Abstract
This paper presents a statistical analysis for the tensile first failure and hybrid effect (which is part of the synergistic effect) of unidirectional interply hybrid composites. A shear-lag model is applied to solve the stress redistributions after the breakage of low-elongation fibers. By applying the random critical core model, the probabilistic first failure strain of hybrids is evaluated first, and the hybrid effect for strains is consequently evaluated. Reduction of the stress concentration factor and ineffective length of the low-elongation fibers in hybrids and differences between microdamage mechanisms in hybrids and single fiber composites provide a theoretical explanation of the hybrid effect. The present theoretical results show reasonable agreement with the existing experimental results.
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