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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

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

Revista

Título: Advanced Modeling and Simulation in Engineering Sciences

Vol. 224

Editora: Springer Nature

Indexação

Scopus - 35 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica