刘彬,董世运,徐滨士,何鹏

• 1:哈尔滨工业大学先进焊接与连接国家重点实验室
• 2:装甲兵工程学院再制造技术重点实验室

摘要(Abstract)：

结合力学静载拉伸试验,采用声程固定的5 MHz的双瑞利波探头对电刷镀层应力进行评价。结果表明,随着拉伸应力的增加,瑞利波在电刷镀层中的传播速度呈线性规律增加,当拉伸应力达到104 MPa时,时间差达到最大值180 ns;再随拉伸应力的增加,瑞利波在电刷镀层中的传播速度呈"跳跃式"变化。采用超声显微成像方法对承受不同载荷的电刷镀层进行检测结果表明,微裂纹是造成电刷镀层应力-时间差呈"跳跃式"变化的主要原因。在分析镀层平整度及镀层变形程度对评价结果影响的基础上,得到可用于评价镀层应力的声弹性公式,验证结果表明采用该方法对镀层应力进行评价是可行的。

关键词(KeyWords)： 电刷镀层;瑞利波;拉伸应力;传播速度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(50975287)

作者(Author): 刘彬,董世运,徐滨士,何鹏

DOI: 10.13289/j.issn.1009-6264.2012.03.023

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