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UID:0-348@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20181121T163000

DTEND;TZID=Asia/Jerusalem:20181121T173000

DTSTAMP:20230527T135108Z

URL:https://aerospace.technion.ac.il/events/soft-biological-tissues-penetr
 ation-mechanics/

SUMMARY:Soft Biological Tissues Penetration Mechanics
DESCRIPTION:Lecturer:Maor Shoshan\n Faculty:Department of Aerospace Enginee
 ring\n Institute:Technion – Israel Institute of Technology\n Location:Cl
 assroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract:
  \n Details: \n Recent progress in experimental biomechanics has provided 
 reliable hyperelastic constitutive parameters for a variety of soft biolog
 ical tissues like brain\, kidney and liver. These laboratory verified stra
 in energy functions enable accurate analytical and numerical evaluation of
  complicated mechanical response of soft bio tissues\, at large strains. A
 dvances in diagnosis\, numerical simulation and design of medical procedur
 es have followed accordingly. In particular\, research of soft tissues bal
 listic impact phenomena (perforation and penetration) is now within the fr
 amework of nonlinear continuum mechanics. This development stands in marke
 d contrast to earlier studies\, performed over decades\, where substitute 
 materials like ballistic soap or ballistic gelatin were used to assess the
  resistance of bio tissues to ballistic impact.\nThe present work aims at 
 deriving a basic theory of the mechanics of deep penetration of rigid proj
 ectiles into soft tissues. The study centers on the cavitation model which
  has been successfully employed in solid targets penetration analysis. The
  underlying assumptions are rigid point headed projectiles\, normal impact
  at small firearms velocity range and straight penetration path. Material 
 behaviour is hyperelastic\, isotropic and incompressible\, with simple fai
 lure criteria. Inertia effects are accounted for and both spherical and cy
 lindrical patterns are considered.\nWe start with a brief historical revie
 w of soft tissues penetration mechanics (hyperelastic material behavior an
 d cavity expansion method)\, discussing several open questions which have 
 motivated the present work. New elegant solutions for steady state cavitat
 ion fields will be presented next\, including derivation of several formul
 ae for the cavitation pressure.\nWe shall examine sensitivities of the cav
 itation pressure to material parameters (type of tissue)\, failure criteri
 a and presence of material inertia. Also discussed is the difference betwe
 en spherical and cylindrical cavitation patterns. Finally\, assuming that 
 tissue resisting force applied on the projectile is given essentially by t
 he cavitation pressure\, we shall estimate the penetration depth and compa
 re with available experimental data.\nAs not much work of similar nature h
 as been done\, possible limitations of the present results will be discuss
 ed along with suggestions for future research.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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