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Heat dissipation measurements in low stress cyclic loading of metallic materials: from internal friction to micro-plasticity

Heat dissipation measurements in low stress cyclic loading of metallic materials: from internal friction to micro-plasticity
Heat dissipation measurements in low stress cyclic loading of metallic materials: from internal friction to micro-plasticity
The present paper deals with a procedure to measure the very small quantities of heat generated during the very first cycles of mechanical loading on metallic specimens. A dedicated procedure is presented to reach the required sensitivity in terms of heat sources with some original features with respect to the present state of the art, assuming that the heat sources are uniformly distributed within the specimen as such low strain levels. Then steel (cold rolled and annealed) and aluminium specimens were tested at two different aspect ratios (R?=0.1 and R?=-1). It was shown that for small stress levels, the heat generated was more or less constant with cycle number. This energy was associated to visco-elastic behaviour (internal friction) and it was shown that the same energy could be measured with the two stress ratios when plotted against strain rate (stress amplitude at constant frequency, here 15 Hz). Then, after a certain stress level, an initial outburst of energy was evidenced over about 10–15 cycles before a constant level was reached again. This was associated to micro-plastic adaptation. This procedure provides an advanced tool to tackle the problem of very early fatigue damage detection and is aimed at providing some physical justification to the procedures of rapid fatigue limit detection by self-heating tests.

0167-6636
928-942
Maquin, F.
dbafb68f-65e1-44ce-bd01-8d82d3b82f51
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Maquin, F.
dbafb68f-65e1-44ce-bd01-8d82d3b82f51
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4

Maquin, F. and Pierron, F. (2009) Heat dissipation measurements in low stress cyclic loading of metallic materials: from internal friction to micro-plasticity. Mechanics of Materials, 41 (8), 928-942. (doi:10.1016/j.mechmat.2009.03.003).

Record type: Article

Abstract

The present paper deals with a procedure to measure the very small quantities of heat generated during the very first cycles of mechanical loading on metallic specimens. A dedicated procedure is presented to reach the required sensitivity in terms of heat sources with some original features with respect to the present state of the art, assuming that the heat sources are uniformly distributed within the specimen as such low strain levels. Then steel (cold rolled and annealed) and aluminium specimens were tested at two different aspect ratios (R?=0.1 and R?=-1). It was shown that for small stress levels, the heat generated was more or less constant with cycle number. This energy was associated to visco-elastic behaviour (internal friction) and it was shown that the same energy could be measured with the two stress ratios when plotted against strain rate (stress amplitude at constant frequency, here 15 Hz). Then, after a certain stress level, an initial outburst of energy was evidenced over about 10–15 cycles before a constant level was reached again. This was associated to micro-plastic adaptation. This procedure provides an advanced tool to tackle the problem of very early fatigue damage detection and is aimed at providing some physical justification to the procedures of rapid fatigue limit detection by self-heating tests.

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More information

e-pub ahead of print date: 16 April 2009
Published date: August 2009
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 210617
URI: https://eprints.soton.ac.uk/id/eprint/210617
ISSN: 0167-6636
PURE UUID: 6760d7fc-1465-4b61-b376-6e088cef9cd7
ORCID for F. Pierron: ORCID iD orcid.org/0000-0003-2813-4994

Catalogue record

Date deposited: 13 Feb 2012 10:36
Last modified: 06 Jun 2018 12:34

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Contributors

Author: F. Maquin
Author: F. Pierron ORCID iD

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