Measurement method of circumferential elastic modulus and Poisson's ratio of pipe

Abstract

The invention discloses a method for measuring the circumferential elastic modulus and Poisson's ratio of a pipe, which comprises the following steps: S1, measuring the outer diameters of the two ends of the pipe to be measured and the three axial positions in the middle, and taking an arithmetic mean value; Measure the inner diameters at both ends of the pipe to be tested, and take the arithmetic mean value to obtain the outer diameter R of the pipe to be tested 0 and inner diameter R in and the thickness t; S2. Measure the axial deformation and lateral deformation of the pipe to be tested under different internal pressure loads θ ; S3, by graphical method or fitting method, obtain the circumferential elastic modulus E of the pipe to be measured according to formula (1) 1 , according to formula (2) to obtain the Poisson's ratio ν of the pipe to be tested. The invention is suitable for measuring the circumferential elastic modulus and Poisson's ratio of thin-walled circular pipes, and solves the problem that the circumferential elastic modulus and Poisson's ratio are difficult to measure as non-standard experiments; the measured circumferential elastic modulus and Poisson's ratio It can completely evaluate the deformation performance of the pipe, calculate the elastic deformation of the pipe, and provide reference for the design, calculation and verification of the fuel assembly.

Description

technical field [0001] The invention relates to the technical field of cladding tube measurement in reactors, in particular to a method for measuring the circumferential elastic modulus and Poisson's ratio of a tube. Background technique [0002] A solid material deforms under the action of an external force, and the deformation disappears after the external force is removed, which is called elastic deformation. If the external force is continued beyond the deformation range, the deformation cannot be eliminated and is an irreversible process, which is called plastic deformation. The modulus of elasticity is numerically equal to stress divided by strain. Elastic modulus is an important index to evaluate key properties such as pipe deformation performance and elastic performance. Poisson's ratio refers to the dimensionless ratio of the lateral deformation to the longitudinal deformation of a material when it is deformed by stretching or compression. [0003] In the reactor...

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Problems solved by technology

[0004] At present, the existing technology measures the stress and strain of the cladding pipe under axial loading by stretching to measure the axial elastic modulus of the cladding pipe, but this method cannot measure the circumferential elastic modulus of the cladding pipe. Therefore, the radial deformation of the cladding tube cannot be evaluated

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