A novel push-pull machine for testing High cycle fatigue

Abstract

A novel machine designed and constructed to exert cyclic axial load for fatigue testing is herein reported. The main features of the test rig constitute the sinusoidal form of load wave and the stress - controlled, system of loading. Performance parameters comprise both static and alternating components of load as well as the frequency of load application. Typical results of tests run on steel C 60 and brass Ms 58 are presented. The experimentally determined endurance values, show consistency and good agreement with published data, thus, inspiring confidence in the test rig. The spectrum of material strength as influenced by cyclic loading, is herein displayed for the full range of the so-called "Dynamic Severity Criterion" first put forward by the author.