MAchine Design FA1

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Across
  1. 5. Codes like IS, DIN, ASME used in design to ensure safety and interchangeability.
  2. 11. A plate with central hole has stress concentration factor 3. If nominal stress = 70 MPa, what is the maximum stress in multiples of 10 MPa?
  3. 12. A 2 m long shaft of 40 mm dia transmits 1 kN·m torque. With G = 80 GPa, calculate twist in radians.
  4. 14. Systematic process of minimizing weight while maintaining required strength and safety.
  5. 15. A 70 mm dia shaft carries torque 10 kN·m. Compute maximum shear stress in MPa.
  6. 17. A rod designed for 100 MPa permissible stress must carry a 35 kN load. What minimum cross-sectional area in mm² is required?
  7. 18. Formula relating torque, shear stress, polar moment, shear modulus, and twist angle.
  8. 19. A shaft experiences 2×10⁵ cycles with life 3×10⁵ and 6×10⁵ cycles with life 10⁶. Compute Miner’s cumulative damage fraction.
  9. 20. Failure criterion that considers mean stress and alternating stress using ultimate strength.
Down
  1. 1. A bar of length 2 m and cross-section 100 mm² is loaded with 50 kN. With E = 200 GPa, find elongation in m.
  2. 2. Conservative fatigue design criterion based on yield stress and endurance limit.
  3. 3. Special spline type used for smooth torque transmission with reduced stress concentration.
  4. 4. Common cause of coupling failure in high-speed shafts.
  5. 6. A component has σult = 700 MPa, yield strength = 420 MPa, and endurance limit = 280 MPa. By Soderberg, what is allowable alternating stress for σmean = 140 MPa in MPa?
  6. 7. A rotating shaft with σmean = 50 MPa and σalt = 100 MPa is checked by Goodman for σult = 600 MPa and σe = 250 MPa. Find factor of safety.
  7. 8. A steel rod of diameter 16 mm carries a tensile load of 50 kN. Calculate maximum tensile stress in MPa.
  8. 9. Term used for distance between line of action of load and centroidal axis.
  9. 10. A shaft under 300 N·m bending and 400 N·m torque is checked by maximum shear stress theory. Compute equivalent shear stress in MPa.
  10. 13. A shaft of diameter 50 mm transmits 30 kW at 150 rpm. Find torque in N·m.
  11. 16. Stress below which material can withstand infinite cycles without failure.