A 3-D Model for Evaluating the Residual Stress Field Due to Swage Autofrettage

Author:

Perry J.1,Perl M.21

Affiliation:

1. Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel

2. Fellow ASME

Abstract

In order to maximize the performance of modern gun barrels in terms of strength-to-weight ratio and total fatigue life, favorable compressive residual stresses are introduced to the inner portion of the barrel, commonly by the autofrettage process. There are two major autofrettage processes for overstraining the tube: the hydrostatic and the swage. There are several theoretical solutions for hydrostatic autofrettage based on Lamé’s solution and the von Mises or Tresca yield criteria. The residual stress field due to hydraulic autofrettage is treated as an axisymmetric two-dimensional problem solved in terms of the radial displacement solely. Once the Bauschinger effect was included in these models they yield very realistic results. Unlike in the case of hydraulic autofrettage, swage autofrettage needs to be modeled by a three-dimensional model. The present analysis suggests a new 3-D axisymmetric model for solving the residual stress field due to swage autofrettage in terms of both the radial and the axial displacements. The axisymmetric equilibrium equations are approximated by finite differences and solved then by Gauss–Seidel method. Using the new computer code the stresses, the strains, the displacements, and the forces are determined. A full-scale instrumented swage autofrettage test was conducted and the numerical results were validated against the experimental findings. The calculated strains, the permanent bore enlargement, and the mandrel pushing force were found to be in very good agreement with the measured values.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference14 articles.

Cited by 16 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Generalized Plane Strain Study of Rotational Autofrettage of Thick-Walled Cylinders—Part I: Theoretical Analysis;Journal of Pressure Vessel Technology;2019-07-15

2. The detrimental effect of autofrettage on externally cracked modern tank gun barrels;Defence Technology;2019-04

3. A Review of Theoretical and Experimental Research on Various Autofrettage Processes;Journal of Pressure Vessel Technology;2018-08-02

4. Design of two-pass swage autofrettage processes of thick-walled cylinders by computer modeling;Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science;2018-04-13

5. Gun Barrel Refurbishing Using a Shrink-Fitted Autofrettaged Liner;Journal of Pressure Vessel Technology;2018-02-22

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