Research

Design for Additive Manufacturing; Novel Materials and Structures

Summary:
Additive manufacturing (AM) techniques (such as selective laser sintering, stereolithography, direct metal deposition, and others) enable the fabrication of parts with complex, freeform, internal and external architectures. We are exploring opportunities for leveraging this design freedom to enhance the functionality of structures. Functional roles include lightweight stiffness, strength, and compliance; impact, energy, or acoustic absorption; and heat exchange or insulation. Two recent applications include the design of deployable structures with lattice skins and the design of energy absorbing materials and structures. The energy-aborption project, funded by DARPA and ARO, involves topology design and experimental validation of networks of energy-absorbing structures that exploit bistable or negative stiffness behavior to provide combinations of high stiffness for load-bearing and high damping for dissipation of acoustic and mechanical impacts and vibrations.

Collaborators:
David Bourell, Michael Haberman, Preston Wilson

Post-doctoral Researcher:

David Shahan

Students:
Ben Fulcher, Tim Klatt

(Alumni: Lia Kashdan, Uma Maheshwaraa, Guarav Gupta)

Sponsors:

DARPA, ARO, UT Applied Research Laboratories

Designer's Guide for Dimensioning and Tolerancing SLS Parts

Related Publications:

Kashdan, L., C.C. Seepersad, M. Haberman, and P. Wilson, 2011, "Design, Fabrication, and Evaluation of Negative Stiffness Elements Using Selective Laser Sintering," Rapid Prototyping Journal, In Press

Maheshwaraa, U. and C.C. Seepersad, 2011, “Topology Design and Freeform Fabrication of Deployable Structures with Lattice Skins,” Rapid Prototyping Journal, Vol. 17, No. 1, pp. 5-16.

Panchal, J., D.L. McDowell, H.-J. Choi, C.C. Seepersad, J.K. Allen, F. Mistree, 2010, Integrated Design of Multiscale, Multifunctional Materials and Products, Elsevier (Butterworth-Heinemann), Burlington, MA. (Available on Amazon.com)

Telenko, C. and C.C. Seepersad, 2010, “Assessing Energy Requirements and Material Flows of Selective Laser Sintering of Nylon Parts,” Solid Freeform Fabrication Symposium, (D. L. Bourell, J. J. Beaman, R. H. Crawford, H. L. Marcus, and C. C. Seepersad, Eds.), Austin, TX.

Fey, N.P., B.J. South, C.C. Seepersad, and R.R. Neptune, 2009, “Topology Optimization and Freeform Fabrication Framework for Developing Prosthetic Feet,” Solid Freeform Fabrication Symposium, (D. L. Bourell, J. J. Beaman, R. H. Crawford, H. L. Marcus, and C. C. Seepersad, Eds.), Austin, TX.

Kashdan, L., C.C. Seepersad, M. Haberman, and P.Wilson, 2009, “Design, Fabrication, and Evaluation of Negative Stiffness Elements,” Solid Freeform Fabrication Symposium, (D. L. Bourell, J. J. Beaman, R. H. Crawford, H. L. Marcus, and C. C. Seepersad, Eds.), Austin, TX.

Gupta, G. and C. C. Seepersad, 2008, "Topology Design of Compliant Cellular Structures with Contact-Enabled, Graded Stiffness," 49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Schaumburg, IL, Paper Number: AIAA-2008-2262.

Seepersad, C. C., J. K. Allen, D. L. McDowell and F. Mistree, 2008, "Multifunctional Topology Design of Cellular Material Structures," ASME Journal of Mechanical Design, Vol. 130, No. 3, pp. 031404-1-13.

Maheshwaraa, U., C. C. Seepersad and D. L. Bourell, 2007, "Design and Freeform Fabrication of Deployable Structures with Lattice Skins," Rapid Prototyping Journal, Vol. 13, No. 4, pp. 213-225.

Maheshwaraa, U., C. C. Seepersad, and D.L. Bourell, 2007, "Topology Design and Freeform Fabrication of Deployable Structures with Lattice Skins," Solid Freeform Fabrication Symposium (D. L. Bourell, J. J. Beaman, R. H. Crawford, H. L. Marcus, C. C. Seepersad and K. L. Wood, Eds.), Austin, TX.

Seepersad, C. C., D. Shahan, and K. Madhavan, 2007, "Multiscale Design for Solid Freeform Fabrication," Solid Freeform Fabrication Symposium (D. L. Bourell, J. J. Beaman, R. H. Crawford, H. L. Marcus, C. C. Seepersad and K. L. Wood, Eds.), Austin, TX.

Gupta, G., J. Tan and C. C. Seepersad, 2006, "Design and Freeform Fabrication of Compliant Cellular Materials with Graded Stiffness," Solid Freeform Fabrication Symposium (D. L. Bourell, J. J. Beaman, R. H. Crawford, H. L. Marcus, C. C. Seepersad and K. L. Wood, Eds.), Austin, TX.

Maheshwaraa, U., C. Tradd, D. L. Bourell and C. C. Seepersad, 2006, "Design and Freeform Fabrication of Deployable Structures with Lattice Skins," Solid Freeform Fabrication Symposium (D. L. Bourell, J. J. Beaman, R. H. Crawford, H. L. Marcus, C. C. Seepersad and K. L. Wood, Eds.), Austin, TX.

Seepersad, C.C., J. K. Allen, D. L. McDowell, and F. Mistree, 2006, "Robust Design of Cellular Materials with Topological and Dimensional Imperfections," ASME Journal of Mechanical Design, Vol. 128, No. 6, pp. 1285-1297.

Seepersad, C. C., B. M. Dempsey, J. K. Allen, F. Mistree and D. L. McDowell, 2004, "Design of Multifunctional Honeycomb Materials," AIAA Journal, Vol. 42, No. 5, pp. 1025-1033.