A mesomechanical model of fatigue crack initiation and growth with application to the low-cycle fatigue life prediction of the cast magnesium alloy AZ91

被引：0
|
作者：
Hong-Zhi, D [1 ]
Eisenmeier, G [1 ]
Mughrabi, H [1 ]
机构：
[1] Univ Erlangen Nurnberg, Inst Werkstoffwissensch, D-91058 Erlangen, Germany
来源：
FATIGUE 2000: FATIGUE & DURABILITY ASSESSMENT OF MATERIALS, COMP ONENTS AND STRUCTURES | 2000年
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D O I：
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中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A mesomechanical model of fatigue crack initiation and growth has been proposed and applied to predict the low-cycle fatigue life of the cast magnesium alloy AZ91. By using the concept and methods of both mesodamage mechanics and fractal theory, the physical mechanisms of fatigue crack formation and the structure of fatigue cracks are taken into account in the determination of the total fatigue life. The empirical Manson-Coffin law is derived from the standpoint of both fatigue crack initiation and fatigue crack propagation behaviour. The Manson-Coffin exponent is shown to be a material property and is physically equal to the value of the fractal dimension of one-dimensional slip lines. The predicted total fatigue lives are in good agreement with experimental results.
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页码：209 / 217
页数：9
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