scholarly journals The Threshold Percolation Volume Fraction of Vitreous Silica on the Thermal Expansion Behavior of Quartz

2019 ◽  
Vol 07 (06) ◽  
pp. 1-6
Author(s):  
José Antonio Alves Júnior ◽  
João Baptista Baldo
Keyword(s):  
Thermal Expansion ◽  
Volume Fraction ◽  
Vitreous Silica ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior

scholarly journals Effects of added SiO2 nanoparticles on the thermal expansion behavior of shape memory polymer nanocomposites

2018 ◽  
Vol 30 (1) ◽  
pp. 32-44 ◽  
Author(s):  
Mohammad Javad Mahmoodi ◽  
Mohammad Kazem Hassanzadeh-Aghdam ◽  
Reza Ansari
Keyword(s):  
Thermal Expansion ◽  
Shape Memory ◽  
Polymer Nanocomposites ◽  
Volume Fraction ◽  
Coefficient Of Thermal Expansion ◽  
Shape Memory Polymer ◽  
Polymer Nanocomposite ◽  
Thermal Expansion Behavior ◽  
Interphase Region ◽  
Expansion Behavior

In this study, a unit cell–based micromechanical approach is proposed to analyze the coefficient of thermal expansion of shape memory polymer nanocomposites containing SiO2 nanoparticles. The interphase region created due to the interaction between the SiO2 nanoparticles and shape memory polymer is modeled as the third phase in the nanocomposite representative volume element. The influences of the temperature, volume fraction, and diameter of the SiO2 nanoparticles on the thermal expansion behavior of shape memory polymer nanocomposite are explored. It is observed that the coefficient of thermal expansion of shape memory polymer nanocomposite decreases with the increase in the volume fraction up to 12%. Also, the results reveal that with the increase in temperature, the shape memory polymer nanocomposite coefficient of thermal expansion linearly increases. The role of interphase region on the thermal expansion response of the shape memory polymer nanocomposite is found to be very important. In the presence of interphase, the reduction in nanoparticle diameter leads to lower coefficient of thermal expansion for shape memory polymer nanocomposite, while the variation of nanoparticles diameter does not affect the coefficient of thermal expansion in the absence of interphase. Based on the simulation results, the shape memory polymer nanocomposite coefficient of thermal expansion decreases as the interphase thickness increases. In addition, the contribution of interphase coefficient of thermal expansion to the shape memory polymer nanocomposite coefficient of thermal expansion is more significant than that of interphase elastic modulus.

Thermal expansion behavior of MgO/Cu composite with lower MgO volume fraction

2012 ◽  
Vol 47 (11) ◽  
pp. 3211-3215 ◽  
Author(s):  
Xiuhua Guo ◽  
Kexing Song ◽  
Shuhua Liang ◽  
Cuihua Zheng
Keyword(s):  
Thermal Expansion ◽  
Volume Fraction ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior

Anomalous thermal expansion behaviors of wood under dry and low-temperature conditions

Holzforschung ◽  
2014 ◽  
Vol 68 (5) ◽  
pp. 567-574 ◽  
Author(s):  
Tsunehisa Miki ◽  
Hiroyuki Sugimoto ◽  
Yuzo Furuta ◽  
Ichinori Shigematsu ◽  
Kozo Kanayama
Keyword(s):  
Thermal Expansion ◽  
Linear Thermal Expansion ◽  
Longitudinal Direction ◽  
Mechanical Analysis ◽  
Solid Wood ◽  
Compression Pressure ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior ◽  
Dry Conditions ◽  
Anomalous Thermal Expansion

Abstract The thermal expansion behavior of dry solid wood was investigated by dynamic dilatometry and thermal mechanical analysis. Anomalous thermal expansion behavior was observed concerning the displacement change under a constant compression pressure, which was not previously reported. Wood submitted to temperatures below 0°C under dry conditions exhibited a large increment in the linear thermal expansion coefficient (CLTE) and a sudden drop in the CLTE around 50°C as well as above 130°C during heating. In subsequent cooling/heating processes, these anomalous behaviors remained at temperatures below 100°C, although less pronounced, and disappeared at temperatures above 100°C. These behaviors were clearly perceptible in the radial and tangential directions but not in the longitudinal direction. The CLTE depended strongly on the heat and moisture history of the samples and the effects are species-specific.

Research on the thermal expansion behavior of anodic films on aluminium

1999 ◽  
Vol 346 (1-2) ◽  
pp. 280-283 ◽  
Author(s):  
Junbiao Zhou ◽  
Jiansheng Wu ◽  
Yuxing Yang
Keyword(s):  
Thermal Expansion ◽  
Anodic Films ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior

Effect of MgO Grain Size on Thermal Expansion Behavior of Alumina-Magnesia-Carbon Refractory

2013 ◽  
Vol 11 (6) ◽  
pp. 1012-1019 ◽  
Author(s):  
Santanu Mukhopadhyay ◽  
Arup K. Chattopadhyay ◽  
Gopesh C. Das ◽  
Saikat Maitra
Keyword(s):  
Grain Size ◽  
Thermal Expansion ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior

Thermal Expansion Behavior of Porous Rocks under Stress

1982 ◽  
pp. 173-183
Author(s):  
Roy F. Greenwald ◽  
Paul I. Ashqar ◽  
Wilbur H. Somerton
Keyword(s):  
Thermal Expansion ◽  
Porous Rocks ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior
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