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Acta Metall Sin  1977, Vol. 13 Issue (z1): 57-153    DOI:
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ON THE CRITERION FOR CRACK EXTENSION
Chen Chih
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Chen Chih. ON THE CRITERION FOR CRACK EXTENSION. Acta Metall Sin, 1977, 13(z1): 57-153.

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Abstract  Based on the inevitable blunting of the crack-tip and the finiteness of stressand strain, it is shown that the basic criterion for crack extension is either themaximum shear stress criterion (for ductile fracture) or the maximum principalstress criterion (for cleavage fracture) after analyzing three series of experimentaldatum. Critical relations can be deduced under specific conditions. In the caseof plane strain and small scale yielding, this critical relation is just the well-known K_I=K_(Ic)=material constant; whereas, in the case of plane stress andsmall scale yielding, the critical relation deduced is K_c=(π/8kσ_Fε_F~2BE)~(1/2). Factorseffecting K_(Ic) were also discussed.
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