Specimen geometry effect on creep crack growth in 316L(N)

2006 ◽  
Vol 29 (2) ◽  
pp. 145-155 ◽  
Author(s):  
L. LAIARINANDRASANA ◽  
R. KABIRI
Keyword(s):  
Crack Growth ◽  
Creep Crack Growth ◽  
Specimen Geometry ◽  
Geometry Effect ◽  
Creep Crack

Specimen Geometry and Size Effects on the Creep Crack Growth Behaviour of P91 Weldments

2013 ◽  
Author(s):  
A. Mehmanparast ◽  
S. Maleki ◽  
M. Yatomi ◽  
K. M. Nikbin
Keyword(s):  
Crack Growth ◽  
Elevated Temperatures ◽  
Creep Crack Growth ◽  
Compact Tension ◽  
Initial Crack ◽  
Parent Material ◽  
Specimen Geometry ◽  
Crack Growth Behaviour ◽  
Creep Crack ◽  
Constraint Effects

The influence of specimen size and geometry on the creep crack growth (CCG) behaviour of P91 parent and weld materials at 600–625 °C has been examined. CCG tests have been performed on compact tension, C(T), specimens with an initial crack located in the heat affected zone (HAZ). Further tests have also been performed on specimens made of parent material (PM). Higher creep crack growth rates have been found in the HAZ material compared to the PM when the CCG rate is characterized using the C* fracture mechanics parameter. The experimental data from these tests are compared to those of available from specimens with different size and geometries. The results are discussed in terms of specimen geometry and constraint effects on the CCG behaviour of P91 weldments at elevated temperatures.

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
Sign in / Sign up

Export Citation Format

Share Document