Material Hardness Experiments

The purpose of the following experiments is to study the hardness of different types of materials, and to understand the significance of this property in materials. The materials and the aforesaid property have significant use in civil engineering. Hardness is defined as a measure oaf material’s resistance to localized plastic deformation (i. E. Small dents or scratches). As said above, a variety of metal alloys were used in the experiments to understand how each of these metals is characterized as a hard metal and to compare the hardness of different metal alloys.

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A study of how the molecular structure and the carbon intent affects the hardness of each metal alloy used is also done during the course of the experiment. Three different tests are used, namely: (i) Vickers Hardness test (ii) Rockwell Hardness test (iii) Brindle Hardness test A further experiment, known as the Chirpy Impact Test is conducted to study the toughness of some specimens of steel.

Toughness is the measure of the ability of a material to absorb energy up to fracture. It has been discovered that the larger the area under a material’s stress-strain curve, the tougher it is.

Therefore a more ductile material is tougher. An impact test is used to ascertain the fracture heartsickness of the material, and it merely offers a relative sense of a material’s toughness. 2. APPARATUS (i) Vickers Hardness Tester is shown in Figure 1. Figure 1 (ii) Rockwell Hardness Tester, as shown in Figure 2.

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Figure 2 (iii) Bristle’s Hardness Tester, as shown in Figure 3. Figure 3 (iv) Mild steel specimen (v) Carbon steel specimen (vi) High carbon steel specimen (vii) SAAB steel specimen 3. TESTS 4. 1 VICKERS HARDNESS TEST 4. 2. 1 Experimental Procedure i.

This basically means that mild steel is more easily deformed than carbon steel, but it does not fracture as easily as carbon steel. This shows us that each of the materials we tested is used for different purposes because of the variety of properties and characteristics they have. It proves to us how important it is to know the mechanical characteristics of different types of materials in order to put them to the best use.