Study on fatigue life of gun latch based on orthogonal test method

Abstract Aiming at the problem of fatigue damage gun latch caused by long-term impact load, life was studied. Firstly, finite element model established using method. Secondly, static strength and were calculated based on S-N curve Miner’s linear accumulation theory. On this basis, structural factors affecting bolt analyzed, four including radial diameter latch, axial bearing thickness spiral Angle support surface tail surface, locking clearance between set up, as well three variation levels each factor. Then, nine groups latches simulated orthogonal test In addition, range analysis method used to analyze simulation results, then influence law degree factor obtained. Moreover, optimal combination scheme structure parameters determined comprehensive balance method, carried out verify latch. The results show that maximum stress decreases 21.5% 28.2%, is lower than yield limit material. At same time, research also shows minimum increases greatly, body 20.8 times before test, 102.1 test. provide a reference for design