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材料的平面应变断裂韧性K_(IC)(简称断裂韧性),是以线弹性断裂力学为基础而提出的一个衡量材料抵抗低应力断裂能力的重要指标。线弹性断裂力学认为,具有裂纹的构件(即裂纹体),承受应力强度因子K_I的能力有一定的限度,当K_IK_(IC)时,裂纹失稳扩展,裂纹体断裂破坏。因此,K_(IC)值越高,材料抗断裂的韧性就越好。K_(IC)和σ_(0.2)(名义屈服极限)一样是取决于材料本身的性能。在室温、静载下
The plane strain fracture toughness K_ (IC) of the material (fracture toughness for short) is a measure of the material’s resistance to low stress rupture based on the linear elastic fracture mechanics. The linear elastic fracture mechanics holds that the cracked member (ie, crack body) has a certain limit to its ability to bear the stress intensity factor K_I. When K_I K_ (IC), the crack instability expands and the crack body ruptures. Therefore, the higher the K_ (IC) value, the better the toughness of the material against rupture. The K_ (IC) and σ_ (0.2) (nominal yield point) are also dependent on the properties of the material itself. At room temperature, static load