33. impact resistant biological materials and bioinspired designs

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: Agile - CaliBaja Center for Resilient Materials & Systems
Faculty Advisor(s): Joanna M. McKittrick

Primary Student
Name: Wei Huang
Email: w7huang@ucsd.edu
Phone: 858-263-5350
Grad Year: 2018

Bighorn sheep (Ovis canadensis) rams hurl themselves at each other at speeds of ~ 9 m/s (20 mph) to fight for dominance and mating rights. This necessitates that impact resistance is a predominate feature of their horns. Hooves from African zebra (Equus burchelli) support large dynamic, compressive impact loads during a relatively long cyclic period. Remarkable convergence of both structures and materials found in horns and hooves are observed. Optical and scanning electron microscope images show similar tubular structures in both horns and hooves, while the porosity is around 7% and 3.5%, respectively. Quasi-static compression and dynamic Hopkinson bar experiments in three orthogonal directions (longitudinal, radial and transverse) indicate the radial directions are the most energy absorption especially in a higher strain rate, while the highest stiffness comes from the longitudinal direction. Bioinspired composites with tubular structure are made by 3D printing. This work is supported by a Multi-University Research Initiative through the Air Force Office of Scientific Research (AFOSR-FA9550-15-1-0009).

Industry Application Area(s)
Aerospace, Defense, Security | Civil/Structural Engineering | Materials

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