WANG Xi-shu, Kawagoishi Horio, YU Shou-wen. EVALUATION OF SMALL CRACK GROWTH RATE OF ALUMINUM ALLOYS UNDER DIFFERENT STRESS GRADIENTS[J]. Engineering Mechanics, 1999, 16(1): 1-8.
Citation: WANG Xi-shu, Kawagoishi Horio, YU Shou-wen. EVALUATION OF SMALL CRACK GROWTH RATE OF ALUMINUM ALLOYS UNDER DIFFERENT STRESS GRADIENTS[J]. Engineering Mechanics, 1999, 16(1): 1-8.

EVALUATION OF SMALL CRACK GROWTH RATE OF ALUMINUM ALLOYS UNDER DIFFERENT STRESS GRADIENTS

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  • Received Date: September 30, 1997
  • Revised Date: December 31, 1899
  • The conventional method for the evaluation of small crack growth rate in both anannealed and an age-hardened aluminum alloy is investigated under a high nominal stress level.The small crack growth rate can be expressed as de / dN = ne (σ:the nominal stressamplitude, e: crack length) for different types of loading and materials, the constants C and n differ in these conditions. However, the crack growth rate in both cases can generally beexpressed as de / dN=C1ερn1e( ερ: the plastic strain amplitude), where C' and n' are constant inboth types of loading. Consequently, fatigue lives in both mpes of loading can be predicted usingthe former expression, and the cyclic stress-strain curve in each type of loading.
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