With the different loading ratio of parallel to axis and normal to axis direction , damage defects will occur bulking problem . by varying the degree of material anisotropy relative to the loading axis such as poisson ' s ratio and shear modulus , crack growth bulking strain value parallel to or normal to the loading axis is different . the parameters controlling the growth or arrest of the delamination damage are identified as the geometry and the depth of defects and radius of cylindrical etc . at last , it was investigated that the delamination damage is often induced by the tip of matrix damage under higher stress
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