Hardness of a material refers to the resitance the material offers to permanent plastic deformation when an external force is applied. Wikipedia defines it as the measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied.
In view of syllabus of material science, Impact hardness tests are important and necessary. Impact hardness refers to resitance offered by material when the force applied is impact in nature i.e. for short period with high magnitude.
The four important tests covered in the syllabus are
- Rockwell Hardness test
- Knoop Hardness test
- Vickets hardness test
- Brinell's Hardness test
The hardness tests are performed since
- They are easy, simple
- The set up is in-expensive
- The test doesn't damage the entire specimen. Usually small specimen is sufficient
- Other physical properties can be told from this tests
with warm regards
Abhishek Boinapalli
No comments:
Post a Comment