Method for processing stress-fringe-order numerical values of photoelastic model

Abstract

The invention discloses a method for processing stress-fringe-order numerical values of a photoelastic model. The method comprises the following steps that (1) part of a rotating photoelastic model test piece is selected, and a manufacturing method same as the method for manufacturing the photoelastic model is used for manufacturing an auxiliary photoelastic model; (2) rotating centrifugal force acting on the auxiliary photoelastic model is converted into tension, and the auxiliary photoelastic model is subjected to classified increment freezing loading; (3) test data of stress-fringe-order numerical values of the auxiliary photoelastic model subjected to classified increment freezing loading are acquired, and are subjected to curve fitting; (4) the stress-fringe-order numerical values of the photoelastic model are corrected by using fitting data variables. The stress-fringe-order numerical values of the photoelastic model obtained through the method are more close to the real stress level.

Description

technical field [0001] The invention relates to the field of photoelasticity tests, in particular to a method for processing stress stripe level values ​​of a photoelastic model. Background technique [0002] At present, the stress distribution of the test piece obtained by the photoelastic test is the main technical means used to evaluate the working stress in the product prototype design, and plays an important role in the strength analysis of product design. [0003] The photoelastic test object is the photoelastic model. With the development of aviation technology, more and more test pieces are prototyped as high-speed rotating parts, but the photoelastic model is not suitable for high-speed rotation, and the test equipment has certain limitations on the applied load. However, sometimes the stress stripes in the model are sparse after the test, and the highest stress stripe level value is too small. In this case, the error of the model stress stripe level value read out ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for processing the stress stripe level value of a photoelastic model, so as to solve the problem of the low accuracy of the processing method for obtaining the stress stripe level value of the rotating part in the existing photoelasticity test; The stress fringes are sparse, the stress fringe level value is small, and the initial stress fringe seriously interferes with the accurate interpretation of the model stress fringe level value, resulting in a technical problem that the accuracy of the test cannot be effectively controlled

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