Engineering Tutorials

AIM:- To study the Impact Testing m/c and Perform Izod impact test.

APPARATUS :- Impact testing m/c, Izod test specimens of mild steel, Aluminium, Vernier caliper, specimen setting fixture.

THEORY :- In manufacturing locomotive wheels, coins, connecting rods etc. the components are subjected to impact (shock) loads. These loads are applied suddenly. The stress induced in these components are many times more than the stress produced by gradual loading. Therefore, impact tests are performed to asses shock absorbing capacity of materials subjected to suddenly applied loads. These capabilities are expressed as (i) Rupture energy (ii) Modulus of rupture and (iii) Notch impact strength.

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AIM : To study the Rockwell Hardness testing machine and perform the Rockwell hardness test.

APPARUTS :- Rockwell Hardness testing machine, specimen of mild steel or other material.

THEORY: - Hardness represents the resistance of material surface to abrasion, scratching and cutting, hardness after gives clear indication of strength. In all hardness tests, a define force is mechanically applied on the piece, varies in size and shape for different tests. Common indentors are made of hardened steel or diamond.

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