Topic
Indentation
About: Indentation is a research topic. Over the lifetime, 13002 publications have been published within this topic receiving 340476 citations.
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15 Sep 2004-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the authors present a deep-indentation finite element (FE) simulation and discuss an experimental technique for flat-ended cylindrical indentation, which is based on the use of cylinders with diameters up to 1mm and allows pressurepenetration curves to be drawn from which yield stress and elasticity modulus can be determined.
Abstract: The paper reviews the fundamentals of indentation theory for punches with cylindrical geometry, presents a deep-indentation finite element (FE) simulation and discusses an experimental technique for flat-ended cylindrical indentation. This technique is based on the use of cylindrical punches with diameters up to 1 mm and allows pressure–penetration curves to be drawn from which yield stress and elasticity modulus can be determined. Several materials have been tested including pure metals, steels and refractory alloys; yield stress has been determined and compared with literature values. By testing at different temperatures it was also possible to determine the ductile-to-brittle transition temperature (DBTT) for some alloys that show such phenomenon.
82 citations
TL;DR: In this article, an equivalent energy indentation model (EIM) was proposed to predict load-depth relation and reverse-predicting uniaxial stress-strain relation for ductile materials only based on loading part of indentation.
82 citations
TL;DR: In this article, a combination of the molecular dynamics simulations and theoretical calculations was used to study the adhesion of spherical and cylindrical nanoparticles on soft (gel-like) substrates.
Abstract: We study adhesion of spherical and cylindrical nanoparticles on soft (gel-like) substrates using a combination of the molecular dynamics simulations and theoretical calculations. The substrate deformation is obtained as a function of the gel shear modulus, nanoparticle size, surface tension of nanoparticles and substrate, and work of adhesion. It was shown recently that the classical JKR model can only be applied to describe nanoparticle adhesion on relatively stiff substrates. In this so-called adhesion regime the deformation of the substrate is determined by balancing the elastic energy of indentation and the work of adhesion between a nanoparticle and a gel. However, in the case of soft gels when substrates undergo moderate deformations the depth of the indentation produced by a nanoparticle is determined by the surface tension of the gel and the work of adhesion (the wetting regime). We present an analytical model describing crossover between adhesion and wetting regimes. In the framework of this mode...
82 citations
TL;DR: In this article, the development of Vickers indent-induced tracks with increasing indent load has been studied in two Y2O3-stabilizel ZrO2 ceramics.
Abstract: The development of Vickers indent-induced tracks with increasing indent load has been studied in two Y2O3-stabilizel ZrO2 ceramics. Such cracks form as radial or Palmqvist cracks at low loads, assume “kidney” shapes at intermediate loads, and finally form median (half-penny) cracks at high loads. The plastic zone directly beneath the indent is uncracked; a significant portion of the plasticity induced by indentation occurs by martensitic transformation.
82 citations
TL;DR: In this paper, the authors evaluate the validity of different definitions of both the indentation strain and the contact radius by applying the protocols on datasets generated from a finite element simulation of spherical indentation.
82 citations