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OALib Journal期刊
ISSN: 2333-9721
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强度错配双层金属板垂直界面裂纹疲劳扩展行为
, PP. 1053-1058
Keywords: 金属层合板,强度错配,疲劳裂纹扩展
Abstract:
采用四点弯曲试样对爆炸焊接奥氏体不锈钢/低碳锅炉钢(1Cr18Ni9Ti/20G)层合板垂直界面裂纹的疲劳扩展行为进行了研究.结果表明由于强度错配,裂纹起始于高强度材料一侧时其疲劳扩展速率提高,而起始于低强度材料一侧时其疲劳扩展速率降低;但当裂纹尖端接近界面时,界面的存在对于上述两种情况下疲劳裂纹的扩展均起到了一定的屏蔽减速作用,只是其屏蔽效应的作用范围有所不同;在不发生偏折分叉的情况下,不论裂纹起始于层合板的哪一侧,只要外加载荷足够大,裂纹均能穿过界面.同时,对于试样尺寸及其导致的裂尖应力τ对于裂纹的扩展路径和在界面处行为的影响也进行了讨论和分析.
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