Measuring and testing – Testing by impact or shock – Specimen impactor detail
Patent
1999-07-09
2000-04-18
Noori, Max
Measuring and testing
Testing by impact or shock
Specimen impactor detail
73 1206, G01N 330
Patent
active
060501278
ABSTRACT:
An apparatus and method for impact response testing of materials such as magnetic discs of a disc drive. The apparatus of the present invention supports a target disc in cooperative relationship with a sub-millimeter impact test ball such that the test ball can be dropped on selected portions of the target disc from selected heights above the target disc. The apparatus permits the method of observing the characteristics of a detent made in the target disc, by use of a high resolution surface profiler, and interpolating the observed characteristics to analytical standards which, for a given test ball size and drop height, indicate the dynamic hardness of the target disc at that test location. A vacuum is used to support the test ball above the disc, and a vacuum release valve is provided to negate the vacuum and release the test ball.
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Y. Tirupataiah, B. Venkataraman and G. Sundarajan, The Nature of the Elastic Rebound of a Hard Ball Impacting on Ductile Metallic Target Materials, Materials Science and Engineering, vol. A124, pp. 133-140, 1990.
G. Sundarajan and P.G. Shewmon, The Use of Dynamic Impact Experiments in the Determination of the Strain Rate Sensitivity of Metals and Alloys, Acta Metallurgica, vol. 31, pp. 101-109, 1983.
I.M. Hutchings, Strain Rate Effects in Microparticle Impact, Journal of Physics D (Applied Physics), vol. 10, pp. L179-L-184, 1977.
Pexton Harold Weaver
Rao Mukund Channagiri
Noori Max
Seagate Technology Inc.
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