靳慧, 王立彬, 王金诺. 弹塑性随机有限元在低周疲劳分析中的应用[J]. 工程力学, 2004, 21(3): 196-200.
引用本文: 靳慧, 王立彬, 王金诺. 弹塑性随机有限元在低周疲劳分析中的应用[J]. 工程力学, 2004, 21(3): 196-200.
JIN Hui, WANG Li-bin, WANG Jin-nuo. THE APPLICATION OF ELASTOPLASTIC STOCHASTIC FINITE ELEMENT METHOD IN LOW CYCLE FATIGUE ANALYSIS[J]. Engineering Mechanics, 2004, 21(3): 196-200.
Citation: JIN Hui, WANG Li-bin, WANG Jin-nuo. THE APPLICATION OF ELASTOPLASTIC STOCHASTIC FINITE ELEMENT METHOD IN LOW CYCLE FATIGUE ANALYSIS[J]. Engineering Mechanics, 2004, 21(3): 196-200.

弹塑性随机有限元在低周疲劳分析中的应用

THE APPLICATION OF ELASTOPLASTIC STOCHASTIC FINITE ELEMENT METHOD IN LOW CYCLE FATIGUE ANALYSIS

  • 摘要: 推导了交变载荷下弹塑性随机有限元的迭代格式,计算了局部多轴应力应变的随机响应.迭代格式中,针对复杂的交变载荷,采用运动强化模型反映塑性变形引起的各向异性和包辛格效应,运用Jhansale模型描述材料的瞬态应力应变关系.弹塑性有限元分析,克服了以往近似方法只能计算单轴局部应力应变响应的缺陷,为多轴疲劳分析奠定了基础.考虑零构件的随机因素,将随机有限元方法引入到交变载荷下弹塑性有限元的迭代格式中,得到局部应力应变的随机响应,为低周疲劳可靠性分析提供了更精确的依据.Mont Carlo模拟结果证实了提出的弹塑性随机有限元方法是可靠的.

     

    Abstract: The iterative formulas of elastoplastic stochastic finite element method (SFEM) under cyclic loading are deduced and the random responses of local multiaxial stress and strain are calculated. According to the complication of cyclic loading the anisotropy and Bauschinger effect resulting from plastic deformation are reflected in the kinematic hardening model. The transient stress-strain relation of Jhansale model is considered in the iterative formulas. The elastoplastic finite element method (EFEM) overcomes the limitation that only the uniaxial local stress and strain could be calculated by the approximate method, establishing the base of multiaxial fatigue analysis. The component randomness is considered. The SFEM is introduced in the iterative formulas of EFEM under cyclic loading to obtain the random response of local stress and strain. The result of Mont Carlo simulation demonstrates the efficiency of the proposed method.

     

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