MD - Crossword Labs

4. A 70 mm dia shaft carries torque 10 kN·m. Compute maximum shear stress in MPa.
7. 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?
8. A shaft experiences 2×10⁵ cycles with life 3×10⁵ and 6×10⁵ cycles with life 10⁶. Compute Miner’s cumulative damage fraction.
9. A 2 m long shaft of 40 mm dia transmits 1 kN·m torque. With G = 80 GPa, calculate twist in radians.
10. Failure criterion that considers mean stress and alternating stress using ultimate strength.
11. Special spline type used for smooth torque transmission with reduced stress concentration.
13. Systematic process of minimizing weight while maintaining required strength and safety.
14. 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?
16. Formula relating torque, shear stress, polar moment, shear modulus, and twist angle.
17. A steel rod of diameter 16 mm carries a tensile load of 50 kN. Calculate maximum tensile stress in MPa.
18. Term used for distance between line of action of load and centroidal axis.

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. Common cause of coupling failure in high-speed shafts.
3. Which material property defines the maximum stress that can be applied repeatedly without causing fatigue?
5. 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.
6. 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
12. Conservative fatigue design criterion based on yield stress and endurance limit.
15. A shaft of diameter 50 mm transmits 30 kW at 150 rpm. Find torque in N·m.