Shakedown and ratcheting behavior of structures under thermal cycling

Swaminathan, Sriram (2005) Shakedown and ratcheting behavior of structures under thermal cycling. Masters thesis, Memorial University of Newfoundland.

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Abstract

Analysis of stress generation in pressure vessels during thermal cycling is a difficult complex subject that is receiving increased attention. Cyclic plastic finite element analysis was performed with thermal cycling with a view to quantify the phenomena of ratcheting. The framework of constitutive theory of rate-independent plasticity has been reviewed and the new developments in this field summarized. This thesis also reviews the basic equations, solution methods and important phenomena associated with thermal cycling that require numerical treatment. Stress analysis begins with a heat transfer analysis followed by a thermal stress analysis. Further complicating phenomena including shakedown ratcheting and structure-dependent plasticity is also considered. Computational issues include numerical methods of handling these phenomena, and two-dimensional and three-dimensional stress states.

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