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Multiaxial fatigue life prediction method of notched specimens considering stress gradient effect

机译:考虑应力梯度效应的缺口标本的多轴疲劳寿命预测方法

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摘要

This paper investigates the effect of stress gradient on the fatigue life of U-notched specimens under multiaxial proportional loading by studying the shear stress gradient and normal stress gradient on the crack initiation plane separately. First, based on the energy method and critical plane method, an energy-critical plane method for determining the direction of crack initiation is proposed. Second, with the help of the concept of stress field intensity, the shear stress gradient and normal stress gradient on the critical plane are studied. Finally, a multiaxial fatigue life prediction model is established by combining the equivalent stress field intensity, composed of the shear stress field intensity and normal stress field intensity, with the Manson-Coffin equation. Theoretical analysis is verified by the experiments of Q345 steel notched specimens, and the results show that the predicted accuracy of the proposed method is not conservative and is superior to the local stress-strain method.
机译:本文通过分别研究裂纹起始平面上的剪切应力梯度和正常应力梯度,研究了应力梯度对多轴比例载荷下的U型缺陷标本的疲劳寿命的影响。首先,基于能量法和临界平面方法,提出了一种用于确定裂纹启动方向的能量关键平面方法。其次,在应力场强的概念的帮助下,研究了临界平面上的剪切应力梯度和正常应力梯度。最后,通过曼森 - 棺材方程组合由剪切应力场强度和正常应力场强度组成的等效应力场强度来建立多轴疲劳寿命预测模型。 Q345钢缺口样本的实验验证了理论分析,结果表明,所提出的方法的预测精度不是保守的,并且优于局部应力 - 应变法。

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