| Currently, many researchers have did a lot of work on fatigue investigation about the circular tube joint at home and abroad. Though breakthrough were made, the high performance steel were began to come into applied in structure field. The fatigue behavior of this material was still unfamiliar for engineers. Investigations and experiments were seldom reported. Compared to traditional steel, this new material would be of great difference from traditional steel both in the weld capability and the material behavior. Therefore, fatigue investigation should be conducted and document or data should be collected. It would be of great benefit for design theory development and technology stimulation. All around the world, the investigation were mostly done by traditional experiment and theory. As the highly cost of fatigue tests, theoretic analysis is an important way in the field and it’s better for the understanding to the fatigue.In this paper, investigate the Q 460 C high performance steel though the cumulative damage theory. Damage evolution equation and model were set up and a whole process analytical FEM were proposed. In that way, circular T joint fatigue experiment were tested and investigation were conducted. This provided a better way for fatigue life prediction.① Based on “Metallic Materials Fatigue Testing Axial-forece-controlled method”, An S-N curve experiment were designed and conducted to investigate Q460 C steel;② Resistance were measured in the fatigue tests, which would calculate the damage variable.③ Data from the fatigue and resistance tests were process to calculate the parameter in the damage evolution equation④ UMAT subroutine was updated with the gain parameter in the damage evolution equation, and the UMAT was called in the ABAQUS steel tube joint analysis⑤ Form the damage mechanics FEM, a high performance steel S-N curve for the T joint were preposed... |
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