Which statements about the tensile stress-strain behaviour of engineering materials are correct?

Select all that apply

• Option A

  The slope of the initial linear portion of the stress-strain curve gives Young's modulus.

• Option B

  The area under the complete stress-strain curve up to fracture is related to toughness per unit volume.

• Option C

  A ductile material generally undergoes appreciable plastic deformation before fracture.

• Option D

  For the same material and test conditions, breaking stress is a material-strength quantity whereas breaking force also depends on specimen area.