High-temperature fatigue of magnesia refractories

Conclusions A study was made of the fatigue of refractory MKhS and PShS at high temperatures. From the test results fatigue curves were constructed. It was found that with a reduction in the maximum stress there is an increase in the durability of the refractories.To characterize the refractories with respect to the fatigue curve it is desirable to determine the tentative limiting fatigue which in this case at 1000 cycles for refractories MKhS equals 0.44–0.68 of _comp. With an increase in the test temperature both the absolute and the relative limits of fatigue are reduced. The fatigue test results show that to increase the cyclic durability of refractory products it in necessary to reduce the acting cyclic stress. The data obtained enable us to predict the resistance of products working in conditions of controlled high temperatures and cyclic loading.Translated from Ogneupory, No. 8, pp. 51–54, August, 1972.