﻿ 粘弹性力学在高温铸造合金单向拉伸试验中的应用

# 粘弹性力学在高温铸造合金单向拉伸试验中的应用 Application of Viscoelasticity Mechanics into Uniaxial Tensile Test of High Temperature Cast Alloy

The stress-strain differential constitutive relation was given for Kelvin chain. On basis of all the initial conditions taken into account, the general solutions of total strain were derived for Burgers fluid with 4 parameters and Kelvin-Maxwell model with 6 ones under the step function uniaxial stress. Both Burgers fluid with 4 parameters and Kelvin-Maxwell model with 6 ones could approximately describe the former two stages of creep curve but not reflect the third stage. Numerical calculation for cast Mar-M200 alloy creep curve shows that two theories predictions are in good agreement with test measurement results, especially the maximum relative error of Kelvin-Maxwell model with 6 parameters is only 5.4765779%.

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