Fracture toughness analysis by the material configurational forces in transformable materials

Abstract eng:
In the present paper, the crack-tip shielding from the residual strains which develop following transformable particles dispersed near the crack tip is estimated from the reduction of the crack tip J—integral associated with the material configurational forces. Numerical results show that the crack-tip shielding is dependent of the location and size of particles, and the radio of shear strain transformation and dilatant transformation. Moreover, the crack deflection angle in inhomogenous materials induced by the phase transformation can be claimed that the crack initiates along the direction which the potential energy release rate possesses a stationary (maximum) value in terms of the crack tip Jk- integral. The results show a significant non-symmetric stress distribution locally at the crack tip, causing the crack to deflect.

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