Method for carrying out high-strain-rate uniaxial compression test by using L-gauge

Abstract

The invention relates to a method for carrying out a high-strain-rate uniaxial compression test by using an L-gauge, and belongs to transformation of main shafts of a general unit of a thermal simulation testing machine. The method comprises the following steps of: dismounting couplings of a movable main shaft a and a movable main shaft b; mounting a sample between the movable main shaft b and the fixed main shaft c; selecting the L-gauge as a stress / strain test mode, applying stress to a sample through the movable main shaft a during a compression test to enable the sample to generate axial compression strain, and the compression amount of the sample being detected by the L-gauge; after completing compression, enabling the system to collect time, temperature, stress, strain and L-gauge data in a compression stage, and draw a true stress-strain curve. According to the method, a uniaxial compression test with a high strain rate is carried out in the general unit of the thermal simulation testing machine, and axial displacement change is accurately measured by using the axial strain L-gauge instead of displacement stroke, so that an accurate and smooth true stress-strain curve and related microscopic information of a material in a high-temperature state are obtained.

Description

technical field [0001] The invention relates to a method for performing a thermal simulation test on a metal sample, in particular to a method for using an L-gauge to perform a high strain rate uniaxial compression test on a metal sample, and belongs to the technical field of iron and steel metallurgy physical simulation. Background technique [0002] Different thermal deformation processes, especially different strain rates, have a direct impact on the final structure and properties of metal materials. Existing thermal simulation testing machines generally have two parts, the general unit and the hydraulic wedge unit, which can be switched. The hydraulic wedge part mainly It is used to simulate some thermal compression tests, and the general-purpose unit does some thermal stretching and thermal expansion characteristics tests. There are about 150 different models of thermal simulation testing machines in China. Some users cannot perform thermal compression tests without hyd...

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Problems solved by technology

The main shaft, air hammer and test procedure (method) of the current general-purpose unit of the thermal simulation testing machine cannot meet the requirements of the uniaxial compression test with a high strain rate, especially if the strain rate is greater than 10s -1 The uniaxial compression test, which is mainly caused by the response speed of the general unit system and the test method

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