Two specimens made of two different materials are tested in an axial tension test by applying a force of F = 20 kN on each specimen (Figure Q4).
Specimen 1 is an aluminium bar with elastic
modulus E1 = 70 GN/m2 and a rectangular
cross-section (1cm by 2cm). Specimen 2 is a steel
rod with elastic modulus E2 = 200 GN/m2 and a circular cross-section (radius 1 cm).

Calculate the tensile strain for each specimen (assuming the tensile stress in each specimen is below the proportionality limit).

Question

Two specimens made of two different materials are tested in an axial tension test by applying a force of F = 20 kN on each specimen (Figure Q4).
Specimen 1 is an aluminium bar with elastic
modulus E1 = 70 GN/m2 and a rectangular
cross-section (1cm by 2cm). Specimen 2 is a steel
rod with elastic modulus E2 = 200 GN/m2 and a circular cross-section (radius 1 cm).

Calculate the tensile strain for each specimen (assuming the tensile stress in each specimen is below the proportionality limit).