Application of Obliquely Mounted Strain Gage to Measurement of Residual Stresses in Disks

Résumé du livre

A simple method is presented whereby the residual stress distribution in a disk can be determined with the air of the obliquely mounted strain gage when the directions of the principal stresses are radial and tangential. The strain gages are mounted in such a way as to make them sensitive only to the tangential stresses in the disk. The disk is then cut so as to relieve completely the residual tangential stresses, and the strain gages therefore indicate directly the residual tangential stresses that were present in the disk. This procedure consists of making several preliminary radial saw cuts to reduce the over-all residual stress level and then one final diametral saw cut adjacent to the mounted strain gages through the plane where the residual tangential stress is desired. The residual stress distribution is calculated from the measured tangential stresses by using the equilibrium equation for a disk.