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δ=δ_■+δ_ρ是裂纹尖端张开位移的计算公式.它的物理概念较清楚,和K_(IC)、J_(IC)也能在理论上一致起来.但按BS5762(1979)原式δ=0.5(k_1~2))/(E’σ_v)+(0.4(W-a))/(0.4W+0.6a+Z)V_p所得计算值往往比Wells理论公式过于偏小.本文分析了该式过于保守的原因,对δ_■部分的计算式作了推导.
δ = δ_δ + δ_ρ is the formula for calculating the crack tip opening displacement, and its physical concept is clearer and consistent with K_ (IC) and J_ (IC) theoretically. However, according to the original δ = 0.5 (k_1 ~ 2)) / (E’σ_v) + (0.4 (Wa)) / (0.4W + 0.6a + Z) V_p is often too small compared with the Wells theoretical formula. Conservative reasons, the δ_ ■ part of the formula was derived.