{"id":{"repo_id":"southwales","oai_identifier":"oai:pure.atira.dk:studenttheses/81a04d5c-462f-4032-a7cd-f8bd8dd06477"},"canonical_url":"https://search.dev.ndltd.org/etd/southwales/oai:pure.atira.dk:studenttheses/81a04d5c-462f-4032-a7cd-f8bd8dd06477","repository":{"repo_id":"southwales","name":"University of South Wales","base_url":"https://pure.southwales.ac.uk/ws/oai"},"display":{"title":"Crack propagation in isotropic materials","abstract":"This thesis presents a numerical study of crack propagation in brittle materials. The finite element method using constant strain triangular elements was used. The experimental investigation is based on Gurney and Hunt's quasi-static method of fracture testing.
The applicability of the finite element method of analysis to problems of fracture mechanics is demonstrated for the simple cases where a theoretical solution is obtainable. The comparison of both solutions gives good agreement.
The effect of test specimen geometry and the effect of halting the crack tip on one side of a symmetrical specimen on stability and the shape of P,u curve is investigated. Numerical P,u curves are produced and compared with those obtained experiment ally. A good correlation of results may be seen.
The possibility of using an O-section as a fracture toughness specimen is discussed.
Determination of the crack path using dV/da energy criterion is shown and the results are verified by experiments using the brittle lacquer technique.
Possible future work is discussed in the last chapter.
","abstract_html":"This thesis presents a numerical study of crack propagation in brittle materials. The finite element method using constant strain triangular elements was used. The experimental investigation is based on Gurney and Hunt's quasi-static method of fracture testing.<br/><br/>The applicability of the finite element method of analysis to problems of fracture mechanics is demonstrated for the simple cases where a theoretical solution is obtainable. The comparison of both solutions gives good agreement.<br/><br/>The effect of test specimen geometry and the effect of halting the crack tip on one side of a symmetrical specimen on stability and the shape of P,u curve is investigated. Numerical P,u curves are produced and compared with those obtained experiment ally. A good correlation of results may be seen.<br/><br/>The possibility of using an O-section as a fracture toughness specimen is discussed.<br/><br/>Determination of the crack path using dV/da energy criterion is shown and the results are verified by experiments using the brittle lacquer technique.<br/><br/>Possible future work is discussed in the last chapter.<br/>","abstract_has_math":false,"creators":["Coughlan, Jarmila"],"institution":"Glamorgan Polytechnic","degree_name":"Doctoral Thesis","degree_level":"Student thesis","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1973,"date_issued":"1973","date_published":"1973","updated_at":"2026-07-24T04:39:18Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:pure.atira.dk:studenttheses/81a04d5c-462f-4032-a7cd-f8bd8dd06477"],"render_values":[{"text":"oai:pure.atira.dk:studenttheses/81a04d5c-462f-4032-a7cd-f8bd8dd06477","href":null,"code":true}]}]},"links":{"outbound_url":"https://pure.southwales.ac.uk/en/studentTheses/81a04d5c-462f-4032-a7cd-f8bd8dd06477","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Coughlan, Jarmila"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1973"]},{"key":"dc:date.issued","label":"Date","values":["1973"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["Glamorgan Polytechnic"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://pure.southwales.ac.uk/en/studentTheses/81a04d5c-462f-4032-a7cd-f8bd8dd06477"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Student thesis"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Doctoral Thesis"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:pure.atira.dk:studenttheses/81a04d5c-462f-4032-a7cd-f8bd8dd06477","https://pure.southwales.ac.uk/en/studentTheses/81a04d5c-462f-4032-a7cd-f8bd8dd06477"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://pure.southwales.ac.uk/files/2714049/J_Coughlan_1973_2064722.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This thesis presents a numerical study of crack propagation in brittle materials. The finite element method using constant strain triangular elements was used. The experimental investigation is based on Gurney and Hunt's quasi-static method of fracture testing.
The applicability of the finite element method of analysis to problems of fracture mechanics is demonstrated for the simple cases where a theoretical solution is obtainable. The comparison of both solutions gives good agreement.
The effect of test specimen geometry and the effect of halting the crack tip on one side of a symmetrical specimen on stability and the shape of P,u curve is investigated. Numerical P,u curves are produced and compared with those obtained experiment ally. A good correlation of results may be seen.
The possibility of using an O-section as a fracture toughness specimen is discussed.
Determination of the crack path using dV/da energy criterion is shown and the results are verified by experiments using the brittle lacquer technique.
Possible future work is discussed in the last chapter.
"]},{"key":"dc:title","label":"Title","values":["Crack propagation in isotropic materials"]}]}],"canonical_facts":{"dc:creator":["Coughlan, Jarmila"],"dc:date":["1973"],"dc:date.issued":["1973"],"dc:description.abstract":["This thesis presents a numerical study of crack propagation in brittle materials. The finite element method using constant strain triangular elements was used. The experimental investigation is based on Gurney and Hunt's quasi-static method of fracture testing.
The applicability of the finite element method of analysis to problems of fracture mechanics is demonstrated for the simple cases where a theoretical solution is obtainable. The comparison of both solutions gives good agreement.
The effect of test specimen geometry and the effect of halting the crack tip on one side of a symmetrical specimen on stability and the shape of P,u curve is investigated. Numerical P,u curves are produced and compared with those obtained experiment ally. A good correlation of results may be seen.
The possibility of using an O-section as a fracture toughness specimen is discussed.
Determination of the crack path using dV/da energy criterion is shown and the results are verified by experiments using the brittle lacquer technique.
Possible future work is discussed in the last chapter.
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