To Determine the Mechanial Properties of Materials

Nayang Polytechnic

11

Lab Report

To Determine the Mechanial Properties Of Materials

Heng Xun g (116835R), David Ang (*******), Deslen Yeo (*******), Ong Zheng Han (*******), Wu Jia Ming (*******),

Module Group No: EGC 105 – C4

Team 1

25th October 2011

Introduction...

Using of Brinell and Vickers hardness tester to determind the different hardness of common engineering materials.

In this lab report, we had use 2 materials. They are commerial pure copper and mild steel.So, by using these 2 machines, we will be able to know the hardness of the materials. In addition, knowing how to operate these machines for a accurate data.

Procedures...

Brinell Hardness Test

Brinell Test Method

All Brinell tests use a carbide ball indenter. The test procedure is as follows:

* The indenter is pressed into the sample by an accurately controlled test force.

* The force is maintained for a specific dwell time, normally 10 - 15 seconds.

* After the dwell time is complete, the indenter is removed leaving a round indent in the sample.

* The size of the indent is determined optically by measuring two diagonals of the round indent using either a portable microscope or one that is integrated with the load application device.

* The Brinell hardness number is a function of the test force divided by the curved surface area of the indent. The indentation is considered to be spherical with a radius equal to half the diameter of the ball. The average of the two diagonals is used in the following formula to calculate the Brinell hardness.

*

Indenter : Tungstun Carbide Ball (Diameter = 2.5 mm)

Material Type | F/D2 (kg/mm2) | F |

Commerical Pure Copper | 10 | 62.5 Kg (Given) |

Steel | 30 | 187.5 Kg |

Firstly, We will set load of 62.5 Kg on the Brinell Hardness Tester as it is the recommended load setting given for copper. Then, we will observe the profile of the indentation and record its diameter(d) by turing the knod to the side of the...