Materials Science and Manufacturing Engineering Miscellaneous
Direction: A cup is to be drawn to a diameter of 70 mm with 35 mm depth from a 0.5 mm thick sheet metal. The cup is drawn in one operation. Assume σu = 430 MPa.
- The required blank diameter is
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√d² + 4dh
= √70² + (4 × 70 × 35)
D = 121.24 mmCorrect Option: C
√d² + 4dh
= √70² + (4 × 70 × 35)
D = 121.24 mm
- A cylindrical cup of 48.5 mm diameter and 52 mm height has a corner radius of 1.5 mm. Cold rolled steel sheet of thickness 1.5 mm is used to produce the cup. Assume trim allowance as 2 mm per 25 mm of cup diameter. What is the blank size in mm?
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= √d² + 4dh
D = √(48.5)² + 4 × 48.5 × 52
D = 111.53 mm
Trim Allowance = 2/25 × 48.5 = 3.88 mm.
Total blank size = 111.53 + 3.88 = 115.41 mmCorrect Option: B
= √d² + 4dh
D = √(48.5)² + 4 × 48.5 × 52
D = 111.53 mm
Trim Allowance = 2/25 × 48.5 = 3.88 mm.
Total blank size = 111.53 + 3.88 = 115.41 mm
- At 1000°C the crystallographic structure of iron is _______.
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FCC → due to Austenitic structure.
Correct Option: D
FCC → due to Austenitic structure.
- At the last hammer stroke the excess material from the finishing cavity of a forging die is pushed into _______.
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Gulter is provided in finishing stroke.
Correct Option: A
Gulter is provided in finishing stroke.
- The relationship between true strain (εT) and engineering strain (εE) in a uniaxial tension test is given as
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εtrue = Lf∫Lo dL = In 
1 + ∆L 
L Lo But ∆ = εL ⇒ εtrue = In(1 + εE) Lo Correct Option: C
εtrue = Lf∫Lo dL = In 1 + ∆L L Lo But ∆ = εL ⇒ εtrue = In(1 + εE) Lo
