Calculating Vickers Hardness Number
TECTechnics Classroom   TECTechnics Overview

Expressions Of Pj Problems
Calculating Vickers Hardness Number

Vickers Hardness Test

(a) What is technological hardness?
(b) What is Vickers hardness?
(c) A Vickers hardness test made on a steel specimen with a load of 30 kg produces an impression whose diagonal measure is 0.654 mm. Calulate the Vickers hardness number and determine the load that should be used if the hardness of an area 0.050 mm in diameter, in the same piece of steel, is to be measured.

Vickers Hardness Test

The strings: S7P3A32 (force - push).

The math:
Pj Problem of Interest is of type force (push).

(a) In general hardness, is the strength of the surface of a material. In many instances, the surface strength of a material is significantly different from that of the bulk (e.g. surface-hardened steel).Technological hardness is the resistance of a material to permanent deformation of its surface. The deformation may be a scratching impression, mechanical wear, indentation, or cutting.

(b) Indenters of various geometric shapes are used to test the hardness of the surface of a material. Some of the commonly used shapes are: sphere, cone and pyramid. Vickers hardness is the hardness measured by a square-based pyramid indenter.

(c) As an indenter penetrates the surface of a material, the area over which the force of the indenter acts, increases with the depth of penetration, Consequently, the hardness can be expressed only in terms of force and area. As figure 1.1 shows, the Vickers hardness is expressed in terms of force and area as follows:
Vickers hardness, Hv = P/A = P/d2(2 sin α/2). Where A = d2/(2 sin α/2) and α is the angle between two opposite faces of the pyramid; P is expressed in kilograms and A is expressed in millimeter.

Hv = (1.8544)(30/(0.654)2) = 130.
Load P, to be used for area A = 0.050 mm with same hardness, P = [130(0.050)2]/1.8544 = 0.175225 kg = 175 g.


The point . is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.
Derivation Of The Area Of A Circle, A Sector Of A Circle And A Circular Ring
Derivation Of The Area Of A Trapezoid, A Rectangle And A Triangle
Derivation Of The Area Of An Ellipse
Derivation Of Volume Of A Cylinder
Derivation Of Volume Of A Sphere
Derivation Of Volume Of A Cone
Derivation Of Volume Of A Torus
Derivation Of Volume Of A Paraboloid
Volume Obtained By Revolving The Curve y = x2 About The X Axis
Single Variable Functions
Absolute Value Functions
Real Numbers
Vector Spaces
Equation Of The Ascent Path Of An Airplane
Calculating Capacity Of A Video Adapter Board Memory
Probability Density Functions
Boolean Algebra - Logic Functions
Ordinary Differential Equations (ODEs)
Infinite Sequences And Series
Introduction To Group Theory
Advanced Calculus - Partial Derivatives
Advanced Calculus - General Charateristics Of Partial Differential Equations
Advanced Calculus - Jacobians
Advanced Calculus - Solving PDEs By The Method Of Separation Of Variables
Advanced Calculus - Fourier Series
Advanced Calculus - Multiple Integrals
Production Schedule That Maximizes Profit Given Constraint Equation
Separation Of Variables As Solution Method For Homogeneous Heat Flow Equation
Newton And Fourier Cooling Laws Applied To Heat Flow Boundary Conditions
Fourier Series
Derivation Of Heat Equation For A One-Dimensional Heat Flow

The Universe is composed of matter and radiant energy. Matter is any kind of mass-energy that moves with velocities less than the velocity of light. Radiant energy is any kind of mass-energy that moves with the velocity of light.
Periodic Table
Composition And Structure Of Matter
How Matter Gets Composed
How Matter Gets Composed (2)
Molecular Structure Of Matter
Molecular Shapes: Bond Length, Bond Angle
Molecular Shapes: Valence Shell Electron Pair Repulsion
Molecular Shapes: Orbital Hybridization
Molecular Shapes: Sigma Bonds Pi Bonds
Molecular Shapes: Non ABn Molecules
Molecular Orbital Theory
More Pj Problem Strings

What is Time?
St Augustine On Time
Bergson On Time
Heidegger On Time
Kant On Time
Sagay On Time
What is Space?
Newton On Space
Space Governance
Imperfect Leaders
Essence Of Mathematics
Toolness Of Mathematics
The Number Line
The Windflower Saga
Who Am I?
Primordial Equilibrium
Primordial Care
Force Of Being

Blessed are they that have not seen, and yet have believed. John 20:29

TECTechnic Logo, Kimberlee J. Benart | © 2000-2021 | All rights reserved | Founder and Site Programmer, Peter O. Sagay.