Upcoming Standard Test Method for Determining Residual Stresses by the Incremental Slitting Method

• 2009: submit the draft standard for approval by ASTM
• 2010: begin on the inter-laboratory repeatability study that needs to be completed within 5 years if issuing the standard.

Currently, the basic procedure for calculating stresses in the standard is that described in the Do it Yourself section of the Help and Resources page. A good experimental procedure is given in the experimental procedure report (LA-UR-03-8629).

• The standard will cover through-thickness measurements as compared to near surface
• This will complement rather than compete with E897, the hole drilling standard.
• Through-thickness measurements are simpler calculationally and less sensitive to stresses induced by cutting.
  
• The standard will cover the beam/plate geometry and the rod/disk geometry
• The stresses will be calculated using the series expansion approach. A table of compliances will be provided for each geometry.

Completed work:

• May 2002: at committee week in Pittsburgh, the results of a blind round robin were presented and discussed. The round robin was on calculation procedures, and all participants  used the same sets of actual experimental data.
• January 2003: the task group, working independently at home institutions and communicating electronically, completed a first draft of the standard.
  
• April 2003: at Task Group meeting was held in Davis to substantially revise the draft standard and to outline the remaining steps to finish the standard. Next up is a large set of calculations to determine the range of applicability of the standard such that a minimum bias (error) can be expected.
• May 2004: a Task Group meeting was held during committee week in Utah. Much progress was reported on the calculations to examine errors that might be expected if one standard table of calibration coefficients are used. The remaining tasks to be completed were assigned to Task Group members.
• November 2005: a meeting was held in Los Alamos. The final efforts required to complete the standard were identified and assigned.

Task Group: