Chapter 3 Mechanical Properties of Materials [MOM]

Name four SEQUENTIAL regions characterised from conventional stress-strain diagram of typical ductile materials

• Elastic -> Strain hardening -> Yielding -> Necking

• Elastic -> Yielding -> Strain hardening -> Necking

• Elastic -> Yielding -> Necking -> Strain hardening

And which region is mainly of interest?

• Plastic

• Strain hardening

• Yielding

• Elastic

What are typical differences between ductile and brittle materials shown in their normal stress-strain diagram?

[Choose ALL which applicable]

• Amount of strain before fracture

• Exhibiting yielding

• Tension vs compression behaviour

• Hooke's law

Click ALL correct items about Hooke's law:

[Choose ALL which applicable]

• 0.2% offset method is sometimes required

Which one of the followings is INCORRECT about strain energy density?

• Energy stored per unit volume due to deformation

• Modulus of resilience is measured up to proportional limit

• Modulus of toughness is measured up to fracture point

• Modulus of resilience of ductile materials considers area under the whole diagram

What is the correct expression of Poisson's ratio?

The following statements are CORRECT about shear stress-strain diagram

[Choose ALL which applicable]

• Comparable to normal stress-strain relations

• Similar to normal stress-strain diagram

• Related to torsional tests

• Similar material properties as in normal stress-strain diagram

Tension and compression tests involve:

[Choose ALL which applicable]

• Twisting specimens

• Pulling or pushing specimens

• Finding relation between the material's normal STRESS and STRAIN

• Finding relation between the material's sustained LOAD and corresponding DEFORMATION

• Machine is set to pull or push at a FAST rate until failure

• F