摘要
开展了T91钢在不同高温及不同应力水平下的蠕变实验,探讨其在高温下的蠕变力学性能和失效寿命,进而拟合得到耦合损伤的蠕变本构模型。基于微观力学,在蠕变本构方程中引入均匀化损伤理论,得到耦合损伤的蠕变本构方程。通过对实验数据的拟合,确定本构模型的材料参数,进而对T91钢在不同温度和不同应力水平下的蠕变行为进行预测。之后,与不考虑损伤的蠕变本构模型预测结果进行对比。结果表明,耦合损伤蠕变模型能较为合理地预测T91的高温蠕变行为。
The creep experiments under different stress levels are carried out to explore the creep mechanical properties and failure lives of T91 steel at different elevated temperatures,and then the damage-coupled creep constitutive model is obtained by fitting.Based on the micromechanics theory,the homogenized damage theory is introduced into the creep equation,and the damage-coupled creep constitutive equation is obtained.Through fitting the experimental data,material parameters of the constitutive model are calibrated,and then the creep behaviors of T91 steel at different elevated temperatures and stress levels are predicted.Finally,the simulated results are compared with the predicted results of the creep model without considering the damage,and the results show that the proposed damage-coupled creep model can reasonably predict the creep behavior of T91 steel at elevated temperature.
作者
姜礼益
宋世杰
阚前华
JIANG Liyi;SONG Shijie;KAN Qianhua(School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611756,China)
出处
《四川轻化工大学学报（自然科学版）》
CAS
2023年第1期1-10,共10页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
基金
四川省重大科技专项项目(HT-SDQB-05-17-2020KT01)。
关键词
T91钢
高温蠕变
本构模型
损伤演化
寿命预测
T91 steel
elevated temperature creep
constitutive model
damage evolution
life prediction
