Nondestructive Measurement of Welding Residual Stresses by Acousto-Elastic Technique and Prediction of Fatigue Crack Growth

1992 ◽  
Vol 114 (4) ◽  
pp. 417-421 ◽  
Author(s):  
H. Kobayashi ◽  
Y. Arai ◽  
Y. Ohsawa ◽  
H. Nakamura ◽  
A. Todoroki
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Carbon Steel ◽  
Fatigue Crack Growth ◽  
Residual Stresses ◽  
Crack Growth ◽  
Material Anisotropy ◽  
Nondestructive Measurement ◽  
Superposition Technique ◽  
Nondestructive Measurements

Nondestructive measurements of residual stresses were successfully attempted by the acoustoelastic technique on butt-welded joints of a carbon steel for nuclear piping. Usefulness of the technique considering the effect of the material anisotropy is emphasized. Based on the measured residual stresses, predictions of the fatigue crack growth were done using the superposition technique. It is shown that predictions agree well with experiments. The effect of the accuracy in residual stress measurements on the predictions is also included.

Fatigue crack growth under residual stress field in low-carbon steel

1986 ◽  
Vol 94 (3) ◽  
pp. 241-247 ◽  
Author(s):  
H. Nakamura ◽  
E. Matsushima ◽  
A. Okamoto ◽  
T. Umemoto
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Carbon Steel ◽  
Fatigue Crack Growth ◽  
Stress Field ◽  
Crack Growth ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Residual Stress Field

Influence of Residual Stress Redistribution on Fatigue Crack Growth and Damage Tolerant Design

2006 ◽  
Vol 524-525 ◽  
pp. 363-372 ◽  
Author(s):  
Lyndon Edwards
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Residual Stresses ◽  
Crack Growth ◽  
Prediction Models ◽  
Damage Tolerance ◽  
Stress Redistribution ◽  
Initial Growth ◽  
Damage Tolerant

The safe operation of many structures and components is ensured through the operation of damage tolerant design and evaluation. Substantial residual stresses can exist in many systems and it is important that these are incorporated in damage tolerance calculations of fatigue crack growth. Recent improvements in non-destructive measurement techniques and in the application of weight or Green’s functions methods of including residual stress fields into stress intensity factor (SIF) calculations have enabled predictions of the effects of residual stresses on fatigue crack propagation to be made more readily. Two examples from the aerospace industry, structures containing (i) cold expanded holes and (ii) fusion welds are used to show that presently, although final crack growth lives can be accurately predicted, the details of crack growth are not well represented with initial growth typically being underestimated and later growth being over estimated. It is shown that this is most likely to be due to residual stress redistribution. and that this must be built into fatigue life prediction models if accurate damage tolerance based procedures are to be developed for components and systems containing substantial residual stresses.

On the Stress Intensity Factor of Cracks in Residual Stress Field

2007 ◽  
Vol 353-358 ◽  
pp. 1078-1081
Author(s):  
Liang Wang ◽  
Ya Zhi Li ◽  
Hong Su
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Stress Intensity ◽  
Fatigue Crack Growth ◽  
Stress Field ◽  
Residual Stresses ◽  
Weight Function ◽  
Crack Growth ◽  
Function Technique ◽  
Residual Stress Field

The use of weight function technique in fatigue crack growth subjected to external cyclic loading and residual stress field has been questioned by several researchers in that the technique is unable to account for the residual stress redistribution during the crack growth. In this paper a center cracked tension specimen containing residual stresses was analyzed by finite element method. The crack growth was simulated by releasing the nodes ahead of crack tip in stepwise and the stress intensity factors induced by residual stresses at different crack lengths were estimated. The results from the numerical analysis are identical to the weight function solution, which demonstrates that the weight function technique can be used for the fatigue crack growth analysis in residual stress field, unless the residual stress distribution is disturbed by the plastic yield.

ACCELERATION OF FATIGUE CRACK GROWTH AFTER OVERLOAD IN CARBON STEEL

2012 ◽  
Vol 06 ◽  
pp. 239-244
Author(s):  
A. YAMAUCHI ◽  
H. MIYAHARA ◽  
C. MAKABE ◽  
T. MIYAZAKI
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Carbon Steel ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Crack Opening ◽  
Growth Behavior ◽  
Residual Stress Distribution ◽  
Crack Growth Behavior ◽  
Fatigue Crack Growth Behavior

The effects of an overload on fatigue crack growth behavior have been investigated by using carbon steel. Delayed retardation and acceleration of crack growth were both observed. These phenomena depended not only on overload conditions but also on the baseline stress conditions. Moreover, the mechanical properties of the materials affected the crack growth rate after overload. It was found that crack growth accelerated when tensile residual stress was distributed in front of the crack tip. The residual stress distribution is related to the crack opening geometry at the overload stage.

Fatigue Crack Growth Modeling in Stiffened Panels Considering Residual Stress Effects

2010 ◽  
Vol 636-637 ◽  
pp. 1172-1177 ◽  
Author(s):  
Sérgio M.O. Tavares ◽  
Valentin Richter-Trummer ◽  
Pedro Miguel Guimarães Pires Moreira ◽  
Paulo Manuel Salgado Tavares de Castro
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Stress Field ◽  
Residual Stresses ◽  
Crack Growth ◽  
Initial Crack ◽  
Residual Stress Field ◽  
Stiffened Panels ◽  
Stiffened Structures

A model to determine Stress Intensity Factors (SIFs) and simulate the fatigue crack growth in stiffened structures taking into consideration residual stresses is presented in this paper. The stress field required to estimate the SIF was calculated using the Finite Element Method (FEM) considering the residual stress as an initial condition. The residual stress field redistribution as a function of crack growth is taken into account using the Abaqus software. Specimens without and with residual stresses, resulting from different welding techniques, were considered for the present study. The residual stress fields can significantly deteriorate or improve the fatigue life of the structure, depending upon the location of the initial crack; consequently these effects should be analyzed and modelled in order to better understand the consequences of the application of the considered manufacturing processes.

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