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:20260427T122437Z 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\nInteractive livestream: https://cesnet.zoom.us/ j/94319936814?pwd=Y0pRL0FpWEhhQ1U4TzZGc2FDQVM4Zz09\nView-only livestream: https://www.youtube.com/channel/UCn9vmevniyXXLEr7VBp5cCQ\nLecture held in Room K3\, Faculty of Mathematics and Physics\, Charles University\, Sokol ovská 83 Prague 8..\n\nAbstract\nAxial prestretching can significantly a ffect the mechanical response of an inflated tube. This phenomenon is know n\, for example in the biomechanics of the cardiovascular system\, where a rteries\, if excised from a body\, manifest non-negligible shortening. It is clear that longitudinal prestretching leads to a reduction in the axial deformation that accompanies the pressure pulse transmitted through a tub e made of a material exhibiting large-strain stiffening. Somewhat surprisi ngly\, however\, longitudinal prestressing increases the arterial distensi bility and thus contributes to a higher relative volume that can be transm itted during the pressure pulse. It even appears that some material models \, such as the Gent strain energy density function\, have an axial strain inversion point at which the axial strain remains constant during pressuri zation while the relative volume is at its maximum. However\, due to age-r elated changes\, the value of the arterial axial prestretch decreases sign ificantly with age. Simulations considering nonlinear anisotropic material for the arterial wall show that even though this value decreases\, it sti ll has a beneficial effect on the value of circumferential distensibility. Similarly\, during the transition from elastic to viscoelastic behavior\, we observe that\, from the perspective of the thin-walled tube inflation problem\, the longitudinal prestretch is advantageous for the attainable v olume.\n LOCATION:https://researchseminars.org/talk/NSCM/206/ URL:https://cesnet.zoom.us/j/94319936814?pwd=Y0pRL0FpWEhhQ1U4TzZGc2FDQVM4Z z09 URL:https://www.youtube.com/channel/UCn9vmevniyXXLEr7VBp5cCQ END:VEVENT END:VCALENDAR