Procedure Here is the graphical output from tensile testing of five materials: Perspex, polypropylene, aluminium, brass and mild steel, along with the dimensions of the specimen. No values are given on the x axis, for extension, to simplify these questions. This is because the scales differ – except for aluminium and mild steel where they are identical. The load in Newtons is given on the y axis. Use the graphs to answer the questions below. Questions 1. Find the yield load for each specimen. 2. Find the maximum load for each specimen. 3. Which has the larger Young modulus – aluminium or mild steel? Hints 1. The yield point is the point where the graph stops being linear – i.e. it passes from the elastic region, where load is proportional to extension, into the non-linear plastic region where additional load produces increasingly larger extensions. Mark this and measure off the corresponding load. 2.
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