Kristallplastizitätsbasierte Finite Elemente Modellierung mikromechanischer Experimente

Translated title of the contribution: Crystal plasticity based finite element modelling of micromechanical experiments

Helene Waldl

Research output: ThesisMaster's Thesis

Abstract

The aim of this master thesis is to gain knowledge on crystal plasticity by means of finite element modelling of selected micromechanical experiments, expressed in terms of force-displacement curves and in terms of local stresses and strains on the microstructure level. To this end a micro-pillar compression test, a nano-indentation test and a micro-cantilever test are simulated in Abaqus and are compared with the results of micromechanical experiments. The three selected test types differ in the expected stress distributions in the deformed area, and in the type of boundary condition, e.g. the force application. Each test is modelled with different boundary conditions in order to study their influences. Here the objective is to ascertain if a crystal plasticity material model, with a well-defined set of parameters, can be used for the simulation of different experiments. The simulations are performed with the finite element software Abaqus/Standard. The material behaviour is provided by the material library of the finite element interface Zmat. The material for the experiments is a solution-annealed nickel-base alloy. The material parameters for the simulation are taken from pure nickel. This is valid due to the strong similarities of pure nickel with this solution-annealed alloy. Starting with literature data a crystal plasticity model is set up and calibrated using the force-displacement curves of the micro-pillar compression test. With the so-developed material model, the nano-indentation as well as the micro-cantilever experiments are simulated subsequently.
Translated title of the contributionCrystal plasticity based finite element modelling of micromechanical experiments
Original languageGerman
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Antretter, Thomas, Supervisor (internal)
  • Orthaber, Markus, Co-Supervisor (internal)
Award date28 Jun 2019
Publication statusPublished - 2019

Bibliographical note

embargoed until null

Keywords

  • crystal plasticity
  • FEM
  • micro-pillar
  • nano-indentation
  • micro-cantilever

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