Determination method for predicting material uniaxial constitutive relation through circular ring radial compression energy

Abstract

The invention discloses a determination method for predicting material uniaxial constitutive relation through circular ring radial compression energy. According to the method, quasi-static pressing loading is carried out on a size-variable circular ring by adopting a compression clamp with a limiting groove, after a continuous load P- displacement V curve is obtained, radial compressive stiffness S of the circular ring is marked though the elastic region data of the load-displacement curve, and the material uniaxial constitutive relation is predicted through post processing. By adopting the method, the defects that both time and labor are consumed since finite element iteration is required to be carried out for multiple times and astringency cannot be evaluated in advance in the prior art are overcome, obtaining of the material uniaxial constitutive relation can be realized simply, conveniently and efficiently and an ideal effect is realized. Particularly, the method has important significance in obtaining of the material uniaxial mechanical properties of important pipeline structures existing in aerospace, nuclear power, high-speed rail, oil and gas transportation and other key projects.

Description

technical field [0001] The invention relates to the technical field of material mechanics experiment equipment. Background technique [0002] The uniaxial stress-strain curve (that is, the constitutive relationship) is the key link to establish the relationship between materials and mechanics, and plays an important role in the design and service of engineering components. The usual way to obtain the uniaxial constitutive relation of materials is to conduct tensile tests in the laboratory after processing raw materials or cutting standard tensile specimens from engineering components. With the development of structure miniaturization, limited by the size of components, it is difficult to obtain effective sample expansion tests according to traditional sampling methods. However, for key engineering pipeline structures such as aviation and nuclear power (such as nuclear fuel cladding tubes), it is difficult to intercept standard specimens, which makes the traditional tensile ...

AI Technical Summary

Problems solved by technology

Obviously, this method does not consider the influence of the error of the empirical formula of yield load on the results, and the process of multiple iterative calculations is cumbersome, which is not conducive to the easy acquisition of the uniaxial constitutive relationship of tubular materials or structures

In addition, the approximate formula of this method requires that the length l of the round tube is greater than its diameter D to be effective, so there is still a certain amount of material waste in the length direction

[0013] In the existing technical solution 2, multiple finite element iterative calculations are also required, which is time-consuming and laborious

And the convergence of the iterative result is greatly affected by the given initial value, and there is a problem that the convergence cannot be evaluated in advance

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