Projects per year
Abstract
A new four-dimensional ratcheting boundary is derived analytically for the first time considering the interaction among four types of stresses: constant mechanical membrane stress, mechanical bending stress, cyclic thermal membrane stress, and thermal bending stress. A uniaxial beam model is used to derive the closed-form ratcheting boundary for these combined cyclic and constant loadings. The Tresca yield condition and elastic-perfectly plastic behavior are assumed. A novel two-plane FE model is proposed for numerical validation and the results predicted by analytical solution agree very well with that obtained by two-plane FE model. The solution of the classical Bree problem is the one of special cases when this new four-dimensional ratcheting boundary is reduced into two-dimensional style. The relationship between the three-dimensional ratcheting boundary adopted by the newly implemented ASME VIII -2 Pressure Vessel Code and the proposed four-dimensional ratcheting boundary is also discussed.
Original language | English |
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Number of pages | 29 |
Journal | European Journal of Mechanics - A/Solids |
Publication status | Accepted/In press - 2 Mar 2018 |
Keywords
- ratchet boundary
- shakedown
- two-plane model
- plastic FEA
- noncyclic method
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Projects
- 1 Finished
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Novel Direct Methods on the High Temperature Creep Fatigue Assessment (Newton Funds)
15/03/15 → 14/03/18
Project: Research