Accession Number : ADD017747

Title :   Apparatus for Conducting Fatigue Tests Using a Conventional Lathe Device.

Descriptive Note : Patent, Filed 1 Mar 95, patented 5 448 917,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Maciejewski, Wendell C

Report Date : 12 Sep 1995

Pagination or Media Count : 9

Abstract : Apparatus is provided for conducting flexure tests on a rectangular test beam. The apparatus includes a bearing apparatus, a support structure for supporting a beam for deflection, and a deflection guide for flexing the test beam at a predetermined point. The bearing apparatus includes a pintle and a roller bearing axially mounted on a first end of the pintle. The second end of the pintle is mounted in the jaws of the chuck lathe for eccentric rotation of the roller bearing. The support structure includes two locating brackets for supporting the ends of the test beam. The support structure further includes caging apparatus for caging movement of the test beam. The deflection guide is positionable on top of the test beam between the locating brackets, so that a central impeller element faces the upper surface of the test beam. When the bearing makes contact with the deflection guide during eccentric rotation the impeller element engages and flexes the test beam at a mid-point thereof. The supporting and caging structures are constructed and arranged so that the test beam is not constrained along any surface thereof. The apparatus may further include a mechanical cycle counter for counting the revolutions or cycles of the lathe device. (MM)

Descriptors :   *TEST EQUIPMENT, *FATIGUE TESTS(MECHANICS), *PATENTS, *LATHES, BEAMS(STRUCTURAL), DEFLECTION, RECTANGULAR BODIES, FLANGES, SUPPORTS, ROLLER BEARINGS, ROTATION, FLEXURAL PROPERTIES, ECCENTRICITY, MOUNTING BRACKETS, PINTLES, IMPELLERS, MANDIBLE

Subject Categories : Machinery and Tools
      Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE