Mechanical Properties of Materials Quiz

When a carbon steel 'yields', this is due to the material:

• Strain hardening

• Necking

• Entering elastic deformation

• Fracturing

What is torsional stress?

• An applied load that acts to reduce the length of the material.

• Twisting action caused by a pair of externally applied equal and oppositely directed force.

• An applied load that tends to elongate the material along the axis of the applied load.

• When an applied load causing a bending motion within a material

What is Youngs' Modulus

• Is a mechanical property that measures the tensile or compressive stiffness of a solid material when the force is applied.

• The limited deviation of the linear relationship between stress and strain reaches a specified value.

• The displacement or size of the deformation is directly proportional to the deforming force or load.

• The area under a stress/strain graph

Calculate the tensile stress in a steel rod with a rectangular section of 10m x 4m when it is subjected to a load of 100N.

• 0.4 N/m²

• 3.18 N/m²

• 2.5 N/m²

• 25 N/m2

Cast iron contains:

• 2.1% to 4% carbon

• less than 0.08% carbon

• 3.8% to 4.7% carbon.

• More than 5% carbon

When nickel is added to steel, it:

• Will increase its' strength

• Refines the grain structure

• Decreases the heat treatment temperature

• Reduces the strength

Manganese at 12% will:

• Become very hard when rubbed together

• Has a very low coefficient of expansion

• Has almost all its carbon removed

• Causes the material to become more ductile

What type of test involves using a weighted pendulum to strike a material until fracture:

• Impact Resistance Test

• Fatigue Testing

• Hardness Test

• Tensile Test

Toughness is:

• The ability of a metal to resist a suddenly applied load.

• The ability to withstand side cutting loads.

• The property of being able to be permanently extended by a tensile force.

• Is the property that allows a material to be stretched without breaking.

Plasticity is:

• The ability of a material to withstand a crushing load.

• The ability to withstand side cutting loads.

• The ability to retain a deformation after the load producing it has been removed.

• The ability to return to normal after a load has been removed.