unit 3-Strain Energy and Modulus of Resilience

What is strain energy?

• Energy stored in a body due to deformation

• Energy released during fracture

• Kinetic energy of a moving body

• Heat energy generated during loading

Strain energy is typically stored in a material when it is subjected to:

• Compression only

• Tension only

• Any elastic deformation

• Plastic deformation

The unit of strain energy is:

• Newton (N)

• Joule (J)

• Pascal (Pa)

• Watt (W)

Strain energy is a measure of:

• Work done by external forces

• Energy dissipated as heat

• Energy stored due to elastic deformation

• Permanent deformation energy

Proof resilience is defined as:

• The maximum strain energy stored at failure

• The maximum strain energy stored at the elastic limit

• The total energy stored in a material

• The energy required to break a material

Modulus of resilience is the proof resilience per unit:

• Length

• Area

• Volume

• Mass

The modulus of resilience is expressed in the unit:

• J/m²

• J/m³

• N/m

• N/m²

Which material property is directly related to the modulus of resilience?

• Yield strength

• Ultimate tensile strength

• Hardness

• Ductility

The strain energy stored in a bar under axial load is given by:

• U = (P²L)/(2AE)

• U = (PL)/(AE)

• U = (P²L)/(AE)

• U = (PL²)/(2AE)

For a bar under axial tension, strain energy depends on:

• Load and material density

• Load, length, area, and Young’s modulus

• Length and temperature

• Area and weight only