1 i)Young’s modulus is the ratio of: A. tensile (or compressive) stress to the l

Question

1 i)Young’s modulus is the ratio of:

A. tensile (or compressive) stress to the longitudinal strain

B. shear stress to the longitudinal strain

C. longitudinal strain to the tensile (or compressive) stress

D. shear strain to the longitudinal stress

1 ii) A brittle material:

A. has a large plastic deformation region

B. fractures at low stress

C. breaks soon after the yield point is reached

D. has a large elastic region

1 iii) A particular alloy has a limit of proportionality of 60 MPa, a yield strength of 130 MPa and ultimate tensile strength of 215 MPa. An axial tensile force of 40 kN is applied to a 25 mm diameter rod of that material. It can be expected that:

A. the rod will break in tension

B. the rod will not return to exactly its original length when the load is removed

C. the rod will return to exactly its original length when the load is removed

D. the rod will fail in shear

Explanation / Answer

i)A. tensile (or compressive) stress to the longitudinal strain

ii)C. breaks soon after the yield point is reached

iii)B. the rod will not return to exactly its original length when the load is removed(since stress here is 81.48(calculate force/area)) which is greater than limit of proportionality.

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