{"id":95187,"date":"2018-03-11T10:15:05","date_gmt":"2018-03-11T10:15:05","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/micromechanical-analysis-of-indentation-experiments-in-metallic-single-crystals-and-isotropic-polycrystals\/"},"modified":"2018-03-11T10:15:05","modified_gmt":"2018-03-11T10:15:05","slug":"micromechanical-analysis-of-indentation-experiments-in-metallic-single-crystals-and-isotropic-polycrystals","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/modelos-numericos-de-la-atmosfera\/micromechanical-analysis-of-indentation-experiments-in-metallic-single-crystals-and-isotropic-polycrystals\/","title":{"rendered":"Micromechanical analysis of indentation experiments in metallic single crystals and isotropic polycrystals"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Ovidi Casals Boixados <\/strong><\/h2>\n<p>Advanced mechanical applications and structural integrity assessments rely on advanced tools to probe local mechanical properties. Inthis context,  indentation techniques constitute an appealing alternative tool to conventional uniaxial tests for the assessment of fundamental properties that are  crucial for mechanical design. Significant research efforts are directed to determine the viability of new methodologies to evaluate mechanical properties  from contact parameters measured in hardness tests and more advanced instrumented indentation techniques. With the enhancement of computational  capabilities, it is also possible to conduct extensive 3-d simulations of pyramidal indentation experiments. Finite element simulations provide amethod  for virtual material testing, where prior dimensional analysis illustrate the dependency between indentation parameters and mechanical properties. The  combination of dimensional analysis and simulations give a detailed mathematical description to the indentation experiment which is required for the  development of methodologies for mechanical property evaluations.    some of these methodologies have shown to be useful in the characterization of the elastic behavior of materials. Assessment of elasto-plastic  mechanical properties has also been addressed by different authors prior or during the course of this investigation. In spite of this, application of the  aforementioned methods is still limited by their accuracy and actual range of validity. The lack of accuracy may be related to  the precision of the mathematical formulations describing the indentation experiments, as well as to the convenience of the constitutive model selected for computational  analysis at a given indentation length scale. In this regard, indentation experiments performed at different loads provide information on the various deformation phenomena occurring at the different material length scales ranked during the indentation experiment. All these factors strongly condition  the interpretation of experimental results, which are thus extremely sensitive to the development of so-called indentation size effects.    the present dissertation concerns the indentation of metallic polycrystalline aggregates and single crystals through continuum mechanics theories.  efforts are first directed to the development of a new methodology for mechanical property extractions from instrumented indentation techniques in  imprints made at sufficiently large loads, which encompass a representative number of grains. The work is predicated on comprehensive dimensional  analysis and extensive finite element simulations of pyramidal (vickers and berkovich) and conical indentation of strain hardening solids. Theresulting  intrinsic duality of mechanical property extractions from instrumented indentation experiments is related to the lack of measurement of the amount of  pileup or sinking-in, which cannot be fully compensated through further analysis of the p-hs curve. This work also shows that qualitative observations on  whether bulging or pincushion effects occur around the imprint are sufficient to establish which of the two potential sets of inferred properties  corresponds to the indented material.    the second part of this thesis is devoted to the analysis of experiments performed at the micro-indentation range. An effort is herein made to use crystal  plasticity models to understand pyramidal indentation experiments made within single crystals. Issues under examination are the physical consistency  of the continuum crystal plasticity theories in the modeling of indentation experiments, and the influence of crystal slip anisotropy and of prior straining  on the dislocation density patterns underneath sharp indenters.. Agreement between experiments and simulations is predicated in terms of hardness,  instrumented indentation applied load (p)-penetration depth (hs) curves, and material pileup and sinking-in development at the contact boundary.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Micromechanical analysis of indentation experiments in metallic single crystals and isotropic polycrystals<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Micromechanical analysis of indentation experiments in metallic single crystals and isotropic polycrystals <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Ovidi Casals Boixados <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 13\/07\/2009<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Jorge Alcal\u00e1 Cabrelles<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: enrique Fern\u00e1ndez aguado <\/li>\n<li>  (vocal)<\/li>\n<li>  (vocal)<\/li>\n<li>  (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Ovidi Casals Boixados Advanced mechanical applications and structural integrity assessments rely on advanced tools to probe local [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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