Stress relaxation in the extrusion of pastes

S. Chou; K. Sydow; P. J. Martin; J. Bridgwater; D. I. Wilson

doi:10.1016/S0955-2219(02)00159-0

Stress relaxation in the extrusion of pastes

S. Chou, K. Sydow, P. J. Martin, J. Bridgwater, D. I. Wilson

Research output: Contribution to journal › Article › peer-review

Abstract

Stress relaxation following the sudden halt of ram extrusion was studied over a range of die geometries and extrusion speeds using an alumina paste (solids volume fraction, ø=0.62) and a talc paste (ø=0.51). Distinctly different relaxation characteristics were observed. The alumina paste exhibited a rapid decay to give residual stresses in reasonable agreement with a model based on the pseudo-plastic rheological characterisation described by Benbow and Bridgwater. Although similar forces were required to extrude the talc paste, it showed a heavily damped decay with two time constants. The talc paste also continued to extrude slowly after the ram had stopped. This behavior was attributed to differences in ø and the contribution, and dissipation, of liquid pore pressures. However, increasing the solids volume fraction in the talc paste led to behaviour similar to that exhibited by the alumina paste. © 2002 Elsevier Science Ltd. All rights reserved.

Original language	English
Pages (from-to)	637-646
Number of pages	9
Journal	Journal of the European Ceramic Society
Volume	23
Issue number	5
DOIs	https://doi.org/10.1016/S0955-2219(02)00159-0
Publication status	Published - Apr 2003

Keywords

Al2O3
Extrusion
Forming
Paste
Relaxation
Talc
Visco-elasticity

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10.1016/S0955-2219(02)00159-0

Cite this

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title = "Stress relaxation in the extrusion of pastes",

abstract = "Stress relaxation following the sudden halt of ram extrusion was studied over a range of die geometries and extrusion speeds using an alumina paste (solids volume fraction, {\o}=0.62) and a talc paste ({\o}=0.51). Distinctly different relaxation characteristics were observed. The alumina paste exhibited a rapid decay to give residual stresses in reasonable agreement with a model based on the pseudo-plastic rheological characterisation described by Benbow and Bridgwater. Although similar forces were required to extrude the talc paste, it showed a heavily damped decay with two time constants. The talc paste also continued to extrude slowly after the ram had stopped. This behavior was attributed to differences in {\o} and the contribution, and dissipation, of liquid pore pressures. However, increasing the solids volume fraction in the talc paste led to behaviour similar to that exhibited by the alumina paste. {\textcopyright} 2002 Elsevier Science Ltd. All rights reserved.",

keywords = "Al2O3, Extrusion, Forming, Paste, Relaxation, Talc, Visco-elasticity",

author = "S. Chou and K. Sydow and Martin, {P. J.} and J. Bridgwater and Wilson, {D. I.}",

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doi = "10.1016/S0955-2219(02)00159-0",

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TY - JOUR

T1 - Stress relaxation in the extrusion of pastes

AU - Chou, S.

AU - Sydow, K.

AU - Martin, P. J.

AU - Bridgwater, J.

AU - Wilson, D. I.

N1 - Times Cited: 3

PY - 2003/4

Y1 - 2003/4

N2 - Stress relaxation following the sudden halt of ram extrusion was studied over a range of die geometries and extrusion speeds using an alumina paste (solids volume fraction, ø=0.62) and a talc paste (ø=0.51). Distinctly different relaxation characteristics were observed. The alumina paste exhibited a rapid decay to give residual stresses in reasonable agreement with a model based on the pseudo-plastic rheological characterisation described by Benbow and Bridgwater. Although similar forces were required to extrude the talc paste, it showed a heavily damped decay with two time constants. The talc paste also continued to extrude slowly after the ram had stopped. This behavior was attributed to differences in ø and the contribution, and dissipation, of liquid pore pressures. However, increasing the solids volume fraction in the talc paste led to behaviour similar to that exhibited by the alumina paste. © 2002 Elsevier Science Ltd. All rights reserved.

AB - Stress relaxation following the sudden halt of ram extrusion was studied over a range of die geometries and extrusion speeds using an alumina paste (solids volume fraction, ø=0.62) and a talc paste (ø=0.51). Distinctly different relaxation characteristics were observed. The alumina paste exhibited a rapid decay to give residual stresses in reasonable agreement with a model based on the pseudo-plastic rheological characterisation described by Benbow and Bridgwater. Although similar forces were required to extrude the talc paste, it showed a heavily damped decay with two time constants. The talc paste also continued to extrude slowly after the ram had stopped. This behavior was attributed to differences in ø and the contribution, and dissipation, of liquid pore pressures. However, increasing the solids volume fraction in the talc paste led to behaviour similar to that exhibited by the alumina paste. © 2002 Elsevier Science Ltd. All rights reserved.

KW - Al2O3

KW - Extrusion

KW - Forming

KW - Paste

KW - Relaxation

KW - Talc

KW - Visco-elasticity

U2 - 10.1016/S0955-2219(02)00159-0

DO - 10.1016/S0955-2219(02)00159-0

M3 - Article

SN - 0955-2219

VL - 23

SP - 637

EP - 646

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 5

ER -

Stress relaxation in the extrusion of pastes

Abstract

Keywords

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