Modelling the effect of process-induced anisotropy on the constitutive behavior of chopped fiber composites. (October 2017)

• Record Type: Journal Article
• Authors: Feld, N.; Maeyens, C.; Delattre, B.; Grandmaison, N.
• Is Part Of: Composites. Volume 101(2017)
• Page Start: 334
• Page End: 343
• Publication Date: 2017-10
• Subjects: A. Discontinuous reinforcement -- B. Process-induced anisotropy -- C. Damage mechanics -- D. Mechanical testing; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2017.06.012
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: This study aims at understanding the influence of process-induced anisotropy on the mechanical behavior of chopped fiber composites up to the onset of failure. Due to the specific microstructure of these materials – neither laminates nor reinforced plastics – a new specimen geometry must be devised for their characterization. Experimental investigations coupled with full field analyses led to the definition of a geometry that avoids edge effects and minimizes strain heterogeneity along the free length. Specimens adopting this geometry were cut out of plates manufactured with a controlled process-induced anisotropy, in different directions. Monotonic and cycled loading paths were applied to these coupons and an elastic–plastic damageable behavior is observed, with little strain rate effects in quasi-statics. Both linear and nonlinear mechanisms display a significant anisotropy, which is found to evolve monotonously with process-induced strains. Simple scalar evolution laws for irreversible strains and loss of stiffness may nevertheless be identified.