A Method for Predicting the Stress-Strain Curve of Materials at High Temperature and High Strain Rate

Abstract

A method for predicting the stress-strain curve of a material at high temperature and high strain rate according to the present invention comprises step 1: obtaining the low-speed and high-speed tensile test data of the macroscopic material in the state of normal temperature and pressure through the test, and drawing the stress-strain curve; step 2: using The molecular dynamics method simulates and calculates the stress-strain curve of the material at room temperature; step 3: compare the stress-strain curve calculated by the molecular dynamics method with the stress-strain curve tested by the test, if the comparison results are quite different, adjust the simulation of the molecular dynamics method Parameters, recalculate until the calculation results are consistent with the test results, save the best simulation parameters; step 4: adjust the temperature and strain rate, under the best simulation parameters, use molecular dynamics method to simulate and calculate the material at high temperature and high speed the stress-strain curve. The method uses the molecular dynamics method, which can simulate and calculate the material stress-strain curves at different temperatures and different strain rates, which greatly reduces the test cost.

Description

technical field [0001] The invention belongs to the field of computer simulation and material mechanics, and relates to a method for predicting the stress-strain curve of a material at high temperature and high strain rate. Background technique [0002] The molecular dynamics method is a computer simulation experiment method, which mainly relies on Newtonian mechanics to simulate the motion of the molecular system, so as to draw samples in the system composed of different states of the molecular system, thereby calculating the configuration integral of the system, and Based on the results of configuration integration, the thermodynamic quantities and other macroscopic properties of the system are further calculated. Molecular dynamics methods are widely used in materials science, biophysics, and pharmaceutical design. The development of computer technology has injected new vitality into molecular dynamics simulation. In the laboratory, the high-speed tensile testing machin...

AI Technical Summary

Problems solved by technology

However, the high-speed tensile testing machine in the laboratory can only measure the stress-strain curve of the material at room temperature, and cannot obtain the high-strain rate stress-strain curve at high temperature.

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