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Rapid Toolers: Jordan Medeiros Stephanie Silberstein Hannah Yun

Investigation of the Mechanical Properties of a Single-Cell Tetrakaidecahedron using 3-Dimensional Printing (3DP TM ). Rapid Toolers: Jordan Medeiros Stephanie Silberstein Hannah Yun. 3.042 Final Design Presentation May 12, 2005. Overview. Motivation

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Rapid Toolers: Jordan Medeiros Stephanie Silberstein Hannah Yun

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  1. Investigation of the Mechanical Properties of a Single-Cell Tetrakaidecahedron using 3-Dimensional Printing (3DPTM) Rapid Toolers: Jordan Medeiros Stephanie Silberstein Hannah Yun 3.042 Final Design Presentation May 12, 2005

  2. Overview • Motivation • Materials Selection & 3D Printing Process • The Tetrakaidehedron • Crystallography • Designing Unit in SolidWorks • Finite Element Analysis (ANSYS) • Mechanical Testing • Conclusions • Further Research

  3. Structure - Possible Applications - Motivation: What and why?

  4. Plaster – b ased Cellulose/starch based Materials Selection Powder BaseImpregnation Material

  5. Materials Selection • Cyanoacrylate (C5H5NO2) • “Z Bond 101” – Moisture Cured • Flexural Strength: 17.2 MPa* (2,495 psi) • E ~ 2.7 GPa* (391,600 psi) * Jim Bredt, Z-Corp

  6. Overall Printing Process

  7. Crystallography These diagrams illustrate the symmetry of the tetrakaidecahedron structure. The tetrakaidecahedron belongs to the highest ordered cubic point group, shown to the left.

  8. Building the Model

  9. Finite Element Analysis • Tension vs. Compression • Von Mises  directional stress/strain and planar shear

  10. Which Happens First? Reminder: Yellow represents fracture strength for compression Light Blue represents fracture strength for tension

  11. Tetrakaidehedra Testing Printing & compression in three directions:

  12. Tetrakaidehedra Testing

  13. Characterization of Materials Properties • ASTM D695-02a (Compressive) • ASTM D638-03 (Tensile)

  14. Characterization of Materials Properties Note: company info: E ~ 391,000 psi tetra. max σ ~ 250 to 800 psi

  15. Conclusions • The tetrakaidecahedron unit struts fail in tension • Layer-by-layer processing introduces a level of anisotropy into the material. • Much of our data for our compressive and tensile standards is inconsistent, possibly a result of: • The concentration and depth of cyanoacrylate impregnation into the samples being non-constant • Warping of the samples during the printing process

  16. Further Research Possibilities • Changing variables • Further mechanical testing • Analysis on three-dimensional (multi-cell) array of tetrakaidecahedra

  17. Thank You! • Prof. Chiang, Prof. Roylance, Mr. Toby Bashaw • Dr. Joe Parse, Dr. Yin-Lin Xie • Prof. Lorna Gibson • Prof. Bernhardt Wuensch

  18. Questions?

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