Southwest Research Institute

John B Campbell

Thomas E Owen

David L Davidson

Andrew Nagy

A column assembly for use in conjunction with a test machine, for inducing high-cycle fatigue (at kilohertz vibration rates) in a specimen of a material under test. The column assembly has isolation masses, a specimen grip, and two actuators, the latter for imparting dynamic forces to the test specimen. The actuators are arranged on the column assembly asymmetrically relative to the test specimen.

Asymmetrical column assembly for high-cycle fatigue test machines

A fretting fixture accessory for a_test machine ( ) that induces high-cycle fatigue (at kilohertz vibration rates) in a specimen of a material under test. The fretting fixture ( ) is clamped to the test specimen ( ), for the purpose of testing for fretting damage. The fixture ( ) is designed to provide both the normal and shearing forces that result in fretting damage.

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San Antonio, TX, United States of America

John B Campbell