CAJ | 학술논문

该研究提出一种多轴疲劳寿命预测模型。结合现有的几种多轴疲劳模型的优点和不足之处，分别对正应变能部分和剪应变能部分做出了修正，提出了一个能够适用于多种载荷形式的多轴疲劳寿命预测模型。该模型通过求解莫尔圆把剪应变幅作为临界面判定参量，把临界面上的总应变能作为损伤参量。运用SNCM630合金钢、纯钛和钛合金等4种材料的疲劳试验数据对提出的模型进行评估和验证，尽管材料特性和载荷形式各异，但所有的预测寿命基本都落在了试验寿命两倍的公差带以内，这证明提出的新模型具有较高的预测精度。
해연구제출일충다축피로수명예측모형。결합현유적궤충다축피로모형적우점화불족지처，분별대정응변능부분화전응변능부분주출료수정，제출료일개능구괄용우다충재하형식적다축피로수명예측모형。해모형통과구해막이원파전응변폭작위림계면판정삼량，파림계면상적총응변능작위손상삼량。운용SNCM630합금강、순태화태합금등4충재료적피로시험수거대제출적모형진행평고화험증，진관재료특성화재하형식각이，단소유적예측수명기본도락재료시험수명량배적공차대이내，저증명제출적신모형구유교고적예측정도。
A new multi-axial model fatigue criterion is proposed. Taking into account the advantage and shortage of several existing multi-axial fatigue criteria, modifications are made on the normal energy and shear energy part, and a new multiaxial fatigue criterion is proposed to predict fatigue life under proportion-al and non-proportional loadings. Through the calculation of Mohr’s circle, shear strain amplitude is taken as the parameter to determine the critical plane and total strain energy is taken as the damage parameter of the new model. The model is evaluated by the multiaxial fatigue test data of SNCM630 steel, pure titani-um, titanium alloy BT9,and titanium alloy TC4. Although loadings are complex and various, the predicted data are almost within a factor of 2 scatter band of the test results. The results show that the new model has a higher predicted accuracy.