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Essay On Hardness Testing

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Aims The aims are to complete and observe a set of destructive mechanical testing on certain types of materials all with different properties, where there are three different types of destructive mechanical testing to be completed. Such as: Tensile testing, to observe the material’s ability to deform with application of tensile stress to a specimen. Where stress and strain will be gauged and displayed as a graph on a connected monitor. Hardness testing, to observe how much force is required for the material’s surface to have an indentation. The results will be displayed on the hardness dial. The information is already known that the hardness of the material is the ability to withstand surface scratching or indentation. Impact testing, to observe how much …show more content…

The materials being tested within the three experiments are aluminium, steel, brass and nylon. Introduction In the hardness testing the goal is to observe and record the hardness of each individual material tested within the experiment using a hardness testing machine which includes an indicator and a lever which controls the movement of the indenter onto the material’s surface, the material is placed in the vice connected to the elevating screw. The machine also contains a pressure gauge and hardness dial which displays the result in joules per millimetre squared (J/mm2). The type of hardness testing used was the Rockwell A. Hardness is an important property in a material as it allows for predictions on how it can withstand to pressure applied to its surface without deforming. In the tensile test, the goal is to observe and record the tensile strength of each individual material. The equipment used was a tensile testing machine which includes an upper and lower grip. The grips are used to hold the specimen in position. The machine includes an extensometer which measures the change in length of the

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