Cyclic plastic deformation behaviour of PHT piping materials - an experimental investigation

Sivaprasad, S and Paul, Surajit K and Tarafder, S and Gupta, Suneel K and Bhasin, Vivek (2011) Cyclic plastic deformation behaviour of PHT piping materials - an experimental investigation. In: 21st International Conference on Structural Mechanics in Reactor Technology (SMiRT 21), 6-11 November, 2011, New Delhi, India .

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The work presents the cyclic plastic deformation behaviour of two varieties of primary heat transport piping materials to understand the hardening/softening behaviour, load history memory, strain range effect, mean stress effect and ratcheting behaviour. Microstructural changes during cyclic deformation manifest in cyclic expansion of yield that could be used to explain the hardening/softening behaviour. Both the materials memories the prior history, however, the effect disappears after some time. Both the steels exhibit non-Masing behaviour due to inhomogeneous substructural changes. Non-Masing behaviour could be explained through cyclic expansion of yield. Engineering stress controlled ratcheting experiments were noted to be inadequate and under predict the ratcheting fatigue life. Importance of true stress controlled ratcheting experiments were discussed.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:Cyclic plastic deformation; Stainless steel 304LN; C-Mn steel SA333; Masing behaviour; Dislocation cells
Divisions:Material Science and Technology
ID Code:4627
Deposited By:Dr S Tarafder
Deposited On:19 Jan 2012 13:38
Last Modified:19 Jan 2012 13:38
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