In materials science and metallurgy, toughness is the ability of a material to absorb energy and plastically deform without fracturing. One definition of material toughness is the amount of energy per unit volume that a material can absorb before rupturing.

Answer:

When parts are subjected to shock and impact loads, it is important for them to possess certain properties that can withstand these forces without failure. One such desirable property is toughness.

Toughness:
Toughness is the ability of a material to absorb energy and deform plastically without fracturing. It is a combination of strength and ductility. When a material is tough, it can withstand sudden and intense impact loads without breaking or cracking. This property is particularly important in parts that are subjected to shock and impact loads because it ensures their durability and reliability.

Strength:
Strength is the ability of a material to withstand an applied load without failure. While strength is important in parts subjected to shock and impact loads, it alone may not be sufficient to prevent failure. A material can be strong but brittle, meaning it will fail suddenly and catastrophically when subjected to impact loads. Therefore, strength alone is not the most desirable property in such cases.

Stiffness:
Stiffness refers to the resistance of a material to deformation under an applied load. While stiffness is important in certain applications, it is not the most desirable property in parts subjected to shock and impact loads. If a material is too stiff, it may not be able to absorb and dissipate the energy generated by the impact load, leading to failure.

Brittleness:
Brittleness is the property of a material to fracture or break without significant deformation when subjected to stress. Brittle materials do not possess the ability to absorb energy and deform plastically, making them unsuitable for parts subjected to shock and impact loads. Brittle materials are prone to sudden failure and do not exhibit the desired toughness required for such applications.

In conclusion, toughness is the most desirable property in parts subjected to shock and impact loads. It allows the material to absorb and dissipate the energy generated by the impact load, preventing sudden failure and ensuring the durability and reliability of the parts.

Sudden load bearing strength