Untersuchungen zum Bruchverhalten feuerfester Baustoffe mit einem Mini Keilspaltversuch

Translated title of the contribution: Investigation of the fracture behaviour of refractories with a mini wedge splitting test

Michael Pressler

Research output: ThesisMaster's Thesis

Abstract

In this thesis the fracture mechanical behaviour of industrial manufactured refractories is investigated by means of a mini wedge splitting test. The advantages of the mini wedge splitting test compared to the regular wedge splitting test are the more stable crack propagation, due to the smaller sample size, and the possibility to investigate the crack propagation with a microscope. Fracture mechanical parameters like specific fracture energy and notch tensile strength are calculated for magnesia, spinel and two zirconia products. The crack initiation is investigated with a stereo microscope and the crack propagation with digital image correlation. The results show that the mini wedge splitting test is suitable to investigate relative brittle materials like the two zirconia products, due to the fact that stable crack propagation is obtained. Also the crack initiation and propagation for aforementioned products is investigated with a stereo microscope. The load displacement curves, the fracture mechanical parameters und the results for crack initiation and propagation are shown. Furthermore, the fracture mechanical parameters of the mini wedge splitting test are compared to results from the wedge splitting test suggested by Tschegg. As expected, the results for the specific fracture energy for magnesia products are considerably lower for the mini wedge splitting test compared to the wedge splitting test suggested by Tschegg. This is due to a constrained fracture process zone in the mini wedge splitting test.
Translated title of the contributionInvestigation of the fracture behaviour of refractories with a mini wedge splitting test
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Gruber, Dietmar, Supervisor (internal)
Award date30 Jun 2017
Publication statusPublished - 2017

Bibliographical note

embargoed until null

Keywords

  • fracture machanics
  • refractories
  • magnesia
  • spinel
  • mini wedge splitting test
  • specific fracture energy
  • notch tensile strength
  • crack propagation
  • crack initiation
  • digital image correlation
  • DIC

Cite this