초록 ▼

A method of prestressing the working surface of pressure chambers or cylinders comprising the steps of first shot peening their working surfaces to form compressive residual stresses, and then applying fluid pressure at a predetermined magnitude to cause tensile stresses in the working surfaces. The

A method of prestressing the working surface of pressure chambers or cylinders comprising the steps of first shot peening their working surfaces to form compressive residual stresses, and then applying fluid pressure at a predetermined magnitude to cause tensile stresses in the working surfaces. The magnitude of compressive residual stresses established on their outer working surfaces is made substantially equal to the tensile stress applied to these surfaces during the pressure phase of the process.

대표청구항 ▼

A method of prestressing the inner working surfaces of the walls forming a pressure chamber comprising the steps of: (a) shot peening the inner working surfaces of said walls of said pressure chamber; (b) sealing said pressure chamber and applying a fluid pressure in the chamber of a magnitude suffi

A method of prestressing the inner working surfaces of the walls forming a pressure chamber comprising the steps of: (a) shot peening the inner working surfaces of said walls of said pressure chamber; (b) sealing said pressure chamber and applying a fluid pressure in the chamber of a magnitude sufficient to deform the said walls defining said chamber beyond the yield strength but not sufficient to cause fracture of said walls, and (c) releasing such applied fluid pressure and unsealing said pressure chamber.