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由于测定平面应变断裂韧性K_(IC)的技术设备比较复杂,试样加工费料费工,而且在某些情况下尚不能测得可靠的K_(IC)值。因此,人们力图寻求简易的测定K_(IC)的方法,同时设法建立K_(IC)与拉伸试验所测定的机械性能指标间的关系式,用拉伸试验所测定的机械性能指标来估计K_(IC)值。文献[1,2]作了这种尝试,结果表明,对铝、钛等合金,估算的K_(IC)值与实验测定的K_(IC)值相当吻合。但对于常用结构钢,目前还没有一个较精确的估算K_(IC)的方法。
Due to the complexity of the technology and equipment for determining the K strain (strain) of plane strain fracture toughness, the sample processing cost is very high, and reliable K IC values can not be measured in some cases. Therefore, people try to find a simple method to determine K_ (IC), and at the same time try to establish the relationship between K_ (IC) and mechanical properties measured by tensile test, and use the mechanical properties measured by tensile test to estimate K_ (IC) value. This attempt has been made in the literature [1, 2]. The results show that the estimated K IC values agree well with the experimentally determined K IC values for aluminum and titanium alloys. But for the common structural steel, there is not a more accurate method to estimate K_ (IC).