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通过对带有不同孔径缺陷的Q235方形管材进行弯曲试验,模拟起重机械箱型构件由于受到外载荷作用,而出现的主梁下挠、侧弯、塑性变形等情况,并利用声发射监测弯曲试验过程,采集力学性能曲线和声发射信号,分析试件在弯曲试验过程中的力学性能和声发射特征,建立该材料的力学性能与声发射信号之间的联系。结果表明:起重机械箱型构件的缺陷越大,构件的力学性能越差,在声发射仪上的信号越强烈,总撞击数也就越多。
The bending test of Q235 square pipe with different aperture defects was used to simulate the bending, bending and plastic deformation of the main girder due to the external load, and the acoustic emission was used to monitor the bending During the testing process, the mechanical performance curve and the acoustic emission signal were collected. The mechanical properties and acoustic emission characteristics of the specimen during the bending test were analyzed. The relation between the mechanical properties of the material and the acoustic emission signal was established. The results show that the bigger the defects of the box components are, the worse the mechanical properties of the components are. The stronger the signal on the acoustic emitter, the more the total number of impacts.