Find Proportional limit Upper yield point Lower yield point

Find: Proportional limit Upper yield point Lower yield point Ultimate Tensile Strength fracture stress % elongation Please DO NOT answer if you are not sure

Solution

1. Proportional Limit: The point where the linear behaviour is disturbed. It is around 5th point starting from the bottom. Hence, Proportional Limit=13029.316psi

2. Upper Yield Point: The point where there is sudden increase in strain for a little increase in stress. It is represented by the 8th point or (S.No 9 as per the excel sheet). Thus Upper Yield Point=22801.329psi

3. Lower Yield Point: It is the lower limitof the stress for which strain increases abruptly. As for this experiment, load is always increased, Hence we can\'t determine the lower yield point.

4. Ultimate Tensile Strength: It is the maximum load or stress that the specimen can sustain before failure. It is the top most point in the graph. Hence Ultimate Tensile Strength is 32573.2899psi