The autofrettage process is used widely to introduce residual stresses into thick walled tubes. Traditionally residual stresses have been measured using the Sachs method. In this paper we describe the application of the novel deep-hole technique to measure residual stresses in an autofrettaged steel tube. The tubel wall thickness was 17 mm (0.669 inch) and outside diameter 67 mm (2.6378 inch). The results obtaiendusing the deep-hole technique are compared with results obtained using Sachs' method. Also presented are results from a finite element (FE)simulation. The FE analysis is used to simulate the generation of the residual stresses by autofrettage. A simulation of the steps used in the deep-hole technique then follows this.The results illustrate good agreement with the experimens. The results presented in this paper are for residual stresses in a component with a relatively simple shape. The experimental and FE results demonstrate also that the deep-hole technique is a powerful experimental method for measuring residual stresses in components of more complex shape, such as tube intersections.
展开▼
