Modle 2 : Hardness tests Flashcards
Name four types of hardness tests?
Brinell, Vickers, Rockwell and Shore scleroscope
What is the Brinell hardness test?
A hardened steel ball is forced into an object under specified load conditions.
The hardness number is determined by measuring the depth and surface area of the impression and by using a formula, which also incorporates the load.
What is the Vickers hardness test?
A small pyramid is forced into a test piece under specified load conditions.
The hardness number is derived from a formula that contains the load and area of the indentation.
More useful for thin metals as the loads are lower and the indentor is smaller.
What is the Rockwell hardness test?
A diamond cone (or sphere) is forced into a test piece under specified load conditions and a reading is displayed on the dial.
There are different scales for different loads depending on the material used.
There is no formula as it is a number from 100-500.
What is the Shore Scleroscope hardness test?
This test involves a small striker in a tube.
The tube is placed over an item and the striker is dropped, the height the striker rebounds from the item is the measure of the hardness.
