Constitutive modeling and experimental characterization of the non-linear stress-strain behavior of unidirectional carbon-epoxy under high strain rates

• Type: Article in International Conference Proceedings Book
• Date: 2015

Authors

Vogler, M (Author) Other; Koerber, H (Author) Other; Kuhn, P (Author) Other; Rolfes, R (Author) Other; Camanho, PP (Author) FEUP

Conference proceedings International

Title: ICCM International Conferences on Composite Materials

20th International Conference on Composite Materials, ICCM 2015

19 July 2015 through 24 July 2015

Indexing

Scopus - 2 Citations

Other information

Authenticus ID: P-00P-MEV

Abstract (EN): The mechanical response of IM7-8552 carbon epoxy was investigated for transverse tension and transverse tension / in-plane shear loadings at static and dynamic strain rates using transverse tension and off-axis tension specimens. The dynamic tests were carried out on a split-Hopkinson tension bar at axial strain rates from 113s-1 to 300s-1. With the already available off-axis and transverse compression test data for IM7-8552 presented in [1], a comprehensive data set is available now, which can be used for validation and calibration of numerical models. The measured axial stress-strain response was simulated using a fully 3D transversely isotropic elastic-viscoplastic constitutive model. The constitutive model represents a viscoplastic extension of the transversely-isotropic plasticity model presented in [2]. A generally quite good correlation between the measured and numerically predicted stress-strain response was achieved for all specimen types and both strain rate regimes. However, the results show the necessity to regard viscous effects in the elastic regime as well.

Language: English

Type (Professor's evaluation): Scientific