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V(f,z)分析方法在小尺寸材料弹性常数测量中的应用

Keywords: V(f,z)分析方法,弹性常数,线聚焦聚偏二氟乙烯探头,小尺寸材料

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Abstract:

针对小尺寸材料弹性常数的测量,提出了一种频域处理方法——V(f,z)分析方法.V(f,z)分析方法基于声学显微镜技术,使用线聚焦聚偏二氟乙烯(PVDF)探头,测定材料的表面波波速,计算材料的弹性常数.采用该分析方法对块体不锈钢试件的弹性常数进行了测量,测量结果与理论值相吻合.误差分析结果表明,V(f,z)分析方法具有较高的测量精度,泊松比和杨氏模量的测量误差均小于5%,能满足工程和科学研究的要求.此外,V(f,z)分析方法可测得不同频率的频散曲线,不仅适用于块体材料,而且适用于薄板、涂层等具有频散特性的材料,这为进一步测量薄板材料和涂层材料的弹性常数奠定了分析基础.

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