Method for measuring deformation of metallic material in hyperthermia mechanical test as well as observation instrument

Abstract

The invention discloses a method of measuring deformation of metal material in the high-temperature mechanical test. First, a support is firmly erected in a safe distance from a heating furnace, a digital camera is mounted on the support, and the video output of the digital camera is connected to a computer by an information wire; two observation holes are opened on the wall of the heating furnace; two marks are made on a test piece right to the opposite of the observation holes of the furnace wall; the two marks on the test piece in the heating furnace are regarded as reference points; the feature information of the two reference points is recorded; coordinates of the two reference points in the image are determined by scanning; the distance between the reference points at the time is calculated; when the test piece expands by heat, deforms by stress or under heat-stress coupling action, the coordinates of the two reference points in the image are determined again, and the new distance between two reference points is calculated; in this way, the axial deformation of the test piece is observed; the method and the instrument of the invention can continuously track the axial deformation of the test piece in the high-temperature test to the steel, so as to effectively improve the precision of measuring the deformation of the test piece in the high-temperature test to the steel.

Description

technical field [0001] The invention relates to a deformation measuring method and an observation instrument of a metal material in a high-temperature mechanical test. Background technique [0002] In the fire resistance design and evaluation of building structures, it is necessary to calculate the strength and deformation of steel structures, aluminum structures or steel bars at high temperatures, which depends on the mechanical performance parameters of metal materials at high temperatures. The mechanical performance parameters of metal materials at high temperatures are determined through tests, and the tests must accurately measure the deformation within the selected gauge length of metal material specimens at high temperatures. [0003] Accurate measurement of deformation is difficult due to the high temperature environment inside the furnace. At present, people mainly use the following methods to measure the deformation of steel at high temperature: [0004] the firs...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the defect that the current deformation measurement method of metal materials in the high temperature mechanical test is not accurate enough, and the measuring instrument is easy to be damaged, and to provide a non-contact, high measurement accuracy, reusable method for measuring the deformation of metal materials at high temperature. Method for Measuring Deformation in Mechanical Test and Its Observing Instrument

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