Acoustic Emission Response and Damage Process for Q235 Steel in an in Situ Tensile Test
Acoustic Emission Response and Damage Process for Q235 Steel in an in Situ Tensile Test
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Q235钢原位拉伸试验的声发射响应和损伤过程
DOI：
10.24425/aoa.2019.129735
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发表时间：
2019-11
影响因子：
0.9
通讯作者：
Liu Kang Lin
中科院分区：
文献类型：
--
作者：
Zhang Ying;Li Yue;Lai Huan Sheng;Bai Chunmei;Liu Kang Lin
Q235钢广泛应用于工程和建筑领域。因此，识别材料的损伤机理和声发射（AE）响应，以确保结构的安全性是非常重要的。本文采用声发射监测系统和光学显微镜原位拉伸试验，研究了Q235钢的声发射响应，并对损伤过程进行了深入的研究。为了提高显微照片的质量，在测试之前对试样的表面进行抛光和蚀刻。在试验过程中，声发射监测系统记录了两种声发射响应，即突发信号和连续信号。在原位试验的基础上，观察到Q235钢的损伤是由晶体滑移和夹杂物断裂引起的。由于晶体滑移是一个持续的过程，产生连续的声发射信号，而突发声发射信号可能是由于夹杂物破裂突然发生，释放出更高的能量。此外，在屈服阶段，还观察到大量的高幅值声发射信号，随后信号的数量和幅值都有所下降。
Q235 steel is widely used in engineering and construction. Therefore, it is important to identify the damage mechanism and the acoustic emission (AE) response of the material to ensure the safety of structures. In this study, an AE monitor system and an in situ tensile test with an optical microscope were used to investigate the AE response and insight into the damage process of Q235 steel. The surface of the specimen was polished and etched before the test in order to improve the quality of micrographs. Two kinds of AE responses, namely a burst and a continuous signal, were recorded by the AE monitor system during the test. Based on the in situ test, it was observed that the damage of Q235 steel was induced by the crystal slip and the inclusion fracture. Since the crystal slip was an ongoing process, continuous AE signals were produced, while burst AE signals were possibly produced by the inclusion fracture which occurred suddenly with released higher energy. In addition, a great number of AE signals with high amplitude were observed during the yielding stage and then the number and amplitude decreased.
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影响因子：
6.2
作者：
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DOI：
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期刊：
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