Elastic and Plastic Deformation

Stress versus strain graph consists of ____ regions

• 2

• 3

• 4

• 1

Elastic deformation fulfill these properties which are

• Material cannot regain its original length/shape after force is removed

• Obey Hooke's Law

• The elongation of wire is proportional to the force applied

• After force is removed, the material will regain its original length/shape

Plastic deformation would have properties which are

• Material cannot regain its original length/shape when the force is removed

• It obey Hooke's Law

• The elongation of wire is still in proportion with the force applied

• It has a permanent elongation

Upper yield point marked the starting point of plastic deformation to occur. Is this statement TRUE or FALSE

(a)  

Ductile material can exhibit both elastic and plastic deformation while brittle materials shows only elastic behavior. Briefly explain the situation

In a situation, same amount of force is applied upon material A and material B of same dimension. Material A fracture after certain amount of maximum force is exerted, while material B breaks before yield point is achieved. We can conclude that material A and B classifies respectively as

• ductile and brittle

• amorphous and brittle

• brittle and ductile

• crystal and ductile

Why does materials with plastic deformation cannot regain its size/shape when it has reached plastic deformation? Give your brief opinion/explanation

• both elastic and plastic

• elastic but not plastic

• plastic but not elastic

• not elastic and not plastic