Compose a 2000 words assignment on the experiment on the determination of tensile strength of metals. Needs to be plagiarism free! The values obtained are plotted on different graphs for each metal. The graphs are of the applied load against the displacement. Finally, the yielding points of the metals are determined from the charts together with the maximum load-carrying capacity of the metals.
In determining the mechanical properties of materials, carefully designed experiments are conducted in the laboratories. The experiments are so designed that they replicate the service conditions in a very close range. Load application on materials involves many factors considered in the real life. The modes, in which loads are applied, include some typical examples like tensile, shear and compressive. These properties are of much importance in material selection for mechanical design. There are other factors like time and temperature that complicate the design process.
As from the topic of this laboratory experiment, the report is confined to the tensile properties of metals. Figure 1 below shows a tensile testing machine with features similar to the one used to conduct this experiment. A specimen of standard dimensions and shape is subjected to an axial load. A doge-bone-shaped specimen is gripped at its two ends and pulled apart during a typical tensile experiment to elongate at a determined rate to its breakpoint. In the process, a highly ductile material may make it difficult to reach its break point. The tensile tester used here for the experiment is manufactured by Instron (model 5569) with a variable pulling rate and a maximum load of 50kN. Different types of mechanical testing can be accommodated by the machine only by changing the setup of the experiment according to the ASTM standards.
A plot of stress (σ) versus strain (ε) is conducted during the tensile test experiment for analytical purposes. The plot can automatically be generated by the software provided by the instrument manufacturer. From the metric system, stress is measured in N/m2 or Pa, whereby 1 N/m2=1Pa. .
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