Anomalous strain rate sensitivity of twinning was observed in a Mg-Al-Mn magnesium alloy during extrusion around 723 K (450 °C). The density of twins decreases as the ram speed increases. At 10 mm min, relatively high density twins are activated, but much fewer twins were ...
Strain rate sensitivity index´s theoretical formulae expressed by experimental parameters and its measurement.pdf55阅读 文档大小:138.58K 5页 jdzqlily上传于2015-04-28 格式:PDF Analysis of anisotropy and strain rate sensitivity of open-cell metal foam 热度: Dynamic capabilities for service ...
Strain rate refers to the sensitivity of plastic deformation to time scales, characterized by the rate of strain under a specific stress and strain condition. AI generated definition based on: Encyclopedia of Materials: Science and Technology, 2001 ...
1.2. Modeling the Strain Rate Sensitivity of Multiphase Steels Most materials exhibit some sensitivity to the strain rate at which they are deformed. In the case of steels, numerous studies have shown that most of them are hardened when they are deformed at higher rates [21]. Strain rate hard...
12.3.2 Strain-rate sensitivity The strain-rate dependence of the constitutive relation of material reflects the strain-rate sensitivity of the material. Fig. 12.9 shows the uniaxial tensile curve of mild steel at different strain rates. It can be seen that the upper yield point of curve A (at...
5. Their compressivestress-straincurves are typically three-region curves, including elastic region, collapse region and densification region. And they show signally strain rate sensitivity. 6. When the surface braided angle is bigger, thestress-straincurve shows bilinear relation and tensile failure ...
Due to the importance of establishing the quantitative mechanical analysis th eory of superplastic deformation, the mechanical meanings of material paramete r k and strain-rate sensitivity index m in Backofen′s constitutive equa tion are discussed. The canonical measurement formulae and methods of m...
A statistical method incorporating multiple linear regression was also employed successfully and a set of empirical formulae was derived to describe the effects of temperature and strain rate quantitatively. These mechanical properties were applied to finite element analysis to study the sensitivity of ...
This kind of phenomena – related to negative Strain-Rate Sensitivity (Wilcox and Rosenfield 1966; Xu et al. 2022) (SRS) – arises as a strain rate dependent phenomenon; moreover its character and presence are dependent on the temperature. The PLC effect is attributed to Dynamic Strain Aging...
where \(k_{11}\) and \(k_{21}\) are the linear and nonlinear rate sensitivity control parameters, respectively, and \(c_{21}\) is the rate sensitivity index. We use \(k_{11} = 1\), \(k_{21} = 1\), and \(c_{21} = 0.75\) for generating the training data. The expres...