Computational Analysis of Resistance to Alveolar Bone Resorption of Osseointegrated Implant

Dental implant failure started with a resorption on alveolar crest. Resorption occurred if the stress is greater than the strength threshold (ultimate strength). Bones carrying mechanical loads adapt their strength to the load applied on it by bone modelling or remodelling; by apposition or destruction depends on internal stress level distributed on the bones. This research was conducted using FEM on a CBCT image of model which were implanted and converted into computerized 3D finite element digital model. The model was given material properties, fixed support, and being simulated on occlusal loads of 87 N and friction loads of 29 N for 0,7 seconds.Maximum princip al loads on alveolar bone of implant model was 41 Mpa and still below the ultimate strength (69 MPa). Based on the stress level above, it may be concluded that alveolar bone on implant model has good resistance towards resorption.

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Pavement Damage Due to Conventional and New Generation of Wide-Base Super Single Tires

Tire Science and Technology ◽

10.2346/1.2174344 ◽

2005 ◽

Vol 33 (4) ◽

pp. 210-226 ◽

Cited By ~ 6

Author(s):

I. L. Al-Qadi ◽

M. A. Elseifi ◽

P. J. Yoo ◽

I. Janajreh

Keyword(s):

Carrying Capacity ◽

Material Properties ◽

Three Dimensional ◽

Fe Analysis ◽

Load Carrying Capacity ◽

Inflation Pressure ◽

3D Finite Element ◽

Load Carrying ◽

Pavement Damage ◽

New Generation

Abstract The objective of this study was to quantify pavement damage due to a conventional (385/65R22.5) and a new generation of wide-base (445/50R22.5) tires using three-dimensional (3D) finite element (FE) analysis. The investigated new generation of wide-base tires has wider treads and greater load-carrying capacity than the conventional wide-base tire. In addition, the contact patch is less sensitive to loading and is especially designed to operate at 690kPa inflation pressure at 121km/hr speed for full load of 151kN tandem axle. The developed FE models simulated the tread sizes and applicable contact pressure for each tread and utilized laboratory-measured pavement material properties. In addition, the models were calibrated and properly validated using field-measured stresses and strains. Comparison was established between the two wide-base tire types and the dual-tire assembly. Results indicated that the 445/50R22.5 wide-base tire would cause more fatigue damage, approximately the same rutting damage and less surface-initiated top-down cracking than the conventional dual-tire assembly. On the other hand, the conventional 385/65R22.5 wide-base tire, which was introduced more than two decades ago, caused the most damage.

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Analysis and design of thermo-mechanical interfaces

Bulletin of the Polish Academy of Sciences Technical Sciences ◽

10.2478/v10175-012-0027-4 ◽

2012 ◽

Vol 60 (2) ◽

pp. 205-213

Author(s):

K. Dems ◽

Z. Mróz

Keyword(s):

Optimality Conditions ◽

Mechanical Loading ◽

Material Properties ◽

Structural Response ◽

External Boundary ◽

Mechanical Loads ◽

Internal Interface ◽

Analysis And Design ◽

First Order ◽

Mechanical Nature

Abstract. An elastic structure subjected to thermal and mechanical loading with prescribed external boundary and varying internal interface is considered. The different thermal and mechanical nature of this interface is discussed, since the interface form and its properties affect strongly the structural response. The first-order sensitivities of an arbitrary thermal and mechanical behavioral functional with respect to shape and material properties of the interface are derived using the direct or adjoint approaches. Next the relevant optimality conditions are formulated. Some examples illustrate the applicability of proposed approach to control the structural response due to applied thermal and mechanical loads.

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Numerical Study of the Effect of Geometry and Boundary Conditions on the Collapse Behaviour of Stocky Stiffened Panels

10.3940/rina.ijme.2012.a2.221 ◽

2012 ◽

Vol 154 (A2) ◽

Keyword(s):

Finite Element ◽

Boundary Conditions ◽

Ultimate Strength ◽

Material Properties ◽

Finite Element Modelling ◽

Numerical Study ◽

Fe Analysis ◽

Stiffened Panels ◽

Element Modelling ◽

Geometric Configurations

This study aims at studying different configurations of the stiffened panels in order to identify robust configurations that would not be much sensitive to the imprecision in boundary conditions that can exist in experimental set ups. A numerical study is conducted to analyze the influence of the stiffener’s geometry and boundary conditions on the ultimate strength of stiffened panels under uniaxial compression. The stiffened panels with different combinations of mechanical material properties and geometric configurations are considered. The four types of stiffened panels analysed are made of mild or high tensile steel and have bar, ‘L’ and ‘U’ stiffeners. To understand the effect of finite element modelling on the ultimate strength of the stiffened panels, four types of FE models are investigated in FE analysis including 3 bays, 1/2+1+1/2 bays, 1+1 bays and 1 bay with different boundary conditions.

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Thermoelastic Dynamic Behaviors of a FGM Hollow Cylinder Under Non-Axisymmetric Thermo-Mechanical Loads

Journal of Mechanics ◽

10.1017/jmech.2012.112 ◽

2012 ◽

Vol 29 (1) ◽

pp. 109-120 ◽

Cited By ~ 6

Author(s):

H. Xie ◽

H.-L. Dai ◽

Y.-N. Rao

Keyword(s):

Hollow Cylinder ◽

Material Properties ◽

Radial Direction ◽

Volume Fraction ◽

Functionally Graded ◽

Dynamic Responses ◽

Two Dimensional ◽

Governing Equations ◽

Mechanical Loads ◽

Temperature Boundary

AbstractThis paper is concerned with two-dimensional (r, θ) thermoelastic dynamic responses of a long functionally graded hollow cylinder subjected to asysmmetrical thermal and mechanical loads. The material properties, except the Poisson's ratio, are assumed to be temperature independent and vary exponentially and continuously in the radial direction. By means of finite difference method and Newmark method, the motion governing equations of the long FGM hollow cylinder are solved. Comparisons between this paper's results and the corresponding analytical results validate the proposed solution. In addition, the effects of the volume fraction, temperature boundary conditions on the hollow cylinder's deformations and stresses distributions are examined, and many other valuable thermoelastic dynamic characteristics are revealed.

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Influence of alveolar bone height on stress distribution of endodontically treated teeth with post: A 3D finite element analysis

Journal of Pierre Fauchard Academy (India Section) ◽

10.1016/j.jpfa.2015.02.004 ◽

2015 ◽

Vol 29 (1) ◽

pp. 5-10

Author(s):

S. Vijay Singh ◽

I.K. Pandit ◽

Saurabh Gupta ◽

Aruna Vijay Singh ◽

Harsha Satija

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Stress Distribution ◽

Alveolar Bone ◽

Endodontically Treated Teeth ◽

Element Analysis ◽

3D Finite Element ◽

3D Finite Element Analysis ◽

Bone Height

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INVESTIGATION OF ULTIMATE STRENGTH OF CES COLUMNS CONSIDERING MATERIAL PROPERTIES

Journal of Structural and Construction Engineering (Transactions of AIJ) ◽

10.3130/aijs.75.2231 ◽

2010 ◽

Vol 75 (658) ◽

pp. 2231-2237 ◽

Cited By ~ 1

Author(s):

Toshiaki FUJIMOTO ◽

Hiroshi KURAMOTO ◽

Tomoya MATSUI ◽

Hiroshi KOMATSU

Keyword(s):

Ultimate Strength ◽

Material Properties

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Strong and Weak Formulations of a Mixed Higher-Order Shear Deformation Theory for the Static Analysis of Functionally Graded Beams under Thermo-Mechanical Loads

Journal of Composites Science ◽

10.3390/jcs4040158 ◽

2020 ◽

Vol 4 (4) ◽

pp. 158 ◽

Cited By ~ 1

Author(s):

Chih-Ping Wu ◽

Zhan-Rong Xu

Keyword(s):

Boundary Conditions ◽

Shear Deformation ◽

Static Analysis ◽

Material Properties ◽

Deformation Theory ◽

Shear Deformation Theory ◽

Functionally Graded ◽

Mechanical Loads ◽

Effective Material Properties ◽

Fg Beam

The strong and weak formulations of a mixed layer-wise (LW) higher-order shear deformation theory (HSDT) are developed for the static analysis of functionally graded (FG) beams under various boundary conditions subjected to thermo-mechanical loads. The material properties of the FG beam are assumed to obey a power-law distribution of the volume fractions of the constituents through the thickness of the FG beam, for which the effective material properties are estimated using the rule of mixtures, or it is directly assumed that the effective material properties of the FG beam obey an exponential function distribution along the thickness direction of the FG beam. The results shown in the numerical examples indicate that the mixed LW HSDT solutions for elastic and thermal field variables are in excellent agreement with the accurate solutions available in the literature. A parametric study related to various effects on the coupled thermo-mechanical behavior of FG beams is carried out, including the aspect ratio, the material-property gradient index, and different boundary conditions.

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