{"id":{"repo_id":"brazil-uerj","oai_identifier":"oai:pantheon.ufrj.br:11422/3473"},"canonical_url":"https://search.dev.ndltd.org/etd/brazil-uerj/oai:pantheon.ufrj.br:11422/3473","repository":{"repo_id":"brazil-uerj","name":"Brazil UERJ","base_url":"https://pantheon.ufrj.br/oai/request"},"display":{"title":"Ensaios de extrusão de barras entre matrizes de perfil sigmoidal","abstract":"Preliminarily, simple and plane-strain compression tests were made with pure and commercial lead in order to determine their isotropy and work-hardening conditions. Strip-extrusion experiments were afterwards made with a sigmoidal die profile for the maximum reduction condition, and with a straight die profile with the sarne reduction and axial lenght. The resul ts were compare d with those predi cted by the sigmoidal profile theory and comparisons were made between the two types of profiles. The influences on the process of work-hardening, friction and granulometry were also verified.","abstract_html":"Preliminarily, simple and plane-strain compression tests were made with pure and commercial lead in order to determine their isotropy and work-hardening conditions. Strip-extrusion experiments were afterwards made with a sigmoidal die profile for the maximum reduction condition, and with a straight die profile with the sarne reduction and axial lenght. The resul ts were compare d with those predi cted by the sigmoidal profile theory and comparisons were made between the two types of profiles. The influences on the process of work-hardening, friction and granulometry were also verified.","abstract_has_math":false,"creators":["Danna, Francisco Luiz"],"institution":"Universidade Federal do Rio de Janeiro","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["De La Penha, Guilherme"],"committee_chairs":[],"committee_members":[],"year":1973,"date_issued":"1973-05","date_published":"1973-05","updated_at":"2026-07-24T01:16:01Z","subjects":["Extrusão","Mecânica dos sólidos"],"languages":["por"],"rights":["Acesso Aberto"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11422/3473","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["De La Penha, Guilherme"]},{"key":"dc:creator","label":"Author","values":["Danna, Francisco Luiz"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2018-01-15T13:16:43Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2026-05-16T03:04:28Z"]},{"key":"dc:date.issued","label":"Date","values":["1973-05"]},{"key":"dc:publisher","label":"Institution","values":["Universidade Federal do Rio de Janeiro"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia"]},{"key":"dc:type","label":"Dc Type","values":["Dissertação"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Extrusão","Mecânica dos sólidos"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["por"]},{"key":"dc:rights","label":"Dc Rights","values":["Acesso Aberto"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11422/3473"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Preliminarily, simple and plane-strain compression tests were made with pure and commercial lead in order to determine their isotropy and work-hardening conditions. Strip-extrusion experiments were afterwards made with a sigmoidal die profile for the maximum reduction condition, and with a straight die profile with the sarne reduction and axial lenght. The resul ts were compare d with those predi cted by the sigmoidal profile theory and comparisons were made between the two types of profiles. The influences on the process of work-hardening, friction and granulometry were also verified."]},{"key":"dc:title","label":"Title","values":["Ensaios de extrusão de barras entre matrizes de perfil sigmoidal"]}]}],"canonical_facts":{"dc:contributor.advisor":["De La Penha, Guilherme"],"dc:creator":["Danna, Francisco Luiz"],"dc:date.accessioned":["2018-01-15T13:16:43Z"],"dc:date.available":["2026-05-16T03:04:28Z"],"dc:date.issued":["1973-05"],"dc:description.abstract":["Preliminarily, simple and plane-strain compression tests were made with pure and commercial lead in order to determine their isotropy and work-hardening conditions. Strip-extrusion experiments were afterwards made with a sigmoidal die profile for the maximum reduction condition, and with a straight die profile with the sarne reduction and axial lenght. The resul ts were compare d with those predi cted by the sigmoidal profile theory and comparisons were made between the two types of profiles. The influences on the process of work-hardening, friction and granulometry were also verified."],"dc:identifier.uri":["http://hdl.handle.net/11422/3473"],"dc:language":["por"],"dc:publisher":["Universidade Federal do Rio de Janeiro"],"dc:publisher.department":["Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia"],"dc:rights":["Acesso Aberto"],"dc:subject":["Extrusão","Mecânica dos sólidos"],"dc:title":["Ensaios de extrusão de barras entre matrizes de perfil sigmoidal"],"dc:type":["Dissertação"]},"updated_at":"2026-07-24T01:16:01Z"}