Design and large deformation response of additively-manufactured shell-lattices

Open-cell cellular solids are porous structures with a large variety of applications, from energy absorption to medical engineering. In an attempt to identify isotropic configurations with high low and large strain mechanical properties, detailed numerical simulations are conducted on a wide range of mesostructures of cubic symmetry. Results are partially validated through uniaxial compression of specimens made of 316L stainless steel via selective laser melting. In a first study the large deformation responses of four different mesostructures of relative density 20% are compared: an octet truss-lattice, tube-lattice, a sphere assembly and a tube/sphere hybrid. It is concluded that periodic shell structures provide superior strength and energy absorption capacity for the same weight, as compared to truss-lattices.

Name thesis:degree_name

Doctoral

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Mechanical Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2019

Author dc:creator

• Bonatti, Colin.

Advisor dc:contributor.advisor

• Tomasz Wierzbicki and Dirk Mohr.

• Mechanical Engineering.

Statement dc:rights

• MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/121763

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/121763