摘要
通过考虑碳化物粗化和孔洞形核与长大对Fe-Cr-Ni基奥氏体不锈钢蠕变损伤的影响,基于sinh函数建立了新的蠕变损伤本构模型,开发了模型材料参数优化程序,并结合有限元方法,对标准圆棒试样进行了宽应力范围内的蠕变行为研究,比较了基于3种蠕变损伤模型所计算的试样失效时间。结果表明:提出的本构模型能够准确地反映材料在890℃不同应力水平下的蠕变行为;与广泛使用的幂律型Kachanov-Robotnov模型和Liu-Murakami模型所预测的失效时间相比,该模型的预测结果可以反映宽应力范围内应力和蠕变破断时间在双对数坐标下的非线性关系,预测结果更为合理。
Considering the effect of carbide coarsening and void nucleation and growth on the creep damage of Fe-Cr-Ni based austenitic stainless steel,a new creep damage constitutive model was established based on the hyperbolic sinh function,and material parameter optimization procedure of the model was also developed.In addition,a comparative assessment of extrapolated failure times for 3 creep damage models was undertaken for the standard uniaxial round-bar specimen using finite element software.The results show that the proposed constitutive model is capable to reflect the creep behavior of the material under different stress levels at 890℃.Compared with the failure time predicted by the widely used power law model(Kachanov-Robotnov model and Liu-Murakami model),the prediction results of the current model can reflect the nonlinear relationship between stress and creep rupture time under double logarithmic coordinates in a wide stress range,so the prediction results are more reasonable.
作者
郭晓峰
刘本鑫
南宁宁
巩建鸣
董志明
GUO XiaoFeng;LIU BenXin;NAN NingNing;GONG JianMing;DONG ZhiMing(School of Mechanical Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China;Inner Mongolia North Hauler Joint Stock Co.,Ltd.,Baotou 014030,China)
出处
《机械强度》
CAS
CSCD
北大核心
2022年第5期1201-1206,共6页
Journal of Mechanical Strength
基金
国家重点研发计划项目(2017YFF0210401)
国家自然科学基金项目(51805274)资助。
作者简介
郭晓峰,男,1986年6月生,内蒙古包头人,汉族,内蒙古科技大学讲师,博士,主要从事高温强度理论与先进装备技术研究。
