What is the Difference Between Toughness and Rigidity?

As a Customized PP Tube Core Factory, let's talk about the difference between toughness and rigidity.

Toughness refers to the ability of a material to absorb plastic deformation work and fracture work before fracture. It characterizes the material's resistance to crack propagation. It can usually be measured by the area under the engineering stress-strain curve. The larger the area, the higher the toughness and the higher the fracture resistance. Strong, the toughness is high only when the horizontal and vertical coordinates (ie, strength and strain) of the stress-strain curve are relatively large. If the strength is too low, the toughness will not be too high even if the ductility is large. Therefore, toughness is a comprehensive indicator of strength and plasticity.

That is to say, toughness refers to the amount of energy absorbed and the plastic deformation ability before the material is destroyed, and the brittleness is the opposite. Therefore, the deformation is large on the tensile curve, and the fracture work is large, that is, the toughness is good. The impact strength is usually evaluated because the impact strength is generally expressed by the work of fracture.

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Plasticity is a property of a material that undergoes permanent deformation under a given load. For most engineering materials, the stress-strain relationship is linear when the stress is below the proportional limit. In addition, most materials exhibit elastic behavior when their stress is below the yield point, that is, when the load is removed, the strain completely disappears. Plasticity is usually measured by elongation and reduction of area.

Tensile strength: It seems to be related to the bond energy, but for the polymer, most of the tensile damage is not the destruction of the bond, but the slip between the molecular chain and the change of the aggregation state, so the main molecule The inter-force is related to the degree of crystallization.

Rigidity is usually measured by bending strength. Polymers are usually evaluated in terms of strength, hardness, and hardness.

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