SIF calculation of Car Body Based on Sub-model Method  
Author Ruijin Zhang


Co-Author(s) Shaodong Wei; Shuo Zhao; Haichao Tang


Abstract The accurate and efficient calculation of stress intensity factor (SIF) is necessary for damage tolerance design and safety assessment of engineering structures. According to the structural characteristics of car body, the simulation method of SIF calculation was firstly studied based on a simple plate structure respectively submitted to planar deformation and spatial bending deformation. The results showed that the shell element model could be used in SIFs calculation with a high accuracy in planar deformation state, and the shell-solid element coupling model should be used in spatial bending deformation state. Then, the sub-model method was applied in the fracture mechanics analysis of the side wall door column of car body with different crack lengths of assuming crack. The SIF simulation results by using the sub-model method were compared with the ones by using the whole car body model. It can be concluded that the sub-model method not only had a better accuracy in fracture mechanics simulation, but also greatly increased the computation efficiency for a complex structure.


Keywords Stress intensity factor(SIF), shell-solid element coupling, sub-model
    Article #:  RQD25-210
Proceedings of 25th ISSAT International Conference on Reliability & Quality in Design
August 1-3, 2019 - Las Vegas, NV, U.S.A.