Published: Jan 1992
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A simple methodology is suggested to analyze the crack growth of a body up to maximum load, by integrating the step-like increments of applied load and crack extension. The crack-growth criterion is the critical rate of crack-tip opening displacement (CTOD) increase versus effective crack extension of plastic-zone-size adjustment. Formulations of linear elastic fracture mechanics and limit-load expressions are used in the calculation. The analysis also presents a K-resistance (KR) curve equation, which is complete with constants of fracture initiation toughness and crack-growth resistance. The proposed method is applied to 2024-T351 aluminum alloy specimens in plane stress, for which experimental data are available. The calculated maximum loads are in reasonable agreement with the failure loads.
fracture initiation, crack growth, resistance (, KR, ) curve, effective crack length, maximum load, fracture mechanics, 2024-T351 aluminum alloy
Associate professor, Chung-Ang University, Seoul,