The Ratcheting Behaviour of Stainless Steel Pressurized Piping Elbows Subjected to Dynamic Out-of-Plane MomentsReport as inadecuate




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In this paper the ratchetingbehavior of four pairs of stainless steel elbows is studied under conditions ofsteady internal pressure and dynamic conditions that induced out-of-plane externalmoments at frequencies typical of seismic excitations. The finite elementanalysis with the nonlinear kinematic hardening model has been used to evaluateratcheting behavior of the piping elbows under mentioned loading condition.Material parameters have been obtained from several stabilized cycles ofspecimens that are subjected to symmetric strain cycles. The direction ofmaximum strain is at about 45° between the hoop and axialdirections. The results show that the direction of highest ratcheting is alongthe hoop direction rather than the direction of maximum principal strain. Also, the initial rate of ratcheting is large and thenit decreases with the increasing cycles. Also, the FE method gives overestimated values compared with the experimental data.

KEYWORDS

Stainless steel, Piping Elbows, Ratcheting, Kinematic Hardening Model, Out-of-Plane Moment

Cite this paper

Zakavi, S. and Nourbakhsh, M. 2014 The Ratcheting Behaviour of Stainless Steel Pressurized Piping Elbows Subjected to Dynamic Out-of-Plane Moments. Modern Mechanical Engineering, 4, 125-132. doi: 10.4236-mme.2014.43012.





Author: S. J. Zakavi, M. Nourbakhsh

Source: http://www.scirp.org/



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