Question

With the aid of appropriate sketches, write about fracture and differentiate the two types of fracture based on;

a) Tensile stress-strain curves

b) Specimen dimensional analysis

c) Resulting fracture surfaces

Answer 1

Fracture is of two types

1. Ductile fracture and

2. Brittle fracture.

It is one of the properties of a material.

Fracure is nothing but failure or breakage of material on applying a stress.

In case of Ductile fracture, the material undergoes certain amount of plastic deformation before failure.

In case of brittle fracture there won't be significant amount of deformation before failure.

a) Tensile stress-strain curves are attatched below.

Ductile fracture -- Stres Strain Brittle fracture :- Stress strain CS Scanned with CamScanner

b) Dimensional analysis: For Ductile fracture the dimensions of the sample before and after testing will be different as it undergoes certain amount of plastic deformation.

Whereas for brittle failure, dimensions of the sample before and after testing will be same.

c) Ductile fracture : Fracture surface will be dull and will have dimples because of the plastic deformation.

Brittle fracture: Fracture surface will have faceted appearance and have a flat shiny surface.