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A Novel Joint between Dissimilar Materials Inspired by the Mechanics of Trees

Published online by Cambridge University Press:  01 February 2011

L. Roy Xu ,
Huacheng Kuai  and
Sreeparna Sengupta
L. Roy Xu
Affiliation:
Department of Civil and Environmental Engineering & Material Science Program VU Station B 351831, 2301, Vanderbilt Place Vanderbilt University, Nashville, TN 37235, USA
Huacheng Kuai
Affiliation:
Department of Civil and Environmental Engineering & Material Science Program VU Station B 351831, 2301, Vanderbilt Place Vanderbilt University, Nashville, TN 37235, USA
Sreeparna Sengupta
Affiliation:
Department of Civil and Environmental Engineering & Material Science Program VU Station B 351831, 2301, Vanderbilt Place Vanderbilt University, Nashville, TN 37235, USA
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Abstract

An integrated experimental and numerical investigation was conducted for removing the free-edge stress concentrations in dissimilar material joints. A convex interface/joint design, inspired by the shape and mechanics of trees, allows for least stress concentrations at bi-material corners for most engineering material combinations. In-situ photoelasticity experiments on convex polycarbonate-aluminum joints showed that the free-edge stress concentration was successfully removed. As a result, the new design not only improves the static load transfer capacity of dissimilar material joints, but also yields more reasonable interfacial tensile strength evaluation. For convex polycarbonate-aluminum and PMMA-aluminum joint specimens, the ultimate tensile load increased up to 81% while the total material volume reduced by at least 15% over that of traditional butt-joint specimens with severe free-edge stress concentrations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 844: Symposium Y – Mechanical Properties of Bio-Inspired and Biological Materials , 2004 , Y8.4
Copyright
Copyright © Materials Research Society 2005

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References

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