Week Seven

Between the last week's lab and this week's lab, we developed two Matlab programs to aid in the analysis and redesign of our bones.  The first is called Find_Modulus.m, and it prompts the user for specifications on the geometry of the cross section, the span of the supports, the data from the three point flexural test, and two user defined numbers.  Once the the first few portions were entered, the program graphs the data and requests a threshold.  The threshold determines where the program recognizes that the bone broke.  If the distance between two adjacent points is larger than the threshold, then the program separates the data at that point.  The second number it asks for is the number points to skip at the beginning of the test.  This is so that if the applicator isn't contacting the bone at the beginning of the test, it won't affect the data.    

The program's prompt for a threshold, showing the graph of the data.

Once the data is input, the program generates a graph of the approximate cross section, and a second graph of the data showing what section was used for the analysis.  The final outputs are the bending stiffness and the modulus.

The approximate cross section, and the graph of the data from the test as displayed by the Matlab program.

In this week's lab we tested all of the bones we printed and modified in the previous week.  We will analyze the data later this week.