Fracture characterization of cortical bone at the micrometer and nanometer length scales

Orieka, Oke

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https://hdl.handle.net/2142/95414 Copy

Description

Title

Fracture characterization of cortical bone at the micrometer and nanometer length scales

Author(s)

Orieka, Oke

Issue Date

2016-12-08

Director of Research (if dissertation) or Advisor (if thesis)

Akono, Ange-Therese

Department of Study

Civil & Environmental Eng

Discipline

Civil Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• Fracture
• Bone

Abstract

Fracture in bone is common in a wide variety of health situations, and is of particular interest to structural engineers due to the adaptability of bone tissue in response to applied stresses. Investigations into the fracture processes within bone tissue can aid in developing medical therapies to combat bone fracture. Information from researching bone fracture can also aid in designing composite materials which exhibit bone’s characteristic high toughness and strength. Biological materials like bone exhibit behavior and functions that are the direct product of the interactions between the hierarchical structures that form the building blocks within the material. To fully understand the mechanical properties associated with bone and relate these properties to the scale of the mechanical characterization test, mechanical testing must be designed to engage the different responses of the hierarchical structures within bone. The purpose of the research presented in this thesis is to characterize fracture in cortical bone tissue using novel methods of small-scale mechanical testing such as micro-scratch tests and nanoindentation. Specimens are chosen and prepared in a manner that facilitates reproducible testing, and rigorous experimental protocols in nanoindentation and scratch testing are applied. The presented research confirms fracture behavior through scanning electron microscopy, and then applies nonlinear fracture mechanics to determine the fracture toughness of the bone tissue. The results from this research are key findings in confirming our methods with the literature with respect to nanoindentation, and to expanding the application of the novel scratch test in fracture investigations of a complex material.

Graduation Semester

2016-12

Type of Resource

text

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http://hdl.handle.net/2142/95414

Copyright and License Information

Copyright 2016 Oke Orieka

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