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A FRACTURE MODEL FOR CORROSION FATIGUE CRACK PROPAGATION PROCESS |
WANG Rong(Xi'an Petroleum Institute; Xi'an 710061) |
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Abstract Taking into simultaneous consideration of the modified static fracture model for fatigue crack propagation and the corrosion dissolution of the bare metal surface at a crack tip, a corrosion-bluntening-fracture model for corrosion fatigue crack propagation (CFCP) was proposed. According to the new model and linear elastic fracture mechanics, an expression for CFCP rate, which revealed the quantitative correlation among CFCP rate, stress intensity factor amplitude, the CFCP threshold, the corrosion rate of the bare metal at the crack tip, loading frequency and the critical fracture stress of the hypothetical material elements along the crack path, was derived. The expression could interpret the effect of hydrogen embrit-tlement on the CFCP process. The experimental results showed that the expression gave a good fit to the CFCP rates of two commercial aluminum alloys in 3.5% NaCl solution at loading frequency 10Hz.
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Received: 25 April 1998
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