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Analysis of Procedures for the Determination of the Yield Force (F gy ) for Instrumented Sub-Sized Charpy-V Specimens

A method for the determination of the yield force (F g y ) is defined in Annex D of the Draft Standard for impact Testing of Sub-Sized Charpy Specimens [1]. The procedure describes an iterative method for finding the straight line (Hooke's line) in the initial part of the force-displacement curve. F g y is then taken as the point of intersection of this line with a fitted line through the fully plastic range of the data. This method is applied to force-time data collected during Phase 1 of a Round-Robin [2] to validate the Proposed Standard. Analysis of the results shows that a modification to the procedure improves the reliability of the method for finding the F g y values.