User:Christiansweet/project2

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Project Preference

 * MakerBot PLA Material Characterization

Problem Statement
''In one or two sentences, describe the project that your group will be working on. Identify which one or two CDIO documents your group will create in this project cycle.''

Project Plan
Week one: Run a three point bending test for the glow in the dark PLA.

This week I was tasked with running a three point bending test for the glow in the dark PLA that was printed in length by width cross sections. I followed the experimental design process that was used by every group member(3 Point Bending Experiment). The data that I collected is displayed below.

Beam Dimensions-       L = .19m     w= .01003m       h= .00526m

Beam Color-   Glow in the dark

Beam Fill Direction- Cross sections printed L x w

 To further verify my data, i calculated the percentage error for two points that i did not use in my original measurements.

From the average percent difference of 5.69% i can conclude that my results are a liable measurement for the elastic modulus of the glow in the dark PLA rectangle created form L x w cross sections.

Week 2 Narrative
This week our groups goal was to analyze if the color of PLA had any effect on the stiffness of the PLA. In order to do this we would need at least ten trials of each color we are comparing in order to run statistical analysis in the form of a two sample Z-test. My objective this week was to first find out the type of test we would need for analysis, which is the two sample Z-test, and complete a total of 10 three point bending tests for the glow in the dark PLA. Below is the average E values for each trial using the glow in the dark PLA.   Beam Dimensions: L= .19 m   w= .01003 m   h= .00526 m       Beam Color: Glow in the dark           Fill direction: L x w cross sections    After all group members have completed their average E value calculations, i plan on running two sample Z-tests to compare the five different colors that are being used. The analysis will be ready for our groups next presentation.

Week 3 Narrative
This week our groups goal was to analyze the print style of PLA and its effect on the Elastic Modulus of the printed PLA. We decided to use Blue PLA so we could do more LxW comparisons as well as comparisons for LxW, LxH, and WxH. I was tasked with completing ten tests for for the blue PLA printed LxW and ten tests for the blue PLA printed WxH.  Beam Dimensions: L= .19 m   w= .01009 m   h= .00539 m       Beam Color: Blue           Fill direction: L x w cross sections

<br \> <br\ > For the WxH tests the PLA bar was smaller so the experimental procedure had to be altered. First, a new testing stand was set up that allowed an easier transfer of weights. Then the mass increments used to run the tests were changed to 500g, 1000g, 1500g, and 2000g.<br \> <br \> Beam Dimensions: L= .12966 m   w= .01004 m   h= .00517 m  <br \>     Beam Color: Blue      <br \>     Fill direction: w x h cross sections<br \>

<br \> For the statistical analysis the results are as follows:<br \> For LxW colors: <br \> -Green vs. Clear - E value differs<br \> -Green vs. Glow - E value differs<br \> -Green vs. Red - E value does not differ<br \> -Green vs. Black - E value does not differ<br \> -Clear vs. Glow - E value does not differ<br \> -Clear vs. Red - E value differs<br \> -Clear vs. Black - E value differs<br \> -Glow vs. Red - E value differs<br \> -Glow vs. Black - E value does not differ<br \> -Red vs. Black - E value does not differ<br \> -Blue vs. Green - E value does not differ<br \> -Blue vs. Clear - E value differs<br \> -Blue vs. Glow - E value does not differ<br \> -Blue vs. Red - E value does not differ<br \> -Blue vs. Black - E value does not differ<br \> <br \> For the print style: <br \> LxW vs. WxH - E value differs significantly <br \> LxW vs. LxH - E value does not differ <br \> WxH vs. LxH - E value differs significantly<br \> <br \> In next weeks narrative and the final CDIO report a list will be compiled to label the colors of PLA and print style in order of Elastic Modulus.

Week 4 Narrative
This week I helped work on completing the 2-point bending test, as well as creating a easy to read list for the strengths of PLA. <br \> Based on the colors that we used to measure the Elasticity value, our stiffness values from least to greatest are shown as: <br \> Clear > Luminescent > Blue = Black > Green = Red <br \> For the Print style the stiffness values from least to greatest are: <br \> LxW = LxH > WxH <br \> These simple lists allow future users of the maker bot decide which PLA type would be best for the object they are printing. For example if someone were to needd to print an object with the highest possible stiffness, they would print either LxW or LxH using Clear PLA.