Understanding Young's Modulus

What is a uniaxial test? Select all that apply.

• it stretches a test piece along its length

• it compresses a test piece along its length

• It applies a force in one direction only

When does the tensile test end?

• When the scientists decides to end it

• when the test piece fractures

• After the stress peaks

If the force applied to the material remains in the elastic region, what will happen when the force is removed?

• The test piece will recover its original shape

• the test piece will be permanently deformed

How can Young's Modulus be determined from a stress-strain curve?

• It is the slope of the graph in the elastic region

• It is the slope of the graph in the plastic region

• It is the stress that the material fractures at

Why are plastic deformations not reversed when the load is removed?

• Rather than simply stretching the bonds between atoms, plastic deformation breaks the bonds

• Rather than breaking the bonds between atoms, plastic deformation stretches the bonds

Why is Young's Modulus important to the field of engineering?

• engineers strive to maximize the elastic deformation of structures?

• engineers strive to keep elastic deformations of structures as small as possible