理想弹塑性线性强化模型的身管残余应力分析

为计算理想弹塑性线性强化模型机械自紧身管的残余应力,基于弹塑性力学和一些基本假设,通过对加载和卸载过程中的身管做弹塑性分析,得到了机械自紧身管的塑性半径、加载和卸载过程中的应力应变、反向屈服半径的计算公式。利用机械自紧身管加载和卸载过程中的应力,给出了身管有反向屈服和无反向屈服两种情况下残余应力的计算公式。应用这些公式计算了一个模拟管的塑性半径、反向屈服半径和残余应力,结果表明理论值与实验值吻合良好。

Residual Stress Analysis of Gun Barrel with Bi-linear Material Model

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.