Mechanical behavior at different temperatures and stresses for superelastic nickel–titanium orthodontic wires having different transformation temperatures

2002 ◽  
Vol 18 (1) ◽  
pp. 88-93 ◽  
Author(s):  
M Iijima
Keyword(s):  
Mechanical Behavior ◽  
Orthodontic Wires ◽  
Transformation Temperatures ◽  
Different Temperatures

A Method for Predicting the Behavior of Plastics at Different Temperatures

2014 ◽  
Vol 1039 ◽  
pp. 107-111
Author(s):  
Yang Chen ◽  
Gui Qin Li ◽  
Bin Ruan ◽  
Xiao Yuan ◽  
Hong Bo Li
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Constitutive Model ◽  
Research And Development ◽  
Mechanical Behavior ◽  
Plastic Material ◽  
Different Temperatures ◽  
Plastic Parts

The mechanical behavior of plastic material is dramatically sensitive to temperature. An method is proposed to predict the mechanical behavior of plastics for cars, ranging from low-temperature low temperature ≤-40°C to high temperature ≥80°C. It dominates the behavior of plastic material based on improved constitutive model in which the parameters adjusted by a series of tests under different temperatures. The method is validated with test and establishes the basis for research and development of plastic parts for automobile as well.

Understanding the Effects of Processing on the Mechanical Behavior of a SI3N4 Ceramic Through Microstructural Investigations

2001 ◽  
Author(s):  
Q. Wei ◽  
J. Sankar
Keyword(s):  
High Temperature ◽  
Mechanical Behavior ◽  
Triple Junctions ◽  
Sintering Aids ◽  
Si3n4 Ceramic ◽  
Creep Tests ◽  
Furnace Annealing ◽  
Conventional Furnace ◽  
Different Temperatures ◽  
Si3n4 Ceramics

Abstract The mechanical properties of silicon nitride (Si3N4) ceramics are determined by their microstructure, which in turn depends on processing routes adopted to fabricate the material. To obtain dense Si3N4, sintering aids are almost always added during the densification process. The sintering aids remain in the ceramics as amorphous residues which adversely affect the high temperature mechanical behavior of the material. In this paper, we have investigated the effects of processing on the mechanical behavior of a sintered Si3N4 ceramic through detailed microstructural observations. A commercial Si3N4 was annealed using conventional furnace annealing and microwave annealing at different temperatures. Creep tests were performed to compare the high temperature mechanical behavior of the as-sintered and annealed ceramics. It was found that microwave and furnace annealing heat-treatments improve the creep resistance of the ceramic through devitrification of the triple junctions phases.

Mechanical Behavior and Constitutive Equation of Concrete under High-Temperature Dynamical Conditions

2011 ◽  
Vol 228-229 ◽  
pp. 303-308
Author(s):  
Bin Jia ◽  
Zheng Liang Li ◽  
Jun Lin Tao ◽  
Chun Tao Zhang
Keyword(s):  
High Temperature ◽  
Constitutive Equation ◽  
Strain Rate ◽  
Mechanical Behavior ◽  
Test Data ◽  
Dynamical Behavior ◽  
Hardening Effect ◽  
Failure Evolution ◽  
Different Temperatures ◽  
Strain Rate Hardening

SPHB tests of concrete under different temperatures and various loading conditions are completed, and high-temperature dynamical behavior of concrete is obtained. Dynamical mechanical behavior of concrete with high temperature is affected by not only the strain rate effect, but also the high temperature weakening effect, and the strain rate hardening effect is coupled with high temperature weakening effect, but the latter has greater influence. Concrete failure evolution is described on basis of the damage factor, the intercoupling strain rate hardening effect and temperature weakening effect are simply set as mutually independent factors, each parameter is respectively fitted with test data, finally, concrete constitutive equation under high-temperature dynamical conditions is established, and comparative analysis with test data are conducted, indicating good coincidence with test results.

Thermo-Mechanical Behavior of Epoxy Shape Memory Polymer

2013 ◽  
Vol 721 ◽  
pp. 169-172 ◽  
Author(s):  
Yu Gu ◽  
Shao Xiong Li
Keyword(s):  
Mechanical Behavior ◽  
Shape Memory ◽  
Significant Influence ◽  
Smart Materials ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Testing Temperature ◽  
Curing Agent ◽  
Different Temperatures ◽  
Viscoelastic Behaviors

The viscoelastic behaviors of shape memory polymers have a significant influence on the function realization of this kind of smart materials. In this study, stress-strain hysteresis under uniaxial tension of epoxy shape memory polymers with varied curing agent contents and types were tested at different temperatures. The effects of the testing temperature, curing-agent type and content on the viscoelastic behaviors of the materials were discussed.

Mechanical behavior of polymer stabilized sand under different temperatures

2021 ◽  
Vol 290 ◽  
pp. 123237
Author(s):  
Yuxia Bai ◽  
Jin Liu ◽  
Yujun Cui ◽  
Xiao Shi ◽  
Zezhuo Song ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Different Temperatures ◽  
Polymer Stabilized

Experimental Evaluation of Mechanical Behavior of GaAs Wafer Material

1991 ◽  
Vol 226 ◽  
Author(s):  
Jun Ming Hu ◽  
Michael Pecht ◽  
Donald Barker
Keyword(s):  
Stress Intensity Factor ◽  
Thermal Expansion ◽  
Mechanical Behavior ◽  
Material Properties ◽  
Coefficient Of Thermal Expansion ◽  
Critical Value ◽  
Modulus Of Rupture ◽  
Gaas Wafer ◽  
Different Temperatures ◽  
Temperature Ranges

AbstractThe mechanical behavior of non-metalized GaAs wafer material at different temperatures were evaluated. The material properties of GaAs, including the modulus of elasticity, the modulus of rupture, the critical value of stress intensity factor, and the coefficient of thermal expansion, were experimentally determined over various temperature ranges.

Mechanical Behavior and Structural Analysis of a TiNi Alloy Annealled in the 300 to 500°C Range and Air Cooled

2016 ◽  
Vol 869 ◽  
pp. 497-502
Author(s):  
Lioudmila Aleksandrovna Matlakhova ◽  
Everton Maick Rangel Pessanha ◽  
Eduardo Atem de Carvalho
Keyword(s):  
Structural Analysis ◽  
Mechanical Behavior ◽  
Mechanical Tests ◽  
Applied Strain ◽  
Tini Alloy ◽  
Light Metals ◽  
X Ray ◽  
Annealing Temperatures ◽  
Different Temperatures ◽  
Scanning Electron

This work has as objectives the structural analysis and mechanical behavior of a TiNi (46.5Ti-53.5Ni (wt%) / 51.6Ti-48.4Ni (at%)) alloy displaying Shape Memory Effect, manufactured by Light Metals Institute, in Russia, as a ∅ 5.12 mm wire. Samples were annealed at 300 to 550oC, and air cooled afterwards. X-Ray and scanning electron microscopy structural analysis was performed. Mechanical tests by compression testing were made, up to 10% strain, with control unloading, and afterwards continued up to fracture. The alloy has shown itself sensitive to the heat treatment and applied strain. In the alloy, after annealing at different temperatures in the interval of 300 to 550oC, phases B19’, R and Ti2Ni, were identified. Along higher annealing temperatures, up to 550oC, R phase was replaced by B2. In this alloy, strain induced Martensitic Reversible Transformations (MRT) type B2/R→B19 ́/Rdef were induced.

Property Improvement of TiNi by Cu Addition for Orthodontics Applications

2011 ◽  
Vol 87 ◽  
pp. 95-100 ◽  
Author(s):  
A. Phukaoluan ◽  
Anak Khantachawana ◽  
Pongpan Kaewtatip ◽  
Surachai Dechkunakorn ◽  
N. Anuwongnukroh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Internal Stress ◽  
Thin Plates ◽  
Orthodontic Wires ◽  
Transformation Temperatures ◽  
Cu Content ◽  
Ni Content ◽  
Heat Treated

This study aims to investigate mechanical properties and transformation behavior of TiNiCu shape memory alloys to obtain optimal conditions for utilizing as orthodontic wires. TiNi binary alloys with Ni-content 50.6 at.%, TiNiCu alloys with Cu-content ranging from 5 to 10 at.% were prepared. The alloys were melted by electrical arc-melting method and then homogenized at 800°C for 3600 s. The alloys were subsequently sliced into thin plates (1.5 mm) by EDM wire cutting machine. To evaluate mechanical properties, the specimens were cold-rolled with 10, 20 and 30%, followed by heat treatment at 400°C and 600°C for 3600 s, respectively. A Differential Scanning Calorimeter (DSC) was used to detect transformation temperatures. Mechanical properties were evaluated by micro hardness and three-point bending tests. The results showed that transformation temperatures were strongly increased with increasing Ni-content. Moreover, the decrease in transformation temperature after increasing level of cold-rolling reduction ratio suggests that internal stress can depress transformation. However, internal stress seemed to support the introduction of superelasticity for each specimen. In addition, specimens heat treated at 400°C have, more appropriate properties as orthodontic wires than those heat-treated at 600°C due to the remaining effect of cold-working. These results can be take into consideration for optimizing alloy composition and mechanical properties of TiNiCu shape memory alloys for orthodontics wires purposes.

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