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本文提出用实心圆试样测定纯剪切的损伤因子。是继文献~([1]～[2])后的研究成果。其理论根据是Nadai公式~([3])。根据这个公式,得到破坏应力τ-=Mu/(πd~3/12)。这相当于把钢看成理想弹塑性材料。当扭矩M_T>M_s时,材料开始出现损伤。随着M_r的增大,弹性核不断缩小,在极限情况下,应力趋于τ_u。因此,可以假定损伤区的损伤因子也趋于D_c。在临近破坏的极限情况下,按D=1～G/G得到的损伤因子,即为材料纯剪切损伤因子的临界值,文中用A_3钢和45钢作实验,并与文献~([2])的结果比较,发现两者几乎完全一致。
In this paper, pure circular test specimens are used to determine the pure shear damage factor. Is following the literature ~ ([1] ~ [2]) after the research results. The theoretical basis is Nadai formula ~ ([3]). According to this formula, the failure stress τ- = Mu / (πd ~ 3/12) is obtained. This is equivalent to the steel as an ideal elastic-plastic material. When the torque M_T> M_s, the material began to damage. As M_r increases, the elastic nuclei continue to shrink, in the limit case, the stress tends to τ_u. Therefore, it can be assumed that the lesion area damage factor also tends to D_c. The damage factor obtained at D = 1 ~ G / G is the critical value of the pure shear damage factor near the limit of failure. In this paper, A_3 steel and 45 steel are used for experiments, and compared with the literature ~ ([2 ]), We found that the two were almost identical.