Recent studies have shown that a subcritical surface crack, due to primary water stress corrosion cracking (PWSCC), can transition to a through-wall crack (TWC) with significant differences between the inner diameter (ID) and outer diameter (OD) crack lengths. This behavior has been observed for both circumferential and axial cracks. Recently, a surface to TWC transition model has been developed for circumferential cracks using existing K and COD (crack opening displacement) solutions for nonidealized circumferential TWCs. In this paper, a similar crack transition model (CTM) was developed for axial cracks. As a first step, a study was conducted to define the appropriate crack front shape for nonidealized axial TWCs. Then, elastic finite element analyses were carried out to develop K and COD solutions using these crack front shapes. The newly developed solutions were utilized for the CTM. The present CTM includes a criterion for transitioning the final surface crack to the initial nonidealized TWC. This criterion determines when the transition should occur (based on surface crack depth) and determines the two crack lengths (at ID and OD surfaces) of the initial nonidealized TWC. Furthermore, nonidealized TWC growth calculation can be conducted using the proposed model. Example results (crack length and COD) obtained from the proposed model were compared to those obtained from the natural crack growth simulations. Results presented in this paper demonstrated the applicability of the proposed model for simulating axial crack transition.

References

References
1.
Rudland
,
D. L.
,
Shim
,
D.-J.
,
Zhang
,
T.
, and
Wilkowski
,
G.
,
2007
, “
Implications of Wolf Creek Indications—Final Report
,” Program Final Report to the NRC, Report No. ADAMS ML072470394.
2.
Electric Power Research Institute,
2007
, “
Advanced FEA Evaluation of Growth of Postulated Circumferential PWSCC Flaws in Pressurizer Nozzle Dissimilar Metal Welds
,” Materials Reliability Program, Palo Alto, CA, Report No. 1015383.
3.
Rudland
,
D.
,
Csontos
,
A.
, and
Shim
,
D.-J.
,
2010
, “
Stress Corrosion Crack Shape Development Using AFEA
,”
ASME J. Pressure Vessel Technol.
,
132
(
1
), p.
011406
.
4.
Shim
,
D.-J.
,
Rudland
,
D.
, and
Harris
,
D.
,
2011
, “
Modeling of Subcritical Crack Growth Due to Stress Corrosion Cracking—Transition From Surface Crack to Through-Wall Crack
,”
ASME
Paper No. PVP2011-57267.
5.
Shim
,
D.-J.
,
Kurth
,
R.
, and
Rudland
,
D.
,
2013
, “
Development of Non-Idealized Surface to Through-Wall Crack Transition Model
,”
ASME
Paper No. PVP2013-97092.
6.
Huh
,
N.-S.
,
Shim
,
D.-J.
,
Choi
,
S.
, and
Park
,
K.-B.
,
2008
, “
Stress Intensity Factors and Crack Opening Displacements for Slanted Axial Through-Wall Cracks in Pressurized Pipes
,”
Fatigue Fract. Eng. Mater. Struct.
,
31
(
6
), pp.
428
440
.
7.
Electric Power Research Institute,
2004
, “
Crack Growth Rates for Evaluating Primary Water Stress Corrosion Cracking (PWSCC) of Alloy 82, 182, and 132 Welds
,” Materials Reliability Program, Palo Alto, CA, Report No. 1006696.
8.
ABAQUS
,
2012
, ABAQUS Version 6.11, SIMULIA, Providence, RI.
9.
Nakamura
,
T.
, and
Parks
,
D. M.
,
1992
, “
Determination of Elastic T-Stress Along 3-D Crack Fronts Using an Interaction Integral
,”
Int. J. Solids Struct.
,
29
(
13
), pp.
1597
1611
.
10.
Zahoor
,
A.
,
1991
,
Ductile Fracture Handbook
,
Electric Power Research Institute
,
Palo Alto, CA
.
11.
France
,
C. C.
,
Green
,
D.
,
Sharples
,
J. K.
, and
Chivers
,
T. C.
,
1997
, “
New Stress Intensity Factor and Crack Opening Area Solutions for Through-Wall Cracks in Pipes and Cylinders
,”
ASME Pressure Vessels and Piping Conference
, Vol.
350
, pp. 143–195.
12.
British Energy Generation Ltd., 2001,
R6—Assessment of the Integrity of Structures Containing Defects, Rev. 4
,
EDF Energy Nuclear Generation Ltd.
, Gloucester, UK.
You do not currently have access to this content.