高桦
,
曹卫杰
,
周德岐
,
王锐臻
金属学报
本文用单轴拉伸中心斜裂纹平板试样对18-8不锈钢/42％MgCl_2(沸)进行了一系列复合型应力腐蚀试验。结果表明,复合型加载条件下,应力腐蚀开裂方向与裂端最大正应力面方向一致;但是应力腐蚀裂纹起始扩展的临界抗力却随K_Ⅱ/K_Ⅰ值增大而降低。根据阳极溶解型应力腐蚀的“滑移 溶解”机制,本文从复合型加载比对裂端应力状态及塑性变形程度的影响就上述结果进行了讨论,并指出:在断裂分析中简单地使用Ⅰ型测试结果,并把复合型裂纹当作Ⅰ型裂纹处理是不安全的。
关键词:
18-8不锈钢
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stress corrosion
,
mixed mode
崔浩
,
李玉龙
,
刘元镛
,
郭嘉平
,
许秋莲
复合材料学报
建立了Ⅰ型与Ⅱ型失效模式耦合的粘聚单元本构模型,并通过模拟双悬臂梁实验进行了验证.将粘聚单元插入填充区任何2个实体单元之间,预测填充区的随机裂纹,模拟了接头在拉伸载荷下的失效.计算了复合材料基体、界面胶膜、填充物3者不同强度、填充区半径、填充物刚度等多种情况下接头的拉伸失效.计算结果表明:复合材料基体、界面胶膜、填充物3者的强度显著影响接头的承载能力与失效模式;随着填充区半径增大,结构承载能力也随之提高.试验结果验证了模拟结果.
关键词:
层合板
,
分层
,
粘聚区模型
,
混合模式
,
随机裂纹
GAO Hua CAO Weijie ZHOU Deqi WANG Ruizhen Shanghai University of Engineering Science
,
Shanghai
,
China
金属学报(英文版)
A series of mixed mode tests were carried out on 18-8 stainless steel in boiling 42% MgCl_2 solution.The results show that for any K_Ⅱ/K_Ⅰ ratio,the SCC direction coin- cides well with the crack tip maximum normal stress plane,while the SCC resistance of the material reduces as the ratio of K_Ⅱ/K_Ⅰ increases.The experimental results were discussed in the light of anode dissolving mechanism and the effect of mixed mode loading on crack tip stress and strain.It is concluded that for fracture analysis if mixed mode cracks were simply taken into account as mode Ⅰ cracks,and only mode Ⅰ testing results as mode Ⅰ fracture criter- ion were employed,it may not be safe.
关键词:
18-8 stainless steel
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null
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null
