Hardness Test

            
             Course: ME 212 Laboratory.
            
            
            
            
            
            
            
            
            
            
            
            
            
             Figure 1 Side-view of Rockwell tester .
             Figure 2 Front-view of Rockwell tester ." .2.
             Figure 3 Schematic description of the UCI probe ." .3 .
             Figure 4 Cross-cut of a typical impact device ." .".3.
             Figure 5 Brale ." .".4 .
             Figure 6 Anvils .".4.
             LIST OF TABLES.
             Table 1 Selected Rockwell hardness scales for experimental procedure ." .2.
             Table 2 Data obtained through experimental procedure .2.
             i .
             LIST OF SYMBOLS.
             SYMBOL DEFINITION.
             A0 Initial area over which force (F) acts (m2).
             F Force (N).
             o Stress (N/m2) .
             ∆l Change in dimension (m) .
             l0 Initial dimension (m) .
             å Strain .
             oUTS Ultimate strength (Mpa).
             E Elastic modulus (GPa).
             RHC Rockwell hardness number on the C scale.
             RHD Rockwell hardness number on the D scale .
             BHN Brinell hardness number.
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             ii.
             ABSTRACT.
             Mechanical properties are of interest to engineers utilizing materials in any application where forces are applied, dimensions are critical, or failure is undesirable. Hardness is a fundamental mechanical property which has a critical importance for engineers. .
             Because there are several methods of measuring hardness, the hardness of a material is always specified in terms of the particular test that was used to measure this property.