Machine Design Crossword

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  1. 4. The maximum stress a material can withstand without permanent deformation
  2. 6. A steel rod has a yield strength of 450 MPa. If it is subjected to a working stress of 150 MPa, this is the resul ng factor of safety. Write the numerical answer as a word.
  3. 8. Factor used to account for uncertainties in design
  4. 9. A steel bar of 20 mm diameter is subjected to tensile load of 31.4 kN. The induced stress in MPa (in words) is –
  5. 11. Stress concentration is highest at sharp
  6. 12. A key that prevents relative rotation but allows axial movement
  7. 13. Common shaft design formula involves torque and
  8. 14. A rigid coupling is used to transmit 50 kW power at 300 rpm. There are six bolts. The outer diameter of the flanges is 200 mm, while the recess diameter is 150 mm. The coefficient of friction between the flanges is 0.15. The bolts are made of steel 45C8 (Syt= 380 N/mm') and the factor of safety is 3. Determine the diameter of the bolts. Assume that the bolts are fitted in large clearance holes.
  9. 15. Sudden break without much plastic deformation
  10. 17. Theory of failure used for ductile materials
  11. 20. Coupling designed to absorb shock loads
Down
  1. 1. Shaft design is based on strength and
  2. 2. A rod of a linkage mechanism made of steel 40Crl (Sut = 530 N/mm2) is subjected to acompletely reversed axial load of 100 kW. The rod Is machined on a lathe and the expected reliability Is 95%. There is no stress concentration. Determine the diameter of the rod using a factor of safety of 2 for an infinite life condition
  3. 3. A tapered key that provides tight fit
  4. 5. A solid sha transmits 10 kW of power at 200 rpm. If the permissible shear stress is 42 MPa, this is the required sha diameter in mm, rounded to the nearest integer. Write the answer in words.
  5. 7. Limit beyond which fatigue failure does not occur
  6. 10. The standard cross-section for a flat key, which is fitted on a 50 mm diameter shaft, is 16 x 10 mm. The key is transmitting 475N-m torque from the shaft to the hub. The key is made of commercial steel (Syt = Syc = 230 N/mm). Determine the length of the key, if the factor of safety is 3
  7. 16. Graph used to show endurance limit in fatigue
  8. 18. A steel rod has an endurance limit of 280 MPa. If a factor of safety of 2 is applied for design, this would be the permissible design stress in MPa. Write the numerical answer in words.
  9. 19. Stress = Force divided by area