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Mechanical Behaviour Testing Materials
Tough Mechanical Behaviour
Quiz 1
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Q.1
What is an expression of true stress?
a) Pu / Ai
b) Pu / A0
c) P / Ai
d) P / A0
Q.2
True strain is ____ than the engineering strain corresponding to a given load.
a) Larger
b) Smaller
c) Equal
d) Either smaller or equal
Q.3
What is a relation between true and engineering strain?
a) ƐT = ln (1 + Ɛ)
b) ƐT = ln (L/L0)
c) ƐT = ln (ΔL/L0)
d) ƐT = ΔL/L0
Q.4
What is the relation between true and engineering stress?
a) σT = ln (L/L0)
b) σT = ln (1 + Ɛ)
c) σT = σ (1 + Ɛ)
d) σT = σ (1 – Ɛ)
Q.5
What term defines plastic instability?
a) dP = constant
b) dP = 0
c) dP < 0
d) dP > 0
Q.6
Plastic instability occurs when the slope of the true stress strain curve ____ the true stress at the point.
a) Exceeds
b) Equals
c) Is less
d) Is less or higher
Q.7
True value of stress experience by material _____ than the conventional one for a given load.
a) Higher
b) Lower
c) Equal
d) Higher or lower
Q.8
What is considered more in mechanical working processes?
a) Yield stress
b) Shear stress
c) True stress
d) Engineering stress
Q.9
True stress strain curve _______
a) Continuously rises
b) After yield point comes down
c) After yield point remains constant
d) Uncertain after yield point
Q.10
The points on the true stress strain curve ______ the conventional stress strain curves up to the onset of necking.
a) Lie on the left of
b) Lie on the right of
c) Superimpose
d) May lie on left or right
Q.11
Materials in general have higher elastic strain oforder.
a) True
b) False
Q.12
True stress value is affected by strain hardening.
a) True
b) False
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