This study characterized 345 MPa normal-strength steel (NSS) and 460 MPa high-strength steel (HSS) with the acoustic emission (AE) technique. Pencil lead break (PLB) and tensile tests were performed, and the generated AE signals were recorded. The AE signals from the PLB tests were converted into the frequency and time-frequency domains via a fast Fourier transform (FFT) and wavelet transform. The AE signals generated during the tensile process were divided into four stages for analysis. The AE parameters, such as the counts, amplitude, hit and duration, were extracted from the signals. An FFT was conducted to obtain the features of frequency spectrum at each stage. The comparisons revealed the similarities and differences in the AE characteristics between the two steels. It was found that the energy of the AE signals for the 460 MPa HSS was less overall than that of the 345 MPa NSS. The analysis results indicated that the AE technique is a method that can potentially be used to distinguish the two steels, and additional studies for accurate identification are needed. As 460 MPa HSS is being widely used but related AE studies are limited, this study provides data for additional investigations of the damage in HSS structures with the AE method.

这项研究利用声发射（AE）技术表征了345 MPa的普通强度钢（NSS）和460 MPa的高强度钢（HSS）。进行铅笔芯断裂（PLB）和拉伸试验，并记录产生的AE信号。通过快速傅里叶变换（FFT）和小波变换，将来自PLB测试的AE信号转换为频域和时频域。在拉伸过程中产生的AE信号分为四个阶段进行分析。从信号中提取了AE参数，例如计数，振幅，命中和持续时间。进行FFT以获得每个阶段的频谱特征。比较显示了两种钢的AE特性的异同。结果发现，460 MPa HSS的AE信号能量总体上小于345 MPa NSS的AE信号能量。分析结果表明，AE技术是一种可用于区分两种钢的方法，需要进行其他研究以进行准确识别。由于460 MPa HSS被广泛使用，但相关的AE研究受到限制，该研究为使用AE方法对HSS结构中的损伤进行进一步研究提供了数据。