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Principal Stress Ratio Effect at Residual Stress Determination Utilizing the Variation of Indentation Hardness
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.). Royal Inst Technol, Dept Solid Mech, SE-10044 Stockholm, Sweden..ORCID iD: 0000-0001-6232-8819
2019 (English)In: Lubricants, ISSN 2075-4442, Vol. 7, no 6, article id 50Article in journal (Refereed) Published
Abstract [en]

The determination of residual stresses is an important issue when it comes to material failure analysis. The variation of global indentation properties, due to the presence of residual stresses, can serve as a guideline for the size and direction of such stresses. One of these global indentation properties, the material hardness, is unfortunately invariant of residual stresses when metals and alloys are at issue. In this situation, one has to rely on the size of the indentation contact area for residual stress determination. For other materials such as ceramics and polymers, where elastic deformations are of greater importance at indentation, such invariance is no longer present. Here, this variation is investigated based on finite element simulations. The aim is then to determine how the indentation hardness is influenced by the principal residual stress ratio and also discuss if such an influence is sufficient in order to determine the size and direction of such stresses in an experimental situation. It should be emphasized that this work does not suggest a new approach to residual stress determination (by indentation testing) but investigates the applicability of previously derived methods to a situation where the surface stress field is not simplified as equi-biaxial or uniaxial. For simplicity, but not out of necessity, only cone indentation of elastic-perfectly plastic materials is considered.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 7, no 6, article id 50
Keywords [en]
residual stress determination, hardness, correlation of indentation properties, principal stress influence, relative contact area
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-255575DOI: 10.3390/lubricants7060050ISI: 000475511800007Scopus ID: 2-s2.0-85068233582OAI: oai:DiVA.org:kth-255575DiVA, id: diva2:1340055
Note

QC 20190801

Available from: 2019-08-01 Created: 2019-08-01 Last updated: 2019-08-01Bibliographically approved

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Larsson, Per-Lennart

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