 
			 
			MCQOPTIONS
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				| 1. | According to Irwin s theory of crack resistance, the failure occurs when the rate of change of __________ release rate is equal to the rate of change of _______________ to the crack growth. | 
| A. | strain energy, resistance | 
| B. | resistance, plastic flow | 
| C. | plastic flow, strain energy | 
| D. | resistance, plastic flow | 
| Answer» B. resistance, plastic flow | |