Abstract
This study aims to investigate the true stress and the plastic shakedown behavior of a cyclically loaded pressure vessel. To serve this study, an experimental platform has been built up, which comprised of a self-made thin-wall cylinder pressure vessel, a water pressure loading system to simulate the actual working loading condition, and strain gauge sets for strain measurement. A number of experiments have been done by cyclically loading and unloading the vessel at different strain levels of plastic deformation to shakedown state in different experiments respectively. The relationship between plastic strain and shakedown range has therefore been obtained. The true stress-strain constitutive model of the vessel under large deformation condition has also been derived. The experiments lead to three observations: (1) the strain hardening technology can effectively reduce the residual stress of stainless steel pressure vessel. (2) The shakedown range is less than 2000 μe for a total strain under 4%, and yet the shakedown range increases fast to more than 3000 μe for a total strain higher than 6%. (3) It is also found that the true stress-strain constitutive model given in this paper describes the multi-axial stress-strain state of pressure vessels, and validates the engineering practicability of conventional uniaxial tensile shakedown constitutive curve.
Highlights
How to establish shakedown design criteria in consideration of strain hardening technology to design pressure vessels has been focused in recent years
This paper investigates the relationship between plastic strain and shakedown range, as well as the relationship between plastic strain and residual stress based on experiments
The results show that strain hardening technology can effectively reduce the residual stress of stainless steel pressure vessel
Summary
How to establish shakedown design criteria in consideration of strain hardening technology to design pressure vessels has been focused in recent years. Shakedown analysis is a study of plastic behavior of engineering structure subjected to cyclic loading. The shakedown critical load of a structure can be obtained based on shakedown and accumulated plastic strain analysis. A structure cyclically loaded within its critical load will get into shakedown state. If cyclically loading the structure beyond its critical load, an increment plastic collapse or alternating plastic collapse will occur to the structure due to the continuously accumulated plastic strain. For a pressure vessel subjected to cyclic loading, the strain accumulation with continuous plastic deformation should be noticed. It has great theoretical and practical significance to apply shakedown analysis to strain hardening technology
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