{"id":3521,"date":"2012-06-22T15:29:07","date_gmt":"2012-06-22T15:29:07","guid":{"rendered":"http:\/\/www.compositestoday.com\/?p=3521"},"modified":"2012-06-22T15:35:13","modified_gmt":"2012-06-22T15:35:13","slug":"paper-details-use-of-natural-material-cork-for-quiet-sandwich-composites","status":"publish","type":"post","link":"https:\/\/www.compositestoday.com\/2012\/06\/paper-details-use-of-natural-material-cork-for-quiet-sandwich-composites\/","title":{"rendered":"Paper Details Use of Cork for Quiet Sandwich Composites"},"content":{"rendered":"<p><img data-recalc-dims=\"1\" decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-3522\" title=\"Put A Cork in It\" src=\"https:\/\/i0.wp.com\/www.compositestoday.com\/wp-content\/uploads\/2012\/06\/MechEngineering_061412_012.jpg?resize=600%2C399\" alt=\"\" width=\"600\" height=\"399\" srcset=\"https:\/\/i0.wp.com\/www.compositestoday.com\/wp-content\/uploads\/2012\/06\/MechEngineering_061412_012.jpg?w=600&amp;ssl=1 600w, https:\/\/i0.wp.com\/www.compositestoday.com\/wp-content\/uploads\/2012\/06\/MechEngineering_061412_012.jpg?resize=300%2C199&amp;ssl=1 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><noscript><img data-recalc-dims=\"1\" decoding=\"async\" class=\"aligncenter size-full wp-image-3522\" title=\"Put A Cork in It\" src=\"https:\/\/i0.wp.com\/www.compositestoday.com\/wp-content\/uploads\/2012\/06\/MechEngineering_061412_012.jpg?resize=600%2C399\" alt=\"\" width=\"600\" height=\"399\" srcset=\"https:\/\/i0.wp.com\/www.compositestoday.com\/wp-content\/uploads\/2012\/06\/MechEngineering_061412_012.jpg?w=600&amp;ssl=1 600w, https:\/\/i0.wp.com\/www.compositestoday.com\/wp-content\/uploads\/2012\/06\/MechEngineering_061412_012.jpg?resize=300%2C199&amp;ssl=1 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/noscript><br \/>\n<em><strong>This is a guest post written by <a href=\"http:\/\/www.ce.udel.edu\/directories\/profiles\/kukich.htm\">Diane Kukich<\/a> at the <a href=\"http:\/\/www.udel.edu\/\">University of Delaware<\/a><\/strong><\/em><\/p>\n<p>Cork, known for its use in such low-tech applications as wine bottle stoppers and bulletin boards, now shows promise as the core material in composite sandwich structures for use in high-tech automotive, aircraft and energy applications.<\/p>\n<p>A research team at the University of Delaware is investigating this natural material as an environmentally friendly solution for quiet sandwich composites. They recently published a paper on the work in Scientific Reports, an online, open-access research publication from the publishers of Nature that covers all areas of the natural sciences.<\/p>\n<p>Jonghwan Suhr, assistant professor in the Department of Mechanical Engineering and an affiliated faculty member in the Center for Composite Materials says;<\/p>\n<blockquote><p>Cork is a natural product with intriguing properties it\u2019s energy absorbing, tough, lightweight and impact resistant, and it has excellent vibrational and acoustic damping properties. Its unique cellular arrangement also results in good thermal properties, and it\u2019s impermeable to moisture.<\/p><\/blockquote>\n<p>Suhr was adviser to the lead author on the paper, James Sargianis, who completed his master\u2019s degree in mechanical engineering at UD in May. The third member of the team was Hyung-ick Kim, a postdoctoral researcher at CCM who is an expert in mechanical characterization of advanced materials.<\/p>\n<p>Sargianis\u2019s graduate research focused on exploring natural material-based sandwich composites with enhanced noise mitigation. Cork turned out to be one of the most promising alternatives to traditional sandwich structures.<\/p>\n<p>Suhr explains that composite sandwich structures \u2014 typically made from synthetic foam cores or honeycomb materials bonded to carbon-epoxy face sheets \u2014 are commonly used in aerospace applications because they offer high bending stiffness and are very lightweight. However, he says, they are also good at radiating noise, which is not a desirable feature in an airplane. The current solution is to line the interior with four to six inches of glass fabric, but this increases weight and reduces space inside the cabin.<\/p>\n<p>Enter cork as the new core for the sandwich. In the recently reported study, the researchers compared sandwich structures made from a natural cork agglomerate core with those using a core made from a high-quality synthetic foam called Rohacell. Carbon-epoxy was used as the face sheet material with both cores.<\/p>\n<blockquote><p>We achieved a 250 percent improvement in damping performance using the cork-based materials, with no sacrifice in mechanical properties, further, cork radiates little to no noise and is inexpensive. It\u2019s also sustainable and environmentally friendly because there are no carbon emissions associated with its production.<\/p><\/blockquote>\n<p>Since the paper was published in May, the team has been approached by Portugal-based Amorim, a world leader in the production of thermal and acoustic insulation materials based on natural raw cork.<\/p>\n<p>Suhr sees the potential for application of cork-based sandwich structures in not only aircraft cabins but also car engine mounts, launch vehicle fairings, and wind turbine blades.<\/p>\n<p>In the next phase of the project, the team will investigate the low-velocity impact of these materials.<\/p>\n<p>Sargianis, who also earned his bachelor\u2019s degree at UD, in 2010, has accepted a position with the Naval Air Systems Command (NAVAIR) in Lakehurst, N.J. He took first-place honors at the 2012 SAMPE National Student Research Symposium in May for his work on natural material based-sandwich composites.<\/p>\n<p>[rssless]photo by: Evan Krape[\/rssless]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is a guest post written by Diane Kukich at the University of Delaware Cork, known for its use in such low-tech applications as wine bottle stoppers and bulletin boards, now shows promise as the core material in composite sandwich structures for use in high-tech automotive, aircraft and energy applications. A research team at the University of Delaware is investigating this natural material as an environmentally friendly solution for quiet sandwich composites. They recently published a paper on the work [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3522,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[458,302,512],"tags":[514,110],"class_list":["post-3521","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guest-posts","category-innovations","category-composites-news","tag-udel","tag-usa"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Paper Details Use of Cork for Quiet Sandwich Composites<\/title>\n<meta name=\"description\" content=\"Cork, known for its use in 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