{"id":{"repo_id":"washington","oai_identifier":"oai:digital.lib.washington.edu:1773/35256"},"canonical_url":"https://search.dev.ndltd.org/etd/washington/oai:digital.lib.washington.edu:1773/35256","repository":{"repo_id":"washington","name":"University of Washington","base_url":"https://digital.lib.washington.edu/server/oai/request"},"display":{"title":"Stiffness and Strength Predictions of Discontinuous Fiber Composites","abstract":"The overall goal of this study is to develop a numerical modeling approach that will ultimately lead to the certification of discontinuous fiber composites based on analysis and modest experimental verification. A discontinuous fiber composite (DFC) material system called HexMC is considered in this study. A stochastic (Monte Carlo-type) finite-element modeling approach called the Stochastic Laminate Analogy has been developed. During a typical analysis the DFC structure of interest is divided into regions called Random Laminate Volume Elements (RLVEs). A unique randomly-generated and non-symmetric stacking sequence is assigned to each RLVE. Experimentally-observed variations in the stiffness of a DFC part are then simulated by performing many FE analyses, where a new random stacking sequence is generated for each RLVE during each analysis. Fracture predictions are obtained through a damage accumulation model called the ply discount scheme. Final structural failure of the part is declared when all plies within a single element have failed. Other definitions of final structural failure are also explored in this study. A typical analysis predicts that ply failures (i.e., “damage”) will evolve in a distributed manner throughout a typical DFC structure, even in the presence of stress risers. This damage pattern is in qualitative agreement with experimental observation. Analyses of un-notched and notched tension coupon specimens are discussed in this paper, and predicted B-basis and B-Max measures of modulus and strengths are presented.","abstract_html":"The overall goal of this study is to develop a numerical modeling approach that will ultimately lead to the certification of discontinuous fiber composites based on analysis and modest experimental verification. A discontinuous fiber composite (DFC) material system called HexMC is considered in this study. A stochastic (Monte Carlo-type) finite-element modeling approach called the Stochastic Laminate Analogy has been developed. During a typical analysis the DFC structure of interest is divided into regions called Random Laminate Volume Elements (RLVEs). A unique randomly-generated and non-symmetric stacking sequence is assigned to each RLVE. Experimentally-observed variations in the stiffness of a DFC part are then simulated by performing many FE analyses, where a new random stacking sequence is generated for each RLVE during each analysis. Fracture predictions are obtained through a damage accumulation model called the ply discount scheme. Final structural failure of the part is declared when all plies within a single element have failed. Other definitions of final structural failure are also explored in this study. A typical analysis predicts that ply failures (i.e., “damage”) will evolve in a distributed manner throughout a typical DFC structure, even in the presence of stress risers. This damage pattern is in qualitative agreement with experimental observation. Analyses of un-notched and notched tension coupon specimens are discussed in this paper, and predicted B-basis and B-Max measures of modulus and strengths are presented.","abstract_has_math":false,"creators":["Harban, Karen"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Tuttle, Mark"],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-03-11","date_published":"2016-03-11","updated_at":"2026-07-24T05:58:18Z","subjects":[],"languages":["en_US"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1773/35256","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Tuttle, Mark"]},{"key":"dc:creator","label":"Author","values":["Harban, Karen"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-03-11T22:41:41Z"]},{"key":"dc:date.issued","label":"Date","values":["2016-03-11"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["Harban_washington_0250O_15415.pdf"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1773/35256"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis (Master's)--University of Washington, 2015-12"]},{"key":"dc:description.abstract","label":"Abstract","values":["The overall goal of this study is to develop a numerical modeling approach that will ultimately lead to the certification of discontinuous fiber composites based on analysis and modest experimental verification. A discontinuous fiber composite (DFC) material system called HexMC is considered in this study. A stochastic (Monte Carlo-type) finite-element modeling approach called the Stochastic Laminate Analogy has been developed. During a typical analysis the DFC structure of interest is divided into regions called Random Laminate Volume Elements (RLVEs). A unique randomly-generated and non-symmetric stacking sequence is assigned to each RLVE. Experimentally-observed variations in the stiffness of a DFC part are then simulated by performing many FE analyses, where a new random stacking sequence is generated for each RLVE during each analysis. Fracture predictions are obtained through a damage accumulation model called the ply discount scheme. Final structural failure of the part is declared when all plies within a single element have failed. Other definitions of final structural failure are also explored in this study. A typical analysis predicts that ply failures (i.e., “damage”) will evolve in a distributed manner throughout a typical DFC structure, even in the presence of stress risers. This damage pattern is in qualitative agreement with experimental observation. Analyses of un-notched and notched tension coupon specimens are discussed in this paper, and predicted B-basis and B-Max measures of modulus and strengths are presented."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Stiffness and Strength Predictions of Discontinuous Fiber Composites"]}]}],"canonical_facts":{"dc:contributor.advisor":["Tuttle, Mark"],"dc:creator":["Harban, Karen"],"dc:date.accessioned":["2016-03-11T22:41:41Z"],"dc:date.issued":["2016-03-11"],"dc:description":["Thesis (Master's)--University of Washington, 2015-12"],"dc:description.abstract":["The overall goal of this study is to develop a numerical modeling approach that will ultimately lead to the certification of discontinuous fiber composites based on analysis and modest experimental verification. A discontinuous fiber composite (DFC) material system called HexMC is considered in this study. A stochastic (Monte Carlo-type) finite-element modeling approach called the Stochastic Laminate Analogy has been developed. During a typical analysis the DFC structure of interest is divided into regions called Random Laminate Volume Elements (RLVEs). A unique randomly-generated and non-symmetric stacking sequence is assigned to each RLVE. Experimentally-observed variations in the stiffness of a DFC part are then simulated by performing many FE analyses, where a new random stacking sequence is generated for each RLVE during each analysis. Fracture predictions are obtained through a damage accumulation model called the ply discount scheme. Final structural failure of the part is declared when all plies within a single element have failed. Other definitions of final structural failure are also explored in this study. A typical analysis predicts that ply failures (i.e., “damage”) will evolve in a distributed manner throughout a typical DFC structure, even in the presence of stress risers. This damage pattern is in qualitative agreement with experimental observation. Analyses of un-notched and notched tension coupon specimens are discussed in this paper, and predicted B-basis and B-Max measures of modulus and strengths are presented."],"dc:format.mimetype":["application/pdf"],"dc:identifier.other":["Harban_washington_0250O_15415.pdf"],"dc:identifier.uri":["http://hdl.handle.net/1773/35256"],"dc:language.iso":["en_US"],"dc:title":["Stiffness and Strength Predictions of Discontinuous Fiber Composites"],"dc:type":["Thesis"]},"updated_at":"2026-07-24T05:58:18Z"}