Determine hardness of material, Mechanical Engineering

Determine hardness of material:

Hardness is surface property. It can be defined as resistance of material against permanent deformation of surface in the form of scratch, indentation, cutting, or mechanical wear. The requirement of hardness test arises from the fact that in numerous engineering applications, 2 components in contact are made to slide over each other. Eventually, their surfaces are scratched and they may fail because of mechanical wear. This result in not only quick replacement of both parts but also incurs big loss in the terms of money.

For instance, piston ring of an I.C engine remains in sliding contact with cylinder body when piston reciprocates within the cylinder. If proper care is not taken in the selection of materials for then, the piston rings and cylinder will wear soon.

In this case replacement or repairing of cylinder block will require much time, trouble and money. Thus, the material of piston rings and cylinder block should be taken such that wear is least on cylinder. Thus in case of repairing, cheaper piston rings can be easily replaced. This envisages that the material of cylinder block should be harder than material of piston rings so that cylinder wears the least. This can be ascertained by the conduct of hardness test. This is why it is essential to know how this test can be conducted.

Posted Date: 10/20/2012 4:05:11 AM | Location : United States







Related Discussions:- Determine hardness of material, Assignment Help, Ask Question on Determine hardness of material, Get Answer, Expert's Help, Determine hardness of material Discussions

Write discussion on Determine hardness of material
Your posts are moderated
Related Questions
limitations of first law of thermodynamics: There are some limitations of First Law of Thermodynamics. 1. When a closed system undergoes thermodynamic cycle, the average he

State the four classes of engineering materials 3 (b) Identify the class which each of the following materials belong to. Present your answer in table form Silicone, concrete, chro

what is the advantage of fan

A jet strikes tangentially a smooth curved vane moving in the similar direction as the jet, and the jet gets reversed in the direction. Prove that the maximum efficiency is slightl

(a) Explain briefly the functions of the spiral casing guide vanes, and draft tube of a reaction water. (b) A Kaplan turbine developing 3250 KW under a head of 6m has a draft tu

A steel dia 10 mm passes through a brass tube of internal dia 15mm and external dia is 25 mm. The bolt is tightened by a nut. The length of tube is reduced by 1.5mm and the length

Draw the shear force and bending moment diagrams for the beams shown in Figures 4 and 5. Also find the maximum shear force, bending moment and the points of contra-flexure

Deflection at the centre - maximum deflection: A simply supported beam of span 6 m is subjected to Udl of 24 kN/m for a length of 2 m from left support. Discover the deflectio

Stress-Strai n Curves (Compression): For the ductile materials stress strain curves in compression are similar to those in tension at least up to the yield point for all the

Cracks   Cracks are the linear ruptures of the metal under stress. Sometimes they appear large and frequently they are narrow separations. The major classification of cracks