An aerospace engineer has built two differently designed wings. One wing is made from
an aluminium alloy and the other is made from a carbon fibre composite.
The engineer tests a sample of each material by applying a varying stress.
Tick two of the boxes to indicate which are properties of the material
from which the wing is made.
breaking stress
stiffness constant, k
tensile strain
tensile stress
Young modulus
The answer is breaking stress and Young modulus. Why is stiffness constant not a property? and also intuitively I know that stress and strain would change if the shape of the object changes but could someone explain why with actual physics.