Measurement method of circumferential elastic modulus and Poisson ratio of pipe

Abstract

The invention discloses a measurement method of circumferential elastic modulus and a Poisson ratio of a pipe. The method comprises the following steps: S1, measuring outer diameters of two ends of the to-be-measured pipe and three middle positions of an axial direction, respectively taking arithmetic mean values, measuring inner diameters of positions of the two ends of the to-be-measured pipe, respectively taking arithmetic mean values, and obtaining an outer diameter R<0>, an inner diameter R<in> and thickness t of the to-be-measured pipe; S2, respectively determining axial deformation andtransverse deformation theta of the to-be-measured pipe under different internal-pressure loading quantity; and S3, obtaining the circumferential elastic modulus E<1> of the to-be-measured pipe through a graphic solving method or a fitting method according to a formula (1), and obtaining the Poisson ratio nu of the to-be-measured pipe according to a formula (2). The method is suitable for use in measuring circumferential elastic modulus and Poisson ratios of thin-walled circular pipes, and solving the problem that the circumferential elastic modulus and the Poisson ratios are difficult to measure by non-standard experiment; and deformation performance of the pipe can be fully evaluated by the measured circumferential elastic modulus and Poisson ratio, elastic deformation of the pipe can becalculated, and a reference can be provided for designing, calculation and verification of a fuel component.

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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