In cyclic loading and when plastic flow occurs, discontinuities grow. In this research, interaction diagram of Bree has been developed when the spherical pressure vessel contains discontinuities such as voids and microcracks. Bree’s diagram is used for ratcheting assessment of pressurized equipment in ASME III NH. Nature of these defects leads to an anisotropic damage. Anisotropic Continuum Damage Mechanics (CDM) is considered to account effects of these discontinuities on the behavior of the structure. Shakedown – ratcheting response of a hollow sphere under constant internal pressure and cyclic thermal loadings are studied by using anisotropic CDM theory coupled with nonlinear kinematic hardening of Armstrong-Frederick m’s model (A-F). Return mapping method is used to solve numerically the developed relations. Elastic, elastic shakedown, plastic shakedown and ratcheting regions are illustrated in the modified Bree’s diagram. Influence of anisotropic damage due to the plastic deformation is studied and it was shown that the plastic shakedown region is diminished because of the developed damage.
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ASME 2018 Pressure Vessels and Piping Conference
July 15–20, 2018
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5163-0
PROCEEDINGS PAPER
Shakedown-Ratcheting Analysis of a Spherical Pressure Vessel by Anisotropic Continuum Damage Mechanics
Azam Surmiri,
Azam Surmiri
Shiraz University, Shiraz, Iran
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Hojjatollah Rokhgireh
Hojjatollah Rokhgireh
University of Larestan, Lar, Iran
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Ali Nayebi
Shiraz University, Shiraz, Iran
Azam Surmiri
Shiraz University, Shiraz, Iran
Hojjatollah Rokhgireh
University of Larestan, Lar, Iran
Paper No:
PVP2018-84065, V03BT03A032; 7 pages
Published Online:
October 26, 2018
Citation
Nayebi, A, Surmiri, A, & Rokhgireh, H. "Shakedown-Ratcheting Analysis of a Spherical Pressure Vessel by Anisotropic Continuum Damage Mechanics." Proceedings of the ASME 2018 Pressure Vessels and Piping Conference. Volume 3B: Design and Analysis. Prague, Czech Republic. July 15–20, 2018. V03BT03A032. ASME. https://doi.org/10.1115/PVP2018-84065
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