Simulation of the fatigue behaviour of a power plant steel with a damage variable
Simulation of the fatigue behaviour of a power plant steel with a damage variable
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DOI：
10.1016/j.ijmecsci.2015.06.019
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发表时间：
2015-09
影响因子：
7.3
通讯作者：
Jiawa Lu;Wei Sun;A. Becker;A. A. Saad-A.
中科院分区：
文献类型：
--
作者：
Jiawa Lu;Wei Sun;A. Becker;A. A. Saad-A.
通过单轴疲劳试验和电镜显微组织分析，研究了9Cr电站用钢在600 °C温度下的疲劳行为。将连续损伤力学方法与Chaboche弹粘塑性模型的本构方程相耦合，描述了9Cr电站用钢在600 °C下的疲劳行为。应力划分方法被引入到了解疲劳软化行为，并用于给出在Chaboche模型中的材料常数的初始估计。进一步的优化程序与塑性应变范围的材料常数的依赖性被引入到优化程序中，以准确地预测材料的行为，特别是在损伤开始后。一个ABAQUS的UMAT子程序进行编码，使整个生命周期的循环软化行为的发电厂组件，以准确地预测在有限元计算。对缺口棒测试数据的编码的多轴能力进行了验证。
The fatigue behaviour of a 9Cr power plant steel at a temperature of 600 °C was studied by uniaxial fatigue tests and microstructural analysis using electron microscopy. A continuum damage mechanics apporach was coupled to the constitutive equations of the Chaboche elasto-visco-plastic model to describe the fatigue behaviour of the 9Cr power plant steel at 600 °C. A stress partition method is introduced to understand the fatigue softening behaviour, and used to give an initial estimate of the material constants in the Chaboche model. Further optimisation procedures with plastic strain range dependency of the material constants were introduced in the optimisation procedure in order to accurately predict the material behaviour, especially after damage initiation. An ABAQUS UMAT subroutine was coded to allow the full life cyclic softening behaviour of a power plant component to be accurately predicted in a finite element calculation. The multiaxial capability of the coding is validated against notched bar test data.