Analysis and Improvement for the Failure of Seat Belt Anchor of a Car Based on Simulation and Experiment

A numerical simulation and improvement was performed for the failure of seat belt anchor of a car, because of large deformation of roof and tearing of floor during certification test. Firstly, an appropriate loading curve according to ECER14 was chosen; secondly, adjust the FE model of broken area in order to reflect the real structure; At last, the simulation result was coincidental with the test result through defining the failure rule for material of metal. Based on this model, improvement methods were provided: decreasing deformation of roof by installing back door and enhancing load capacity by adding nut stiffening plate. The result showed that these two methods can increase deformation resistance ability and loading capacity of body substantially, which has been applied to real car and helps to pass the regulation certificates.