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Impression Creep of a Sn-Pb Eutectic Alloy

Published online by Cambridge University Press:  15 February 2011

Fuqian Yang  and
J. C. M. Li
Fuqian Yang
Affiliation:
Materials Science Program, Department of Mechanical EngineeringUniversity of Rochester, Rochester, N.Y. 14627
J. C. M. Li
Affiliation:
Materials Science Program, Department of Mechanical EngineeringUniversity of Rochester, Rochester, N.Y. 14627
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Abstract

Impression creep tests on a Sn-Pb eutectic alloy showed a hyperbolic sine stress dependence of impressing velocity and an activation energy of 55 kJ/mole which is independent of the punching stress. A finite element simulation showed that this phenomena could be explained by a constitutive law in which the creep rate is also a hyperbolic sine function of stress. This simulation also gives an impressing velocity which is proportional to the punch size for the same punching stress. Then by using lubrication theory, it is possible to relate this constitutive law to an interphase shearing mechanism in which the rate of interphase shear is a hyperbolic sine function of the shear stress. This theory gives a creep rate which depends inversely on the third power of grain size at low stresses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 362: Symposium J – Grain-Size and Mechanical Properties--Fundamentals and Applications , 1994 , 19
Copyright
Copyright © Materials Research Society 1995

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