{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/95414"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/95414","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Fracture characterization of cortical bone at the micrometer and nanometer length scales","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Orieka, Oke"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Akono, Ange-Therese"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-03-01T15:49:33Z","date_published":"2017-03-01T15:49:33Z","updated_at":"2026-07-22T22:26:37Z","subjects":["Fracture","Bone"],"languages":["en"],"rights":["Copyright 2016 Oke Orieka"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/95414","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Akono, Ange-Therese"]},{"key":"dc:creator","label":"Author","values":["Orieka, Oke"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-03-01T15:49:33Z","2016-12-08","2016-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Fracture","Bone"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2016 Oke Orieka"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/95414"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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.","Submission original under an indefinite embargo labeled 'Open Access'. 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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.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-02-28 without embargo terms","The student, Oke Orieka, accepted the attached license on 2016-12-08 at 13:36.","The student, Oke Orieka, submitted this Thesis for approval on 2016-12-08 at 14:00.","This Thesis was approved for publication on 2016-12-08 at 15:34.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10479 on 2017-02-28 at 15:03:44","Made available in DSpace on 2017-03-01T15:49:33Z (GMT). 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