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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TL;DR: In this paper, the authors link the indentation size effect (ISE) to a ratio between the energy of newly created surface and plastic strain energy dissipation, and propose an analytical model of hardness versus depth.
Abstract: For very shallow indentations in W, Al, Au, and Fe-3wt%Si single crystals, hardness decreased with increasing depth irrespective of increasing or decreasing strain gradients. As such, strain gradient theory appears insufficient to explain the indentation size effect (ISE) at depths less than several hundred nanometers. Present research links the ISE to a ratio between the energy of newly created surface and plastic strain energy dissipation. Also, the contact surface to plastic volume ratio was nearly constant for a range of shallow depths. Based on the above, an analytical model of hardness versus depth provides a satisfactory fit to the experimental data and correlates well with embedded atom simulations. ©2002 ASME
253 citations
TL;DR: In this article, the microstructure, tensile properties, and creep behavior of Mg-(1-10)wt%Sn alloys were studied, and it suggested that the indentation creep resistance of mg-sn alloys could be obviously improved with the increase of tin content.
252 citations
TL;DR: In this article, the uniqueness of the indentation test was studied and the existence of "mystical materials" which have distinct elastoplastic properties yet they yield almost identical indentation behaviors, even when the indenter angle is varied in a large range.
Abstract: Indentation is widely used to extract material elastoplastic properties from the measured force–displacement curves. One of the most well-established indentation techniques utilizes dual (or plural) sharp indenters (which have different apex angles) to deduce key parameters such as the elastic modulus, yield stress, and work-hardening exponent for materials that obey the power-law constitutive relationship. However, the uniqueness of such analysis is not yet systematically studied or challenged. Here we show the existence of “mystical materials”, which have distinct elastoplastic properties yet they yield almost identical indentation behaviors, even when the indenter angle is varied in a large range. These mystical materials are, therefore, indistinguishable by many existing indentation analyses unless extreme (and often impractical) indenter angles are used. Explicit procedures of deriving these mystical materials are established, and the general characteristics of the mystical materials are discussed. In many cases, for a given indenter angle range, a material would have infinite numbers of mystical siblings, and the existence maps of the mystical materials are also obtained. Furthermore, we propose two alternative techniques to effectively distinguish these mystical materials. The study in this paper addresses the important question of the uniqueness of indentation test, as well as providing useful guidelines to properly use the indentation technique to measure material elastoplastic properties.
251 citations
TL;DR: In this article, the authors presented analytical and computational results for the evolution of stresses and deformation fields due to indentation from a rigid axisymmetric indentor on an elastic substrate.
250 citations
TL;DR: In this article, a finite element model was developed, composed of shell elements representing outside casing, and solid elements for the active material with a binder lumped together with the current collectors and the separator.
249 citations