Wedge-Splitting Test on Carbon-Containing Refractories at High Temperatures

Martin Stückelschweiger, Dietmar Gruber, Shengli Jin, Harald Harmuth

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)


The mode I fracture behavior of ordinary refractory materials is usually tested with the wedge-splitting test. At elevated temperatures, the optical displacement measurement is difficult because of the convection in the furnace and possible reactions of refractory components with the ambient atmosphere. The present paper introduces a newly developed testing device, which is able to perform such experiments up to 1500 °C. For the testing of carbon-containing refractories a gas purging, for example, with argon, is possible. Laser speckle extensometers are applied for the displacement measurement. A carbon-containing magnesia refractory (MgO-C) was selected for a case study. Based on the results obtained from tests, fracture mechanical parameters such as the specific fracture energy and the nominal notch tensile strength were calculated. An inverse simulation procedure applying the finite element method yields tensile strength, the total specific fracture energy, and the strain-softening behavior. Additionally, the creep behavior was also considered for the evaluation.
Original languageEnglish
Article number3249
Number of pages10
JournalApplied Sciences : open access journal
Issue number16
Publication statusPublished - 8 Aug 2019


  • Carbon-containing refractories
  • Fracture energy
  • Fracture parameters
  • High-temperature wedge splitting test
  • Reducing condition
  • Strain-softening

Cite this