Hybrid-Mixed Stress Finite Element Models for the Physically Non-Linear Analysis of Concrete Three-Dimensional Structures

2010 ◽  
Author(s):  
C.S.R. Garrido ◽  
L.M.S.S. Castro
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Linear Analysis ◽  
Finite Element Models ◽  
Non Linear

Non-linear 3D Evaluation of Different Oral Implant-Abutment Connections

2012 ◽  
Vol 91 (12) ◽  
pp. 1184-1189 ◽  
Author(s):  
P. Streckbein ◽  
R.G. Streckbein ◽  
J.F. Wilbrand ◽  
C.Y. Malik ◽  
H. Schaaf ◽  
...  
Keyword(s):  
Finite Element ◽  
Cone Angle ◽  
Three Dimensional ◽  
Bone Strain ◽  
Finite Element Models ◽  
Implant Abutment ◽  
Non Linear ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Micro-gaps and osseous overload in the implant-abutment connection are the most common causes of peri-implant bone resorption and implant failure. These undesirable events can be visualized on standardized three-dimensional finite element models and by radiographic methods. The present study investigated the influence of 7 available implant systems (Ankylos, Astra, Bego, Brånemark, Camlog, Straumann, and Xive) with different implant-abutment connections on bone overload and the appearance of micro-gaps in vitro. The individual geometries of the implants were transferred to three-dimensional finite element models. In a non-linear analysis considering the pre-loading of the occlusion screw, friction between the implant and abutment, the influence of the cone angle on bone strain, and the appearance of micro-gaps were determined. Increased bone strains were correlated with small (< 15°) cone angles. Conical implant-abutment connections efficiently avoided micro-gaps but had a negative effect on peri-implant bone strain. Bone strain was reduced in implants with greater wall thickness (Ankylos) or a smaller cone angle (Bego). The results of our in silico study provide a solid basis for the reduction of peri-implant bone strain and micro-gaps in the implant-abutment connection to improve long-term stability.

Non-Linear Analysis of Energy Absorption Systems Under Impact Loads Through FEM

2011 ◽  
Author(s):  
E. R. Ledesma-Orozco ◽  
J. A. Diosdado-De la Pen˜a ◽  
G. I. Pe´rez–Soto ◽  
A. Salazar-Garibay ◽  
J. F. Reveles-Arredondo ◽  
...  
Keyword(s):  
Finite Element ◽  
Energy Absorption ◽  
Linear Analysis ◽  
Finite Element Models ◽  
Impact Loads ◽  
Absorption System ◽  
Polystyrene Foam ◽  
Non Linear ◽  
The Impact ◽  
Bistable Structures

This paper presents the non-linear simulation of the impact on a structure with different energy absorption systems using finite element models. A comparison of the damage caused to the structure in case of impact without implementing energy absorption system, and implementing energy absorption systems based on bistable structures, polystyrene foam and aluminium foam are shown here in. The results demonstrate the advantages of using energy absorption systems on structures under impact loads.

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