Method for measuring stress of pressureconduit

The invention relates to a method for measuring the stress of a pressureconduit. The method comprises the following steps that the stress of the pressureconduit is measured through a dynamometer, and the strain of the pressureconduit is measured through an optical gratingdemodulator; first correction parameters and second correction parameters are calculated by utilizing the stress measured by the dynamometer and the strain measured by the optical gratingdemodulator; a pressure detection model is established by utilizing the first correction parameters and the second correction parameters. In actual detection, the radial force and axial force exerted to the pressureconduit are calculated by utilizing the pressureconduitstress measured by the dynamometer and the pressure detection model, and a resultant force exerted to the pressureconduit is calculated. The method can accurately, simply and rapidly detect the stress of the pressureconduit.