554 Words3 Pages

Mechanical testing on a piece of epoxy
Results:
Graph 1, Shows the relationship between the load applied to the epoxy sample and the extension.
Graph 1, Shows the relationship between the load applied to the epoxy sample and the extension.
A load-extension graph was plotted:
Graph 1 shows, how the sample of epoxy extend while the applying force increases. From the graph above, an average value of load over extension is given by the slop. Therefore, calculating the stiffness of the epoxy sample can be found by using the equation bellow (Johnson, et al., 2000). Since the gradient is defined by using a straight line graph, the stiffness was calculated by using two points that lay on the straight line part of the graph. k=change in loadchange in extension
Therefore:
k=448.470.73=614.3 N mm-1
Discussion:
One of the most important properties of a material that an engineer should conceder while deciding which material is suitable for a particular job, is stiffness. It is defined as how hard it is to bend a material. However, from the value of stiffness the mechanical behavior of a sample can be known. In this experiment, the stiffness of the epoxy sample was 614.3N mm-1. Therefore; epoxy is a strong material that needs a large amount of force in order to produce a small amount of extension. Resisting the elastic deformation can also be a result of a high value of Young’s modulus (Duncan, 1993). Normally the sample is shaped as dumbbells in this type of experiments so, that it would be easier to place the sample in the holder of the testing machine and it is easier to notice the deformation of the sample at a certain load. This test was based on the American society for testing and materials standards. Those standards were made to develop the quantity of the product in addition to insure that any experiment was preformed correctly and how accurate are the

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