非线性电磁超声对铝合金拉伸变形评价研究

发布时间：2018-02-06 00:20

本文关键词： 非线性系数铝合金材料洛伦兹力拉伸变形拉伸载荷特征参量耦合剂弹性波非线性理论二次谐波 　出处：《声学学报》2017年01期 　论文类型：期刊论文

【摘要】：非线性系数是描述材料中微纳尺度损伤的特征参量,非线性系数常通过接触式压电超声进行检测,但耦合剂引起的非线性一般是未知的,针对这一问题,提出了一种非接触式电磁超声非线性纵波检测方法。该方法基于洛伦兹力机理在试件表面产生的振动弹性波,利用不同拉伸载荷下所制备的损伤试件,分别利用压电超声、电磁超声进行非线性超声系数测量。实验结果表明:利用两种非线性超声检测的相对非线性系数与铝合金的拉伸形变呈单调关系,同时也论证了电磁超声纵波基于非线性理论对塑性变形评估的可行性。
[Abstract]:Nonlinear coefficient is the characteristic parameter to describe the damage of micro-nano scale in materials. The nonlinear coefficient is usually detected by contact piezoelectric ultrasonic, but the nonlinear caused by coupling agent is unknown, aiming at this problem. A non-contact electromagnetic ultrasonic nonlinear longitudinal wave detection method is proposed, which is based on the vibration elastic wave generated by Lorentz force mechanism on the surface of the specimen. The damage specimen is prepared under different tensile loads. The experimental results show that the relative nonlinear coefficient measured by two kinds of nonlinear ultrasound is monotone with the tensile deformation of aluminum alloy. At the same time, the feasibility of electromagnetic ultrasonic longitudinal wave on plastic deformation evaluation based on nonlinear theory is also demonstrated.
【作者单位】：河北工业大学电磁场与电器可靠性省部共建重点实验室;华东交通大学电气与自动化工程学院;天津工业大学电工电能新技术天津市重点实验室;
【基金】：国家自然科学基金项目(51077036,51207105,51307043) 河北省自然科学基金项目(E2016202260) 天津市自然科学基金项目(16JCYBJC19000)资助
【分类号】：TG115.28;TG146.21

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