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UID:0-326@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20190708T163000

DTEND;TZID=Asia/Jerusalem:20190708T173000

DTSTAMP:20230527T132331Z

URL:https://aerospace.technion.ac.il/events/instabilities-and-elastic-wave
 s-in-microstructured-soft-composites/

SUMMARY:Instabilities and Elastic Waves in Microstructured Soft Composites
DESCRIPTION:Lecturer:Jian Li\n Faculty:Department of Aerospace Engineering\
 n Institute:Technion – Israel Institute of Technology\n Location:Classro
 om 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract: \n D
 etails: \n Abstract:\nUnderstanding of the mechanical behavior of soft com
 posites is essential for many research fields and applications such as ult
 rasound diagnostics\, vibration mitigation\, adhesives\, packaging materia
 ls\, and biological tissues. The properties of soft composites can be tail
 ored through designing their microstructures. Moreover\, thanks to the abi
 lity of soft materials to sustain large deformations\, their behavior can 
 be tuned by deformations. Moreover\, large deformation induced elastic ins
 tabilities\, and associated dramatic structural and local material propert
 y changes\, can be utilized to design reconfigurable materials.\nIn this t
 alk\, we will start with examining elastic instability phenomena in variou
 s microstructured soft systems. We will first investigate the onset of ins
 tability in layered composites and 3D fiber composites. We will examine th
 e role of compressibility and fiber arrangement on the onset of instabilit
 y. Next\, we will discuss the domain formation and its transition to coope
 ratively wavy pattern via instabilities in soft particulate composites. We
  will show that these patterns can be tailored by altering the initial mic
 rostructural periodicity and concentration of the inclusions. Then\, we wi
 ll investigate the instability-induced pattern transformations in multipha
 se composites consisting of stiff inclusions and voids periodically distri
 buted in a soft matrix. Distinct patterns characterized by significantly d
 ifferent negative Poisson’s ratio (NPR) behaviors will be discussed\; mo
 reover\, we will show that the mechanical responses and auxetic behaviors 
 can also be tuned by inclusion distribution. Finally\, we will illustrate 
 an application of employing these reversible pattern transformations to ma
 nipulate elastic wave propagation.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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