Application of Constitutive Equation incorporating Phase Transformation to Nonlinear Deformation of Porous Material

2004 ◽  
Vol 2004.17 (0) ◽  
pp. 41-42 ◽  
Author(s):  
Atsushi SAKUMA ◽  
Kazuhiro MANDAI ◽  
Takaaki MAEDA ◽  
Shigeru NAGAKI
Keyword(s):  
Phase Transformation ◽  
Constitutive Equation ◽  
Porous Material ◽  
Nonlinear Deformation

Phenomenological Mechanism of Transformation Plasticity and the Constitutive Law Coupled with Thermo-Mechanical Plasticity

2008 ◽  
Vol 33-37 ◽  
pp. 1351-1358 ◽  
Author(s):  
Tatsuo Inoue
Keyword(s):  
Plastic Deformation ◽  
Phase Transformation ◽  
Simple Model ◽  
Constitutive Equation ◽  
Yield Function ◽  
Constitutive Law ◽  
Strain Rates ◽  
Strain Response ◽  
Transformation Plasticity ◽  
New Phase

Phenomenological mechanism of transformation plasticity is proposed in the first part of the paper by use of simple model why stress in mother phase increases to reach yielding due to progressing new phase and to induce plastic deformation even under small applied stress. Based on the discussion, a unified constitutive model including transformation-induced and ordinal thermomechanical plastic strain rates by introducing an effect of varying phases during phase transformation into yield function. Thus derived constitutive equation is applied to describe strain response under varying temperature and stress with some discussions as well as metallo-thermo-mechanical simulation of quenching.

Investigation on Mechanical Behaviors of Shape Memory Alloy Torsion Rod

2011 ◽  
Vol 179-180 ◽  
pp. 455-458
Author(s):  
Bo Zhou ◽  
Zhen Qing Wang ◽  
Yan Ju Liu ◽  
Jin Song Leng
Keyword(s):  
Phase Transformation ◽  
Constitutive Equation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Martensitic Phase Transformation ◽  
Mechanical Behaviors ◽  
Transformation Temperatures ◽  
Mechanics Of Materials ◽  
Niti Sma ◽  
The Relationship

DSC test is carried out to determine the phase transformation temperatures of a NiTi SMA, which include martensitic starting temperature, martensitic finishing temperature, austenitic starting temperature and austenitic finishing temperature. The mechanical behaviors of shape memory alloy (SMA) torsion rod are investigated by using Zhou’s shear constitutive equation of SMA and the theorem of circular shaft in mechanics of materials. A critical torque equation is developed to describe the relationship between the martensitic phase transformation critical torque of SMA torsion rod and temperature.

scholarly journals A thermo-elastoplastic constitutive equation including phase transformation and its applications

2009 ◽  
Vol 58 (13) ◽  
pp. 29
Author(s):  
Chen Bin ◽  
Peng Xiang-He ◽  
Fan Jing-Hong ◽  
Sun Shi-Tao ◽  
Luo Ji
Keyword(s):  
Phase Transformation ◽  
Constitutive Equation

Analysis of Thermo-Mechanical Behavior of Shape Memory Alloys

2010 ◽  
Vol 452-453 ◽  
pp. 149-152
Author(s):  
Hong Shuai Lei ◽  
Zhen Qing Wang ◽  
Bo Zhou ◽  
Yu Long Wang
Keyword(s):  
Phase Transformation ◽  
Numerical Calculation ◽  
Constitutive Equation ◽  
Shape Memory Alloy ◽  
Mechanical Behavior ◽  
Shape Memory ◽  
Transformation Behavior ◽  
Test Result ◽  
Optical Micrographs ◽  
Numerical Calculation Result

Shape Memory Alloy (SMA) is widely used and plays an important role in various engineering fields due to its special characteristics of shape memory effect and super-elasticity. In this paper the phase transformation behavior and thermo-mechanics behavior of 50.0at%Ni-Ti SMA are investigated though differential scanning colorimeter (DSC) and tensional tests respectively. Optical micrographs show the transformation of austenite and twinned martensite. The comparing numerical calculation result with tensional test result shows the new macro-mechanical constitutive equation can express the thermo-mechanical behavior of SMA effectively.

scholarly journals Влияние пористости и размера зерна на фазовый состав и механические свойства керамики на основе диоксида циркония

2018 ◽  
Vol 44 (15) ◽  
pp. 20 ◽  
Author(s):  
Н.Л. Савченко ◽  
Т.Ю. Саблина ◽  
И.Н. Севостьянова ◽  
А.Г. Бурлаченко ◽  
С.П. Буякова ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Grain Size ◽  
Phase Transformation ◽  
Porous Material ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Mechanical Stresses ◽  
Strength Of Materials ◽  
Ultrahigh Molecular Weight ◽  
Embedded Particles ◽  
Main Factor

AbstractZrO_2(Y) ceramic with embedded particles of a pore-forming agent—ultrahigh molecular weight polyethylene—has been studied. It has been shown that the porosity of samples after sintering changed from 2 to 42 vol % and the grain size changed from 0.5 to 1.55 μm depending on sintering regime. The strength of materials with minimum porosity was 3000 ± 200 MPa, while the strength of materials with maximum porosity was 100 ± 20 MPa, regardless of grain size. It has been shown that the tetragonal to monoclinic martensitic phase transformation related to mechanical stresses takes place in the material without any effect on the macrostrength of the material. Internal microscopic stresses decreasing with an increase in porosity and ceramic grain size are the main factor causing this transformation in a porous material.

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