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首页> 外文期刊>Journal of Materials Engineering and Performance >The adiabatic correction factor for deformation heating during the uniaxial compression test
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The adiabatic correction factor for deformation heating during the uniaxial compression test

机译：单轴压缩试验中变形加热的绝热校正系数

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摘要

The isothermal uniaxial compression test is a common method to determine the flow stress of metals. For accurate flow stress data at strain rates ＞10{sup}(-3) s{sup}(-1), the data must be corrected for flow softening due to deformation heating. The first step in the correction is to determine the increase in temperature. An adiabatic correction factor, η, is used to determine the temperature between strain rates of 10{sup}(-3) to 10{sup}1 s{sup}(-1) The adiabatic correction factor is the fraction of adiabatic heat retained in the workpiece after heat loss to the dies, η = (ΔT{sub}(ACTUAL))/(ΔT{sub}(ADIABATIC)), whereΔT{sub}(ADIABATIC) = (0.95∫σdε)/(ρC{sup}p). The term η is typically taken to be constant with strain and to vary linearly (0 to 1) with log (ε) between 10{sup}(-3) and 10{sup}1 s{sup}(-1). However; using the finite element method (FEM) and a one-dimensional, lumped parameter method, η has been found to vary with strain, die and workpiece thermal conductivities, and the interface heat-transfer coefficient (HTC). Using the lumped parameter method, an analytical expression for η was derived. In this expression, η is a function of the die and workpiece thermal conductivities, the interface heat-transfer coefficient, workpiece heat capacity, strain, and strain rate. The results show that an increase in the HTC or thermal conductivity decreases η.
机译：等温单轴压缩试验是确定金属流动应力的常用方法。为了获得应变率＞ 10 {sup}（-3）s {sup}（-1）时的精确流应力数据，必须校正该数据以防止由于变形加热而引起的流软化。校正的第一步是确定温度的升高。绝热校正因子η用于确定应变率在10 {sup}（-3）到10 {sup} 1 s {sup}（-1）之间的温度。绝热校正因子是绝热保留的分数模具热损失后工件中的η=（ΔT{sub}（ACTUAL））/（ΔT{sub}（ADIABATIC）），其中ΔT{sub}（ADIABATIC）=（0.95∫σdε）/（ρC{sup } p）。术语η通常被认为是随应变恒定的，并且在10 {sup}（-3）和10 {sup} 1 s {sup}（-1）之间以log（ε）线性变化（0到1）。然而;使用有限元方法（FEM）和一维集总参数方法，发现η随应变，模具和工件的热导率以及界面传热系数（HTC）而变化。使用集总参数方法，得出η的解析表达式。在此表达式中，η是模具和工件热导率，界面传热系数，工件热容量，应变和应变率的函数。结果表明，HTC或导热系数的增加会降低η。

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