scholarly journals Design finite element method based models of floating dry docks strength

2021 ◽  
pp. 43-52
Author(s):  
Anatoly Mironov ◽  
Dmitry Y. Titko
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Elastic Base ◽  
Beam Model ◽  
Buoyant Force ◽  
Dry Dock ◽  
Global Strength ◽  
Element Method

The features of global strength modelling of floating dry docks using finite element method are considered. Comparative analysis of two- and three-dimensional models was performed considering the interaction of the floating dry dock and the ship. To solve the problem of reducing the complexity of creating and the size of the finite element model, it is proposed to use the elements of a volumetric orthotropic body to model the main transverse beams of the pontoon. Hydrostatic elastic base of floating dry dock is represented as spring elements. The model of the dock support device includes spring and gap elements. The vessel is considered in the equivalent beam model. Results were obtained on such effects as redistribution of buoyant force due to deformation of the dock, incomplete inclusion of the towers in the general longitudinal bending of the dock, the effect of ship stiffness not only on the longitudinal, but also on the transverse bending of the dock.

The Finite Element Method: A Tool to Evaluate Shear Bond Strength of Dental Bracket

2014 ◽  
Vol 984-985 ◽  
pp. 431-437
Author(s):  
Vijaykumar Hiremath ◽  
Girija Bidarimath ◽  
Basavaraj Endigeri
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Model ◽  
Testing Machine ◽  
Three Dimensional ◽  
Element Model ◽  
Loading Conditions ◽  
Acceptable Error ◽  
Three Dimensional Finite Element ◽  
Element Method

In this paper finite element model of steel dental bracket is generated along with bonding agent, enamel & stress analysis is carried out on the bracket for different loading conditions. Three dimensional finite element model developed are constrained with boundary condition that resembles to the reality. The Vonmisses stress is recorded for each loading conditions and compared with experimental results. The experimental work for 60 samples were carried out on Universal testing machine at material testing laboratory, Basaveshwar Engineering College, Bagalkot. It is found from FEM results that the shear bonding strength for different loadings from 60 N to 80 N varies from 7.276 N/mm2 to 9.7N/mm2, which are closer to experimental values with acceptable error. The study reveals that Finite Element Method can be used as a strong tool to analyze the dental bracket and study different parameters to improve its performance and to avoid time and cost required for experimentation.

scholarly journals Three-Dimensional Simulation of Scalp Soft Tissue Expansion Using Finite Element Method

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Qiu Guan ◽  
Xiaochen Du ◽  
Yan Shao ◽  
Lili Lin ◽  
Shengyong Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Soft Tissue ◽  
Three Dimensional ◽  
Tissue Expansion ◽  
Element Model ◽  
Size Number ◽  
Proposed Model ◽  
Dimensional Simulation ◽  
Element Method

Scalp soft tissue expansion is one of the key medical techniques to generate new skin tissue for correcting various abnormalities and defects of skin in plastic surgery. Therefore, it is very important to work out the appropriate approach to evaluate the increase of expanded scalp area and to predict the shape, size, number, and placement of the expander. A novel method using finite element model is proposed to solve large deformation of scalp expansion in this paper. And the procedure to implement the scalp tissue expansion with finite element method is also described in detail. The three-dimensional simulation results show that the proposed method is effective, and the analysis of simulation experiment shows that the volume and area of the expansion scalp can be accurately calculated and the quantity, location, and size of the expander can also be predicted successfully with the proposed model.

Fatigue Crack Propagation Simulation of Rubber Shock Absorbers

2011 ◽  
Vol 415-417 ◽  
pp. 2298-2303
Author(s):  
Jing Yu Zhai ◽  
Ying Yang ◽  
Qing Kai Han
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Crack ◽  
Crack Growth ◽  
Shock Absorber ◽  
Three Dimensional ◽  
Element Model ◽  
Initial Crack ◽  
Shock Absorbers ◽  
Element Method

Rubber shock absorbers are the key parts to isolate vibrations of the machinery and equipment. In this paper, a three dimensional finite element model of a rubber shock absorber is established; then the computation of three dimensional fatigue crack growth rates are discussed by using the nonlinear finite element method. The stress distribution which can determine the initial crack location and the possible risk surface under dynamic loads is obtained. The three dimensional crack growth is simulated by using finite element method and linear elastic fracture mechanics. A brittle fracture process of the rubber shock absorber along the dangerous surface is simulated by using the cohesive element of ABAQUS.

Comparison of Bending Stress of a Helical Gear for Different Materials and Modules Using AGMA Standards in FEA

2013 ◽  
Vol 376 ◽  
pp. 423-427 ◽  
Author(s):  
S. Prabhakaran ◽  
S. Ramachandran
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Power Transmission ◽  
Three Dimensional ◽  
Element Model ◽  
Element Analysis ◽  
Helical Gears ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Element Method

Gearing is one of the most critical components in mechanical power transmission systems.. This paper explains about the comparison of the geometry of Helical gears for two different modules by modeling and mathematical equations, load distribution at various positions of the contact line and the stress analysis of Helical gears using three-dimensional finite element method. The bending stresses were examined using three-dimensional finite element model.. These stresses of different modules obtained from the finite element analysis were compared and the considerable reduction of weight occurred was found and also the values are compared with the theoretical values. Both results agree very well. This indicates that the finite element method model is accurate.

Fitting Analysis of Soil Strength Parameter Based on the Finite Element Method

2012 ◽  
Vol 204-208 ◽  
pp. 382-388
Author(s):  
Bin Yang ◽  
Li Ying Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Internal Force ◽  
Soil Strength ◽  
Structure Design ◽  
Strength Parameter ◽  
Navigation Lock ◽  
Element Method

Abstract: This paper takes the project of the navigation lock in Jialing River as an example to study the lock head structure design layout, and build up a three-dimensional finite element model and carry on the nonlinear numerical calculations by using large finite software ABAQUS, and calculating the structural internal force of the lock head by the 3D nonlinear finite element method. This paper utilizes the numerical analysis method to analyze soil strength parameters. Combining with the FEM calculation data, the data-fit between the influencing factors and the side piers’ stress and displacement was found. This provides new thoughts to analyze the influence of multivariate interaction on the lock head structure.

scholarly journals Exploring three-dimensional edge-based smoothed finite element method based on polyhedral mesh to study elastic mechanics problems

2021 ◽  
Vol 39 (4) ◽  
pp. 747-752
Author(s):  
Jian Yang ◽  
Wei Xie ◽  
Zhiwei Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Relative Error ◽  
Three Dimensional ◽  
Beam Model ◽  
Hexahedral Elements ◽  
Smoothed Finite Element Method ◽  
Polyhedral Mesh ◽  
Edge Based ◽  
Element Method

This paper established the three-dimensional edge-based smoothed finite element method(ES-FEM) based on polyhedral mesh, divided the smoothed domain, constructed the shape function and derived the geometric matrix and the stiffness matrix. The MATLAB software was used to prepare the corresponding computing programs, with which the paper studied the stress distribution of a hollow sphere model and a beam model under different numbers of polyhedral elements. The paper compared the calculation results from the conventional finite element methods(FEM) that use tetrahedral elements and hexahedral elements respectively in terms of stress relative error and energy relative error. The comparison results show that the three-dimensional ES-FEM based on polyhedral mesh has better precision and convergence than the conventional FEM and better adaptability to complex geometric structures.

scholarly journals The Partitioned Mixed Model of Finite Element Method and Interface Stress Element Method with Arbitrary Shape of Discrete Block Element

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Zhang Qing ◽  
Zhuo Jiashou ◽  
Xia Xiaozhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Arbitrary Shape ◽  
Mixed Model ◽  
Three Dimensional ◽  
Element Model ◽  
Interface Stress ◽  
Interface Element ◽  
Spring Element ◽  
Element Method

Based on the model of rigid-spring element suitable for homogeneous elastic problem, which was developed by Japanese professor Kawai, the interface stress element model (ISEM) for solving the problem of discontinuous media mechanics has been established. Compared with the traditional finite element method (FEM), the ISEM is more accurate and applicable. But the total number of freedom degree of ISEM in dealing with three-dimensional problems is higher than that of FEM, which often brings about the reduction on efficiency of calculation. Therefore, it is necessary to establish a mixed model by gathering the advantages of ISEM and FEM together. By making use of the good compatibility of ISEM and introducing the concept of transitional interface element, this paper combines ISEM and FEM and proposes a mixed model of ISEM-FEM which can solve, to a large extent, the contradictions between accuracy and efficiency of calculation. In addition, using natural coordinate, algorithm of ISEM for block elements of arbitrary shape has been performed. Numerical examples show that the method proposed in this paper is feasible and its accuracy is satisfactory.

A Finite Element Model of the Proximal Sesamoid Bones of the Horse Under Different Loading Conditions

1994 ◽  
Vol 07 (01) ◽  
pp. 35-39 ◽  
Author(s):  
T. K. Cheung ◽  
K. N. Thompson
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Metacarpophalangeal Joint ◽  
Distal Portion ◽  
Principal Stresses ◽  
Sesamoid Bones ◽  
Stress Patterns ◽  
Element Method

SummaryFracture of the proximal sesamoid bones is a common injury of racing horses, usually resulting from over-dorsiflexion of the metacarpophalangeal joint. The purpose of this study was to develop a computer-aided method utilizing stereo-radiography, computed tomography, and finite element method to determine three-dimensional stress distribution in the proximal sesamoid bones during metacarpophalangeal joint dorsiflexion. The stress pattern was characterized by a compressive component on the articular part of the bone and a tensile component on the non-articular part of the bone. Maximum principal stresses were 2.5, 9.1 and 15.5 MPa and minimum principal stresses were -1.9, -9. 2 and -14. 9 MPa for metacarpophalangeal joint angles of 140°, 125° and 110°, respectively. The distal portion of the articular part of the bone experienced the largest compressive stress. In this study changes in the orientation and magnitude of the ligament force vectors did not significantly change stress patterns of the proximal sesamoid bone.This study was designed to determine stress patterns of the proximal sesamoid bones in horses. Stress patterns were determined by finite element method analysis. Compressive stresses were present on the articular side, and tensile stresses were present on the nonarticular side of the bones. The magnitude of load applied to the bone did not appreciably change the pattern of stresses.

Static and Dynamic Burst Analysis of Cylindrical Shells

2006 ◽  
Author(s):  
Liping Xue ◽  
Cunjiang Cheng ◽  
G. E. O. Widera ◽  
Zhifu Sang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cylindrical Shell ◽  
Three Dimensional ◽  
Element Model ◽  
Computer Code ◽  
Material Behavior ◽  
Burst Pressure ◽  
Implicit Methods ◽  
Element Method

The purpose of this paper is to determine whether the finite element method can be employed to accurately predict the burst pressure of a specific cylindrical shell subjected to internal pressure. Both static and dynamic analyses were carried out. The computer code ANSYS is employed to perform a static, nonlinear analysis (both geometry of deformation and material behavior) using three-dimensional 20 node structural solid elements. The “Newton-Raphson Method” (N-R method) and the “Arc-Length Method”, are both employed to solve the nonlinear equations. The finite element code LS-DYNA is used to generate a three-dimensional finite element model by use of eight-node brick elements for the dynamic analysis. Both explicit and implicit methods are used to simulate the dynamic response of cylinders. A comparison with various empirical equations shows that both static and dynamic finite element method simulations can be employed with sufficient accuracy to predict the burst pressure of a specific cylindrical shell.

scholarly journals Experimental Study and Calculation of a Three-Dimensional Finite Element Model of Infiltration in Drainage Asphalt Pavement

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3909
Author(s):  
Qingsong Zhang ◽  
Tianjian Ji ◽  
Zhanqi Wang ◽  
Lei Xiao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Asphalt Pavement ◽  
Three Dimensional ◽  
Element Model ◽  
Calculation Model ◽  
Driving Safety ◽  
Longitudinal Slope ◽  
Drainage Capacity ◽  
Element Method

Drainage asphalt pavement provides excellent drainage performance and driving safety, where the permeability of the pavement is the critical performance. When analyzing the permeability of drainage asphalt pavements, the previously used two-dimensional infiltration calculation model with boundary conditions deviates from the real situation. In this article, a three-dimensional infiltration finite element method was proposed to evaluate the permeability of pavement, and the feasibility of the three-dimensional infiltration finite element method to evaluate the drainage capacity of drainage asphalt pavement was verified by using the single-sided permeability test of indoor rutted slabs of drainage asphalt mixtures as an example. Finally, the effects of the longitudinal slope of the pavement on the drainage performance of the drained asphalt pavement was investigated by calculations based on the three-dimensional infiltration finite element method. The results indicated that: when the longitudinal slope was less than 6%, the influence of longitudinal slope size on the drainage capacity of drainage asphalt pavement was very small. When the gradient of the longitudinal slope from 0 to 6%, the critical drainage capacity of the pavement corresponding to each cross slope was maintained at a relatively stable value.

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