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首页> 外文会议>International conference on fracture >In-situ Observation of Mixed Mode Fatigue Crack Growth Behavior in Heat Affected Zone of a Welded Joint
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In-situ Observation of Mixed Mode Fatigue Crack Growth Behavior in Heat Affected Zone of a Welded Joint

机译：焊接接头热影响区混合模式疲劳裂纹扩展行为的原位观察

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In-situ scanning electron microscope (SEM) observations of fatigue crack growth behavior in heat affected zone (HAZ) of a welded joint were performed with CTS (Compact-Tension-Shear) specimens under mixed-mode loading conditions in vacuum.Results showed that mode I fatigue behavior in the HAZ was influenced by local microstructure anisotropy and the ‘zigzag' mode crack profile tended to deviate into the lower strength weld metal.With increasing the mixity of mode I/II loadings,fatigue crack growth rate was decreased with significant crack branching.Shear and branch cracks were competitive along the crack path,and fatigue cracks were often initiated from grain boundary and the interface of lath martensites.The cracks tended to orient themselves into a pure mode I condition.Three existing models were discussed with respect to their capabilities to predict crack direction under various loading conditions.
机译：在真空模式下，采用CTS（紧凑型拉伸剪切）样品对复合材料的热影响区（HAZ）的疲劳裂纹扩展行为进行了原位扫描电子显微镜（SEM）观察。热影响区的I型疲劳行为受到局部微观结构各向异性的影响，“ Z字形”模式的裂纹轮廓倾向于偏向低强度的焊接金属。裂纹和分支裂纹沿裂纹路径具有竞争性，疲劳裂纹通常从晶界和板条马氏体的界面产生。裂纹趋向于以纯I态取向。关于三种现有模型，我们分别进行了讨论。可以预测各种载荷条件下的裂纹方向。

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