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Infrared Evaluation of Heat Generation During the Cyclic Deformation of a Cellular Al Alloy

Published online by Cambridge University Press:  10 February 2011

A. Rabiei ,
J. W. Hutchinson  and
A. G. Evans
A. Rabiei
Affiliation:
Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138
J. W. Hutchinson
Affiliation:
Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138
A. G. Evans
Affiliation:
Materials Institute, Princeton University, Princeton, NJ 08540
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Abstract

Heat generation from a notch during the compression-compression fatigue of a cellular Al alloy has been measured and compared with a model. The measurements indicate that heat is generated because of hysteresis occurring in narrow cyclic plastic zones outside the notch. This process continues until the notch closes. At closure, a brief period of heat generation arises because of friction along the notch faces. A plasticity model based on the Dugdale zone is shown to provide a reasonably accurate characterization of the heat generated, with the proviso that an “ineffective” zone be transposed onto the notch tip. It is found that the temperatures generated are too small to cause fatigue by thermal softening. A fatigue mechanism based on either geometric softening of the cells or crack growth in the cell walls is implied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 591 , 1999 , 135
Copyright
Copyright © Materials Research Society 2000

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References

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