Most composites exhibit a damping figure of merit, a crucial index of a material's dynamic behavior, lower than the value predicted by the Hashin–Shtrikman bound. This work found that the biomimetic hierarchical staggered composites inspired by bone structure can have a damping figure of merit tens of times higher than the Hashin–Shtrikman composite. The optimum state is achieved when the hard and soft phases contribute equally to the overall stiffness of the composite in the direction parallel to the platelets. At this optimal point, the model predicts that the overall stiffness is half the Voigt bound while the damping loss factor is half that of the soft phase. This behavior stems from a deformation mechanism transition from soft-phase-dominant to hard-phase-dominant as the platelet's aspect ratio increases. The findings from this study may have important implications in the future design of composites to mitigate vibration and absorb shock in load-bearing structures.
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Research-Article
Highly Enhanced Damping Figure of Merit in Biomimetic Hierarchical Staggered Composites
Pu Zhang,
Pu Zhang
Department of Mechanical Engineering and Materials Science,
e-mail: puz1@pitt.edu
University of Pittsburgh
,Pittsburgh, PA 15261
e-mail: puz1@pitt.edu
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Albert C. To
Albert C. To
1
Department of Mechanical Engineering and Materials Science,
e-mail: albertto@pitt.edu
University of Pittsburgh
,Pittsburgh, PA 15261
e-mail: albertto@pitt.edu
1Corresponding author.
Search for other works by this author on:
Pu Zhang
Department of Mechanical Engineering and Materials Science,
e-mail: puz1@pitt.edu
University of Pittsburgh
,Pittsburgh, PA 15261
e-mail: puz1@pitt.edu
Albert C. To
Department of Mechanical Engineering and Materials Science,
e-mail: albertto@pitt.edu
University of Pittsburgh
,Pittsburgh, PA 15261
e-mail: albertto@pitt.edu
1Corresponding author.
Manuscript received October 22, 2013; final manuscript received December 10, 2013; accepted manuscript posted December 13, 2013; published online January 15, 2014. Editor: Yonggang Huang.
J. Appl. Mech. May 2014, 81(5): 051015 (5 pages)
Published Online: January 15, 2014
Article history
Received:
October 22, 2013
Revision Received:
December 10, 2013
Accepted:
December 13, 2013
Citation
Zhang, P., and To, A. C. (January 15, 2014). "Highly Enhanced Damping Figure of Merit in Biomimetic Hierarchical Staggered Composites." ASME. J. Appl. Mech. May 2014; 81(5): 051015. https://doi.org/10.1115/1.4026239
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