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Nondestructive Estimation of Residual Stresses by Magnetoacoustoelasticity

通过磁声弹性无损估计残余应力

基本信息

批准号：
02650071
负责人：
MATSUMOTO EIJI
金额：
$ 1.28万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

The summary of the research in the term is the followings.1. We analyzed the magnetic anisotropy, induced by working such as rolling, of ferromagnetic materials like steel which are widely used as structural materials. It is shown that there is a possibility that higher order anisotropy is generated due to the nonlinearity in the magnetization curve, even in the case of rolling plates with orthotropic magnetic symmetry. The prediction is verified by the plane magnetization experiment of a carbon steel plate.2. For acoustoelastic stress estimation on ferromagnetic materials under the strong magnetic field, we considered the influences of the magnetic field on the propagation of ultrasonic waves. For soft ferromagnetic materials without magnetic hysteresis, we showed that a complicated relation between the magnetic field and the speed of the ultrasonic wave is well explained by a generalized theory of the conventional continuum model of magnetoelastic materials.3. For the purpose of more practical nondestructive measurements under the strong magnetic field, we studied the influences of the magnetic hysteresis on the propagation of ultrasonic waves. In a result, it is shown that from the magnetic hysteresis and the magnetoelastic effect, there occurs a hysteresis in the speed and the acoustoelastic constants with respect to the change of the magnetic field. The theoretical result is verified by the acoustoelastic experiment on low-carbon steel under a magnetic field.4. It is found that the distortion of the wave form and the attenuation of the wave are induced by the magnetic hysteresis and the magnetoelastic couplings. The development of a new technique utilizing the effect by wave form analysis for stress estimation is left as a future subject.

本学期的研究工作总结如下：1.分析了钢铁等铁磁材料在轧制等加工过程中产生的磁各向异性，并对这些材料的磁性能进行了研究。它表明，有可能产生高阶各向异性由于磁化曲线的非线性，即使在轧制板正交各向异性磁对称的情况下。通过碳钢板的平面磁化实验验证了预测结果.针对强磁场作用下铁磁材料的声弹性应力估计问题，考虑了磁场对超声波传播的影响。对于没有磁滞的软铁磁材料，我们证明了磁场和超声波速度之间的复杂关系可以用磁弹性材料的传统连续介质模型的广义理论很好地解释.为了在强磁场下进行更实用的无损检测，我们研究了磁滞对超声波传播的影响。结果表明，从磁滞和磁弹性效应来看，相对于磁场的变化，速度和声弹性常数存在滞后。低碳钢在磁场作用下的声弹性实验验证了理论分析的正确性.结果表明，磁滞效应和磁弹性耦合作用会引起波形的畸变和衰减。开发利用波形分析的效果进行应力估计的新技术是未来的课题。