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本文以锌漆薄膜与304不锈钢基底之间的界面裂纹为研究对象,采用声发射与显微镜实时检测技术与三点弯曲试验相结合的方法,测量了锌漆涂层的界面断裂韧性。同时将界面裂纹长度的有限元模拟结果和实验结果相比较,结果较为吻合。通过ABAQUS有限元模拟发现,界面断裂韧性与多种影响因素有关,界面裂纹扩展长度随薄膜厚度和外荷载的增加而增加,随界面断裂韧性和薄膜弹性模量的增大而减小,而泊松比对其影响不大。
In this paper, the interface cracks between zinc coating and 304 stainless steel substrate were studied. The interface fracture toughness of zinc coating was measured by a combination of real-time acoustic emission and microscopy and three-point bending test. At the same time, the finite element simulation results of interface crack length are compared with the experimental results, the results are in good agreement. The results of ABAQUS finite element simulation show that the fracture toughness of the interface is related to various influencing factors. The propagation length of the interface crack increases with the increase of the film thickness and the external load, decreases with the increase of the interface fracture toughness and the elastic modulus of the thin film. Song than little effect on it.