The use of thin cuts for residual stress measurement is referred to as the crack compliance method. A computational model is presented for the determination of normal and shear residual stresses near the surface by introducing shallow cuts. The optimum regions for strain measurement are obtained. This method is shown to be considerably more sensitive than the conventional hole drilling method and is capable of measuring residual stresses which vary with depth below the surface.
Macroscopic residual stresses in layered composites were investigated by paying particular attention to implement a reliable experimental technique for the measurement of through-the-thickness residual stresses in layered composite plates. Residual stresses in (010/9010) S APC-2 laminate have been measured by two experimental techniques, i.e., by layer removal method, and by compliance method. The latter has been successfully employed up to date for the measurement of residual stresses in isotropic materials and the authors propose an extension of the method's use to layered orthotropic composites. The data obtained by the layer removal and compliance methods are compared to the results obtained by a numerical model developed by other researchers. There is an excellent agreement between the experimental data obtained by the layer removal and compliance methods and the results predicted by the model. The layer removal and compliance methods are also compared in terms of accuracy and practicality.
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