An Assessment of Techniques of Analysis of Creep Crack-Growth Test-Record by J*-Integral

1981 ◽  
pp. 611-612
Author(s):  
G. G. Musicco ◽  
G. Bernasconi ◽  
G. Piatti
Keyword(s):  
Crack Growth ◽  
Creep Crack Growth ◽  
J Integral ◽  
Creep Crack ◽  
Growth Test ◽  
Test Record

scholarly journals Creep Crack Growth Test Method and Creep Crack Growth Properties for TiAl Intermetallic Compound.

2000 ◽  
Vol 49 (1) ◽  
pp. 80-85 ◽  
Author(s):  
Masaaki TABUCHI ◽  
Toshimitu YOKOBORI ◽  
Akio FUJI ◽  
Kiyoshi KUBO ◽  
Koichi YAGI ◽  
...  
Keyword(s):  
Intermetallic Compound ◽  
Crack Growth ◽  
Creep Crack Growth ◽  
Test Method ◽  
Creep Crack ◽  
Growth Test ◽  
Tial Intermetallic Compound ◽  
Growth Properties

GS12 Characterization of side-groove geometry of C(T) specimen used for creep crack growth test based on micro damage mechanics

2014 ◽  
Vol 2014 (0) ◽  
pp. _GS12-1_-_GS12-3_
Author(s):  
Takahiro FUKUDA ◽  
Haruhisa SHIGEYAMA ◽  
A. Toshimitsu YOKOBORI Jr. ◽  
Ryuji SGIURA
Keyword(s):  
Crack Growth ◽  
Damage Mechanics ◽  
Creep Crack Growth ◽  
Creep Crack ◽  
Growth Test

scholarly journals Study of cavities in a creep crack growth test specimen

2016 ◽  
Vol 2 ◽  
pp. 942-949 ◽  
Author(s):  
H Jazaeri ◽  
P J Bouchard ◽  
M T Hutchings ◽  
A A Mamun ◽  
R K Heenan
Keyword(s):  
Crack Growth ◽  
Test Specimen ◽  
Creep Crack Growth ◽  
Creep Crack ◽  
Growth Test

Assessment of Fully Plastic J and C*-Integral Solutions for Application to Elastic-Plastic Fracture and Creep Crack Growth

1993 ◽  
Vol 115 (3) ◽  
pp. 228-234 ◽  
Author(s):  
D. R. Lee ◽  
J. M. Bloom
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Driving Force ◽  
Creep Crack Growth ◽  
J Integral ◽  
Finite Element Program ◽  
Hardening Material ◽  
Crack Driving Force ◽  
Elastic Plastic ◽  
Creep Crack

A critical part of the assessment of defects in power plant components, both fossil and nuclear, is the knowledge of the crack driving force (K1, J, or C*). While the determination of the crack driving force is possible using finite element analyses, crack growth analyses using finite element methods can be expensive. Based on work by Il’yushin, it has been shown that for a power law hardening material, the fully plastic portion of the J-integral (or the C*-integral) is directly related to an h1 calibration function. The value of h1 is a function of the geometry and hardening exponent. The finite element program ABAQUS was used to evaluate the fully plastic J-integral and determine the h1 functions for various geometries. The Ramberg-Osgood deformation theory plasticity model, which may be used with the J-integral evaluation capability, allows the evaluation of fully plastic J solutions. Once it was established that the grid used to generate the h1 functions was adequate (based on the more recent work of Shih and Goan), additional runs were made of other configurations given in the EPRI Elastic-Plastic Fracture Handbook. Differences as great as 55 percent were found when compared to results given in the Handbook (single-edge crack plate under tension and plane stress with a/b = 0.5). Effects of errors in h1 on predicted failure load and creep crack growth are discussed.

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.

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