Machine Design Crossword

1234567891011121314151617181920
Across
  1. 3. A rectangular plate is subjected to a tensile load of 90kN. If its width is 30mm and thickness is 10mm, the stress in the rectangular plate is __x10^2 MPa.
  2. 6. Angle of twist is limited in design to control__ rigidity.
  3. 8. This principle allows combining axial stress and bending stress into a resultant stress for eccentric loads
  4. 12. This dimensionless ratio, central to failure theories, compares actual stress to allowable stress for safe design.
  5. 15. Stress pattern that varies from zero to maximum value, where mean stress equals half the maximum stress σₘ = σₘₐₓ/2.
  6. 17. The gradual failure of a component due to repeated stress cycles is called ______ failure.
  7. 18. ___ Equation that sums damage fractions under variable amplitude loading.
  8. 19. In a fully reversed fatigue test, the stress is like a pendulum swinging symmetrically. Where does the pendulum stop if you average its extremes?
  9. 20. A component is designed to carry a load of 40kN. If the material’s yield strength is 200N/mm2 and the actual stress developed is 50MPa, calculate the Factor of Safety. (In Words)
Down
  1. 1. Shear Stress limit 40 MPa, torque 1500 N·m. What solid diameter balances the torsion equation (mm) (First digit of the answer)?
  2. 2. In Goodman’s rule, if σm=0, the allowable alternating stress is equal to the corrected endurance limit. For Se=200 MPa, then the stress is ___x10^2 MPa.
  3. 4. Among solid and hollow shafts of the same weight and material, which shaft transmits more torque for the same shear stress?
  4. 5. It is neither yield strength nor ultimate strength, yet it decides whether your machine can run “forever” under cyclic stress. What is this boundary limit called ?
  5. 7. This conservative fatigue theory connects endurance limit with yield strength, but ironically produces the most restrictive design.
  6. 9. If a shaft diameter is doubled, torque-carrying capacity increases by this factor, if shear stress kept constant. (In words)
  7. 10. For a notched component with Kₜ = 2.8 and q = 0.65, determine the fatigue stress concentration factor. (In Words) (Roundoff to nearest Integer)
  8. 11. When a force is applied off-centre to a structural element, resulting in a combination of axial and bending stresses rather than just direct stress, it called as _____ loading.
  9. 13. ___ key is the key in which half the thickness fits into the keyway on the shaft and the remaining half fits into the keyway on the hub.
  10. 14. A hollow shaft (outer dia = 100 mm, inner dia = 60 mm) and a solid shaft of equal weight are made of the same material and length also having same area. If both transmit the same torque, by what percentage is the shear stress in the hollow shaft less than that in the solid shaft?(In words)
  11. 16. Find out the 6th number of the R5 basic series from 1 to 10 . (Roundoff to nearest integer)(In Words)