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A Unified Dimensionless Index for Characterizing Contact Deformation in Elastic-Plastic Layered Half-Spaces Open Access.

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Τίτλος: A Unified Dimensionless Index for Characterizing Contact Deformation in Elastic-Plastic Layered Half-Spaces Open Access.
Συγγραφείς: Cen, Jialiang1 artoscen@berkeley.edu, Komvopoulos, Kyriakos2 kyriakos@me.berkeley.edu
Πηγή: Journal of Applied Mechanics. Oct2026, Vol. 93 Issue 10, p1-8. 8p.
Θεματικοί όροι: *Material plasticity, *Dimensionless numbers, *Deformations (Mechanics), *Surface interactions, *Deformation of surfaces, *Mechanical behavior of materials
Περίληψη: The strongly coupled interactions among material properties, geometric characteristics, and applied load conditions necessitate a robust and broadly applicable methodology for predicting material response under contact loading. Although existing dimensionless parameters, such as the plasticity index, have been proven effective for monitoring the evolution of contact deformation in homogeneous materials, their direct application to layered systems is often inadequate because of the complex stress distributions and multi-material interactions inherent in layered media. This study addresses the challenge of characterizing the deformation state of layered half-spaces subjected to contact loading across the elastic, elastic-plastic, and fully plastic deformation regimes. Particular attention is given to systems consisting of either a compliant/soft or stiff/hard surface layer bonded to a substrate. To address this need, a new dimensionless deformation index is formulated to capture the complex mechanical response of layered elastic-plastic media. The proposed deformation index integrates elastic-plastic material properties, geometric contact characteristics, and deformation state into a unified dimensionless parameter that serves as a reliable indicator of plastic-deformation initiation and evolution. By establishing well-defined threshold values, the new index enables the delineation of the elastic, elastic-plastic, and fully plastic deformation regimes over a wide range of deformation levels, offering valuable insights into the evolution of subsurface plastic zones in layered half-spaces. The developed methodology provides an efficient framework for the analysis and design of engineering components and systems in which surface interactions govern performance, facilitating optimization of functionality, reliability, and service life across a broad spectrum of applications. [ABSTRACT FROM AUTHOR]
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  Data: A Unified Dimensionless Index for Characterizing Contact Deformation in Elastic-Plastic Layered Half-Spaces Open Access.
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  Data: <searchLink fieldCode="AR" term="%22Cen%2C+Jialiang%22">Cen, Jialiang</searchLink><relatesTo>1</relatesTo><i> artoscen@berkeley.edu</i><br /><searchLink fieldCode="AR" term="%22Komvopoulos%2C+Kyriakos%22">Komvopoulos, Kyriakos</searchLink><relatesTo>2</relatesTo><i> kyriakos@me.berkeley.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Applied+Mechanics%22">Journal of Applied Mechanics</searchLink>. Oct2026, Vol. 93 Issue 10, p1-8. 8p.
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  Data: *<searchLink fieldCode="DE" term="%22Material+plasticity%22">Material plasticity</searchLink><br />*<searchLink fieldCode="DE" term="%22Dimensionless+numbers%22">Dimensionless numbers</searchLink><br />*<searchLink fieldCode="DE" term="%22Deformations+%28Mechanics%29%22">Deformations (Mechanics)</searchLink><br />*<searchLink fieldCode="DE" term="%22Surface+interactions%22">Surface interactions</searchLink><br />*<searchLink fieldCode="DE" term="%22Deformation+of+surfaces%22">Deformation of surfaces</searchLink><br />*<searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink>
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  Data: The strongly coupled interactions among material properties, geometric characteristics, and applied load conditions necessitate a robust and broadly applicable methodology for predicting material response under contact loading. Although existing dimensionless parameters, such as the plasticity index, have been proven effective for monitoring the evolution of contact deformation in homogeneous materials, their direct application to layered systems is often inadequate because of the complex stress distributions and multi-material interactions inherent in layered media. This study addresses the challenge of characterizing the deformation state of layered half-spaces subjected to contact loading across the elastic, elastic-plastic, and fully plastic deformation regimes. Particular attention is given to systems consisting of either a compliant/soft or stiff/hard surface layer bonded to a substrate. To address this need, a new dimensionless deformation index is formulated to capture the complex mechanical response of layered elastic-plastic media. The proposed deformation index integrates elastic-plastic material properties, geometric contact characteristics, and deformation state into a unified dimensionless parameter that serves as a reliable indicator of plastic-deformation initiation and evolution. By establishing well-defined threshold values, the new index enables the delineation of the elastic, elastic-plastic, and fully plastic deformation regimes over a wide range of deformation levels, offering valuable insights into the evolution of subsurface plastic zones in layered half-spaces. The developed methodology provides an efficient framework for the analysis and design of engineering components and systems in which surface interactions govern performance, facilitating optimization of functionality, reliability, and service life across a broad spectrum of applications. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
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      – Type: doi
        Value: 10.1115/1.4072306
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 8
        StartPage: 1
    Subjects:
      – SubjectFull: Material plasticity
        Type: general
      – SubjectFull: Dimensionless numbers
        Type: general
      – SubjectFull: Deformations (Mechanics)
        Type: general
      – SubjectFull: Surface interactions
        Type: general
      – SubjectFull: Deformation of surfaces
        Type: general
      – SubjectFull: Mechanical behavior of materials
        Type: general
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      – TitleFull: A Unified Dimensionless Index for Characterizing Contact Deformation in Elastic-Plastic Layered Half-Spaces Open Access.
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            NameFull: Cen, Jialiang
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            NameFull: Komvopoulos, Kyriakos
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            – D: 01
              M: 10
              Text: Oct2026
              Type: published
              Y: 2026
          Identifiers:
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              Value: 93
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            – TitleFull: Journal of Applied Mechanics
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