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Tunability and enhancement of mechanical behavior with additively manufactured bio-inspired hierarchical suture interfaces

Published online by Cambridge University Press:  24 July 2014

Erica Lin ,
Yaning Li ,
James C. Weaver ,
Christine Ortiz  and
Mary C. Boyce
Erica Lin*
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Yaning Li*
Affiliation:
Department of Mechanical Engineering, University of New Hampshire, Durham, NH 03824, USA
James C. Weaver
Affiliation:
Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138, USA
Christine Ortiz
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Mary C. Boyce*
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; and School of Engineering and Applied Sciences, Columbia University, New York, NY 10027, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In nature, biological structures often exhibit complex geometries that serve a wide range of specific mechanical functions. One such example are the ammonites, a large group of extinct mollusks, which produced elaborate, fractal-like hierarchical suture interface patterns. This report experimentally explores the influence of hierarchical suture interface designs on mechanical behavior by taking advantage of additive manufacturing and its ability to fabricate complex geometries. In addition, structure/property relationships of additively manufactured multi-material prototypes are investigated. It is shown that increasing the order of hierarchy amplifies stiffness by more than an order of magnitude. Tensile strength can also be tailored by changing the order of hierarchy, which alters the normal to shear stress ratio of the interfacial layer. The addition of failure mechanisms with increased order of hierarchy also significantly increases the toughness. Therefore, hierarchical suture interfaces can be used to diversify the mechanical behavior of additively manufactured materials.

Keywords

stress/strain relationshipstrengthtoughness
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 17: Focus Issue: The Materials Science of Additive Manufacturing , 14 September 2014 , pp. 1867 - 1875
Copyright
Copyright © Materials Research Society 2014 

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References

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