扭转载荷下带环状裂纹圆棒的J积分的评价

J-integral estimation of circumferential-cracked round bars subjected torsion

研究了扭转载荷下带环状裂纹圆棒试样的J积分的评价。首先得到了一系列带有不同深度环状切口的中碳钢圆棒试样的扭矩-扭转角关系,然后分别利用单试样的简单评价法和多试样的能量法计算J积分值。结果发现,当圆棒试样的切口深度足够深(即裂纹长度足够长)或扭转角足够小时,两种方法计算的J积分值相当一致。

In the present paper, the J integral was estimated from the relation between torque and twist angle of a cylindrical bar with a deep circumferential crack. The J integral value obtained by the simple estimation method agrees well with that determined by the energy method using multiple medium carbon steel specimens with a circumferential notch, as far as the notch depth is deep or as far as the twist angle is small.