铝合金拉伸塑性变形的非线性电磁超声检测

doi:10.19595/j.cnki.1000-6753.tces.190881

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摘要针对金属构件早期塑性损伤检测的难点问题,建立非线性电磁超声表面波弹塑性模型,通过改变材料内部塑性应变大小模拟不同程度的塑性损伤,研究应力应变、塑性损伤、超声非线性系数三者之间的关系,并利用非线性电磁超声实验方法,对拉伸变形的试件进行塑性损伤评估。搭建了非线性电磁超声表面波检测系统,对导入不同塑性变形的试件进行相对非线性系数的检测。实验结果表明,在材料屈服硬化阶段早期（$\varepsilon \le 5\%$）,随着被测试件中导入塑性应变量的增加,相对非线性系数迅速增大;在材料屈服硬化阶段后期（$5\% < \varepsilon \le 7\%$）,随塑性损伤程度的增加,相对非线性系数增幅逐渐趋于平缓;在材料出现颈缩时（$\varepsilon >7\%$）,材料内部应力的降低导致相对非线性系数出现明显下降。据此,可以对塑性损伤的变化情况进行有效监测,并进一步评估材料的力学寿命。

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	刘素贞
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关键词 ：非线性电磁超声, 塑性应变, 非线性系数, 力学寿命

Abstract：Aiming at the difficulty of early plastic damage detection of metal components, elastoplastic model of nonlinear electromagnetic acoustic surface wave was established. By changing the plastic strain inside the material to simulate different degrees of plastic damage, the relationship among the stress-strain, plastic damage and acoustic nonlinear parameters was studied. The plastic damage evaluation of the specimens subjected to tensile deformation were carried out based on the method of nonlinear electromagnetic acoustic experiment. The nonlinear electromagnetic acoustic surface wave detection system was built, the relative nonlinear parameters of the specimens with different plastic deformation were measured. The experimental results show that in the early stage of material yield hardening（$\varepsilon \le 5\%$）, the relative nonlinear parameters increases rapidly with the increase of plastic strain introduced into the tested specimen. In the later stage of material yield hardening（$5\% < \varepsilon \le 7$）, the relative nonlinear parameters increases slowly with the increase of plastic damage degree. When the material necking occurs（$\varepsilon >7\%$）, the reduction of material internal stress results in a significant decrease of relative nonlinear parameters. Accordingly, the change of plastic damage can be effectively monitored, and the mechanical life of materials can be further evaluated.

Key words： Nonlinear electromagnetic acoustic plastic strain nonlinear parameters mechanical life

收稿日期: 2019-07-17

PACS:

TB551

基金资助:

国家自然科学基金（51777052, 51977058）、河北省自然科学基金（E2017202055）、河北省高校重点项目（ZD2018214）和省部共建电工装备可靠性与智能化国家重点实验室自主研究课题（ERIZZ2018002）资助

通讯作者: 刘素贞女,1969 年生,博士,教授,博士生导师,研究方向为工程电磁场与磁技术。E-mail：szliu@hebut.edu.cn

作者简介: 田钰霖男,1994年生,硕士研究生,研究方向为电磁无损检测技术。E-mail：1025639876@qq.com

引用本文:

刘素贞, 田钰霖, 张闯, 金亮, 杨庆新. 铝合金拉伸塑性变形的非线性电磁超声检测[J]. 电工技术学报, 2020, 35(15): 3153-3160. Liu Suzhen, Tian Yulin, Zhang Chuang, Jin Liang, Yang Qingxin. Nonlinear Electromagnetic Acoustic Detection of Aluminum Alloys with Tensile Plastic Deformation. Transactions of China Electrotechnical Society, 2020, 35(15): 3153-3160.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.190881 https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I15/3153

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