BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Lukáš Horný (Faculty of Mechanical Engineering\, CTU Prague) DTSTART:20260427T134000Z DTEND:20260427T151000Z DTSTAMP:20260517T232537Z UID:NSCM/206 DESCRIPTION:Title: M echanics of nonlinearly elastic tubes: Effect of axial prestretching and c onsequences for the biomechanics of human arteries\nby Lukáš Horný (Faculty of Mechanical Engineering\, CTU Prague) as part of Nečas Seminar on Continuum Mechanics\n\nLecture held in Room K3\, Faculty of Mathemati cs and Physics\, Charles University\, Sokolovská 83 Prague 8..\n\nAbstra ct\nAxial prestretching can significantly affect the mechanical response o f an inflated tube. This phenomenon is known\, for example in the biomecha nics of the cardiovascular system\, where arteries\, if excised from a bod y\, manifest non-negligible shortening. It is clear that longitudinal pres tretching leads to a reduction in the axial deformation that accompanies t he pressure pulse transmitted through a tube made of a material exhibiting large-strain stiffening. Somewhat surprisingly\, however\, longitudinal p restressing increases the arterial distensibility and thus contributes to a higher relative volume that can be transmitted during the pressure pulse . It even appears that some material models\, such as the Gent strain ener gy density function\, have an axial strain inversion point at which the ax ial strain remains constant during pressurization while the relative volum e is at its maximum. However\, due to age-related changes\, the value of t he arterial axial prestretch decreases significantly with age. Simulations considering nonlinear anisotropic material for the arterial wall show tha t even though this value decreases\, it still has a beneficial effect on t he value of circumferential distensibility. Similarly\, during the transit ion from elastic to viscoelastic behavior\, we observe that\, from the per spective of the thin-walled tube inflation problem\, the longitudinal pres tretch is advantageous for the attainable volume.\n LOCATION:https://researchseminars.org/talk/NSCM/206/ END:VEVENT END:VCALENDAR