摘要
采用自适应有限元分析与弹塑性分析方法,对某离心压缩机叶轮进行精细的静强度分析.阐述了对网格不敏感的结构热点应力的概念.得到了基于结构热点应力相应的强度判别准则,并对叶轮的von Mises应力和等效塑性应变随时间演化历程进行了分析.数值模拟结果表明,对叶轮进行超速预加载处理,能够有效扩大材料的弹性工作范围,降低叶轮正常工作时的应力水平,且超速预加载工艺符合其力学机理.
Finite element method and elastic-plastic analysis method are employed to carry out refined static strength analysis for a centrifugal compressor impeller.The concept of structural hot spot stress is introduced which is not sensitive to the mesh size.The strength criterion based on the structural hot spot stress is acquired,and the evolution of von Mises stress and equivalent plastic strain with time is analyzed.The numerical simulation results show that dealing with the pre-over loading on the impeller can expand the range of flexibly working of the material,reduce the level of impeller stress under the normal working condition effectively,and the pre-over loading techniques accord with the mechanical mechanism of the impeller.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2011年第2期157-162,共6页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(10721062)
"九七三"国家重点基础研究发展计划资助项目(2009CB724302)
关键词
超速预加载
残余应力
等效塑性应变
结构热点应力
pre-over loading
residual stress
equivalent plastic strain
structural hot spot stress
