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WorksheetsMechanical Engineering Concepts Quiz
Total questions: 13
Worksheet time: 17mins
What are the advantages of using the involute curve for the profile of gear teeth?
It allows for conjugate action (constant speed ratio while gears are meshing)
The direction of contact force does not change (reduces vibration)
No change in speed ratio even when the center distance changes
False
What information can you not obtain from a uniaxial tensile test?
MSS=1/2(tensile strength)
Stress concentration factor
Fracture toughness
700
What factors must be considered when modifying the endurance limit measured from rotating polished beam tests?
Surface condition
Temperature
Size
Type of loading
Reliability
Failure theories for brittle materials
Max normal stress
Brittle columb-mohr
Modified mohr
Failure theories for ductile materials
Max shear stress
Distortion energy
Ductile columb-mohr
What information can we obtain from a uniaxial tensile test?
Yield strength
Amount of work hardening
Ultimate tensile strength
Toughness
The main mechanism of plastic deformation in ductile metals is the motion of
(a)
What is the contact ratio for spur gears?
(a)
What is the contact ratio for helical gears?
(a)
If a normal stress of 100MPa is applied to a tensile specimen, the maximum shear stress developed in the specimen is 100MPa.
A steel rotating-beam test specimen has a UTS of 1500MPa. What is the approximated value of the endurance limit from rotating beam tests?
The area under the stress-strain curve from zero strain to the fracture strain represents fracture toughness.
The area under the stress strain curve from zero strain to the fracture strain represents normal toughness.
