Strain Energy Resilience and Toughness
Strain Energy (SE)
It is defined as the energy absorbed by a member when work done by the load deforms that member.
It is defined as the energy absorbed by a member within the elastic region.
Proof Resilience (PR)
It is defined as the maximum energy absorbed by a member up to the elastic limit.
PR=1/2 P_elastic ∆_elastic
Proof resilience is the area under the load vs deflection curve up to elastic limit
It is not a property
When proof resilience increases
- There is a selection of material with higher elastic limit
- There is a selection of material with lower young’s modulus
- It provides more volume
Modulus of resilience (MR)
- MR is a property.
It is defined as the energy absorbed by a material up to fracture.
Toughness is the total area under the load deflection curve.
Modulus of toughness
Toughness per unit volume is called modulus of toughness.
- Modulus of toughness and modulus of resilience is two important property of a material when it is subjected to impact loading.
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