ch7-processzone

ch7-processzone - Fracture Process Zone -1 Crack is the...

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Fracture Process Zone -1 Crack is the material separation with separation distance substantially smaller than the separation length, the crack length. Separation distance is comparable to some microstructural length dimension, ex. Distance between inhomogeneities or inclusions This distance can be as low as a few atomic distance while the crack length is considerable larger. The length scales involved are typically smaller than the characteristic length scale of the material, e.g. grain sizes The cracks at these length scales are called micro-cracks, and material separates at micro level and indicates micro separation. Separation distance Separation Length Body under study crack Refernce: Cracks and Fracture by K. B. Broberg
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Fracture Process Zone -2 The fracture process always takes place in a small region near the edge of the crack and is the process zone where the material separation occurs. While continuum theories are valid in other region, the theory is not valid in the process zone. Micromechanistic processes occurring in the process zone vary from material to material; even for the same material they vary under different temperatures and rates of loading Micro separation is the decohesion on a microstructural level. They can be classified as
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ch7-processzone - Fracture Process Zone -1 Crack is the...

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