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# Toughness and Resilience | Overview and Difference

## Toughness and Resilience are both properties of materials. Material can withstand impact loading without fracture because of toughness and can store energy without having permanent deformation because of resilience

### What is toughness?

Let us understand what toughness means in common usage; When we say someone is tough, it means that they are strong enough to withstand rough conditions. The same applies to materials also.

Toughness is the property due to which the material can withstand impact loading without fracture (At fracture, it breaks!). If the material can take more strain without undergoing fracture then it will be the tougher material.

### What is resilience?

Let us understand what is resilience in common usage; When we say someone is resilient, it means that they will withstand and come back to their original self from difficult conditions. The same applies to materials also.

Resilience is the property due to which a material can store energy without having permanent deformation;

• The energy is released as soon as the load is removed due to which there is no permanent deformation in the body.

• This property is desired in a material for spring action.

### Modulus of Resilience

​Modulus of toughness quantifies this toughness. It is the area under the stress-strain curve upto fracture point. It can also be defined as the strain energy stored per unit volume of the material upto fracture.

• Ductile material can take more strain upto the fracture point than the brittle material

• Mild steel is tougher than Cast iron because of this reason

Modulus of Resilience quantifies this resilience. It is defined as the area under the stress-strain curve upto elastic limit. In other words it is the strain energy per unit volume for a material upto its elastic limit. (We are interested only till elastic limit because that is the energy which can be recovered)

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