摘要
为研究航空发动机火焰筒常用材料GH3536的变形行为,采用Chaboche统一粘塑性本构模型对其力学特性进行本构建模。为了精确地模拟材料蠕变过程的第三阶段,在Chaboche粘塑性本构模型中耦合Robotnov蠕变损伤率,并通过后向欧拉法对该本构模型进行离散化,将其转化为一组差分方程。进一步通过多岛遗传算法获取材料参数,最后通过用户子程序UMAT将Chaboche粘塑性本构模型植入到ABAQUS软件中进行数值分析,实现对GH3536合金多个温度(20~1000℃)条件下长时(蠕变)和短时(单轴拉伸、疲劳、蠕变-疲劳交互作用)力学行为的统一描述。数值分析结果表明,模拟曲线与试验结果具有较好的一致性,说明耦合Robotnov蠕变损伤率的Chaboche粘塑性本构模型能够准确统一描述多个温度条件下GH3536合金的力学行为。
To investigate the deformation behavior of GH3536,a material commonly used in aero-engine combustion liner,the mechanical properties were modeled using the Chaboche unified viscoplasticity constitutive.To accurately simulate the tertiary creep deformation,the Robotnov creep damage rate was coupled into the Chaboche model.The constitutive equations were discretized into a set of differential equations using the backward Euler method.Material parameters were then identified and optimized by employing a multi-island genetic algorithm.Finally,the Chaboche model was implemented into ABAQUS software through the user material subroutine UMAT for numerical simulation.Based on the constitutive model,the long-term(creep)and short-term(uniaxial tension,fatigue,creep-fatigue interaction)mechanical behaviors of GH3536 under multiple temperature conditions(20~1000°C)were characterized uniformly.Numerical results reveal good consistency between simulated and the experimental outcomes.demonstrating that the Chaboche model coupled with Robotnov creep damage rate uniformly described the mechanical behavior of GH3536.
作者
余嘉伟
甘阳
杨旭峰
杨秦政
汪文君
艾兴
彭至为
YU Jiawei;GAN Yang;YANG Xufeng;YANG Qinzheng;WANG Wenjun;AI Xing;PENG Zhiwei(Hunan Aviation Powerplant Research Institute,Aero Engine Corporation of China,Zhuzhou Hunan 412002,China;College of Power and Energy Engineering,Nanchang Hangkong University,Nanchang 330063,China)
出处
《南昌航空大学学报(自然科学版)》
2025年第2期77-88,共12页
Journal of Nanchang Hangkong University(Natural Sciences)
基金
江西省自然科学基金青年项目(20232BAB214051)
南昌航空大学博士启动基金项目(EA202206362)。
关键词
火焰筒
GH3536
粘塑性本构
参数识别
combustion liner
GH3536
viscoplastic constitutive model
parameters identification
