摘要
常规的有限元疲劳寿命仿真分析采用连续函数作为形状函数,在处理位移不连续问题时,需将裂尖附近网格进行高密处理和重新剖分来进行裂纹扩展模拟,导致求解规模大,计算效率低。采用扩展有限元法和虚拟裂纹闭合技术,以吊挂结构为研究对象,通过建立局部模型,对疲劳裂纹扩展寿命进行分析计算,使得计算效率提高,且计算结果与试验结果相比,误差仅为8.2%,从而证明了该方法的有效性。
The conventional finite element simulation of the fatigue life analysis using continuous function as shape function, In dealing with the problem of displacement discontinuity, It is necessary to carry out crack propagation simulation by high density meshing and re-segmentation in the vicinity of the crack tip, which leads to large scale and low computational efficiency. In this paper, based on the hanging structure, through the establishment of local model, the extended finite element method and the virtual crack closure technique are used crack propagation life, improving computational efficiency, the calculation results compared results, error was only 8.2%, proving the effectiveness of the proposed method. to simulate the fatigue with the experimental
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2017年第5期905-909,共5页
Journal of Northwestern Polytechnical University
关键词
疲劳裂纹扩展
扩展有限元
虚拟裂纹闭合技术
仿真分析
ABAQUS
computational efficiency
crack tips
design of experiments
fatigue crack propagation
mesh generation
