Investigative Analysis on Mechanical Properties of Laser-Sintered-Nylon Diamond Lattices
Keywords:
Buzz News, Dropout layer, Fake news, Long Short Term Network Model, Social mediaAbstract
Additive manufacturing offers a manufacturing technique to produce complex geometry prototypes at a rapid pace and low cost. These advantages advocate additive manufacturing for the design and production of cellular structures. Cellular structures are interesting because they contain a large amount of porosity (void space of air) to manifest a lightweight structure. Designs of cellular structures generate a periodic pattern; often of complex geometry, called a lattice. The research involves PA2200 (Nylon 12) laser sintered diamond lattices with experimental compression testing and direct FEA model comparison. A correction factor is applied for a design offset of laser sintered lattices. Once applied, the experimental and FEA data agree in validating the diamond lattice as a bending-dominated structure. Diamond lattices show a 4th order relationship between stiffness and parameters of thickness and unit cell length. For density, stiffness maintains a 2nd order relationship, as predicted by bending dominated structures. The resulting stiffness can be tuned over a stiffness range of four orders of magnitude. Further research shows the results for modifying the diamond lattice and scaling stiffness and density using other materials (like metals) to expand the range of stiffness and compare diamond lattices on material property charts. Lastly, the effective Poisson’s ratio varies from 0.5 to 0.4 depending on the (t/L) ratio.
References
- Ashby, M.F., The Mechanical Properties of Cellular Solids. Metallurgical Transactions A, 1983. 14A.
- Elliot, J.C., Method of producing metal foam, in U.S. Patent No 2,751,289. 1956.
- Engelbrecht, S.S., Design of Meso-Scale Cellular Structure for Rapid Manufacturing, in Mechanical Engineering. 2009, Georgia Institute of Technology. p. 175.
- Luis Folgar, D.W.R., Gary Schulberger, Jim Williams, Cellular structures for optimal performace, in 20th Annual International Solid Freeform Fabrication Symposium, SFF. 2009: Austin, TX. p. 831-842.
- Gebhardt, A., Understanding Additive Manufacturing. 2012: Carl Hanser Verlag.
- I. Gibson, D.W.R., B. Stucker, Additive ManufacturingTechnologies: Rapid Prototyping to Direct Digital Manufacturing. 2010, New York: Springer.
- Tie Jun Cui, D.S., Rupeng Liu, Metamaterials Theory, Design, and Applications. 2010: Springer. 367.
- Jane Chu, S.E., Greg Graf, David W. Rosen, A comparison of synthesis methods for cellular structures with application to additive manufacturing. Rapid Prototyping Journal, 2010. 16 (4): p. 275-83
- D. M. Watts, R.J.H., Exploring the design freedom of RM, in Proceeding of the 17th International Solid Freeform Fabrication (SFF) Symposium. 2006: Austin, TX.
- Rosen, D.W., Design for additive manufacturing: a method to explore unexplored regions of the design space, in Proceedings of the 18th International Solid Freeform Fabrication (SFF) Symposium. 2007: Austin, TX.
- J. Schwerdtfeger, P.H., R. F. Singer, C. Korner, Auxetic cellular structures through selective electron-beam melting. Physics Status Solidi 2010. 247(2): p. 269-272.
Downloads
Published
Issue
Section
License
Copyright (c) IJSRST

This work is licensed under a Creative Commons Attribution 4.0 International License.