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Experimental energy balance during the first cycles of cyclically loaded specimens under the conventional yield stress

Experimental energy balance during the first cycles of cyclically loaded specimens under the conventional yield stress
Experimental energy balance during the first cycles of cyclically loaded specimens under the conventional yield stress
This paper, as an extension of Maquin and Pierron (Mech Mater 41(8):928–942, 2009), presents an experimental procedure developed to macroscopically estimate the energy balance during the very first cycles of a uniaxially loaded metallic specimen at low stress levels. This energy balance is performed by simultaneously measuring the plastic input energy using a load cell and a strain gauge, and the dissipative energy using the temperature field provided by an infrared camera. Some experimental limitations led to restrain the present procedure to positive stress ratios, and to complement this energy balance by a second measurement while the material plastic work per cycle is negligible compared to the dissipative energy. Some results obtained on a cold rolled low carbon steel specimen are presented. First, a sensitivity study is undertaken to precisely determine the detection threshold on both thermal and plastic energies. Then, after having verified the homogeneity of the dissipative source fields, energy balances have been performed at different stress levels. It was thus confirmed that the slow variations of the dissipative sources occurring during the first cycles are due to micro-plastic adaptation, and that the dissipative sources remaining after some hundreds of cycles are due to viscoelastic (internal friction) phenomena. This procedure provides a better understanding of dissipation based approaches to fatigue found in the literature and an advanced tool to study viscoelastic phenomena in uniaxial loading
1741-2765
23-44
Connesson, N.
58d2d717-49e3-4f4d-82c8-d05f93d24883
Maquin, F.
dbafb68f-65e1-44ce-bd01-8d82d3b82f51
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Connesson, N.
58d2d717-49e3-4f4d-82c8-d05f93d24883
Maquin, F.
dbafb68f-65e1-44ce-bd01-8d82d3b82f51
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4

Connesson, N., Maquin, F. and Pierron, F. (2011) Experimental energy balance during the first cycles of cyclically loaded specimens under the conventional yield stress. Experimental Mechanics, 51 (1), 23-44. (doi:10.1007/s11340-010-9336-4).

Record type: Article

Abstract

This paper, as an extension of Maquin and Pierron (Mech Mater 41(8):928–942, 2009), presents an experimental procedure developed to macroscopically estimate the energy balance during the very first cycles of a uniaxially loaded metallic specimen at low stress levels. This energy balance is performed by simultaneously measuring the plastic input energy using a load cell and a strain gauge, and the dissipative energy using the temperature field provided by an infrared camera. Some experimental limitations led to restrain the present procedure to positive stress ratios, and to complement this energy balance by a second measurement while the material plastic work per cycle is negligible compared to the dissipative energy. Some results obtained on a cold rolled low carbon steel specimen are presented. First, a sensitivity study is undertaken to precisely determine the detection threshold on both thermal and plastic energies. Then, after having verified the homogeneity of the dissipative source fields, energy balances have been performed at different stress levels. It was thus confirmed that the slow variations of the dissipative sources occurring during the first cycles are due to micro-plastic adaptation, and that the dissipative sources remaining after some hundreds of cycles are due to viscoelastic (internal friction) phenomena. This procedure provides a better understanding of dissipation based approaches to fatigue found in the literature and an advanced tool to study viscoelastic phenomena in uniaxial loading

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More information

e-pub ahead of print date: 25 February 2010
Published date: 2011
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 210597
URI: http://eprints.soton.ac.uk/id/eprint/210597
ISSN: 1741-2765
PURE UUID: bcc524ab-8c25-483b-acfc-0063882a41c5
ORCID for F. Pierron: ORCID iD orcid.org/0000-0003-2813-4994

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Date deposited: 10 Feb 2012 15:22
Last modified: 15 Mar 2024 03:35

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Contributors

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

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