金属材料拉伸断裂过程中的声发射特性研究  

Research on AE Characteristics of Metal Material During Tensile Fracture Process

作　　者：张志魁[1] 石健[1] 熊尉伶 赵广慧[1] 申鹏飞[1] 

机构地区：[1]西南石油大学机电工程学院,四川成都610500

出　　处：《热加工工艺》2016年第6期42-43,47,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(11102173)

摘　　要：对含有I型裂纹的SM490A试样,使用声发射仪检测了拉伸断裂过程中的塑性变形和断裂过程。通过声发射特征参数分析了裂纹尖端和塑性变形区域的力学特征。结果表明:用CCD图像来研究裂纹断裂过程中不同阶段的声发射信号是可行的,在断裂过程中含裂纹的SM490A试样在高速断裂时R方向与T方向试件产生的声发射信号之间的差异比低速断裂时的小。The plastic deformation and fracture process of SM490A sample containing I type crack were tested by acoustic emission instrument. By characteristic parameters of acoustic emission, the mechanics features of crack tip and plastic deformation area were analyzed. The results show that it is feasible to use the CCD image to study the acoustic emission signal in different states in fracture process. The difference of the acoustic emission signals of SM490A sample containing cracks in the fracture process of high speed steel fracturing in R direction and T direction is smaller than that in slow speed steel fracturing.

关 键 词：SM490A 断裂 声发射 轧制方向 

分 类 号：TG115[金属学及工艺—物理冶金]