本工作在-100℃—室温的温度范围内验证了最大切应力断裂判据对于延性断裂是适用的。利用此判据和裂纹顶端临界断裂应力(σ_(yy))_c与温度基本无关的期律可以定性地解释J_c和δ_(p,c)对温度的关系。试验还表明平均断裂强度基本上与试样几何和缺口顶端曲率半径无关。
The criterion of maximum shear stress for crack extension, namely, the critical fracture stress at the crack tip,(σ_(yy))_c=σ_F was verified to be applicable to the ductile fracture in the range between—100℃ up to room temperature.Considering the independence of this criterion and the critical fracture stress at crack tip upon temperature, the observed phenomena of which J_c decreases with decreasing temperature may be qualitatively explained. The specimen geometry and the curvature radii of notch root are not affected with the average fracture strength, but affected with the true fracture strain. Thereby, the fracture strength is probably an important descriptive parameter of mechanical properties of materials.
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