摘要
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．
Propagation behavior of fatigue crack perpendicular to the bimetallic laminates interface was experimentally investigated under four points bending condition. The laminates are composed of the materials with same elastic modulus and different yield strengths. It is generally demonstrated that the material mismatch in yield strength either promotes the crack growth as crack advances to the interface from higher strength material side or retards it as crack grows to the interface from lower strength material side. The crack, however, is always subjected to the interface shielding for both cases above, whereas the dominated range depends on the material side from which the crack starts to propagate. The crack could penetrate into the next, layer by passing through the interface whatever crack approaches to the interface from either the high or low yield strength side as long as the load is high enough. The effect of specimen geometry and the related tau stress on crack growth near to the interface is also discussed.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第10期1053-1058,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金 59871036
59925104以及59731020
关键词
金属层合板
强度错配
疲劳裂纹扩展
bimetallic laminate
strength mismatch
fatigue crack growth
