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用断裂阻力曲线法测得的材料断裂韧性J积分参数值能够完整地反应材料阻止裂纹扩展的特性。我国目前正在为制定《断裂韧性J_(1C)标准》做大量试验工作。在J_(1C)标准组制定的“统一试验方法”中规定用直观做图法绘制断裂阻力曲线。由于没有绘制阻力曲线的具体规定,因而给出同一组数据,不同人绘出不同的阻力曲线,得出不同的断裂韧性J积分参数值。这种因人而异的随意性,给准确测定材料的断裂韧性参数值带来困难。我们分析许多钢种的不同单位测试的
The value of J integral parameter of material fracture toughness measured by fracture resistance curve method can fully reflect the material’s property of preventing crack propagation. At present, China is making a large amount of experimental work for the development of “fracture toughness J_ (1C) standard”. In the J_ (1C) standard group developed “uniform test method” provides the use of intuitive drawing method to draw the fracture resistance curve. Because there is no specific regulation of drawing the resistance curve, the same set of data is given. Different people draw different resistance curves and get different J values of fracture toughness. This random and random nature of the material to determine the fracture toughness parameter values difficult. We analyze different units of many types of steel for testing