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BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Penn Engineering Events - ECPv6.18.0//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Penn Engineering Events X-ORIGINAL-URL:https://seasevents.nmsdev7.com X-WR-CALDESC:Events for Penn Engineering Events REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20180311T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20181104T060000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20190310T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20191103T060000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20200308T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20201101T060000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/New_York:20191022T103000 DTEND;TZID=America/New_York:20191022T120000 DTSTAMP:20191002T133802Z CREATED:20191002T133802Z LAST-MODIFIED:20191002T133802Z UID:2089-1571740200-1571745600@seasevents.nmsdev7.com SUMMARY:MEAM Seminar: "Architecture in Biological Materials: A Template for Toughness Enhancement\, or a Siren Song?" DESCRIPTION:Structural biological materials\, such as animal bones and shells\, display remarkable mechanical properties despite being composed of quite simple and ordinary constituent materials. For example\, the toughness of nacre\, a structural biological material found in the shells of some mollusks\, is orders of magnitude higher than that of its primary constituent—the calcium based mineral aragonite. A number of structural biological materials that display toughness enhancement also possess a lamellar architecture consisting of alternating layers of ceramic and organic phases. It is believed that a structural biological material’s intricate architecture—the geometric arrangement of these phases—is responsible for the observed property enhancements. Within the bio-mimetics community\, there is currently great interest in reproducing these architectures in synthetic materials using micro-fabrication and 3D printing in order to achieve the property enhancements observed in structural biological materials. \nIn this talk I will present experimental and computational mechanics results that show that correctly identifying the connection between a structural biological material’s architecture and any property enhancements can be a very delicate process. Specifically\, I will present experiments that characterize the toughness properties of the skeletal elements of the marine sponge Euplectella aspergillum\, called spicules. I will show that despite possessing a lamellar architecture that is very similar to that seen in nacre\, the spicules do not display a significant toughness enhancement. Through mechanics modeling\, I argue that the spicule’s lamellar architecture is connected to their ability to bend more without failing\, i.e.\, to their strength\, rather than their toughness. These results serve as a reminder that any efforts aimed at reproducing a structural biological material’s architecture and property enhancements in synthetic materials should be prefaced by a careful investigation of the structural biological material itself. \nReferences \n[1] Monn\, Michael A.\, James C. Weaver\, Tianyang Zhang\, Joanna Aizenberg\, and\nHaneesh Kesari. “New functional insights into the internal architecture of the\nlaminated anchor spicules of Euplectella aspergillum.” Proceedings of the National\nAcademy of Sciences 112\, no. 16 (2015): 4976-4981. \n[2] Monn\, Michael A.\, and Haneesh Kesari. “A new structure-property connection in\nthe skeletal elements of the marine sponge Tethya aurantia that guards against\nbuckling instability.” Scientific reports 7 (2017): 39547. URL:https://seasevents.nmsdev7.com/event/meam-seminar-architecture-in-biological-materials-a-template-for-toughness-enhancement-or-a-siren-song/ LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu END:VEVENT END:VCALENDAR