Abstract
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.
Highlights
The wedge-splitting test is performed on notched prismatic specimens that enable stable crack formation for relatively large specimens [1,2]
Is a temperature-dependent function and the parameters n and a are the stress and strain exponents, respectively. These parameters were implemented in the simulation of the wedge-splitting test and the creep behavior was considered in the whole specimen volume
A new testing device to perform the wedge-splitting test (WST) was introduced in this paper
Summary
The wedge-splitting test is performed on notched prismatic specimens that enable stable crack formation for relatively large specimens [1,2]. The performance of the wedge splitting test at room shadow cast by the sample against the light source is recorded by a high-resolution complementary temperature with optical displacement measurement is state of the art [4], at elevated temperatures, metal-oxide-semiconductor (CMOS) camera [3]. With this method, the displacement is measured on the optical measurement is far more difficult due to the radiation and convection in the furnace one side of the sample only. The features of the new device and the fracture a resin-bonded magnesia carbon material at elevated temperatures are discussed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
