Modelling Incremental Hole Drilling for Residual Stress Analysis of AA7050-T7451 Specimen

Incremental hole drilling is widely used technique to measure the surface residual stresses due to its high precision and being economic. In Incremental hole drilling process, a rosette is installed having capability of measuring multi directional strain, a hole is drilled in the center through a successive increments and surface stress stresses are monitored. This incremental hole drilling methodology converts the relaxed strain induced by the hole drilling into a sub-surface stresses which is the measured by the installed rosette gauge. Experimentally at the position of the hole drilling, a rosette with 3 different gauges arranged at 00, 450 and 90. Stress maximum when the angle of applied load is parallel to direction of stress measurement. While it is found to be almost negligible for the other 2 orientations