Struktursimulation Endlosfaserverbunde

The deformation and damage behavior of continuous-fiber composite components is largely determined by the structure of the reinforcing fibers. Fiber orientation, fiber volume content, and local effects such as waviness and gapping can vary significantly as a result of the forming process. To consider this in the prediction of the structural mechanical behavior, we incorporate the process information provided by the CAE chain in the structural simulation. For this purpose, we develop material models that capture the nonlinear deformation behavior and the damage evolution in a failure mode-specific manner (fiber fracture, matrix fracture, delamination) as a function of the local fiber structure.


Research focus
  • Virtual validation of composite components
  • Consideration of manufacturing effects
  • Nonlinear material modeling
  • Failure analysis, damage evolution
  • Dynamic analysis: vibration, damping, impact
  • Multiscale simulation



Research projects

Tel.: +49 721 608-45896
Email: constantin.krauss∂


Tel.: +49 721 608-45361
Email: felix.froelich∂


Tel.: +49 721 608-45386
Email: luise.kaerger∂




Struktursimulation einer Stirnwand: Materialauslastung ohne (oben) und mit (unten) Berücksichtigung von Umformeffekten
Mikrosimulation: Matrixschädigung bei vorliegender Faserwelligkeit

Selected publications in the research field

On the influence of low-velocity impact damage on constrained-layer damping in hybrid CFRP-elastomer-metal laminates
Jackstadt, A.; Liebig, W. V.; Weidenmann, K. A.; Kärger, L.
2024. Materials & Design, 241, Article no: 112882. doi:10.1016/j.matdes.2024.112882
Approaching Polycarbonate as an LFT-D Material: Processing and Mechanical Properties
Schelleis, C.; Scheuring, B. M.; Liebig, W. V.; Hrymak, A. N.; Henning, F.
2023. Polymers, 15 (9), 2041. doi:10.3390/polym15092041
Modeling structural behavior of fiber reinforced composite parts by considering draping effects. PhD dissertation
Galkin, S.
2022, April 14. Karlsruher Institut für Technologie (KIT). doi:10.5445/IR/1000144697
Material and particle size sensitivity analysis on coefficient of restitution in low-velocity normal impacts
Meyer, N.; Wagemann, E. L.; Jackstadt, A.; Seifried, R.
2022. Computational Particle Mechanics, 9 (6), 1293–1308. doi:10.1007/s40571-022-00471-z
Hybrid material additive manufacturing: interlocking interfaces for fused filament fabrication on laser powder bed fusion substrates
Englert, L.; Heuer, A.; Engelskirchen, M. K.; Frölich, F.; Dietrich, S.; Liebig, W. V.; Kärger, L.; Schulze, V.
2022. Virtual and Physical Prototyping, 17 (3), 508–527. doi:10.1080/17452759.2022.2048228
Analytical modeling and investigation of constrained layer damping in hybrid laminates based on a unified plate formulation
Jackstadt, A.; Liebig, W. V.; Kärger, L.
2022. International journal of mechanical sciences, 216 (216), Art.Nr.: 106964. doi:10.1016/j.ijmecsci.2021.106964
Modeling the Mullins effect of rubbers used in constrained‐layer damping applications
Jackstadt, A.; Frölich, F.; Weidenmann, K.; Kärger, L.
2021. Proceedings in applied mathematics and mechanics, 21 (1), e202100098. doi:10.1002/pamm.202100098
Wide Scale Characterization and Modeling of the Vibration and Damping Behavior of CFRP-Elastomer-Metal Laminates—Comparison and Discussion of Different Test Setups
Sessner, V.; Liebig, W. V.; Jackstadt, A.; Schmid, D.; Ehrig, T.; Holeczek, K.; Gräbner, N.; Kostka, P.; Wagner, U. von; Weidenmann, K. A.; Kärger, L.
2021. Applied composite materials, 28 (5), 1715–1746. doi:10.1007/s10443-021-09934-7
Extension of an analytical solution of a unified formulation to the frequency response of composite plates with viscoelastic layers
Jackstadt, A.; Kärger, L.
2021. Proceedings in applied mathematics and mechanics, 20 (1), Art.-Nr.: e202000234. doi:10.1002/pamm.202000234
Crack characterization of discontinuous fiber-reinforced composites by using micro-computed tomography: Cyclic in-situ testing, crack segmentation and crack volume fraction
Schöttl, L.; Kolb, P.; Liebig, W. V.; Weidenmann, K. A.; Inal, K.; Elsner, P.
2020. Composites communications, 21, Art. Nr.: 100384. doi:10.1016/j.coco.2020.100384
Application of a mixed variational higher order plate theory towards understanding the deformation behavior of hybrid laminates
Jackstadt, A.; Liebig, W. V.; Sessner, V.; Weidenmann, K. A.; Kärger, L.
2019. Proceedings in applied mathematics and mechanics, 19 (1), e201900048. doi:10.1002/pamm.201900048
Experimental and Numerical Determination of the Local Fiber Volume Content of Unidirectional Non-Crimp Fabrics with Forming Effects
Galkin, S.; Kunze, E.; Kärger, L.; Böhm, R.; Gude, M.
2019. Journal of composites science, 3 (1), Article: 19. doi:10.3390/jcs3010019
Frequency domain modelling of transversely isotropic viscoelastic fibre-reinforced plastics
Liebig, W. V.; Jackstadt, A.; Sessner, V.; Weidenmann, K. A.; Kärger, L.
2019. Composites science and technology, 180, 101–110. doi:10.1016/j.compscitech.2019.04.019
Damping Characterization of Hybrid Carbon Fiber Elastomer Metal Laminates using Experimental and Numerical Dynamic Mechanical Analysis
Sessner, V.; Jackstadt, A.; Liebig, W.; Kärger, L.; Weidenmann, K.
2019. Journal of composites science, 3 (1), 3. doi:10.3390/jcs3010003
Smart dispersion: Validation of OCT and impedance spectroscopy as solutions for in-situ dispersion analysis of CNP/EP-composites
Meeuw, H.; Körbelin, J.; Bernstorff, D. von; Augustin, T.; Liebig, W. V.; Fiedler, B.
2018. Materialia, 1, 185–197. doi:10.1016/j.mtla.2018.06.002
Numerical and experimental investigations of the damping behaviour of hybrid CFRP-elastomer-metal laminates
Liebig, W. V.; Sessner, V.; Weidenmann, K. A.; Kärger, L.
2018. Composite Structures, 202, 1109–1113. doi:10.1016/j.compstruct.2018.05.051
Comparison of analytical approaches predicting the compressive strength of fibre reinforced polymers
Leopold, C.; Harder, S.; Philipkowski, T.; Liebig, W. V.; Fiedler, B.
2018. Materials, 10 (12), Art. Nr.: 2517. doi:10.3390/ma11122517
Forming optimisation embedded in a CAE chain to assess and enhance the structural performance of composite components
Kärger, L.; Galkin, S.; Zimmerling, C.; Dörr, D.; Linden, J.; Oeckerath, A.; Wolf, K.
2018. Composite structures, 192, 143–152. doi:10.1016/j.compstruct.2018.02.041
Simplified phenomenological model of the nonlinear behavior of FRPs under combined stress states
Galkin, S.; Schirmaier, F. J.; Kärger, L.
2018. Journal of composite materials, 52 (4), 475–485. doi:10.1177/0021998317709332
Compression fracture of CFRP laminates containing stress intensifications
Leopold, C.; Schütt, M.; Liebig, W. V.; Philipkowski, T.; Kürten, J.; Schulte, K.; Fiedler, B.
2017. Materials, 10 (9), Art.Nr.: 1039. doi:10.3390/ma10091039
Influence of carbon nanoparticle modification on the mechanical and electrical properties of epoxy in small volumes
Leopold, C.; Augustin, T.; Schwebler, T.; Lehmann, J.; Liebig, W. V.; Fiedler, B.
2017. Journal of colloid and interface science, 506, 620–632. doi:10.1016/j.jcis.2017.07.085
Experimental and numerical analysis of bolt-loaded open-hole laminates reinforced by winded carbon rovings
Botzkowski, T.; Galkin, S.; Wagner, S.; Sikora, S. P.; Kärger, L.
2016. Composite structures, 141, 194–202. doi:10.1016/j.compstruct.2016.01.057
Development and validation of a CAE chain for unidirectional fibre reinforced composite components
Kärger, L.; Bernath, A.; Fritz, F.; Galkin, S.; Magagnato, D.; Oeckerath, A.; Schön, A.; Henning, F.
2015. Composite structures, 132, 350–358. doi:10.1016/j.compstruct.2015.05.047