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#material behavior

2 public questions tagged with this topic.

Elastic Properties and Applications

What characterizes the stress-strain behavior of a material in the region where plastic deformation begins?

When plastic deformation begins, the material experiences permanent deformation, meaning it does not return to its original shape even after the load is removed. As per NCERT, applying relevant law/formula with correct units and sign convention leads to The material experiences permanent deformation. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.

Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.

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Stress, Strain and Hooke's Law

In the stress-strain behavior of a material, what occurs after the maximum stress point when the material is ductile?

For a ductile material, after the maximum stress point (ultimate tensile strength), the stress decreases with increasing strain as the material necks, leading to fracture. As per NCERT, applying relevant law/formula with correct units and sign convention leads to The stress decreases leading to fracture. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.

Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.

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