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    基于数字散斑相关技术与有限元仿真相结合方法研究0Cr18Ni9不锈钢的断裂行为

    Research on Fracture Behavior of 0Cr18Ni9 Stainless Steel Based on the Combination Method of Digital Speckle Correlation Technology and Finite Element Simulaiton

    • 摘要: 依据GB/T 21143-2014,对0Cr18Ni9不锈钢板紧凑拉伸试样进行了断裂试验,结合扫描电镜(SEM)观察其钝化线,采用数字散斑相关技术和有限元仿真相结合的方法得到了裂纹区域的应变和应力场。结果表明:0Cr18Ni9不锈钢钝化线斜率约为GB/T 21143-2014推荐经验钝化线斜率的2倍;该材料呈现出高韧性断裂特征,试样在发生较大范围屈服时,裂纹才明显张开,试样启裂时,韧带区域已全面屈服;断裂力学有限元仿真验证了数字散斑相关技术的适用性,数字散斑相关技术能够比较准确地表征裂尖“奇异区”外的结构应变场。

       

      Abstract: According to GB/T 21143-2014, the fracture test was carried out on the compact tensile specimens of 0Cr18Ni9 stainless steel, the blunting line was observed by scanning electron microscope (SEM), and the strain and stress fields in the crack area were obtained by the combination method of digital speckle test technique and finite element simulation. The results show that the slope of the blunting line of 0Cr18Ni9 stainless steel was about double of that of the recommended experience blunting line of GB/T 21143-2014; the material exhibited high toughness fracture characteristics, and the crack was opened when the specimen was yielding in a large range, and the ligament area had already yielded completely when the specimen cracked; the applicability of the digital speckle correlation technique was verified by the finite element simulation of fracture mechanics, and the digital speckle correlation technology could accurately characterize the structural strain field outside the crack tip ‘singular region’.

       

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