Sideframe with increased fatigue life having longer cross-sectional thickness transition zone
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United States of America Patent
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Apr 26, 1994
Grant Date -
N/A
app pub date -
Jun 17, 1993
filing date -
Jun 17, 1993
priority date (Note) -
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Abstract
The present invention involves structurally changing an American Association of Railroads (AAR) standard 100 ton sideframe so that it is statically and dynamically capable of handling a 110 ton payload; this is accomplished by reducing two weak points on the sideframe. The first weak point is located in the sideframe upper compression member, near the vertical support column, and the second weak point is the upper portion of the area comprising the lower diagonal tension member core support hole. Stresses in the this area are reduced by gradually extending the zone where cross-sectional wall thicknesses normally experience an abrupt change. The gradual decrease in cross-sectional areas increases the static strength of the sideframe by increasing the elastic or ultimate loading limits. In the second area metallic mass is added, thereby increasing the section modulus of the sideframe near the core support hole. Increasing the section modulus increases the number of flexure stresses which the improved AAR standard 100 ton sideframe can withstand, allowing this sideframe to meet AAR dynamic testing standards set for a 100 ton sideframe, even though it's loaded with 110 tons of payload.
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