Surface Chemical and Thermally Activated Processes in Fatigue Crack Initiation
Surface Chemical and Thermally Activated Processes in Fatigue Crack Initiation
批准号:
9001662
负责人:
Yip-Wah Chung
金额:
$36.45万
依托单位:
依托单位国家:
美国
项目类别:
Continuing Grant
财政年份:
1990
资助国家:
美国
项目状态:
已结题
起止时间:
1990-09-15 至 1995-03-31
中文摘要
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英文摘要
Several critical issues are examined related to fatigue crack initiation and microcrack growth. Included are the effects of subsurface environmental species on fatigue; the role of surface reactivity on fatigue life; theoretical analysis of the slip band spacing; and effects of material type. The significance of subsurface incorporation of environmental species on fatigue is determined by measuring fatigue crack initiation in selected gaseous environments (oxygen and other selected gases). The correlation between slip band spacing and fatigue life is examined to extend current theory on periodic slip band arrays and their influence on crack initiation.
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依托单位:
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