versuchen}, publisher = {Shaker}, address = {Aachen}, isbn = {978-3-8440-5177-3}, doi = {10.2370/9783844051773}, pages = {254}, abstract = {Die vorliegende Arbeit behandelt die analytische und numerische Identifikation einer mesomechanischen Kinematik in gewebeverst{\"a}rkten Einzellagen sowie deren Validierung {\"u}ber die Strukturdynamik von flachen stabf{\"o}rmigen Probek{\"o}rpern aus kohlenstofffaserverst{\"a}rktem Kunststoff (CFK). Unter der Voraussetzung, dass das wiederholte Wirken der Kinematik Energie dissipiert, tr{\"a}gt sie bei zyklischer viskoelastischer Deformation zus{\"a}tzlich zur reinen viskoelastischen Werkstoffd{\"a}mpfung in gewebeverst{\"a}rkten Einzellagen bei. Die analytischen und numerischen Untersuchungen beschr{\"a}nken sich auf die Betrachtung des ebenen, zweidimensionalen Zusammenhangs einer vollst{\"a}ndigen Ondulation bzw. einer repr{\"a}sentativen Sequenz in Dickenrichtung. Zur Parameteridentifikation werden die geometrischen Abmessungen in definierten Schritten variiert. Daf{\"u}r wird der Grad der Ondulation in gewebeverst{\"a}rkten Einzellagen {\~O}=A/L als dimensionslose Kennzahl eingef{\"u}hrt. Zur Validierung der d{\"a}mpfungserh{\"o}henden Wirkung der in den analytischen und numerischen Untersuchung identifizierten mesomechanischen Kinematik in gewebeverst{\"a}rkten Einzellagen werden in experimentellen strukturdynamischen Untersuchungen frei abklingende Transversalschwingungen von einseitig fest eingespannten Probek{\"o}rpern untersucht. Im Detail werden flache stabf{\"o}rmige Probek{\"o}rper aus kohlenstofffaserverst{\"a}rktem Epoxidharz mit Lagenaufbauten aus 0°-unidirektionalen und gewebeverst{\"a}rkten Einzellagen untersucht. Die Ergebnisse der experimentellen strukturdynamischen Untersuchungen dienen schließlich der Validierung des analytischen Modells und der numerischen Berechnungen. Die d{\"a}mpfungserh{\"o}hende Wirkung der identifizierten mesomechanischen Kinematik wird schließlich in Abh{\"a}ngigkeit des eingef{\"u}hrten Grades der Ondulation {\~O} quantifiziert.}, language = {de} } @article{BohmannSchlampEhrlich, author = {Bohmann, T. and Schlamp, Matthias and Ehrlich, Ingo}, title = {Acoustic emission of material damages in glass fibre-reinforced plastics}, series = {Composites Part B: Engineering}, volume = {155}, journal = {Composites Part B: Engineering}, number = {December}, publisher = {Elsevier}, doi = {10.1016/j.compositesb.2018.09.018}, pages = {444 -- 451}, abstract = {The aim of this study is to compare two different standardized testing procedures, tensile testing and Mode-I double cantilever beam (DCB) testing, to evaluate a possible correlation between the dominant failure in glass fibre-reinforced plastics and their according acoustic emissions (AE). AE is processed by using a burst collection of all recorded transient signals and is further analysed with the k-means clustering algorithm. To generate damage related AE, a series of experiments for tensile testing and Mode-I DCB testing is performed on 16-layer glass fibre/epoxy specimens with a cross-ply lay-up for tensile and an unidirectional lay-up for Mode-I DCB testing. Three sensors at tensile testing and one sensor at Mode-I DCB testing gather AE data. The results of clustered burst signals show a good accordance between both testing procedures, with a similar weighted peak frequency (WPF) range in each classified cluster. In total, three different clusters are determined. An assignment of these three clusters to the three dominant damage mechanisms, visually observed by microscopy, is suggested.}, language = {en} } @techreport{ValentinoRomanoEhrlichetal., author = {Valentino, Piergiorgio and Romano, Marco and Ehrlich, Ingo and Furgiuele, Franco and Gebbeken, Norbert}, title = {Mechanische Charakterisierung von basaltfaser-verst{\"a}rkten Kunststoffen mit Gewebeverst{\"a}rkung - Numerische und experimentelle Untersuchungen}, series = {Forschungsbericht 2013}, journal = {Forschungsbericht 2013}, publisher = {inixmedia GmbH Marketing \& Medienberatung}, organization = {Ostbayerische Technische Hochschule Regensburg}, language = {de} } @inproceedings{Afanasev, author = {Afanasev, Anna}, title = {Force-oriented 3D printing of continuous fiber-reinforced plastic structures}, series = {Applied Research Conference 2019 - ARC 2019, 08 July 2019, Regensburg}, booktitle = {Applied Research Conference 2019 - ARC 2019, 08 July 2019, Regensburg}, editor = {Mottok, J{\"u}rgen and Reichenberger, Marcus}, publisher = {Pro Business GmbH}, address = {Berlin}, isbn = {978-3-96409-182-6}, pages = {213 -- 218}, subject = {Faserverbundwerkstoff}, language = {en} } @inproceedings{BaumerKastenmeierEhrlich, author = {Baumer, A. and Kastenmeier, Andreas and Ehrlich, Ingo}, title = {Investigation of Bolted Composite Joints with Different Reinforcement Elements at the Bolt Hole}, series = {4th Applied Research Conference, 5th July 2014, Ingolstadt}, booktitle = {4th Applied Research Conference, 5th July 2014, Ingolstadt}, editor = {Ziemann, Olaf and Mottok, J{\"u}rgen and Pforr, Johannes}, publisher = {Shaker}, pages = {255 -- 258}, language = {en} } @inproceedings{FritzSchmidEhrlich, author = {Fritz, B. and Schmid, Vinzent and Ehrlich, Ingo}, title = {Analytical and numerical shear stress analysis of adhesive structural bonded joints under tension load}, series = {Applied Research Conference 2014 - ARC 2014, 5th July 2014, Ingolstadt}, booktitle = {Applied Research Conference 2014 - ARC 2014, 5th July 2014, Ingolstadt}, editor = {Ziemann, Olaf and Mottok, J{\"u}rgen and Pforr, Johannes}, publisher = {Shaker}, address = {Aachen}, pages = {266 -- 271}, language = {de} } @inproceedings{BaumerKastenmeierEhrlich, author = {Baumer, A. and Kastenmeier, Andreas and Ehrlich, Ingo}, title = {A Numerical Study of Reinforced Bolted Composite Joints}, series = {Applied Research Conference 2015: ARC 2015 - N{\"u}rnberg, 3rd July 2015}, booktitle = {Applied Research Conference 2015: ARC 2015 - N{\"u}rnberg, 3rd July 2015}, editor = {Mottok, J{\"u}rgen and Reichenberger, Marcus and Scharfenberg, J. and Ziemann, Olaf}, publisher = {Book-on-demand-Verlag}, pages = {278 -- 282}, language = {en} } @inproceedings{WaetzigSchmidEhrlich, author = {W{\"a}tzig, A. and Schmid, Vinzent and Ehrlich, Ingo}, title = {Damage Modelling of Adhesive Joints Using the Cohesive Zone Model}, series = {Applied Research Conference 2016 - ARC 2016, Augsburg, 24 June 2016}, booktitle = {Applied Research Conference 2016 - ARC 2016, Augsburg, 24 June 2016}, editor = {Mottok, J{\"u}rgen and Reichenberger, Marcus and Stolle, Reinhard}, publisher = {Pro Business Verlag}, address = {Berlin}, language = {en} } @inproceedings{DinnebierEhrlich, author = {Dinnebier, Heinrich and Ehrlich, Ingo}, title = {The Effects of Severe Temperature Changes and High Humidity on Porous CFRP}, series = {Proceedings of the 15th International Materials Symposium (IMSP´2014), Pamukkale University (Denizli, Turkey), 15./17. October 2014}, booktitle = {Proceedings of the 15th International Materials Symposium (IMSP´2014), Pamukkale University (Denizli, Turkey), 15./17. October 2014}, editor = {Meran, C.}, pages = {433 -- 440}, abstract = {Purpose: A route to manufacture porous carbon fiber reinforced plastic (CFRP) for study purposes is described. Design/methodology/approach: The porous CFRP is characterized using standard techniques such as matrix digestion as well as the more sophisticated method of high resolution Microfocus X-Ray Tomography (μCT). A comparison of the results of those methods is presented. The mass gains of specimens with a wide range of porosity have been measured both in constant humidity and in alternating environments. Findings: It could be shown that severe temperature changes can temporarily increase the moisture content of porous CFRP. However, after the return to a constant environment, the moisture content returns back to saturation levels. Furthermore, it could be shown by X-Ray Tomography that even under severe climatic conditions no permanent liquid water condensates inside the pores. Research limitations/implications: Using Microfocus Computed Tomography it could be shown that even after nearly a year under hot-wet conditions and more than 150 severe temperature cycles there is no liquid water detectable inside the pores. Originality/value: In this paper the effects of severe temperature changes and high humidity on porous CFRP.}, language = {en} } @inproceedings{EhrlichDinnebierJost, author = {Ehrlich, Ingo and Dinnebier, Heinrich and Jost, C.}, title = {Comparison of Impact Delaminations in CFRP Using Ultrasonic Testing, Microfocus Computed X-Ray Tomography and Micrographic Cross-Section}, series = {Proceeding of the 15th International Materials Symposium (IMSP´2014), Pamukkale University (Denizli, Turkey), 15./17. October 2014}, booktitle = {Proceeding of the 15th International Materials Symposium (IMSP´2014), Pamukkale University (Denizli, Turkey), 15./17. October 2014}, editor = {Meran, C.}, pages = {441 -- 450}, language = {en} } @inproceedings{Wenzl, author = {Wenzl, C.}, title = {Comparison of Analytical and Numerical Results for the Deformation of Circular Curved Structures under Pressure Load}, series = {Applied Research Conference 2018 - ARC 2018, 10 July 2018 Deggendorf}, booktitle = {Applied Research Conference 2018 - ARC 2018, 10 July 2018 Deggendorf}, editor = {Mottok, J{\"u}rgen and Reichenberger, Marcus and Bogner, Werner}, publisher = {Pro Business GmbH}, address = {Berlin}, isbn = {978-3-96409-018-8}, pages = {150 -- 155}, language = {en} } @inproceedings{FaberKastenmeierEhrlich, author = {Faber, M. and Kastenmeier, Andreas and Ehrlich, Ingo}, title = {Three-dimensional finite element analysis of a composite tube with multi-row bolted joints}, series = {Applied Research Conference 2016 - ARC 2016, Augsburg, 24 June 2016}, booktitle = {Applied Research Conference 2016 - ARC 2016, Augsburg, 24 June 2016}, editor = {Mottok, J{\"u}rgen and Reichenberger, Marcus and Stolle, Reinhard}, publisher = {Pro Business Verlag}, address = {Berlin}, language = {de} }