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Fatigue damage evaluation in A36 steel using nonlinear Rayleigh surface waves

机译：利用非线性瑞利面波评估A36钢的疲劳损伤

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摘要

This research uses nonlinear Rayleigh waves to characterize the damage due to plastic deformation in A36 steel specimens subjected to quasi-static, monotonic tension, and low cycle fatigue. A36 steel is widely used in the civil infrastructure, such as steel bridges, where fatigue damage can lead to a catastrophic failure. Plastic deformation causes the generation of higher order harmonics in an initially monochromatic Rayleigh wave signal, and this measurable change occurs before macroscopic damage such as cracks appear in a specimen. This increase in the acoustic nonlinearity is produced by plasticity-induced microstructure changes, and thus can be taken as a direct measure of damage. Experiments are conducted using a pair of wedge transducers to generate and detect tone burst ultrasonic Rayleigh surface wave signals. The amplitudes of the first and second order harmonics are measured at different propagation distances to obtain the nonlinearity parameter for a given damage state throughout the fatigue life and monotonic loading process in three specimens. The results of the nonlinear ultrasonic measurements show an increase in the measured acoustic nonlinearity, especially in the early stages of fatigue life. In addition, there is a notably close relationship between the measured acoustic nonlinearity and the cumulative plastic deformation. These results demonstrate the feasibility of using nonlinear Rayleigh waves to characterize damage associated with plastic deformation, and this quantitative information can be a useful input for life prediction models.
机译：这项研究使用非线性瑞利波来表征A36钢试样在准静态，单调张力和低周疲劳下的塑性变形所造成的破坏。 A36钢被广泛用于民用基础设施中，例如钢桥，疲劳损坏可能会导致灾难性的故障。塑性变形会在最初的单色瑞利波信号中产生更高次的谐波，并且这种可测量的变化发生在宏观破坏（例如裂纹）出现在样品上之前。声学非线性的这种增加是由于塑性引起的微观结构变化而产生的，因此可以被视为直接的破坏度量。使用一对楔形换能器进行实验，以生成和检测音爆超声瑞利表面波信号。在不同的传播距离处测量一阶和二阶谐波的振幅，以获得三个样本在整个疲劳寿命和单调加载过程中给定损伤状态的非线性参数。非线性超声测量的结果表明，所测量的声学非线性有所增加，尤其是在疲劳寿命的早期阶段。此外，测得的声学非线性与累积塑性变形之间存在密切的关系。这些结果证明了使用非线性瑞利波来表征与塑性变形相关的损伤的可行性，并且该定量信息可以作为寿命预测模型的有用输入。

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  • 来源
    《NDT & E international》 |2012年第2012期|p.10-15|共6页
  • 作者

    Simon V. Walker; Jin-Yeon Kim; Jianmin Qu; Laurence J. Jacobs;

  • 作者单位

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;

    Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208, USA;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA,Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA,Georgia Institute of Technology, School of Civil and Environmental Engineering, MS 0355, Atlanta, GA 30332-0355, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nonlinear acoustics; fatigue damage; nonlinear rayleigh waves;

    机译：非线性声学疲劳损伤非线性瑞利波;

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