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: An analytical relationship between the reduced modulus E-r and hardness H for solid materials is established based on the conventional depth-sensing indentation method of Oliver and Pharr as mentioned in this paper.
272 citations
TL;DR: In this article, the authors applied the finite element technique to study the very complex stress-strain field of thin hard coatings subjected to a nano-indentation process, and the results showed that the ABAQUS finite element software package is capable of reproducing the loading-unloading behavior of a nano indentation test.
271 citations
TL;DR: In this paper, the relationship between indentation pressure produced by cones, pyramids and spheres and the mechanical properties of elastic-plastic materials is considered, based on previous work which uses the expansion of a cavity in an elasticplastic material, and an improved correlation with experimental results is obtained if it is assumed that the hemispherical core is a region in which the stresses are changing from purely hydrostatic to values which satisfy the Von Mises yield criterion.
Abstract: The relationship between indentation pressure produced by cones, pyramids and spheres, and the mechanical properties of elastic-plastic materials is considered, based on previous work which uses the expansion of a cavity in an elastic-plastic material. According to the earlier model, there are three zones: a hydrostatic 'core' of which the indenter is embedded; a hemispherical shell, where plastic flow is taking place; and beyond this the elastic hinterland. An improved correlation with experimental results is obtained if it is assumed that the hemispherical core is a region in which the stresses are changing from purely hydrostatic to values which satisfy the Von Mises yield criterion. A further improvement results if a correction is made for the lack of geometric similarity of the strain field in indentations by spheres.
269 citations
TL;DR: In this paper, a simulation study of the initial stages of indentation using the embedded atom method (EAM) is presented, and a comparison is made between atomistic simulations and continuum models for elastic deformation.
Abstract: Nanoindentation experiments have shown that microstructural inhomogeneities across the surface of gold thin films lead to position-dependent nanoindentation behavior [Phys. Rev. B (2002), to be submitted]. The rationale for such behavior was based on the availability of dislocation sources at the grain boundary for initiating plasticity. In order to verify or refute this theory, a computational approach has been pursued. Here, a simulation study of the initial stages of indentation using the embedded atom method (EAM) is presented. First, the principles of the EAM are given, and a comparison is made between atomistic simulations and continuum models for elastic deformation. Then, the mechanism of dislocation nucleation in single crystalline gold is analyzed, and the effects of elastic anisotropy are considered. Finally, a systematic study of the indentation response in the proximity of a high angle, high sigma (low symmetry) grain boundary is presented; indentation behavior is simulated for varying indenter positions relative to the boundary. The results indicate that high angle grain boundaries are a ready source of dislocations in indentation-induced deformation.
269 citations
TL;DR: In this paper, a general theory for axisymmetric indentation of piezoelectric solids within the context of fully coupled, transversely isotropic elasticity models is presented.
268 citations