The excel files and Test Report PDFs you will need to write your report for lab 4 are now up
What we want from you:
A) Stress strain plots for the three samples you ran in class. These are to be created from the Excel file for your section. The Excel files contain three sheets (little tabs at the bottom,) each sheet contains the data for one sample. Note that only the Load (force) and Elongation (deformation) are provided; you will need to calculate engineering stress and strain yourself. A file containing the final gage lengths and diameters of the samples has been included, but the initial gage lengths and diameters were recorded by you in class, and they are not included. Ask a friend for them if you weren''t keeping your lab notebook up to date. Also note that load has been recorded in kilogram-force. Google this unit if you''re not familiar with it. You''ll need to convert it into Newtons to get the correct stress curves. Pick sensible units for your axes: Megapascals is a good choice for stress, simply keeping strain as a decimal works well for strain, but percent is good too. I don''t want to see a trillion micropascals though. Also, this should go without saying, but don''t just stick the stress strain curve that comes with the PDF in your report instead of plotting it, (and don''t put the PDF in at all). Lastly, indicate the yield stress, ultimate stress, and percent elongation (at fracture) on the plot. You can do this in any program you like as long as it looks professional.
B) The table contained in the lab manual. It''s broken up across two pages; you can call it two tables if you like. It doesn''t need to have the Resilience and Toughness, but all the other things in that table should be included. You have everything you need to calculate all that stuff except for chemical composition. You''ll need to look that up.
C) A plot of the average yield stress and ultimate stress observed in the samples, with error bars. These are lines, one standard deviation long, extending up and down from the mean. The ordinate, (Y-axis) of this graph should be stress, the abscissa (X-axis) will be simple categories: Steel, Aluminum, Brass. You can do one graph showing both Yield and Ultimate stresses, or two seperate graphs. Just make sure its clear. If you are unsure how to make this kind of graph, you can find it easily by searching the internet. Remember to title and label your graphs correctly