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高频涡流加载下闭合裂纹的动态响应特性

, PP. 246-253

Keywords: 高频涡流加载,闭合裂纹,非线性超声,二次谐波

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Abstract:

闭合裂纹是金属材料疲劳损伤的早期表现形式之一,因其界面相互啮合且紧密接触使得传统电磁超声检测方法对于其检测效果并不理想。本文把非线性检测技术与电磁超声相结合,建立电磁换能机理产生的应力波与以非线性弹簧理论搭建的闭合裂纹响应过程的有限元模型,模拟高频涡流加载下电磁超声表面波传播过程中振动质点的位移分布及其幅频特性,通过分析二次谐波分量研究电磁超声表面波在含闭合裂纹金属铝板中的非线性传播特性,为电磁加载技术应用于闭合裂纹的超声非线性检测提供理论基础。

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