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WorksheetsENG1008 Materials Tutorial Week 9
Total questions: 9
Worksheet time: 7mins
Upon the yielding in a tensile test, (choose all correct statements below)
plastic deformation starts
elastic deformation ceases
material becomes weaker
material fractures
What are the four main stages of deformation in a ductile material after the elastic deformation? Please put them in the correct order of occurance as _____, _____, _____, _____ (separately by a comma and a space)
(a)
The stress-strain curves below represent: red for ____ stress/strain; blue for _____ stress/strain.
true, true
engineering, true
true, engineering
engineering, engineering
In general, metals and alloys have relatively higher ____ than ceramics and polymers.
yielding strength
tensile (ultimate) strength
ductility
toughness
Resilience is the ability of a material to store strain energy during (a) deformation?
The toughness of a material can be determined by
integrating the stress function over the full strain range
the total area under stress-strain curve
all energy of mechanical deformation per unit volume prior to fracture
none of above
Modulus of Resilience can be calculated by the area under stress-strain curve up to
necking
ultimate strength
yielding
fracture
What is the ductility of the same material on the left and right sides of the transition temperature line?
ductile, brittle
brittle, ductile
ductile, ductile
brittle, brittle
An alloy has a yield strength of 805 MPa and an elastic modulus of 107 GPa. Calculate the modulus of resilience for this alloy (in J/m3, which is equivalent to Pa) given that it exhibits linear elastic stress-strain behavior.
6.6×106
3.3×106
2.2×106
1.1×106
