Co-Authors:
Rosen, B.W.
Kulkami, S.V.
McLaughlin Jr., P.V.
Abstract:
The failure mechanisms in fiber-reinforced materials for monotomic and cyclic loading are examined. The importance and the need for observing failure in composites at the micro-level is demonstrated. This is primarily because of their inherent heterogeneity and anisotropy, resulting in multiple planes of weakness and microcrack growth. Initially, failure in unnotched unidirectional composite laminates is briefly reviewed for tension, compression, shear, transverse normal, and combined loadings. Emphasis is placed on the modes of failure at a microscale at which the constituents are discernible. The macroresponse is predicted by the unstable growth of these micro-imperfections. Subsequently, the anomalous hole size effect in composite laminates is analytically confirmed by employing a shear-lag analysis which considers the fiber and matrix phases separately. The shear-lag analysis is extended to model a composite laminate with through-the-thickness notches. The resulting quasi-heterogeneous model has built-in features like the capability to predict transverse and axil (stable as well as unstable) crack propagation, and the consideration of ″damage zones″ representing plane stress and shear strain concentrations at the notch tip.
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מונוכרום
הדגשת קישורים
חסימת אנימציה
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