关键词: 固体力学, 机械自紧, 残余应力, 塑性半径, 反向屈服, 反向屈服半径

Abstract:

To derive the residual stress of swage autofrettage gun barrel with elastic perfectly-plastic linear hardening material model, the elasticity and plasticity of barrel during loading and unloading are analyzed based on the theory of elastic-plastic mechanics and some assumptions. And the formulas of plastic radi- us, loading and unloading stress-strains, and reverse yielding radius of swage autofrettage gun barrel are derived. The residual stress formulas with and without reverse yielding are obtained by using loading and unloading stresses of gun barrel, respectively. In order to verify the accuracy, the plastic radius, reverse yielding radius and residual stress of barrel are calculated by using the presented formulas. The results show that the theoretical values are good agreement with the experiment results.

Key words: solid mechanics, swage autofrettage, residual stress, plastic radius, reverse yielding, re- verse yielding radius