Microbuckle initiation in fibre composites : A finite element study

摘要: A finite strain continuum theory is presented for unidirectional fibre reinforced composites under in-plane loading. The constitutive response expressed in terms of couple stress theory, and deduced from a unit cell linear elastic Timoshenko beam embedded non-linear elastic-plastic matrix. implemented within element framework used to analyse compressive failure polymer matrix by microbuckling. It assumed that microbuckling initiates an imperfection the form elliptical region waviness. calculations show strength decreases with increasing spatial size bifurcation value Rosen (1965, Fibre Composite Materials, pp. 37–75, American Society Metals Seminar) imperfection-sensitive infinite band given Fleck et al. [1995, J. Appl. Mech. 62, 329–337.].