Volume 22, Issue 7 (July 2022)                   Modares Mechanical Engineering 2022, 22(7): 461-471 | Back to browse issues page

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Zakavi S J, Bakhshipour E. The Effect of Temperature and Bending Moments on the Strain Accumulation of Carbon Steel Piping Branch. Modares Mechanical Engineering 2022; 22 (7) :461-471
URL: http://mme.modares.ac.ir/article-15-58971-en.html
1- University of Mohaghegh Ardabili , zakavi@uma.ac.ir
2- University of Mohaghegh Ardabili
Abstract:   (852 Views)
In this paper, by using the Chaboche kinematic hardening model with the isotropic hardening law, the effect of temperature and bending moments is investigated on the strain accumulation behavior of carbon steel piping branch. Carbon steel branch junctions under internal pressure and temperature with dynamic bending moment are tested at five temperatures of 20, 50, 100, 150 and 200 ° C. The results obtained by numerical analysis show that the highest amount of ratcheting occurred near the branch junctions in the circumferential direction. The strain ratcheting occurred mainly because of dynamic moments and high temperatures. The results show that in all three samples, the amount of strain ratcheting increases with increasing of dynamic moment level and temperature. With increasing of the ratio of diameter to thickness in branch junctions, the onset of strain accumulation occurs at low moment levels. It can be concluded that initially, the rate of strain ratcheting is high and with the increase of loading cycles, this rate decreased due to the strain hardening phenomenon. The increase of strain ratcheting at high temperatures is due creep strain because of high temperature and mainly accumulated plastic strain under dynamic bending moments because of cyclic plasticity.
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Article Type: Original Research | Subject: Plasticity
Received: 2022/01/24 | Accepted: 2022/04/4 | Published: 2022/07/1

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