Fractographic and fracture mechanical investigations of refractories under different loading conditions
Crack initiation and propagation have been investigated under tensile and shear loading in ceramically and carbon bonded refractories.A wedge splitting test procedure and a modified shear test have been applied.Test results have been used for material characterization especially with respect to brittleness.Furthermore a microscopic fractographic test procedure was developed and applied on fractured test specimens.In order to explain brittleness dependence on structure properties correlation of fractographic and fracture mechanical resuits has been evaluated.Frequently brittleness reduction is achieved by a lower amount of transgranular crack propagation associated with a strength decrease while maintaining specific fracture energy unchanged.Deviations form pure linear fracture mechanics increase with decreasing brittleness and contribute to specific fracture energy.Shear specimens may show two generations of cracks,a first one initiated by tensile loads (stable propagation) and a second one by shear loads (unstable propagation).
H.Harmuth E.K.Tschegg
Chair of Ceramics, Montanuniversitaet Leoben, A-8700 Leoben, Austria Institute of Building Construction and Technology, Vienna University of Technology, A-1040 Wien, Aus
国际会议
The 6th International Symposium on Refractories (第六届国际耐火材料会议)
郑州
英文
485-488
2012-10-18（万方平台首次上网日期，不代表论文的发表时间）