Analysis Of The Effects Of Process Parameters In Residual Stress Measurements On Titanium Plates By Hdm/Espi

Hole drilling (HDM) is the most widespread approach for measuring residual stress profile. Many improvements were introduced along the years. Recently, research papers investigated the feasibility of using optical systems to replace strain gage rosette as measurement tool of the strain field generated by the drilled hole. Generally, the accuracy of the measurement is influenced by the proper choice of the experimental and analysis parameters. In this paper the effects of the choice of a proper analysis area are shown. Furthermore the influence of the drilling rotation speed of the cutter used for drilling the hole is considered. Experimental tests were performed on a Ti6Al4V specimen loaded in a four point bending frame. Results obtained for different part of the analysis area and at different speeds ranging in 5000-50,000 rpm were compared with the theoretical expected value.