156B Week 8

MAE156B Progress Report Week 8

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • Testing wire mesh

    • Mesh purchase required, not available at local stores

  • Analysis

    • Three-point bending still under way

    • Layer count vs. Thickness nearing completion

    • Young modulus analysis equations found

  • Final prototype for testing is almost finished; results should be available by Thursday

Parts in Shipment:

• • Ball valves

  • Silicone rolls, velcro, RTV, scissors

Accomplishments from Previous Week

• • Literature Research: “Characterization of Particulate in Vacuum Casting for Long Term Space Flight” by Devin Elizabeth Gibson (Brian)

  • Testing carbon fiber (Kerrianne)

  • Testing carbon fiber with coffee grains (Olesya)

  • Learn how to use a three-point bending test (Brian, Dylan)

  • Quantify vacuum magnitude with vacuum gauge: -94.8kPa (Olesya)

  • Compile testing results in PowerPoint for sponsor (Kerrianne)

  • Refine length of coffee pouch so it wraps fully around (Olesya)

  • Research layer manipulation methods, including origami and steaming (Dylan, Olesya)

  • Ongoing manufacturing of prototype with all bells and whistles implemented (Olesya)

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • Composite beam analysis (Brian)

  • Test final design (Olesya)

  • Start working on the full sized cast (Kerrianne)

  • Report writing (Dylan)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments

Week 8: No Sponsor Meeting

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

In Person: (2/22/18)

• • Is the three-point bending test a valid test for E of coffee?

    • In the cast, the grains are always in compression, but the bending test has some parts in compression by definition

    • We will address this issue by testing multiple samples and comparing the results

      • Layer-grain composite cast

      • All-layer cast of the same thickness

  • Will the grain pouch not fully overlapping the arm affect stiffness?

    • One of the long cast samples’ grain pouch was not long enough to cover the entire 5.08cm (2in), possibly affecting test results

    • Important to consider because different arm thicknesses will need different grain pouch lengths to fully encircle the arm

    • Currently focusing on how the cylinder is implemented during testing rather than creating a one-size fits all cast

  • Sponsor’s goal is to have good documentation: is grain bunching still a concern?

    • Grain bunching is still a concern, but it was reduced by including 50-50% by volume carbon fibers-coffee grains, possibly because the former helps evenly distribute the latter

Comments from Other Students in the Class (indicate date of comments and if via email or in person)

• • N/A

Risks and Areas of Concern

• • N/A

Resources or Information Required but not Available

• • Ball valves - lost in shipping?

  • Wire mesh

Schedule

Budget (list amount spent and amount remaining)

• • Amount remaining $2199.22, $200.78 spent

  • Parts requiring approval

Progress on Report and Webpage

• • All data compiled to put in the report