156B Week 5

MAE156B Progress Report Week 5

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

• • Materials selection; creased/hinged multimedia paper, coffee

  • Design focus finalized with sponsor; we can proceed with focusing on strength and functionality of the cast

  • Conducting numeric analysis

    • Beam bending for layer part of cast

Parts Arrived:

• • Heat-sealed plastic laminate sheets

Parts in Shipment:

• • Ball valves

  • Silicone sheets

Accomplishments from Previous Week

• • Casts Fabricated/Tested

    • Circular layer prototype

    • 20 creased/hinged multimedia paper layer (approximately 126mL), 42mL (25% of total volume) coffee grain prototype

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

• • Complete grain section for the large cast (Olesya)

  • Complete layer section for the large cast (Brian)

  • Research dimensions and thickness requirements

    • Continue beam bending analysis  (Kerrianne)

  • Assembly and testing of the cast (Dylan)

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

In Person (2/6/18)

• • • Clarified project definition

      • The minimum viable product is to improve stiffness from the initial paper-layer-coffee-grain prototype and streamline prototype fabrication. The circular layer/grain pouch geometries were one route to improve stiffness due to the prevention of slipping that would occur in flat cast geometries; however, improving the stiffness and materials selection for flat cast geometry will also fall within the project definition

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

In Person (2/1/18)

• • • Suggested extrapolating stiffness added by additional layers by modeling the layer jammer in the cast as a beam undergoing bending

      • Will provide insight on how many layers would be needed to reach our stiffness goal

      • Reference Roark’s Formulas for Stress and Strain

    • Suggested looking into wine vacuum (for preserving wine after uncorking its bottle) for a device that could create vacuums by hand

    • Measure vacuum required for cast stiffening with vacuum gauge to determine how powerful a pump is needed; i.e. can the vacuum be produced by hand?

      • Check to see if the labs have any pressure gauges calibrated and ready to use

    • Send an email to the instructors once the sponsor miscommunication issue is resolved

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

• • N/A

Schedule

• • Tackling the issues with the full size cast

Budget (list amount spent and amount remaining)

• • Amount remaining $2279.22, $120.78 spent

Progress on Report and Webpage

• • Working on the first draft of the report and webpage