BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Penn Engineering Events - ECPv6.17.0//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Penn Engineering Events
X-ORIGINAL-URL:https://events.engineering.upenn.edu
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:20250309T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20251102T060000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20260308T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20261101T060000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20270314T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20271107T060000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260605T100000
DTEND;TZID=America/New_York:20260605T110000
DTSTAMP:20260514T132913Z
CREATED:20260514T132913Z
LAST-MODIFIED:20260514T132913Z
UID:16418-1780653600-1780657200@events.engineering.upenn.edu
SUMMARY:MEAM Seminar: "Fracture of Lattice Materials from Low to High Relative Density"
DESCRIPTION:Lattice materials\, a class of architected material\, demonstrate a broad range of mechanical behaviors enabled by the design of their internal geometry and selection of their constituent material. At low relative densities (where the ratio between lattice and base material density is less than 0.3)\, lattices exhibit high specific toughness compared to traditional engineering materials\, and their fracture mechanics are well-understood. However\, at relative densities above 0.3\, classical lattice fracture models become inaccurate as the stress state in each ligament is no longer accurately captured by simple beam models. As a result\, lattice fracture behavior remains less explored in this regime despite a predicted increase in toughness. In this talk\, I will discuss the transition in fracture behavior of triangular and hexagonal lattices from low to high relative density\, first through a new experimental approach for testing 2D architected materials\, then using theoretical and computational modeling of elastic-brittle and elastic-plastic lattices. The results demonstrate that stress concentrations located at the lattice nodes play a significant role in determining failure at high densities and depend on the local geometry at the crack tip\, including the lattice relative orientation and fillet radius. Furthermore\, material plasticity is shown to enhance toughness by softening stress concentrations and dissipating energy near the crack tip\, while also revealing certain geometries with fracture toughness that exceeds that of the base material.
URL:https://events.engineering.upenn.edu/event/meam-seminar-fracture-of-lattice-materials-from-low-to-high-relative-density/
LOCATION:Room 337\, Towne Building\, 220 South 33rd Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar,Doctoral
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
END:VCALENDAR