1 Mechanical Properties

What does the tensile test primarily measure in materials?

• The impact resistance of a material

• The elongation and reduction in diameter of a material under tension

• The change in temperature with strain

• The ability of a material to resist scratches

Which of the following defines engineering stress?

• Stress divided by instantaneous area

• Applied force divided by original area of the test specimen

• Elongation divided by original gauge length

• The frictional force per unit area during shear stress

What is the term for the material's behavior when it begins to deform plastically?

• Tensile strength

• Yield point

• Hardness limit

• Recrystallization temperature

Which statement about shear viscosity is true for Newtonian fluids?

• Shear viscosity increases with shear rate

• Shear viscosity is constant

• Shear viscosity fluctuates randomly

• Shear viscosity is zero

What happens to most metals when heated to their recrystallization temperature during manufacturing?

• They become brittle and fracture easily

• They strain harden at a rapid rate

• They form new, strain-free grains and behave as perfectly plastic materials

• Their modulus of elasticity increases significantly