Fracture mechanics analysis of stable crack growth under sustained load and instability of circumferential cracks in straight water-steam pipes

1983 ◽  
Vol 11 (2) ◽  
pp. 65-79
Author(s):  
U. Brenner ◽  
H.D. Schulze ◽  
G. Gnirβ
Keyword(s):  
Fracture Mechanics ◽  
Crack Growth ◽  
Stable Crack Growth ◽  
Sustained Load ◽  
Water Steam ◽  
Mechanics Analysis ◽  
Steam Pipes

Large stable crack growth in fracture mechanics specimens

1994 ◽  
Vol 151 (2-3) ◽  
pp. 387-400 ◽  
Author(s):  
W. Brocks ◽  
A. Eberle ◽  
S. Fricke ◽  
H. Veith
Keyword(s):  
Fracture Mechanics ◽  
Crack Growth ◽  
Stable Crack Growth

Embedded Crack Treatments and Fracture Toughness Evaluation Methods in Probabilistic Fracture Mechanics Analysis Code for the PTS Analysis of RPV

2004 ◽  
Author(s):  
Kunio Onizawa ◽  
Katsuyuki Shibata ◽  
Masahide Suzuki ◽  
Daisuke Kato ◽  
Yinsheng Li
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Crack Growth ◽  
Treatment Method ◽  
Evaluation Methods ◽  
Probabilistic Fracture Mechanics ◽  
Mechanics Analysis ◽  
Toughness Evaluation ◽  
Embedded Crack ◽  
Fracture Toughness Evaluation

Using the probabilistic fracture mechanics analysis code PASCAL, we studied the treatment method of an embedded crack and the fracture toughness evaluation methods on the probability of crack initiation and fracture of a reactor pressure vessel (RPV). For calculating the stress intensity factor (SIF) of an embedded crack, the ASME and CRIEPI procedures were introduced into the PASCAL code. The CRIEPI method enables us to calculate the SIF values at three points on the crack tip. Under a severe pressurized thermal shock (PTS) condition, the crack growth analysis methods with different SIF calculation points and crack growth directions are compared. To evaluate precisely the fracture toughness after neutron irradiation, the new fracture toughness curves based on the Weibull distribution were incorporated into the PASCAL code. The calculated results with these new curves showed little difference in the conditional probabilities of RPV fracture as compared to the curve currently used in the U.S.

Application of 3D Fracture Mechanics for Improved Crack Growth Predictions of Gas Turbine Components

2017 ◽  
Author(s):  
Kanwardeep S. Bhachu ◽  
Santosh B. Narasimhachary ◽  
Sachin R. Shinde ◽  
Phillip W. Gravett
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Fracture Mechanics ◽  
Intensity Factor ◽  
Gas Turbine ◽  
Crack Growth ◽  
Structural Integrity ◽  
Crack Arrest ◽  
3D Crack Growth ◽  
Mechanics Analysis

Fracture mechanics analysis is essential for demonstrating structural integrity of gas turbine components. Usually, analyses based on simpler 2D stress intensity solutions provide reasonable approximations of crack growth. However, in some cases, simpler 2D solutions are too-conservative and does not provide realistic crack growth predictions; often due to its inability to account for actual 3D geometry, and complex thermal-mechanical stress fields. In such cases, 3D fracture mechanics analysis provides extra fidelity to crack growth predictions due to increased accuracy of the stress intensity factor calculations. Improved fidelity often leads to benefits for gas turbine components by reducing design margins, improving engine efficiency, and decreasing life cycle costs. In this paper, the application of 3D fracture mechanics analysis on a gas turbine blade for predicting crack arrest is presented. A comparison of stress intensity factor values from 3D and 2D analysis is also shown. The 3D crack growth analysis was performed by using FRANC3D in conjunction with ANSYS.

scholarly journals Fracture mechanics analysis on stress corrosion crack growth in Zircaloy-2.

1984 ◽  
Vol 26 (12) ◽  
pp. 1072-1082
Author(s):  
Seiji NISHIMURA ◽  
Sachio SHIMADA ◽  
Masayuki NAGAI ◽  
Kagetaka AMANO ◽  
Genki YAGAWA
Keyword(s):  
Fracture Mechanics ◽  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
Crack Growth ◽  
Mechanics Analysis ◽  
Stress Corrosion Crack Growth

A Plastic Fracture Mechanics Prediction of Fracture Instability in a Circumferentially Cracked Pipe in Bending—Part I: J-Integral Analysis

1981 ◽  
Vol 103 (4) ◽  
pp. 352-358 ◽  
Author(s):  
A. Zahoor ◽  
M. F. Kanninen
Keyword(s):  
Fracture Mechanics ◽  
Ductile Fracture ◽  
Crack Growth ◽  
Stable Crack Growth ◽  
Piping System ◽  
J Integral ◽  
Resistance Curve ◽  
Integral Analysis ◽  
Circumferential Crack ◽  
Fracture Instability

A method of evaluating the J-integral for a circumferentially cracked pipe in bending is proposed. The method allows a J-resistance curve to be evaluated directly from the load-displacement record obtained in a pipe fracture experiment. This method also permits an analysis for fracture instability in a circumferential crack growth using a J-resistance curve and the tearing modulus parameter. The influence of the system compliance on fracture instability is discussed in conjunction with the latter application. The results suggest that a compliant piping system containing a crack can exhibit ductile fracture instability after some stable crack growth. The importance of using a J-resistance curve that is consistent with the type of constraint for a given application is emphasized.

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