Intelligent breaking elongation test method of metal material based on random point tracking

Abstract

The invention relates to an intelligent breaking elongation test method of a metal material based on random point tracking. Before test, random points in irregular sizes and shapes are sprayed on the surface of the detected metal material by paint spraying equipment as marks. The method comprises the steps of: during the test, acquiring an image sequence of surface deformation of the detected material with a machine vision system, automatically selecting a best original gauge length and a final gauge length for calculating breaking elongation of the metal material according to a breaking position and preset local elongation, and accurately working out the breaking elongation of the metal material. With the adoption of the method, the detection precision of the breaking elongation of the metal material can be improved, different local elongations and a deformation trend of the material during tension can be automatically analyzed and calculated, and the method provides scientific bases for material detection and product design.

Description

technical field [0001] The invention relates to the technical field of detection of performance parameters of metal materials, in particular to an intelligent test method for elongation at break of metal materials based on random point tracking. Background technique [0002] Tensile test is a test method that applies a continuous increase in uniaxial tensile force to the sample and simultaneously detects the elongation of the sample. It is widely used in testing the mechanical properties of metal materials and products. Tensile test is the most widely used test method to evaluate the performance of metal materials, and the reliability of the test results is very important for the quality management and control of both users and manufacturers. [0003] At present, the common method for measuring the elongation after fracture of metal materials is to first determine the original gauge length on the tensile sample. After the sample is broken, no matter where the fracture positi...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an intelligent testing method for the elongation at break of metal materials based on random point tracking, so as to solve the problem that the original gauge length of the metal material detection sample is pre-set when measuring the elongation after break. Poor detection accuracy of elongation after fracture

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