研究了带环状预裂纹不锈钢圆棒试样在循环扭转载荷下、门槛值附近的疲劳裂纹扩展行为, 用应力强度因子表征了裂纹扩展开始的门槛值。随着裂纹的扩展, 裂纹扩展速率由于裂纹面的滑移接触而减小。通过外插裂纹扩展速率与裂纹长度之间的关系, 可近似得到裂纹长度为零时无裂纹面滑移接触影响的裂纹扩展速率。施加的应力强度因子范围可分解为推动裂纹扩展的有效值和由于裂纹面的滑移接触而屏蔽掉的两部分。预测了疲劳裂纹的萌生和断裂极限, 预测值和实验值相当一致。
Near threshold fatigue crack growth tests were conducted under torsion on circumferentially pre--cracked round bars of a stainless steel. The crack growth rate was decreased with crack extension because of the sliding contact of the crack faces. The crack growth rate without the influence of crack surface contact was determined by extrapolating the relationship between the crack growth rate and the crack extension to the zero crack length. The applied stress intensity factor range is divided into two parts: one is the effective value responsible for crack growth and the other is the shielding value dissolved by crack surfaces contact. The fatigue limits for crack initiation and fracture were predicted and the predicted values agreed well with the experimental results.
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