Effective thermal expansion coefficient of a sintered glass–eucryptite composite

2017 ◽  
Vol 52 (19) ◽  
pp. 11314-11325 ◽  
Author(s):  
O. N. Kryukova ◽  
A. G. Knyazeva ◽  
V. M. Pogrebenkov ◽  
K. S. Kostikov ◽  
I. Sevostianov
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Sintered Glass ◽  
Effective Thermal Expansion

Effective thermal expansion coefficient of frozen granite soil

2007 ◽  
Vol 44 (10) ◽  
pp. 1137-1147 ◽  
Author(s):  
Weon-Keun Song
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Numerical Technique ◽  
Reference Value ◽  
Subzero Temperature ◽  
Soil Medium ◽  
Freezing Test ◽  
Effective Thermal Expansion ◽  
Granite Soil

The paper focuses on the development of a model for the coupled thermal transfer and frost action of a soil medium, considering the phase-change effect in the frozen fringe, for a closed system. The frost pressure of the cylindrical soil specimens observed in the freezing test gave a reference value to determine the effective thermal expansion coefficient numerically. Through the proposed numerical technique, the effective thermal expansion coefficient was defined for the frozen granite soil as a function of subzero temperature and initial in situ pore-water content. A comparative analyses between the numerical results and the measurements obtained in the freezing chamber test was conducted to verify the performance of the effective thermal expansion coefficient and the agreement was good.

Influence of Inclusion Microgeometry on Some Thermomechanical Properties of Isotropic Polymer-Matrix Composites

1997 ◽  
Vol 119 (3) ◽  
pp. 242-250 ◽  
Author(s):  
J. Li ◽  
G. J. Weng
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Polymer Matrix Composites ◽  
Cyclic Creep ◽  
Cyclic Stress ◽  
Thermomechanical Properties ◽  
Stress Strain ◽  
Inclusion Shape ◽  
Effective Thermal Expansion

The influence of inclusion shape on some selected thermomechanical properties of isotropic viscoelastic composites is investigated by a micromechanical theory. These properties include: (i) the cyclic stress-strain behavior; (ii) cyclic creep; (iii) the master compliance curve; and (iv) the effective thermal expansion coefficient. It is found that these viscoelastic properties are all strongly dependent upon the inclusion shape. Specifically, under a strain-controlled cyclic loading the transient stress-strain curves of the composites all exhibit cyclic hardening behavior, but the level of flow stress reached is controlled by the inclusion shape. Except for the disk-reinforced case the per-cycle energy loss of the composite at 20 percent of inclusion concentration is found to be greater than the loss of the pure viscoelastic matrix. The complex shear modulus of the composite with various inclusion shapes is shown to lie on or within Milton and Berryman’s bounds (1997). Creep under cyclic stress tends to oscillate around the creep curve under a constant, mean stress for all inclusion shapes, with disks showing the greatest resistance. To uncover the influence of temperature, the creep compliance of the composite with a thermorheologically simple matrix is investigated and it is demonstrated that the compliance curves at various temperatures can all be plotted into a single master one on a reduced time scale. Finally, the effective thermal expansion coefficient of the composite is shown to be generally time-dependent, but the degree of time-dependence is low with spherical inclusions and very high with disks, others lying in-between.

Sign in / Sign up

Export Citation Format

Share Document