0
Research Papers: Materials and Fabrication

Computational and Experimental Studies of High Temperature Crack Initiation in the Presence of Residual Stress

[+] Author and Article Information
Noel P. O’Dowd

Department of Mechanical and Aeronautical Engineering, Materials and Surface Science Institute,  University of Limerick, Limerick, Ireland

Kamran M. Nikbin

Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK

Robert C. Wimpory

 Hahn-Meitner Institut, Glienicker Strasse 100, D-14109 Berlin, Germany

Farid R. Biglari

Department of Mechanical Engineering, Amirkabir University of Technology, Hafez Avenue, Tehran, Iran

Manus P. O’Donnell

 British Energy Generation Ltd., Barnett Way, Barnwood, Gloucester GL4 3RS, UK

J. Pressure Vessel Technol 130(4), 041403 (Aug 22, 2008) (7 pages) doi:10.1115/1.2967831 History: Received October 27, 2006; Revised June 19, 2007; Published August 22, 2008

Residual stresses have been introduced into a notched compact tension specimen of a 347 weld material by mechanical compression. The required level of compressive load has previously been determined from finite-element studies. The residual stress in the vicinity of the notch root has been measured using neutron diffraction and the results compared with those obtained from finite-element analysis. The effect of stress redistribution due to creep has been examined and it is found that a significant reduction in stress is measured after 1000h at 650°C. The implications of these results with regard to the development of damage in the specimen due to creep relaxation are examined.

Copyright © 2008 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Schematic of compact tension specimen

Grahic Jump Location
Figure 2

Tensile data for the 347 MMA weld steel

Grahic Jump Location
Figure 3

Predicted creep response of the material

Grahic Jump Location
Figure 4

Finite element mesh of the C(T) specimen

Grahic Jump Location
Figure 5

Load-displacement curve during the compression of the notched specimen

Grahic Jump Location
Figure 6

Comparison of the experimental data and FE predictions for the back-face strain (see Fig. 1)

Grahic Jump Location
Figure 7

Residual stress profiles obtained from the finite-element analysis

Grahic Jump Location
Figure 8

Comparison of the plane strain and plane stress finite-element solutions with the 3D solutions

Grahic Jump Location
Figure 9

Comparison between the finite-element and the measured residual stresses

Grahic Jump Location
Figure 10

Prediction between the numerical and experimental stresses: (a) hydrostatic and (b) equivalent (von Mises) stresses

Grahic Jump Location
Figure 11

Evolution of notch stress in the specimen

Grahic Jump Location
Figure 12

Comparison of stress distribution following creep for two different creep models

Grahic Jump Location
Figure 13

Residual stress at the central line following creep at 650°C

Grahic Jump Location
Figure 14

Measured residual stress following precompression and after 1000h at 650°C

Grahic Jump Location
Figure 15

Stress triaxiality following precompression and after 1000h at 650°C

Grahic Jump Location
Figure 16

Damage (normalized by the uniaxial failure strain) ahead of the notch after 1000h at 650°C

Grahic Jump Location
Figure 17

Predicted fracture surface for the notched specimen for εf=1%

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In