scholarly journals APPLICABILITY OF ENERGY RATE LINE INTEGRAL TO CREEP CRACK GROWTH

Fracture 84 ◽  
1984 ◽  
pp. 2191-2198
Author(s):  
V.M. Radhakrishnan
Keyword(s):  
Crack Growth ◽  
Creep Crack Growth ◽  
Line Integral ◽  
Energy Rate ◽  
Creep Crack

Life Estimation of Cracked Stainless Steel Components Under Creep Conditions

1991 ◽  
Vol 113 (3) ◽  
pp. 303-306 ◽  
Author(s):  
V. M. Radhakrishnan ◽  
M. Kamaraj ◽  
V. V. Balasubramaniam
Keyword(s):  
Stainless Steel ◽  
Crack Growth ◽  
Nuclear Power ◽  
State Energy ◽  
Creep Crack Growth ◽  
Experimental Investigations ◽  
Plane Stress Condition ◽  
Line Integral ◽  
Energy Rate ◽  
Creep Crack

Experimental investigations have been carried out to study the creep crack growth in types 316, 308 Cb, and 304 L stainless steel in the temperature range of 873–1073 K under plane stress condition. Testings have been carried out with both the base metal and the welded composite joints, because such joints are commonly used in nuclear power industries. Among the various parameters tried to correlate the creep crack growth, the energy rate line integral has been found to give the best description of the crack growth rate. The steady-state energy rate line integral has been found to correlate well with the rupture time. Based on this observation, life estimations are presented for thin components containing various initial defect sizes.

An Analysis of High-Temperature Crack Growth in Type 308 Cb Stainless Steel and Its Weldment

1991 ◽  
Vol 113 (4) ◽  
pp. 538-541
Author(s):  
V. M. Radhakrishnan ◽  
M. Kamaraj
Keyword(s):  
Stainless Steel ◽  
Crack Growth ◽  
Creep Crack Growth ◽  
Crack Growth Behavior ◽  
Plane Stress Condition ◽  
Line Integral ◽  
Steady State Condition ◽  
Energy Rate ◽  
Creep Crack ◽  
Type C

Creep crack growth behavior of type 308 Cb austenitic stainless steel and its weldment has been studied in the temperature range of 875 to 1075 K under plane stress condition. The creep crack growth (CCG) rate has been correlated with parameters like stress intensity factor, K, net section stress and energy rate line integral C*. Among these parameters C* appears to describe well the CCG rate in both the cases of base metal and weldment. The rupture time tr of the cracked material has been found to be related to the energy rate line integral C*s in the steady-state condition, given by a relation of the type C*s · tr = constant.

Estimation of Creep Crack Growth Properties Using Circumferential Notched Round Bar Specimen for 12CrWCoB Rotor Steel

2005 ◽  
Vol 297-300 ◽  
pp. 397-402
Author(s):  
Je Chang Ha ◽  
Joon Hyun Lee ◽  
Masaaki Tabuchi ◽  
A.Toshimitsu Yokobori Jr.
Keyword(s):  
Crack Growth ◽  
Axial Stress ◽  
Creep Crack Growth ◽  
Turbine Rotor ◽  
Rotor Steel ◽  
Creep Ductility ◽  
Crack Growth Behaviour ◽  
Creep Crack ◽  
Round Bar ◽  
Growth Properties

Most heat resisting materials in structural components are used under multi-axial stress conditions and under such conditions ductile materials often exhibit brittle manner and low creep ductility at elevated temperature. Creep crack initiation and growth properties are also affected by multi-axial stress and it is important to evaluate these effects when laboratory data are applied to structural components. Creep crack growth tests using circumferential notched round bar specimens are a simple method to investigate multi-axial stress effects without using complicated test facilities. Creep crack growth tests have been performed using a 12CrWCoB turbine rotor steel. In order to investigate the effects of multi-axial stress on creep crack growth properties, the tests were conducted for various notch depths at 650°C. The circumferential notched round bar specimen showed brittle crack growth behaviour under multi-axial stress conditions. Creep crack growth rate was characterized in terms of the C* parameter. A 12CrWCoB turbine rotor steel has been tested using circumferential notched round bar specimens with different multi-axiality. Circumferential notched round bar specimens show increased brittle creep crack growth behaviour due to the multi-axial stress condition. Creep crack growth properties could be predicted by allowing for the decrease of creep ductility under multi-axial conditions.

Creep crack growth in internally pressurised tubes

1998 ◽  
Vol 15 (3-4) ◽  
pp. 225-230 ◽  
Author(s):  
R. V. Maskell ◽  
A. Fleming ◽  
P. J. Crawford ◽  
L. W. Buchanan
Keyword(s):  
Crack Growth ◽  
Creep Crack Growth ◽  
Creep Crack
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