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J积分的临界值J_(Ic)(张开型)目前被广泛用作中低强度钢的断裂准则.根据线弹性断裂力学理论和弹塑性断裂力学的实验规律,现提出一个新的J积分和应变能间的关系式:J=2/B(W-α)[U—U_o+(M~2ψ)/(BE′W~2)],其中ψ与跨距S/W和裂纹深度α/W有关·此式对于跨距和裂纹深度没有限制,因而作为弯曲试样的J积分计算公式,具有较为广泛的适用范围·当α/W=0时,J=0,从物理意义上看也比较合理,为了便利计算,并列出ψ值表,可以查找。
The critical value J_ (Ic) (open type) of J-integral is widely used as the criterion for the fracture of low and medium strength steels.According to the theory of linear elastic fracture mechanics and the experimental rules of elasto-plastic fracture mechanics, a new J-integral and The relationship between strain energy: J = 2 / B (W-α) [U-U_o + (M ~ 2ψ) / (BE’W ~ 2)], where ψ is related to the span S / W and the crack depth α / W This equation has no limitation on the span and depth of crack, and thus has a wide range of applicability as a J-integral calculation formula for a curved specimen. J = 0 when α / W = 0 is also physically compared Reasonable, in order to facilitate the calculation, and list the ψ value, you can find.