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Influence of loading rate on fracture energy and maximum load of alumina-magnesia castables tested by wedge splitting method
Pages: 174-177
Year: Issue:  3
Journal: Refractories

Keyword:  wedge splitting methodfracture energymaximum loadloading ratealumina-magnesia castables;
Abstract: The wedge splitting tests of alumina-magnesia castables specimens at room temperature and 1 100 ℃were carried out with different loading rates to investigate the feasibility of wedge splitting method used for testing the fracture energy of refractory materials and the related influencing factors of the test re-sult.The loading rates at room temperature were 0.3,0.5,1,and 2 mm·min -1,and those at 1 100 ℃were 0.5,1,2,and 5 mm·min -1.The fracture energy of every specimen was calculated from the load-crack opening displacement curve.The relationship among loading rate,fracture energy,and the maximum load was discussed.The result shows that:(1)the maximum vertical load increases gradually with the increase of the loading rate at room temperature,and its increasing amplitude decreases gradually;the maximum vertical load increases first and then decreases at 1 100 ℃;(2)the fracture energy has the same change tendency with the maximum load;(3)the maximum loading rate is 0.5 mm·min -1 when the wedge split-ting method is used to test the fracture energy of refractory materials.
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