Materials - multiple choice 2 Flashcards
Proof stress is used when non - ferrous metals are undergoing tensile tests to determine the equivalent?
a) Tensile
b) Elasticity
c) Yield Strength
d) Tensile Strength
c) Yield Strength
In a tensile test a brittle fracture would be indicated if the fracture surface?
a) Shows a reduction in size
b) Is flat and featureless
c) Breaks in the parent material
d) Breaks at 45° to the load
b) Is flat and featureless
Toe blending is important as it may affect:
a) Corrosion
b) Fatigue life
c) Overlap type defects
d) All the above
b) Fatigue life
In a fatigue failure the appearance of the fracture surface is characteristic. It would be?
a) Round and torn
b) “Chevron” – like
c) Smooth
d) None of the above
c) Smooth
The likelihood of brittle fracture in steels will increase with?
a) A large grain formation
b) A reduction of in – service temperature to sub zero temperature
c) Ferritic rather austenitic steels
d) All the above
a) A large grain formation
b) A reduction of in – service temperature to sub zero temperature
c) Ferritic rather austenitic steels
d) All the above
A tensile test will assess?
a) Impact Values
b) Stress
c) Strain
d) Both b and c
b) Stresss
c) Strain
d) Both b and c
The most common type of failure associated with sharp fillets, notches and undercut is?
a) Crystallization
b) Fatigue
c) Corrosion
d) Brittle fracture
b) Fatigue
Percentage elongation of a metal undergoing a tensile test is a measure of?
a) Elasticity
b) Plasticity
c) Ductility
d) Malleability
c) Ductility
When a longitudinal load is put on a lap joint, the stress set up is normally?
a) Shear stress
b) Tensile stress
c) Compressive stress
d) Residual stress
a) Shear stress
When a metal is subjected to a fluctuating load, a condition of cyclic stressing can be set up, which eventually can result in structural breakdown as?
a) Tensile failure
b) Fatigue failure
c) Yield failure
d) Shear failure
b) Fatigue failure
The crack tip opening displacement (CTOP) method has proved useful?
a) Only when the material behaves elastically
b) Only when the steels is stronger that 500Mpa yield strength
c) When there is a significant crack tip yielding before fracture
c) When there is a significant crack tip yielding before fracture
CTOD testing is usually carried out?
a) In an impact machine
b) In low tension
c) In slow bending
c) In slow bending
CTOD test measures?
a) The energy to cause failure
b) The opening displacement at the crack tip during final fracture
c) The opening displacement of the crack during final fracture
b) The opening displacement at the crack tip during final fracture
Three stages in creep are?
a) Elastic, plastic, strain
b) Stress, elongation, tensile
c) Primary, secondary, thirdly
d) Primary, secondary, tertiary
d) Primary, secondary, tertiary
Splices in simply supported beams should be place?
a) In the centre of the beam
b) As close to the ends of the members as possible
c) As far away as possible from the ends of members
b) As close to the ends of the members as possible
