scholarly journals The Effect of Trabeculae Carneae on Left Ventricular Diastolic Compliance: Improvement in Compliance With Trabecular Cutting

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
David L. Halaney ◽  
Arnav Sanyal ◽  
Navid A. Nafissi ◽  
Daniel Escobedo ◽  
Martin Goros ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Human Heart ◽  
Wall Stress ◽  
Element Model ◽  
Left Ventricular ◽  
Finite Element Simulations ◽  
Fem Simulations ◽  
Diastolic Compliance

The role of trabeculae carneae in modulating left ventricular (LV) diastolic compliance remains unclear. The objective of this study was to determine the contribution of trabeculae carneae to the LV diastolic compliance. LV pressure–volume compliance curves were measured in six human heart explants from patients with LV hypertrophy at baseline and following trabecular cutting. The effect of trabecular cutting was also analyzed with finite-element model (FEM) simulations. Our results demonstrated that LV compliance improved after trabecular cutting (p < 0.001). Finite-element simulations further demonstrated that stiffer trabeculae reduce LV compliance further, and that the presence of trabeculae reduced the wall stress in the apex. In conclusion, we demonstrate that integrity of the LV and trabeculae is important to maintain LV stiffness and loss in trabeculae leads to more LV compliance.

Identification Scheme to Assess the Role of Interfacial Damage in a Hemp-Starch Biocomposite

2014 ◽  
Vol 875-877 ◽  
pp. 524-528
Author(s):  
Sofiane Guessasma ◽  
Mohameden Hbib ◽  
David Bassir
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Precise Determination ◽  
Mechanical Parameters ◽  
Interfacial Damage ◽  
Failure Properties ◽  
Experimental Response

This paper aims at studying the effect of interfacial damage on the mechanical behavior of starch - hemp composite. The procedure encompasses an experimental investigation towards the determination of microstructural features and mechanical testing of the material. A finite element model is developed to account for a particular damage kinetics that triggers failure properties. Our results show that the experimental evidence of interfacial damage driven failure is achieved. Finite element model is able to capture this feature using an abrupt damage criterion. But in order to identify the observed behavior, the experimental response is matched with the numerical one. This process tunes the mechanical parameters to fit the experimental response. The optimization process conducted in this way leads to a precise determination of the mechanical parameters that quantifies the observed ultimate properties.

scholarly journals The Role of the Finite Element Model in Dental Implants

2000 ◽  
Vol 26 (2) ◽  
pp. 77-81 ◽  
Author(s):  
Daniel H. DeTolla ◽  
Sebastiano Andreana ◽  
Abani Patra ◽  
Robert Buhite ◽  
Brandon Comella
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dental Implants ◽  
Element Model ◽  
The Finite Element Model

Influence Of Microgravity On Left Ventricular Sphericity: A Finite Element Model Of The Heart

2012 ◽  
Author(s):  
Richard Summers ◽  
Weston Smith ◽  
Ryan Gilbrech ◽  
Jun Liao ◽  
Benjamin Weed ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Left Ventricular

A Three-Dimenstional Nonlinear Finite Element Model of Lumbar Intervertebral Joint in Torsion

1987 ◽  
Vol 109 (3) ◽  
pp. 200-209 ◽  
Author(s):  
K. Ueno ◽  
Y. K. Liu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Stress Distributions ◽  
Cause Of Failure ◽  
Disk Prolapse ◽  
Nonlinear Finite Element Model

Torsion as a cause of failure in the lumbar intervertebral joint was studied using a three-dimensional nonlinear finite element model. The role of facets and ligaments as well as the stress distributions in the posterior elements, the disk, the ligaments, and the vertebral body were examined. For physiological range of torsion, the facets carried 10 to 40 percent of the torque. The fiber stresses in the disk were the highest at the lateral margin of the outer layer of the annulus. Therefore, torsion itself is unlikely to cause posterior or posterolateral disk prolapse.

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