Author
Per-Lennart Larsson
Other affiliations: University of California, Berkeley, University of California, Santa Barbara
Bio: Per-Lennart Larsson is an academic researcher from Royal Institute of Technology. The author has contributed to research in topics: Indentation & Indentation hardness. The author has an hindex of 26, co-authored 123 publications receiving 3145 citations. Previous affiliations of Per-Lennart Larsson include University of California, Berkeley & University of California, Santa Barbara.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the theoretical foundation for the commonly used Vickers test was explored and the influence of large elastoplastic deformations was also assessed, based on the finite element method.
368 citations
TL;DR: In this article, the authors analyzed the Berkovich indentation test numerically, using the finite element method, and experimentally and derived universal formulae for the load-indentation depth relation and the hardness, as well as a detailed study of the mechanical fields involved at loading and unloading.
337 citations
TL;DR: In this paper, the authors used sharp indentation tests to explore how equi-biaxial residual stress and strain fields can be determined from the global properties, i.e., the size of the contact area between indenter and material and the hardness, given by such tests.
230 citations
TL;DR: In this paper, a viscoplastic framework is laid down for a wide class of constitutive properties where strain-hardening plasticity, creep and also nonlinear elasticity arise as special cases.
162 citations
TL;DR: In this paper, an experimental investigation has been carried out in order to study how residual stress and strain fields can be determined by sharp indentation testing, and the experimental results have been evaluated based on the findings in a parallel theoretical/numerical investigation.
154 citations
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TL;DR: In this article, the authors review the current understanding of the mechanics governing elastic-plastic indentation as they pertain to load and depth-sensing indentation testing of monolithic materials and provide an update of how they now implement the method to make the most accurate mechanical property measurements.
Abstract: The method we introduced in 1992 for measuring hardness and elastic modulus by instrumented indentation techniques has widely been adopted and used in the characterization of small-scale mechanical behavior. Since its original development, the method has undergone numerous refinements and changes brought about by improvements to testing equipment and techniques as well as from advances in our understanding of the mechanics of elastic–plastic contact. Here, we review our current understanding of the mechanics governing elastic–plastic indentation as they pertain to load and depth-sensing indentation testing of monolithic materials and provide an update of how we now implement the method to make the most accurate mechanical property measurements. The limitations of the method are also discussed.
6,616 citations
TL;DR: In this article, a comprehensive computational study was undertaken to identify the extent to which elasto-plastic properties of ductile materials could be determined from instrumented sharp indentation and to quantify the sensitivity of such extracted properties to variations in the measured indentation data.
1,299 citations
TL;DR: Zhu et al. as discussed by the authors provided a summary of the studies based on discrete particle simulation in the past two decades or so, with emphasis on the microdynamics including packing/flow structure and particle-particle, particle-fluid and particle wall interaction forces.
1,253 citations
TL;DR: In this article, the authors provide an overview of the basic concepts of scaling and dimensional analysis, followed by a review of some of the recent work on applying these concepts to modeling instrumented indentation measurements.
Abstract: We provide an overview of the basic concepts of scaling and dimensional analysis, followed by a review of some of the recent work on applying these concepts to modeling instrumented indentation measurements. Specifically, we examine conical and pyramidal indentation in elastic-plastic solids with power-law work-hardening, in power-law creep solids, and in linear viscoelastic materials. We show that the scaling approach to indentation modeling provides new insights into several basic questions in instrumented indentation, including, what information is contained in the indentation load-displacement curves? How does hardness depend on the mechanical properties and indenter geometry? What are the factors determining piling-up and sinking-in of surface profiles around indents? Can stress-strain relationships be obtained from indentation load-displacement curves? How to measure time dependent mechanical properties from indentation? How to detect or confirm indentation size effects? The scaling approach also helps organize knowledge and provides a framework for bridging micro- and macroscales. We hope that this review will accomplish two purposes: (1) introducing the basic concepts of scaling and dimensional analysis to materials scientists and engineers, and (2) providing a better understanding of instrumented indentation measurements.
980 citations
TL;DR: In this paper, a two types of calcium-silicate-hydrate (C-S-H) exist in cement-based materials, but less is known about how the two types affect the mechanical properties.
960 citations