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On the Influence of Elastic Deformation for Residual Stress Determination by Sharp Indentation Testing
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0001-6232-8819
2017 (English)In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 26, no 8, p. 3854-3860Article in journal (Refereed) Published
Abstract [en]

The determination of residual stresses in engineering materials using sharp indentation testing is studied analytically and numerically. The numerical part of the investigation is based on the finite element method. In particular, the effect from elastic deformations on global indentation properties is discussed in detail. This effect is essential when residual stresses are to be determined based on the change of the contact area due to such stresses. However, standard relations for this purpose are founded on the fact that the material hardness is invariant as regards residual (applied) stresses. Presently, this assumption is scrutinized and it is shown that it is only valid at dominating plastic deformation around the contact region. The hardness dependence of residual stresses can, however, be correlated in the same way as in the case of stress-free materials, indicating that the wealth of characterization formulas pertinent to indentation hardness is available also for the purpose of residual field determination. Only cone indentation of elastic-perfectly plastic materials is considered, but the generality of the results is discussed in some detail.

Place, publisher, year, edition, pages
Springer, 2017. Vol. 26, no 8, p. 3854-3860
Keywords [en]
elastic deformations, hardness values, residual stresses, sharp indentation
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-214345DOI: 10.1007/s11665-017-2816-2ISI: 000407994400024Scopus ID: 2-s2.0-85021998112OAI: oai:DiVA.org:kth-214345DiVA, id: diva2:1140470
Note

QC 20170912

Available from: 2017-09-12 Created: 2017-09-12 Last updated: 2017-11-10Bibliographically approved

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Larsson, Per-Lennart

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