scholarly journals Strain Rate Dependence of Hardness for PE and SME TiNi Alloys

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1157
Author(s):  
Lingyan Shen ◽  
Mengmeng Hui ◽  
Yonggui Liu
Keyword(s):  
Strain Rate ◽  
Infrared Detector ◽  
Strain Rate Range ◽  
Rate Dependence ◽  
Strain Rate Dependence ◽  
Tini Alloy ◽  
Mechanical Coupling ◽  
Loop Area ◽  
Hardening Modulus ◽  
Hysteresis Loop Area

In this paper, the strain rate dependence of hardening behavior of polycrystalline pseudoelastic (PE) and shape memory effect (SME) TiNi alloy under impact loading was investigated by experiments. Measurements of stress–strain curves, hardening modulus, hysteresis loop area, and temperature variation are synchronized using in situ infrared detector system at the strain rate range from 300/s to 2000/s. It is shown that with the strain rate increasing, for PE specimens, strain rate hardening is observed, while SME specimens perform a strong nonlinear strain hardening. The results of synchronous temperature measurement show that in stress-temperature space, for PE samples, the dynamic transformation path is strain rate independent, but for the SME samples, the opposite is true. Thermal-mechanical coupling does not seem to explain this difference, and hardening from microstructure variation should be considered for such difference.

scholarly journals Strain Rate Dependence of Material Strength in AA5xxx Series Aluminum Alloys and Evaluation of Their Constitutive Equation

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 576 ◽  
Author(s):  
Hiroyuki Yamada ◽  
Tsuyoshi Kami ◽  
Ryota Mori ◽  
Tomoyuki Kudo ◽  
Minemitsu Okada
Keyword(s):  
Aluminum Alloys ◽  
Constitutive Equation ◽  
Strain Rate ◽  
Strain Rate Range ◽  
Rate Dependence ◽  
Strain Rate Dependence ◽  
Dynamic Strain ◽  
Material Strength ◽  
Rate Range ◽  
Aa5182 Alloy

The effect of strain rate on the mechanical properties of AA5xxx series aluminum alloys containing solute Mg atoms (AA5005, AA5021, AA5082 and AA5182) and pure aluminum (A1070) was investigated within a wide strain rate range of 1.0 × 10−4 to 1.0 × 103 s−1 at room temperature. The A1070 exhibited a positive strain rate dependence of material strength at the investigated strain rates. However, the AA5xxx series aluminum alloys primarily exhibited the negative strain rate dependence of material strength and serration caused by the Portevin-Le Chatelier effect on the Mg content and strain rate. As a result of using the material constitutive equation for the negative strain rate dependence, it was found that the flow stress may change in the dynamic strain rate range. However, it was found that the strain rate dependence of material strength differed in the AA5082 and the AA5182 alloys. It would be caused by less solute Mg of the Al phase in the AA5182 alloy than in the AA5082 alloy, because more Mg2Si compounds precipitated on Mn bearing particles as precipitation sites in the AA5182 alloy.

scholarly journals Reduced preload increases Mechanical Control (strain-rate dependence) of relaxation by modifying myosin kinetics

2021 ◽  
pp. 108909
Author(s):  
Brianna M. Schick ◽  
Hunter Dlugas ◽  
Teresa L. Czeiszperger ◽  
Alexandra R. Matus ◽  
Melissa J. Bukowski ◽  
...  
Keyword(s):  
Strain Rate ◽  
Rate Dependence ◽  
Strain Rate Dependence ◽  
Control Strain ◽  
Mechanical Control

scholarly journals Strain Rate Dependence of the Spall Strength of Steels

1997 ◽  
Vol 07 (C3) ◽  
pp. C3-951-C3-956 ◽  
Author(s):  
J. Buchar ◽  
S. Rolc ◽  
J. Hrebícek
Keyword(s):  
Strain Rate ◽  
Spall Strength ◽  
Rate Dependence ◽  
Strain Rate Dependence

Tensile Stress-Strain Curves Modeling of Four Kinds of Solders with Temperature and Rate Dependence

2005 ◽  
Vol 297-300 ◽  
pp. 905-911 ◽  
Author(s):  
Xu Chen ◽  
Li Zhang ◽  
Masao Sakane ◽  
Haruo Nose
Keyword(s):  
Tensile Stress ◽  
Constitutive Model ◽  
Strain Rate ◽  
Constant Strain Rate ◽  
Tensile Tests ◽  
Strain Rate Range ◽  
Rate Dependence ◽  
Strain Rates ◽  
Stress Strain ◽  
Rate Range

A series of tensile tests at constant strain rate were conducted on tin-lead based solders with different Sn content under wide ranges of temperatures and strain rates. It was shown that the stress-strain relationships had strong temperature- and strain rate- dependence. The parameters of Anand model for four solders were determined. The four solders were 60Sn-40Pb, 40Sn-60Pb, 10Sn-90Pb and 5Sn-95Pb. Anand constitutive model was employed to simulate the stress-strain behaviors of the solders for the temperature range from 313K to 398K and the strain rate range from 0.001%sP -1 P to 2%sP -1 P. The results showed that Anand model can adequately predict the rate- and temperature- related constitutive behaviors at all test temperatures and strain rates.

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