Abstract
Static and cyclic fatigue tests were made on borosilicate glass and two kinds of silicon nitride, SNA and SNB, under static tensile loading and tension-compression cyclic loading under the stress ratios R = 0 and -1, by using an apparatus specially designed with a device to minimize the load eccentricity. Crack growth tests were also made under static loading and cyclic loading. Increase in crack growth rate due to cyclic loading was observed both in SNA and SNB, though degradation in strength of smooth round bar specimens due to cyclic loading was observed only in SNB and not in SNA and borosilicate glass. The values of da/dt, as a function of K, of small cracks obtained from the tensile test on smooth round bar specimens showed much higher values than those of large cracks obtained from the crack growth tests.
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