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Photo by flazingo_photos

Photo by flazingo_photos

Photo by flazingo_photos

Photo by NCReedplayer

Photo by anieto2k

Photo by Thomas Hawk

Photo by ed_needs_a_bicycle

Photo by Robert S. Donovan

Photo by Rubén Díaz Alonso

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Destaque

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sana

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The nonlinear interaction of an aortic heart valve composed of hyper elastic corrugated leaflets of finite density attached to a stent subjected to various pressures under physiological flow conditions is analysed. Stent graft is designed to seal tightly with artery above and below the aneurysm. Over time, blood pressure and other factors can cause this weak area to bulge like a balloon and it can eventually enlarge and rupture. Anatomy of aorta has been studied to understand the blood flow inside a stented blood vessel. Two main constituents of an artery are elastin and collogen which has high deformations and high force resistance capability. Shear rates in large arteries (aorta) are typically large enough to assume that the blood involved in a first approach behaves as a Newtonian fluid. Thus, blood flow is governed by the Navier—Stokes equations considering residual pressure. Atomic Force Microscopic (AFM) experiment has been conducted to find the mechanical properties of endothelium cells of human and mouse.During the development and progression of aneurysmal or occlusive atherosclerotic disease, the arterial wall may weaken to the point where the local stress exceeds the local strength, in which case tearing or rupture of part or all of the wall will occur. In the case of the carotid arteries, plaque rupture can lead to stroke.The wall shear stress conditions including mean, peak and oscillations of shear stress are the most substantial hemodynamic factors in locating atherosclerotic in mammalian arteries. A Finite Element Model of a cross section of a stented aorta has been developed on ANSYS 11 in which constant and time varying blood flow was simulated. The results explained the Von Mises Stress distribution and deformation in the model due to physiological pressure waveform and different mechanical properties. Study contributes to the improvement of vascular procedures by determining the maximum force of deployment for stents, during their implantation by surgeons. Observations derived from the simulations such as elastic modulus affects on deformations ,viscoelastic parameters and stress, strain offer the possibility of providing clinical useful diagnostic therapeutic information which currently can’t be obtained by an ultrasonic imaging.

Numerical Simulation of Stented Aorta

Numerical Simulation of Stented Aorta

Numerical Simulation of Stented Aorta

Phillips Course Sheets

Phillips Course Sheets

Phillips Course Sheets

Claire Phillips

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Summer Camps: Turning Brain Drain Into Brain Gain

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Claire Phillips

2. scaffolds amd ladders

2. scaffolds amd ladders

2. scaffolds amd ladders

In this project we studied dynamic loading behaviour of different models of portal frame which are subjected to moving mass on top of horizontal beam. A finite element simulation has been carried out in order to study the behaviour of a transverse open crack in the horizontal segment of a portal frame while it is subjected to a moving mass. This portal frame is hinged to the ground and only in-plane vibrations are considered. The horizontal section is modelled as two segments connected by a rotational mass-less linear elastic spring. Portal frames are modelled using the C-coding. The characteristic equation is obtained with due consideration towards boundary and compatibility conditions. The resulting characteristic equation is a function of the frames natural frequency, crack location and crack depth. The frequency values are used to decide the appropriate time step for the dynamic analysis. The finite element modelling has been done with singular quadratic quadrilateral planar elements. Results are mainly used to calculate crack opening, crack closing and crack growth rate time. Various conclusive inferences have been made from the results obtained. The output solutions such as stress, strain and displacement was studied and discussed.

Report v1

Destaque (12)

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Numerical Simulation of Stented Aorta

Numerical Simulation of Stented Aorta

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Phillips Course Sheets

Phillips Course Sheets

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My last vacations

My last vacations

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Summer Camps: Turning Brain Drain Into Brain Gain

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2. scaffolds amd ladders

2. scaffolds amd ladders

2. scaffolds amd ladders

Report v1

Career

1. Photo by flazingo_photos

2. Photo by flazingo_photos

3. Photo by flazingo_photos

4. Photo by NCReedplayer

5. Photo by anieto2k

6. Photo by Thomas Hawk

7. Photo by ed_needs_a_bicycle

8. Photo by Robert S. Donovan

9. Photo by Rubén Díaz Alonso

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