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Roller/Track Contact Stress |
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Given: Roller and track mechanism, with data as shown, to serve as guide for sliding door. Required: Determine the contact stresses occurring at the roller / track interface. |
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Door & Track Data: Maximum Door Weight, (lbf)..................: Overload Weight, (lbf).................: Door Width, (in).........................……..........: Door Height, (in)..........................……........: Roller Grove Diameter, (in)....................: Track Rod Diameter, (in)....................: Roller Pitch Diameter, (in)...............….....: Track Major Diameter, (in).....................: Orientation Angle, (radians)...................: Number of rollers ...........................…......: Roller Elastic Modulus, (psi)..........…......: Track Elastic Modulus, (psi)..........…......: Roller Poisson's Ratio ..................……......: Track Poisson's Ratio ..................……......: |
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Hinge Mechanical Properties: Roller - Approx. Min. Yield, (psi) of 4 in round, oil quench/temper to Rc 29..AISI 4140: Track - Approx. Min. Yield, (psi) of 1 in round, oil quench/temper to Rc 30.. AISI 4140: 1This value is an approximate minimum yield strength, Ymn, when quenched and tempered to the specified hardness. (Ref.: "Modern Steels & Their Properties", Bethlehem Steel Corporation, Handbook 3310, pg. 148). 2Approximate minimum yield, as drawn (Ref.: "Handbook of machining Data for Cold Finished Steel Bars", Republic Steel Corporation, 1973, pg.94.). |
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psi. |
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psi. |
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Roller / Track Cross Section |
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Ref: Boresi, Sidebottom, Seely, Smith, "Advanced Mechanics of Materials," Wiley & Sons, 3rd Edition, 1978, pg. 581-627. |