Modeling the effects of material non-linearity using moving window micromechanics

摘要: Abstract In the analysis of materials with random heterogeneous microstructure assumption is often made that material behavior can be represented by homogenized or effective properties. While this yields accurate results for bulk composite materials, it ignores effects microstructure. The spatial variations in these microstructures focus, initiate and propagate localized non-linear behavior, subsequent damage failure. previous work a computational method, moving window micromechanics (MW), was used to capture microstructural detail characterize variability local global elastic response. Digital images described micromechanical generate spatially varying property fields. strengths approach are fields consistently developed from digital real microstructures, they easy import into finite element models (FE) using regular grids, their statistical characterizations provide basis simulations further characterizing stochastic work, technique under plastic yielding; specifically yield stress hardening slope, post yield. complete set were input FE uniaxial loading. Global strain curves FE–MW model compared more traditional model, generalized method cells. Local produced which correlate well qualitatively captures inelastic based on flow rule, sample continuous fiber composites transverse