User:Ewoo9740/ENES-100/project 2

My Instructor's course page which points to this.

Project Preference
''Your class was given a list of projects to choose from. Please list the three projects you want to work on, from highest to lowest.''

Problem Statement
''In one or two sentences, describe the project that your group will be working on. Identify what CDIO phase (Conceive, Design, Implement, or Operate) your group will complete in this project cycle.''

Project Plan
Briefly describe your group's plan for the next 4 weeks, including major tasks that will be completed each week.

Week 5 Narrative
Continued prototype testing but with the rectangular prism and the pentagonal prism. The pieces were made out of cardboard and and each had a .5 inch sided piece and a 1 inch sided piece. Found that the rectangular prism with .5 inch sides breaking point was between 3 to 4 pounds and the 1 inch sided one broke between 12 to 15 pounds. The pentagonal's breaking point for the .5 inch sided piece was between 7 to 10 pounds and the breaking point for the 1 inch sided piece was between 17 to 20 pounds. So next is to test the actual 3D printed pieces now that there is an idea of what might be stronger and what might be weaker.

Week 6 Narrative
There wasn't anything to measure deflection while testing the pieces so testing was pushed back a little. Created a prototype of the deflection gauge out of loose leaf paper so testing could maybe begin but it never got used. the next class, the test rig was forgotten so we couldn't test the piece but there was also not much time to test. This upcoming week after getting more suggestions, testing will be moving along hopefully. Pieces will continually be printed

Week 7 Narrative
Calculated the the bending stress of the different width ropes to see if it makes a difference when used during testing. Found that the 1 inch width rope applies less bending stress. When 10 pounds is the force applied the psi for the single strand is 840 psi and with the 1 inch rope the bending stress is 780 psi. For now on testing will be only done with the single strand so it is more of a 3 point test instead of spreading the force over 1 inch. So next is to test pieces and use the deflection gauge to find the deflection. Also record the piece so it can capture the last deflection before it breaks.

Week 8 Narrative
Converted pounds to grams so the units would be the same for the weight of the pieces and the weight used to break the pieces. Calculated the ratio of the how weight of the material needed per gram held. Tested a green pentagonal prism and cylinder. Put the weight in the bucket by increments of 2.5 pounds until 30 and then went by increments of 1 pound. Next is to continue to test and maybe do more variables like the infill or a different color than green and red PLA material.
 * Red Rectangular Prism- 3.605x10^-4
 * Green Rectangular Prism- 4.299x0^-4
 * Green Triangular Prism- 5.512x10^-4
 * Red Pentagonal Prism- 5.946x10^-4