{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,3]],"date-time":"2026-05-03T09:57:03Z","timestamp":1777802223578,"version":"3.51.4"},"reference-count":35,"publisher":"SAGE Publications","issue":"4","license":[{"start":{"date-parts":[[2018,7,17]],"date-time":"2018-07-17T00:00:00Z","timestamp":1531785600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Journal of Composite Materials"],"published-print":{"date-parts":[[2019,2]]},"abstract":"<jats:p>The specific characteristics of composite materials, like carbon fibre-reinforced plastics, have been leading to their rising importance and widespread use. As these parts are normally produced in a near-net shape, secondary operations, like drilling, are necessary prior to their assembly in complex structures. It is still difficult to define a machining process that enables free-damage holes, due to the peculiar laminar nature of these materials. So, the definition of a drilling process that minimizes delamination and increases reliability in produced parts is combined with satisfactory cost and productivity is still of major importance in the composites manufacturing industry. In this paper, two sets of unidirectional coupons from plates with carbon fibre as reinforcement and epoxy resin as matrix are drilled using five different drilling tool strategies and two feed rates for uneven damage extension. One of the strategies is the use of a pre-drilling option. Then the delamination is assessed using enhanced radiography and, finally, three diverse mechanical tests are performed on the resulting coupons: three-point bending, four-point bending and pin bearing. The results allowed establishing and modelling, with the help of statistical tools, the relations between the damaged area caused by drilling and the material\u2019s mechanical resistance. The three-point bending resistance does not vary greatly with the damage area. On the other hand, the bearing resistance and the four-point bending resistance decrease with the increase of the damaged area.<\/jats:p>","DOI":"10.1177\/0021998318787855","type":"journal-article","created":{"date-parts":[[2018,7,17]],"date-time":"2018-07-17T03:25:51Z","timestamp":1531797951000},"page":"547-560","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":8,"title":["Analysis of damage outcome in the strength of polymer composite materials"],"prefix":"10.1177","volume":"53","author":[{"given":"Pedro","family":"Silva","sequence":"first","affiliation":[{"name":"School of Engineering, Polytechnic of Porto (ISEP), Portugal"}]},{"given":"Jo\u00e3o E","family":"Matos","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio Engenharia Matem\u00e1tica (LEMA), School of Engineering, Polytechnic of Porto (ISEP), Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0002-5836","authenticated-orcid":false,"given":"Lu\u00eds MP","family":"Dur\u00e3o","sequence":"additional","affiliation":[{"name":"School of Engineering, Polytechnic of Porto (ISEP), Portugal"},{"name":"Centro de Investiga\u00e7\u00e3o e Desenvolvimento em Engenharia Mec\u00e2nica (CIDEM), School of Engineering, Polytechnic of Porto (ISEP), Portugal"}]}],"member":"179","published-online":{"date-parts":[[2018,7,17]]},"reference":[{"key":"bibr1-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/S1359-835X(96)00106-6"},{"key":"bibr2-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1177\/002199839703100404"},{"key":"bibr3-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compstruct.2016.12.007"},{"key":"bibr4-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compstruct.2015.08.020"},{"key":"bibr5-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.jmatprotec.2005.06.039"},{"key":"bibr6-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compositesa.2015.02.008"},{"key":"bibr7-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1177\/0731684407083012"},{"key":"bibr8-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1177\/0021998314532668"},{"key":"bibr9-0021998318787855","unstructured":"Klocke F, Koenig W, Rummenhoeller S, et\u00a0al. Milling of advanced composites. In: Jahanmir S, Ramulu M and Koshy P (eds)\n                      Machining of ceramics and composites\n                      . New York: Marcel Dekker, 1998, pp.249\u2013266."},{"key":"bibr10-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compstruct.2013.05.033"},{"key":"bibr11-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compstruct.2017.04.003"},{"key":"bibr12-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compstruct.2017.02.079"},{"key":"bibr13-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/S1359-835X(00)00069-5"},{"key":"bibr14-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijmachtools.2005.10.004"},{"key":"bibr15-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compstruct.2009.10.035"},{"key":"bibr16-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1177\/0021998311421690"},{"key":"bibr17-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijmachtools.2016.08.006"},{"key":"bibr18-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compstruct.2016.08.004"},{"key":"bibr19-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijmachtools.2005.01.015"},{"key":"bibr20-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1177\/0021998308092205"},{"key":"bibr21-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compositesa.2009.11.006"},{"key":"bibr22-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compositesa.2017.02.024"},{"key":"bibr23-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compstruct.2017.06.043"},{"key":"bibr24-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1115\/1.2899580"},{"key":"bibr25-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compstruct.2011.11.024"},{"key":"bibr26-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1080\/09243046.2014.928966"},{"key":"bibr27-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.procir.2016.02.255"},{"key":"bibr28-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.compositesa.2006.05.004"},{"key":"bibr29-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1163\/156855111X610208"},{"key":"bibr30-0021998318787855","unstructured":"Karumbaiah KM, Kracke C, Battley M, et\u00a0al. Flexural damage assessment of carbon-epoxy composites with and without resin flow channels. In:\n                      21st international conference on composite materials\n                      , Xi\u2019an, China, 20\u201325 August 2017."},{"key":"bibr31-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/j.proeng.2016.06.647"},{"key":"bibr32-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1016\/S0890-6955(03)00127-5"},{"key":"bibr33-0021998318787855","unstructured":"Mehta M, Reinhart TJ and Soni AH. Effect of fastener hole drilling anomalies on structural integrity of PMR-15\/Gr composite laminates. In:\n                      Proceedings of the Machining Composite Materials Symposium\n                      , ASM Materials Week, Chicago, IL, USA, 1\u20135 November 1992, pp.113\u2013126."},{"key":"bibr34-0021998318787855","unstructured":"ISO 14125: 1998 (Rev 2013).\n                      Fibre-reinforced plastic composites \u2013 Determination of flexural properties\n                      . Switzerland: International Organization for Standardization, 2013."},{"key":"bibr35-0021998318787855","doi-asserted-by":"publisher","DOI":"10.1177\/002199839603001201"}],"container-title":["Journal of Composite Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/0021998318787855","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/0021998318787855","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/0021998318787855","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T20:32:13Z","timestamp":1777494733000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/0021998318787855"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,7,17]]},"references-count":35,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2019,2]]}},"alternative-id":["10.1177\/0021998318787855"],"URL":"https:\/\/doi.org\/10.1177\/0021998318787855","relation":{},"ISSN":["0021-9983","1530-793X"],"issn-type":[{"value":"0021-9983","type":"print"},{"value":"1530-793X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2018,7,17]]}}}