TWI Industrial Member Report Summary 955b/2010
By S Smith and S Maddox
The present Group Sponsored Project (GSP) has two overlapping aims. First, finite element analysis (FEA) of structures is being done to find accurate and robust schemes for calculating the structural stress (SS). Second, the analysis results are being used to redefine the weld fatigue categories of BS 7608 by plotting them in terms of the SS rather than a local nominal stress (SN). The values of SS and SN are the same for some specimen types, so it is assumed that the S-N curve of these specimens might represent the curve achieved when all specimen results are presented in terms of their SS.
The present report contains TWI's draft proposal for revision of BS 7608. Another GSP report issued together with the present report describes the background to some of the content of the draft standard (Smith and Maddox, 2008).
The objective of the current report is to present TWI proposals for a revised version of BS 7608 based on the findings to date of the GSP.