The fatigue performance test on automotive frame steel using two dimensional up-and-down Method

摘要

The fatigue performances of two types of automotive frame steel include WL510 and WL590 are test with both traditional up-and down method and two dimensional method. In order to take the thickness effect into account, two series of WL510 samples with 6mm and 8mm thickness respectively are selected. Some important parameters of the two dimensional up-and-down method is introduced. Six cases of testing using two dimensional method are compared with the tradition one. Results shows that the fatigue limits of two dimensional method are much closer to the full sample results than the traditional one dimensional method. When the number of the test samples decreases, the deviation becomes larger, and the deviation is still very large even use two dimensional method when the test is with very few samples. In order to guarantee the result accuracy, at least 4 stress pairs are suggested be kept in the test.