151. microstructural origins of the dynamic behavior of wood

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: Graduate Program in Materials Science and Engineering
Faculty Advisor(s): Joanna M. McKittrick

Primary Student
Name: Albert Keisuke Matsushita
Email: akmatsus@ucsd.edu
Phone: 603-714-0131
Grad Year: 2021

Abstract
Sporting goods make ubiquitous use of impact resistant timbers which surpass other biological materials such as hydrated ram horn in their dynamic work to fracture. Wood high strain-rate behavior, however, is poorly understood. A combination of drop-weight testing, finite element analysis (FEA), and 3D printing were used to investigate the microstructural origins of maple and white oak?s impact behavior. White oak significantly under-performed maple in drop tower experiments despite its greater relative density, which in quasi-static loading conditions corresponds with greater mechanical strength. Using scanning electron microscopy (SEM) the microstructures of both woods were characterized and translated into truss models for FEA which revealed how the unique anatomy of each wood contributed to its impact response. These FEA models were simplified to provide 3D printed structures to test the effect of pore arrangement for efficient impact-absorbing structures. 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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