Journal of Materials Science

, Volume 47, Issue 18, pp 6621–6632 | Cite as

Effects of material heterogeneities on the compressive response of thiol-ene pyramidal lattices

  • R. G. RinaldiEmail author
  • J. Bernal-Ostos
  • C. I. Hammetter
  • A. J. Jacobsen
  • F. W. Zok


A process of directed UV photo-curing was previously developed for producing periodic thiol-ene lattices, with potential for use in lightweight structures. The present study probes the compressive response of two families of such lattices: with either one or two layers of a pyramidal truss structure. The principal goals are to assess whether the strengths of the lattices attain levels predicted by micromechanical models and to ascertain the role of lattice heterogeneities. These goals are accomplished through characterization of the lattice geometries via X-ray computed tomography and optical microscopy, measurements of the mechanical properties of the constituent thiol-ene and those of the lattices, and strain mapping on the lattices during compressive loading. Comparisons are also made with the properties of the thiol-ene alone, produced in bulk form. We find two lattice heterogeneities: (i) variations in strut diameter, from smallest at the top surface where the incident UV beam impinges on the monomer bath to largest at the bottom surface; and (ii) variations in physical and mechanical properties, with regions near the top surface being stiffest and strongest and exhibiting the highest glass transition temperature. Finally, we find that the measured strengths of the lattices are in accord with the model predictions when the geometric and material property variations are taken into account in the micromechanical models.


Peak Stress Micromechanical Model Slenderness Ratio Lattice Geometry Middle Node 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This study was supported by the Institute for Collaborative Biotechnologies through Grant W911NF-09-0001 from the US Army Research Office. The content of the information does not necessarily reflect the position or the policy of the Government and no official endorsement should be inferred. Beamtime at the Advanced Light Source was acquired with proposal titled “X-Ray Tomography of Co-Continuous Polymeric Composite Materials for Blast Mitigation” (ALS-04549). The Advanced Light Source is supported by the Director, Office of Basic Energy Sciences of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The authors gratefully acknowledge Dr. Dula Parkinson for his assistance with the beamline experiments and post-processing of the data in generating the tomographic images. The authors also thank Prof. L. Chazeau and Dr. J.-M. Chenal of MATEIS Lyon for use of their facilities in performing the DMA measurements.


  1. 1.
    Ashby M (2006) Phys Eng Sci 364:15CrossRefGoogle Scholar
  2. 2.
    Fleck N, Deshpande V, Ashby M (2010) Proc R Soc A 466:2495CrossRefGoogle Scholar
  3. 3.
    Gibson LJ, Ashby MF (1999) Cellular solids: structure and properties. Cambridge University Press, CambridgeGoogle Scholar
  4. 4.
    Ashby M, Evans A, Fleck N, Gibson L, Hutchinson J, Wadley H, Delale F (2001) Appl Mech Rev 54:B105CrossRefGoogle Scholar
  5. 5.
    Deshpande V, Ashby M, Fleck N (2001) Acta Mater 49:1035CrossRefGoogle Scholar
  6. 6.
    Wadley HNG, Fleck NA, Evans AG (2003) Compos Sci Technol 63:2331CrossRefGoogle Scholar
  7. 7.
    Wadley HNG (2006) Philos Trans R Soc A 364:31CrossRefGoogle Scholar
  8. 8.
    Wallach J, Gibson L (2001) Int J Solids Struct 38:7181CrossRefGoogle Scholar
  9. 9.
    Wang J, Evans A, Dharmasena K, Wadley H (2003) Int J Solids Struct 40:6981CrossRefGoogle Scholar
  10. 10.
    Zupan M, Deshpande V, Fleck N (2004) Eur J Mech A Solid 23:411CrossRefGoogle Scholar
  11. 11.
    Heinl P, Korner C, Singer RF (2008) Adv Eng Mater 10:882CrossRefGoogle Scholar
  12. 12.
    Rodriguez JF, Thomas JP, Renaud JE (2000) Rapid Prototyp J 6:175CrossRefGoogle Scholar
  13. 13.
    Rodriguez JF, Thomas JP, Renaud JE (2003) J Mech Des 125:545CrossRefGoogle Scholar
  14. 14.
    Ahn SH, Montero M, Odell D, Roundy S, Wright PK (2002) Rapid Prototyp J 8:248CrossRefGoogle Scholar
  15. 15.
    Lee B, Abdullah J, Khan Z (2005) J Mater Process Technol 169:54CrossRefGoogle Scholar
  16. 16.
    Jacobsen AJ, Barvosa Carter W, Nutt S (2007) Adv Mater 19:3892CrossRefGoogle Scholar
  17. 17.
    Jacobsen AJ, Barvosa-Carter W, Nutt S (2008) Acta Mater 56:2540CrossRefGoogle Scholar
  18. 18.
    Hoyle CE, Bowman CN (2010) Angew Chem Int Ed 49:1540CrossRefGoogle Scholar
  19. 19.
    Lowe AB (2009) Polym Chem 1:17CrossRefGoogle Scholar
  20. 20.
    Jacobsen AJ, Barvosa-Carter W, Nutt S (2007) Acta Mater 55:6724CrossRefGoogle Scholar
  21. 21.
    Jacobsen AJ, Barvosa-Carter W, Nutt S (2008) Acta Mater 56:1209CrossRefGoogle Scholar
  22. 22.
    Desilles N, Lecamp L, Lebaudy P, Bunel C (2003) Polymer 44:6159CrossRefGoogle Scholar
  23. 23.
    Desilles N, Lecamp L, Lebaudy P, Bunel C (2004) Polymer 45:1439CrossRefGoogle Scholar
  24. 24.
    Treloar LRG (2005) The physics of rubber elasticity. Oxford University Press, New YorkGoogle Scholar
  25. 25.
    Ward I, Pinnock P (1966) Br J Appl Phys 17:3CrossRefGoogle Scholar
  26. 26.
    Eyring H (1936) J Chem Phys 4:283CrossRefGoogle Scholar
  27. 27.
    Hammetter CI, Rinaldi RG, Zok FW (2012) J Mech Phys SolidGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • R. G. Rinaldi
    • 1
    Email author
  • J. Bernal-Ostos
    • 1
  • C. I. Hammetter
    • 2
  • A. J. Jacobsen
    • 3
  • F. W. Zok
    • 1
  1. 1.Department of MaterialsUniversity of CaliforniaSanta BarbaraUSA
  2. 2.Department of Mechanical EngineeringUniversity of CaliforniaSanta BarbaraUSA
  3. 3.HRL LaboratoriesLLCMalibuUSA

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