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Griffith's theory of failure is based on the assumption that the low order
of tensile strength in common materials is due to the presence of small
cracks or flaws. Actual stresses may occur around these flaws, which are
of the order of magnitude of molecular cohesion values, while the average
tensile strength may be quite low. Mohr's theory predicts that failure of
materials is due to failure in shear, whereas Griffith's theory postulates
that it is due to failure at crack tips. Lewis
Source:
Dictionary of Mining, Mineral, and Related Terms
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