Upsetting Tests of Fresh Cementitious Composites for Extrusion
Publication: Journal of Engineering Mechanics
Volume 132, Issue 2
Abstract
Upsetting tests were conducted on cylindrical specimens made of a typical fresh short fiber-reinforced cementitious composite (SFRCC) paste for extrusion at various boundary conditions to derive the paste’s constitutive behavior. Due to friction present at the specimen and the equipment platens interfaces, stress was not uniformly distributed in the specimen and had to be corrected. In this study, two analytical methods were utilized to derive the true flow stress of the fresh SFRCC paste through correcting the nominal yield stress obtained from the upsetting test. One of them was the stress extrapolation method, which required a large number of experimental data and predetermined boundary friction. It was found that the results corrected by this method from experiments at the lubricated boundary were more reliable than those at the dry boundary and this method could also give an approximate estimation of the boundary friction coefficient. As comparison, the flow stress correction method required only a small amount of experimental data and no predetermined boundary friction. It was found that this method provided better results at the dry boundary than at the lubricated boundary. The fresh SFRCC paste exhibited both strain and strain rate hardening characteristics whereas strain rate hardening effect was more significant and dominated.
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Acknowledgments
The financial support from Hong Kong Research Grant Council under Grant No. UNSPECIFIEDHKUST 6226/01E is gratefully acknowledged. The writers would also thank KURARAY Co. Ltd. for providing the short PVA fibers.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 132 • Issue 2 • February 2006
Pages: 149 - 157
Copyright
© 2006 ASCE.
History
Received: Aug 17, 2004
Accepted: Mar 21, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
Notes
Note. Associate Editor: Eric N. Landis
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