真应力

对喷射态超高碳钢UHCS-3.0Si进行了等温压缩物理模拟试验，测定了真应力-真应变曲线。

Ultrahigh carbon steel ( UHCS-3.0Si ) was tested by isothermal compression physical simulation tests as spray-formed state , and true stress vs. true strain curves were obtained .

测量了真应力应变曲线。

The true stress - stain curve was measured .

应用Matlab建立高温热变形过程中真应力真应变的计算模型

Calculation Mold on True Stress-true Strain in High Temperature Hot Deformation Applied by Matlab

随着碳含量的降低，压缩真应力降低的幅度变大，且开始下降所需的减面率γc降低。

The decrease of compression flow stress becomes more significant and its critical value γ _c decreases with the decrease of carbon content .

Z较小时，发生不连续动态再结晶，但真应力真应变曲线未出现波动。

But the true stress-true strain curve does not accompany stress oscillation when discontinuous dynamic recrystallization occurs .

采用真应力一真应变曲线和TEM研究其高温压缩变形中的流变应力行为和它的动态再结晶过程。

The dynamic recrystallization mechanism during hot compress was examined by the true stress-strain curves and TEM .

C-Mn钢过冷奥氏体形变过程中的真应力&真应变曲线分析

Analysis of True Stress-True Strain Curves of Undercooled Austenite during Deformation in Low C-Mn Steels

根据在拉伸过程中采集的瞬时载荷、瞬时位移数据，应用Matlab软件建立了其在热变形过程中的真应力真应变计算模型，并把实际测量的截面面积与模型计算值进行了比较。

The calculation mold of true stress and true strain were built according to the data of load and displacement during hot deformation by matlab software . Moreover , experimental values of section area were compared to those from calculation .

根据单道次变形后的真应力-真应变曲线，建立X65管线钢奥氏体区变形抗力的数学模型；

With the true stress-strain curves after single pass deformation , the models of flow stress during hot deformation can be built up .

室温条件下，Inconel718合金塑性变形阶段的真应力-真应变关系可用Voce型公式描述，拟合方程式的相关系数大于099。

At ambient temperature , the plastic deformation stage of the true stress-strain curves of Inconel 718 can be expressed by Voce Relationship , and the interrelated factors for equation fitting are both over 0.99 .

在应变速率为10s-1时，真应力-真应变曲线出现明显的波动，说明尽管玻璃/铝基复合材料的层错能比较高，仍可发生动态再结晶。

At the strain rate of 10s-1 the true stress-strain curves exhibit oscillations apparently , this indicate that dynamic recrystallization can be happen , though there is the high stacking fault energy for Glass / Aluminium Metal Matrix Composites . 3 .

采用Gleeble1500物理模拟试验机对喷射态超高碳钢（UHCS）进行了等温压缩物理模拟试验，测定了真应力-真应变曲线，计算了不同温度和应变速率条件下的变形激活能。

Isothermal compression tests of physical simulation were carried out on a spray formed ultrahigh carbon steel ( UHCS ) by Gleeble 1500 system . True strain-true stress curves were obtained . The deformation activation energies at different temperature range and different strain rate were calculated .

本文结合高温拉伸实验数据，对上述计算方法和公式进行了归纳，修正，并编写高温拉伸真应力真应变计算分析软件（TTCAS）。

With the high temperature tensile test data , the calculation methods and formulas were summarized and amended , and the program of True stress-True strain Calculation and Analysis Software were compiled by VB ( TTCAS ) .

基于机器视觉的材料真应力&应变测试技术研究

Research on Materials Test Technology of Real Stress-Strain Based on Machine Vision

真应力-应变的定义及其力学特征

Definition and Mechanical Characteristics of True Stress - Strain

真应力应变曲线的自动测试

Automatic Measurement of the Actual Stress & strain Curve

高温拉伸真应力-真应变计算分析软件开发

Development of software of true stress-true strain computation and analysis for high-temperature tension

得到了均匀形变阶段和非均匀形变阶段的真应力应变关系。

The stress-stain relation for homogeneous stage and inhomogeneous stage of deformation were obtained .

反应堆结构金属材料的拉伸真应力&应变曲线测定

The Measurements of the Tensile True Stress - Strain Curves for the Reactor Structural Metals

高温拉伸试验中真应力真应变的计算及试验研究

Calculation Model and Experimental Verification on True Strain and True Stress in Hot Tensile Test

测试了其真应力应变曲线，观察了变形后的显微组织。

The compressive true stress - true strain curves were measured and hot deformation microstructures were observed .

随应变速率升高，真应力-真应变曲线形状从锯齿型向平滑型转变。

The shapes of true stress-true strain curves transform from serration to smoothing with the increasing of strain rate .

温度对饱和棘轮应变～峰值真应力曲线的形状影响不大。

But temperature has little influence on the shape of curve between saturated ratchetting strain and peak true stress .

结果表明：在试验变形条件范围内，合金的真应力-真应变曲线为动态再结晶型；

The results show that the true stress-strain curves of the alloys have dynamic recrystallization character under the present deformation conditions ;

采用真应力－真应变曲线，偏振光金相和透射电子显微镜研究该合金热扭转过程的动态复原机制。

The dynamic restoration mechanisms during hot torsion were examined by the true stress true strain curves , optical and electron microscopy .

在较低变形速率条件下，真应力随真应变迅速增加，到达峰值后便进入稳态变形阶段；在较高变形速率条件下，真应力到达峰值后，迅速下降，随之进入稳态变形阶段。

At low strain rate , the true stress increases with true strain rapidly and enters a steady state after reached peak flow .

对真应力-真应变曲线和显微组织研究发现，氢可提高材料的热塑性，降低材料的热变形抗力。

It is found that hydrogenation is able to improve the plasticity of BT20 alloy and lower the flow stress during the hot deformation .

按照这套方法可得到更加准确的等温等应变速率真应力真应变曲线。

In this method , the true stress & true strain curves in equal temperature and equal strain rate can be obtained more exactly .

薄带连铸304不锈钢高温热变形时真应力真应变计算模型的研究

Study on a Calculation Model for True Stress and Strain of 304 Stainless Steel Strip Continuous Casting at High Temperature and in Hot Deformation

采用二阶应变梯度塑性理论，得出伸长率、峰值应力后工程应力应变曲线和真应力应变曲线的解析解，结果表明三者均具有尺寸效应。

Analytical solutions of scale law for the engineering stress-engineering strain curve , true stress-true strain curve and percentage elongation were proposed based on gradient-dependent plasticity .