Effect of viscous flow on the thermal residual stresses in a monofilament SiC/borosilicate glass composite

1995 ◽  
Vol 30 (1) ◽  
pp. 69-74 ◽  
Author(s):  
M. Barsoum ◽  
A. Elkind
Keyword(s):  
Residual Stresses ◽  
Viscous Flow ◽  
Borosilicate Glass ◽  
Glass Composite ◽  
Thermal Residual Stresses

Densification kinetics of binary borosilicate glass composite

1994 ◽  
Vol 9 (2) ◽  
pp. 486-492 ◽  
Author(s):  
Jau-Ho Jean ◽  
Tapan K. Gupta
Keyword(s):  
Activation Energy ◽  
Viscous Flow ◽  
Borosilicate Glass ◽  
Critical Value ◽  
Energy Estimates ◽  
Glass Composite ◽  
Densification Mechanism ◽  
Microstructural Observation ◽  
High Silica ◽  
Kinetics Of

Densification kinetics and mechanism of a binary borosilicate glass composite, containing low-softening borosilicate (BSG) and high-softening high silica (HSG) glasses, have been studied. Apparent activation energy of densification varies from 200 to 400 kJ/mol, and decreases with increasing BSG content at a given densification factor. At a given BSG content, the activation energy of densification initially remains relatively unchanged with increasing densification factor (DF), but increases with densification when DF reaches a critical value (DF∗). Moreover, the value of DF∗ increases with increasing BSG content. From the activation energy estimates of densification, it is concluded that the predominant densification mechanism for BSG ≥ 30 vol. % with DF < DF∗ is viscous flow of low-softening BSG. For BSG ≥ 30 vol. % with DF < DF∗ and BSG ⋚ 20 vol. % with all DF investigated, the activation energies are within the range governed by viscous flow of both BSG and HSG, indicating that the densification is controlled by viscous flow of a new glass with a composition between BSG and HSG. The latter evidence stems from the microstructural observation that as sintering proceeds, the HSG particle undergoes an extensive dissolution process.

scholarly journals Thermal Residual Stresses in Bonded Dissimilar Materials and Their Singularities

1996 ◽  
Vol 39 (2) ◽  
pp. 197-203 ◽  
Author(s):  
Seiji IOKA ◽  
Shiro KUBO ◽  
Kiyotsugu OHJI ◽  
Jun-ichi KISHIMOTO
Keyword(s):  
Residual Stresses ◽  
Dissimilar Materials ◽  
Thermal Residual Stresses

Prediction of Process Induced Thermal Residual Stresses in Injection Molded Composites

1989 ◽  
Vol 2 (4) ◽  
pp. 319-333 ◽  
Author(s):  
Rushad F. Eduljee ◽  
John W. Gillespie ◽  
Roy L. Mccullough
Keyword(s):  
Residual Stresses ◽  
Thermal Residual Stresses ◽  
Injection Molded

Finite Element Analysis of the Thermal Residual Stresses of Diamond Cutting Tools in the Sintering Process

2008 ◽  
Vol 587-588 ◽  
pp. 695-699 ◽  
Author(s):  
Luís G. Reis ◽  
Pedro M. Amaral ◽  
Bin Li ◽  
Carlos A. Anjinho ◽  
Luís Guerra Rosa ◽  
...  
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Diamond Tool ◽  
Diamond Particle ◽  
Elastic Behaviour ◽  
Tensile Behaviour ◽  
Sintering Process ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Thermal Residual Stresses

The main objective of the present work is to present and discuss the effects of the residual stresses generated in the matrix. Both, elastic and elastic-plastic models using explicit finite element code Abaqus were developed to investigate the thermal residual stresses generated around a diamond particle embedded in a metal matrix (a binder) during the sintering process for obtaining a diamond tool. The first part of the work consists in examining the thermal residual stress field generated by using three sintering temperatures from which the bodies are cooled from (T1=800°C, T2=700°C and T3=600°C) and two diamond shapes modelled with 2D axisymmetric elements, one from a circle the other from an octagon, respectively. In this case only one type of binder showing typical elastic behaviour is considered. The second part of this work consists in comparing the finite element solutions using binders with different tensile behaviour (elastic vs. elastic-plastic behaviour). This last study has used a particle shape generated from the octagon, since this shape allows, in a great number of real situations, the simulation of a particle with a larger number of facets, in line with what it is observed when looking at a conventional diamond tool.

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