Abstract This research uses nonlinear Rayleigh waves to examine different levels of plastic strain in samples made from legacy X52 pipeline material. Here the plastic strain is used as a surrogate for the damage associated with a pipeline dent. Tension specimens are subjected to a static, mechanical load. Nonlinear Rayleigh waves are used to measure the relative acoustic nonlinearity parameter, β ′ in these specimens as a function of the accumulated plastic strain in the specimens. These results are then compared to previous β ′ measurements made in A36 steel specimens, and a scenario based on the formation of dislocations is proposed to explain the increase in β ′ observed. These measurements demonstrate the sensitivity of β ′ to the microstructural changes caused by plastic deformation in X52 pipeline steel.

中文翻译：

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用于评估 X52 管道材料塑性损伤的非线性瑞利波

摘要 本研究使用非线性瑞利波来检查由传统 X52 管道材料制成的样品中不同水平的塑性应变。此处，塑性应变用作与管道凹痕相关的损坏的替代。拉伸试样承受静态机械载荷。非线性瑞利波用于测量这些试样中的相对声学非线性参数 β ' 作为试样中累积塑性应变的函数。然后将这些结果与之前在 A36 钢试样中进行的 β ' 测量进行比较，并提出了一种基于位错形成的方案来解释观察到的 β ' 的增加。这些测量证明了 β ' 对 X52 管线钢塑性变形引起的微观结构变化的敏感性。