抄録
Fatigue tests were carried out under a Gaussian type block- and random loading, using a newly developed computer- controlled high-speed fatigue testing system equipped with a random wave generator based on the matrix method. It was found that the fatigue life under random loading is shorter by half than that under block loading even for the same frequency distributions of the loads. A simple life-prediction procedure was developed by considering the local stress-strain behavior and fatigue damage parameter concept. The predicted fatigue life agreed well with the test results under block loading in different mean load level conditions. In the case of random loading also, the life prediction gave satisfactory results, but it was necessary to assume a value of critical fatigue damage accumulation of 0.5 instead of unity.
