کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
787818 | 1466076 | 2014 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: J-integral analysis of heterogeneous mismatched girth welds in clamped single-edge notched tension specimens J-integral analysis of heterogeneous mismatched girth welds in clamped single-edge notched tension specimens](/preview/png/787818.png)
• We present a crack driving force estimation procedure for heterogeneous welds.
• The procedure is based on a ‘homogenized’ version of the EPRI equation.
• Complex welds are translated into equivalent idealized mismatched welds.
• The procedure is validated for clamped SE(T) specimens.
• A mismatch limit load for clamped SE(T) specimens is developed.
Flaw assessment procedures require a quantification of crack driving force, and such procedures are generally based on the assumption of weld homogeneity. However, welds generally have a heterogeneous microstructure, which will influence the crack driving force. This paper describes a stress-based methodology to assess complex heterogeneous welds using a J-based approach. Clamped single-edge notched tension specimens, representative of girth weld flaws, are analyzed and the influence of weld heterogeneity on crack driving force has been determined. The use of a modified limit load for heterogeneous welds is proposed, suitable for implementation in a ‘homogenized’ J-integral estimation scheme. It follows from an explicit modification of an existing solution for centre cracked tension specimens. The proposed solution provides a good estimate of crack driving force and any errors in the approximation may be accounted for by means of a small safety factor on load bearing capacity.
Journal: International Journal of Pressure Vessels and Piping - Volume 119, July 2014, Pages 95–107