Mechanical Engineers: Help Designing a Solid Shaft

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SUMMARY

This discussion focuses on designing a solid shaft for a mechanical application involving a drive shaft rotating at 500 RPM and transmitting 200 HP to an 8-inch diameter gear. The design stresses are specified with a maximum tensile stress (σmax) of 134 ksi and a maximum shear stress (ζmax) of 40 ksi. Participants confirm that ζmax is indeed the limiting shear stress for this design. The torque transmitted by the shaft must be calculated to size the shaft appropriately using the maximum torsional stress as a primary consideration.

PREREQUISITES
  • Understanding of basic machine design principles
  • Knowledge of torque calculations in mechanical systems
  • Familiarity with material properties, specifically ductile materials
  • Experience with stress analysis, including tensile and shear stress
NEXT STEPS
  • Calculate the torque transmitted by the shaft using the formula: Torque = (HP × 5252) / RPM
  • Research solid shaft design standards and guidelines for ductile materials
  • Learn about the relationship between shear stress and torsional stress in shaft design
  • Explore software tools for mechanical design simulations, such as SolidWorks or ANSYS
USEFUL FOR

Mechanical engineers, design engineers, and students involved in machine design and shaft analysis will benefit from this discussion.

lilMissMindset
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to my fellow mechanical engineers, please help me with some basic machine design problems.

a certain drive shaft rotating at 500 rpm transmits 200 hp to an 8 inch diameter gear. Design a suitable solid shaft for this application. the shaft is ductile. Design stresses are to be limited to σmax= 134 ksi and ζmax = 40 ksi
 
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Is zeta max = 40 ksi supposed to be the limiting shear stress?

Anyway, figure out how much torque is to be transmitted by the shaft. Size the shaft using the max. torsional stress as a first cut.
 

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