156B Week 2 Progress

MAE 156B Project Update

Week 2: 04/05/15 - 4/11/15

Team 8:

Nerve Gripping

1. OVERVIEW AND PROJECT STATUS
  1. Collected Literature on Technical Analysis
  2. Fabricated Friction Testing System
    1. Will soon start test
2. LATEST ACCOMPLISHMENTS

- 1. Completed Individual Component Analysis
    1. Aileen - Nerve clamp mechanism designs
    2. Johnathan - Potential materials for nerve clamp concept
    3. Daniel - Finger trap mechanism designs
    4. Fabian - Potential materials for finger trap concept
  2. Constructed Coefficient of Friction Testing Mechanism

- - 1. Ramp design
    2. Tested with PDMS sample

- 1. Narrowed Down Designs
  2. Finger Trap Compression Relationship found and adapted
  3. Polymer-polymer Composite Considerations

- - 1. Prelim PDMS-Nylon linear analysis.
    2. Manufacturability Inextensive Consideration & Design
      1. Inviable due to prototyping material properties
        (Tg,ABS-P430105 C )

- 1. Nanoengineering Faculty -- they work on too small of a scale (Profiles Researched)

1. GOALS FOR NEXT WEEK

- 1. Technical Analysis on Designs (Forces/Stresses)
    1. Identify key equations for analysis
    2. Have numerical results for show
  2. Narrow Down Material Considerations
  3. Have proposed prototype design ideas
  4. Purchased viable materials
  5. Considerations for backbone attachment (?)
  6. Have Section Views, Normal Renderings, and Clear Presentation

1. SPONSOR COMMENTS
2. INSTRUCTOR COMMENTS

- 1. Gecko-Style Gripping (Not viable)
    1. Current design (Micro-wedges) works on dry, clean surfaces like glass
  2. Microbarbs (Viable)

- - 1. Found research that microbarbs are used in medical industry to grab onto tissue
    2. Need to find feasible method to machine

- 1. Finger Trap Mechanics

- - 1. Papers found with applicable FBD
    2. Papers found with equation of relationship between tension and compression with inputs

1. CURRENT PROJECT RISKS

- 1. Need to Find Biocompatible High Friction Materials
  2. Methods to Bond Gripping Mechanism to Stainless-Steel Backbone
  3. Need to Find Biocompatible with slow transient property degradation (Stiffness)

1. NEEDED RESOURCES AND INFORMATION

- 1. Micro-machining Information
    1. Need to find resources on how to machine on our small scale
  2. Accessibility of proposed materials

1. UPCOMING MILESTONES

- 1. Design Proposal Presentation 4/16/15
  2. Friction Testing Completion-Week 3

1. BUDGET UPDATE

- 1. $0 Spent
  2. $1000 Parts Budget Remaining

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