{"id":4471,"date":"2016-06-28T12:22:29","date_gmt":"2016-06-28T16:22:29","guid":{"rendered":"https:\/\/engineering.jhu.edu\/magazine-archive\/?p=4471"},"modified":"2016-06-28T12:22:29","modified_gmt":"2016-06-28T16:22:29","slug":"blocking-the-bounce","status":"publish","type":"post","link":"https:\/\/engineering.jhu.edu\/magazine-archive\/2016\/06\/blocking-the-bounce\/","title":{"rendered":"Blocking the Bounce"},"content":{"rendered":"

\"Photo<\/a>When a rubber ball or block falls to the floor, it bounces.<\/p>\n

Yet, recently, an architected rubber block made by mechanical engineer<\/a> Sung Hoon Kang<\/a> sat motionless when dropped.<\/p>\n

The block\u2019s lack of movement inspired Kang and his colleagues to further investigate the potential to alter energy absorption in architected materials. To do so, the team used computational modeling to determine the design elements of prototypes. A 3-D printer then interpreted the code to generate physical prototypes for testing.<\/p>\n

After a couple of months, they hit on a winning formula\u2014a new class of energy-absorbing materials, described in Advanced Materials by Kang, an assistant professor in the Hopkins Extreme Materials Institute; doctoral student Lichen Fang; and colleagues at Harvard.<\/p>\n

Energy-absorbing materials are used widely for safety and protection purposes\u2014for instance, to lessen the effects of a car crash or to safeguard fragile items in a shipped package. But existing energy-absorbing materials have shortcomings: Their performance degrades after use and\/or they often rely on a specific load rate to absorb energy.<\/p>\n

The new class of materials offers a viable solution. \u201cThe energy-trapping mechanism is reversible and repeatable,\u201d Kang explains. \u201cIt\u2019s also highly scalable, customizable, and independent of rate and loading history\u201d\u2014opening the door to many practical applications, from reusable car bumpers to better safety helmets.<\/p>\n","protected":false},"excerpt":{"rendered":"

When a rubber ball or block falls to the floor, it bounces. Yet, recently, an architected rubber block made by mechanical engineer Sung Hoon Kang sat motionless when dropped. The block\u2019s lack of movement inspired Kang and his colleagues to further investigate the potential to alter energy absorption in architected materials. To do so, the…<\/p>\n","protected":false},"author":4,"featured_media":4638,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[24],"tags":[156,399,400],"class_list":["post-4471","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-impact","tag-department-of-mechanical-engineering","tag-sung-hoon-kang","tag-architected-materials","issue-summer-2016"],"acf":[],"yoast_head":"\nBlocking the Bounce - JHU Engineering Magazine<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/engineering.jhu.edu\/magazine-archive\/2016\/06\/blocking-the-bounce\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Blocking the Bounce - JHU Engineering Magazine\" \/>\n<meta property=\"og:description\" content=\"When a rubber ball or block falls to the floor, it bounces. 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