Fatigue Mechanism And Life Estimation On 40Cr High-strength Bolt In Grid Structure With Bolt-sphere Joints

The fatigue of grid structure with holt-sphere joints is mainly the fatigue of high-strength holt. The design method of fatigue is usually established by way of fatigue tests home and abroad. A few of studies on its fatigue mechanism and life estimation are proceeded presently.In this paper, a lot of macro and micro fracture sections under equal and variable amplitude loads are analyzed on 40Cr high-strength bolts by use of scan-electronic microscope. Its fatigue mechanism is known fundamentally. Moreover, base on lots of test data, fatigue life estimation is finished by help of Miner, opposite Miner rule and fracture mechanics theory. Theoretic results and test data are well fit to each other.The research results in this paper fill the blank of the theoretic studies on fatigue behavior of grid structure with bolt-sphere joints and the fatigue research method is perfected. I believe that conclusions and suggestions will become important references for the modification of .