Experimental characterization and constitutive modeling of the non-linear stress¿strain behavior of unidirectional carbon¿epoxy under high strain rate loading

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Koerber H. (Author) Other; Kuhn P. (Author) Other; Ploeckl M. (Author) Other; Otero F. (Author) Other; Gerbaud P. (Author) Other; Rolfes R. (Author) Other; Camanho, PP (Author) FEUP

Journal

Title: Advanced Modeling and Simulation in Engineering Sciences

Vol. 224

Publisher: Springer Nature

Indexing

Scopus - 35 Citations

Other information

Authenticus ID: P-00P-XMH

DOI: 10.1186/s40323-018-0111-x

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 113 to 300 s - 1. With the already available off-axis and transverse compression test data for IM7-8552, 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 developed by the authors (Vogler et al. in Mech Mater 59:50¿64, 2013). An invariant based failure criterion is added to the model to be able to predict the strength for a given orientation and strain rate accurately. The strain rate dependency of the elastic and ultimate strength properties is introduced in the model through scaling functions. A good correlation between the measured and numerically predicted stress¿strain response and failure of the specimens was achieved for all specimen types and both strain rate regimes.

Language: English

Type (Professor's evaluation): Scientific