Mechanical characterization of porous ceramics by spherical instrumented indentation technique
type: Dataset
description: The objective of this study is to develop a methodology to characterize the mechanical behaviour of porous inorganic materials. Spherical instrumented indentation tests were used to determine the mechanical properties of a model material, gypsum, with two different porosities (30 and 60% vol.). Classical analytical methods, initially developed for nano-indentation, were used to extract the hardness and the elastic modulus of both materials, as well as stress-strain indentation curves. A methodology has been detailed in order to apply spherical indentation test to study high porous ceramics. To complete this analytical analysis, a numerical approach is used to identify an elastoplastic constitutive law for the material model. A 2D axisymmetric finite element model was developed to simulate spherical indentation tests. An inverse identification module, MIC2M, was then used to identify parameters associated to Drücker-Prager criterion (cohesion, friction and dilatancy) by minimizing the error between the experimental and the simulated indentation curves. These parameters were validated through the numerical simulation of a Vickers indentation test. Uniaxial compression and oedometer tests were also carried out on cylindrical samples to estimate the accuracy of the identified parameters. The mechanisms occurring during indentation were investigated using RX tomography and SEM. A large densified zone was noted below the indented area, with extensive gypsum crystal fracture. No macroscopic brittle crack could be observed confirming the differences between the mechanical behaviour of high porous ceramics and dense ceramics. The methodology developed in this study was applied to calcium phosphate cements, widely used for bone substitution. In-vitro degradation tests were performed on cylindrical samples of cements during 2 months into a refreshed Phosphate Buffered Saline solution. The micro-indentation method was enabled to follow mechanical properties of degraded samples …
landing page: https://theses.hal.science/tel-00961208
identifier: NNT: 2013ISAL0030
keyword: caracterisation
keyword: cement
keyword: ceramics
keyword: characterization
keyword: ciment
keyword: finite-element-method
keyword: gypsum
keyword: indentation-spherique
keyword: infoeu-reposemanticsdoctoralthesis
keyword: inorganic-porous-material
keyword: inverse-method
keyword: materiau-ceramique
keyword: materiau-poreux-inorganique
keyword: mechanical-properties
keyword: methode-des-elements-finis
keyword: methode-inverse
keyword: nanoindentation
keyword: platre
keyword: porosite
keyword: porosity
keyword: propriete-mecanique
keyword: spherical-indentation
keyword: spiotherengineering-sciences-physicsother
keyword: theses
issued: 2026-05-05T23:53:26.099737
modified: 2026-05-05T23:53:26.099742
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Mechanical characterization of porous ceramics by spherical instrumented indentation technique
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00961208
issued: 2026-05-05T23:53:26.167573
modified: 2026-05-05T23:53:26.060105