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Uniaxial and biaxial ratchetting study of SA333 Gr.6 steel at room temperature

DSpace at IIT Bombay

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Title Uniaxial and biaxial ratchetting study of SA333 Gr.6 steel at room temperature
 
Creator KULKARNI, SC
DESAI, YM
KANT, TARUN
REDDY, GR
PARULEKAR, Y
VAZE, KK
 
Subject fatigue of materials
deformation
cyclic loads
pressure effects
plasticity
 
Description The phenomenon of ratchetting is defined as constant accumulation of plastic strain or deformation under combined steady state and cyclic loading. It can reduce the fatigue life or can cause failure of piping components or systems subjected to seismic or other cyclic loads. The uniaxial ratchetting characteristics of SA333 Gr.6 steel have been investigated at room temperature in the present paper. The specimens were subjected to cyclic axial stress with a constant mean stress of 200 MPa and a varying amplitude stress of 149, 174, 199 and 224 MPa. Tests were also performed on 203.2 mm, Sch 80, SA333 Gr. 6 carbon steel straight pipe. The pipe was subjected to a constant internal pressure of 18 MPa and a cyclic bending load. The effects of amplitude of load on the rate of ratchetting have also been investigated in the present paper. The uniaxial experiments showed that specimens exhibited shakedown at low stress amplitude after some strain accumulation. However, specimens experienced continuous ratchetting at higher stress amplitudes with no shakedown before failure. Ovalization of the pipe cross-section was observed when the pipe was subjected to constant internal pressure and cyclic point load. Local bulging was observed at higher loading. The pipe did not show any shakedown behaviour for the given cycles of loading and exhibited continuous ratchetting under the varying amplitude loading.
 
Publisher Elsevier
 
Date 2009-05-08T02:40:38Z
2011-12-08T07:02:03Z
2011-12-26T13:01:55Z
2011-12-27T05:47:40Z
2009-05-08T02:40:38Z
2011-12-08T07:02:03Z
2011-12-26T13:01:55Z
2011-12-27T05:47:40Z
2003
 
Type Article
 
Identifier International Journal of Pressure Vessels and Piping 80(3), 179-185
0308-0161
10.1016/S0308-0161(03)00029-2
http://hdl.handle.net/10054/1314
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1314
 
Language en