Strain aging significantly influences the behavior of partially damaged structural steel. The effects of strain aging can be determined based on mechanical experiments, but the sampling process causes further damage to the structures. To explore the possibility of using nondestructive testing (NDT) technology to distinguish the strain aging effects on steel materials, this study investigates the characteristics of acoustic emission (AE) signals for high-strength steel (HSS) affected by strain aging. First, different strain aging effects were applied to 460 MPa HSS specimens. Second, pencil lead break (PLB) tests were performed on the specimens with strain aging, and the generated AE signals were recorded. Finally, tensile tests were conducted, that the strain aging effects on mechanical behavior were determined. The obtained AE signals were compared by extracting the AE parameters and analyzed in the frequency and time-frequency domains with a fast Fourier transform (FFT) and a wavelet transform (WT), respectively. The study shows that the strain aging effects change the characteristics of the AE signals. Compared to the prestrain, the aging time has a more pronounced impact on the AE behaviors. This research proposes a possible NDT method to determine the effects of strain aging on steel materials. Experimental data are provided to detect the degree of partial damage to 460 MPa HSS owing to strain aging using the AE method.

中文翻译：

---

声发射法研究应变时效影响460MPa高强钢的可行性

应变时效显着影响部分损坏结构钢的行为。应变时效的影响可以基于力学实验来确定，但采样过程会对结构造成进一步的损坏。为了探索使用无损检测 (NDT) 技术区分应变时效对钢材的影响的可能性，本研究调查了受应变时效影响的高强度钢 (HSS) 的声发射 (AE) 信号特征。首先，对 460 MPa HSS 试样施加不同的应变时效效应。其次，对经过应变时效的试样进行铅笔芯断裂 (PLB) 测试，并记录产生的 AE 信号。最后，进行拉伸试验，确定应变时效对力学行为的影响。通过提取 AE 参数来比较获得的 AE 信号，并分别使用快速傅立叶变换 (FFT) 和小波变换 (WT) 在频域和时频域中进行分析。研究表明，应变时效效应改变了 AE 信号的特性。与预应变相比，老化时间对 AE 行为的影响更为明显。本研究提出了一种可能的无损检测方法来确定应变时效对钢材的影响。提供了实验数据，以使用 AE 方法检测 460 MPa HSS 因应变时效引起的部分损坏程度。研究表明，应变时效效应改变了 AE 信号的特性。与预应变相比，老化时间对 AE 行为的影响更为明显。本研究提出了一种可能的无损检测方法来确定应变时效对钢材的影响。提供了实验数据，以使用 AE 方法检测 460 MPa HSS 因应变时效引起的部分损坏程度。研究表明，应变时效效应改变了 AE 信号的特性。与预应变相比，老化时间对 AE 行为的影响更为明显。本研究提出了一种可能的无损检测方法来确定应变时效对钢材的影响。提供了实验数据，以使用 AE 方法检测 460 MPa HSS 因应变时效引起的部分损坏程度。