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Deformation behavior and energy absorption capability of polymer and ceramic-polymer composite microlattices under cyclic loading

Published online by Cambridge University Press:  31 January 2018

Almut Schroer ,
Jeffrey M. Wheeler  and
Ruth Schwaiger
Almut Schroer
Affiliation:
Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), Karlsruhe 76021, Germany
Jeffrey M. Wheeler
Affiliation:
Department of Materials, ETHZ – Swiss Federal Institute of Technology, Zurich 8093, Switzerland
Ruth Schwaiger*
Affiliation:
Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), Karlsruhe 76021, Germany
*
a) Address all correspondence to this author. e-mail: ruth.schwaiger@kit.edu
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Abstract

Specifically designed microlattices are able to combine outstanding mechanical and physical properties and, thus, expand the actual limits of the material property space. However, post-yield softening induced by plastic buckling or crushing of individual ligaments limits performance under cyclic loading, which affects their energy absorption capabilities. Understanding deformation under repeated loading is key to further optimizing these high-strength materials. While until now mainly hollow metallic microlattices and multistable or tailored buckling structures have been analyzed, this study investigates deformation and failure of polymer and ceramic-polymer microlattices under cyclic loading to understand the (i) influence of the microarchitecture and (ii) influence of processing conditions on the energy absorption capability. Despite fracture of individual struts, the stretching-dominated microarchitectures possess a superior behavior especially for larger cycle numbers. In combination with a specific annealing treatment of the polymer material, high recoverability and energy dissipation can be achieved.

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Type
Invited Articles
Information
Journal of Materials Research , Volume 33 , Issue 3: Focus Issue: Architected Materials , 14 February 2018 , pp. 274 - 289
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Katia Bertoldi

References

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