Composite Solutions for Deck Catamarans

2018 ◽  
Vol 55 (1) ◽  
pp. 1-4
Author(s):  
Elena Felicia Beznea ◽  
Ionel Chirica ◽  
Adrian Presura ◽  
Ionel Iacob
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sandwich Structure ◽  
High Strength ◽  
Total Weight ◽  
External Loading ◽  
Strength Analysis ◽  
Allowable Stress ◽  
The Finite Element Method ◽  
Inland Navigation

The paper is treating the strength analysis of the main deck structure of an inland navigation catamaran for 30 passengers. The main deck should have high stiffness and high strength to resist to external loading and endure high stresses from combined bending and torsion loads. Different materials for sandwich structure of the deck have been analysed by using the Finite Element Method in order to determine the solution which accomplish better designing criteria regarding allowable stress and deformations and total weight.

An Application of Finite-Element Method To The Deformation Analysis of Coated Plain-Weave Fabrics

1982 ◽  
Vol 11 (4) ◽  
pp. 310-327
Author(s):  
H. Irokazu ◽  
M. Inami ◽  
Yoshio Nakahara
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Uniaxial Stress ◽  
Deformation Analysis ◽  
Strength Analysis ◽  
The Finite Element Method ◽  
Membrane Structures ◽  
Plain Weave ◽  
Weave Fabric ◽  
Element Method

Methods for analysing coated plain-weave fabric which has properties of nonlinear elasticity have not yet been satisfactorily developed. In this paper, a method which is promis ing for use in engineering applications like the strength analysis of membrane structures is presented. The finite element method using a rectangular element consisting of plain-weave fabric and coating material which is assumed to be an isotropic elastic plate of plane stress is applied to the method. Verification of the me thod is made by using uniaxial stress-strain responses. A square piece of coated plain-weave fabric with a square hole in it is analyzed as an example of application of the present method. Key Words: coated plain-weave fabrics; finite element method; nonlinearly elastic biaxial response; geometrically nonlinear prob lem ; incremental approach.

scholarly journals Structural geometries and mechanical properties of vertebral implant with honeycomb sandwich structure for vertebral compression fractures: a finite element analysis

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Yuan Guo ◽  
Jing Liu ◽  
Xushu Zhang ◽  
Zejun Xing ◽  
Weiyi Chen ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sandwich Structure ◽  
Sandwich Structures ◽  
Peak Stress ◽  
Axial Deformation ◽  
The Finite Element Method ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Structure ◽  
Anterior Posterior

Abstract Background Because of osteoporosis, traffic accidents, falling from high places, and other reasons, the vertebral body can be compressed and even collapse. Vertebral implants can be used for clinical treatment. Because of the advantages of honeycomb sandwich structures, such as low cost, less material, light weight, high strength, and good cushioning performance. In this paper, the honeycomb sandwich structure was used as the basic structure of vertebral implants. Methods The orthogonal experiment method is applied to analyse the size effect of honeycomb sandwich structures by the finite element method. Based on the minimum requirements of three indexes of peak stress, axial deformation, and anterior–posterior deformation, the optimal structure size was determined. Furthermore, through local optimization of the overall structure of the implant, a better honeycomb sandwich structure vertebral implant was designed. Results The optimal structure size combination was determined as a panel thickness of 1 mm, wall thickness if 0.49 mm, cell side length of 1 mm, and height of 6 mm. Through local optimization, the peak stress was further reduced, the overall stress distribution was uniform, and the deformation was reduced. The optimized peak stress decreased to 1.041 MPa, the axial deformation was 0.1110%, and the anterior–posterior deformation was 0.0145%. A vertebral implant with good mechanical performance was designed. Conclusions This paper is the first to investigate vertebral implants with honeycomb sandwich structures. The design and analysis of the vertebral implant with a honeycomb sandwich structure were processed by the finite element method. This research can provide a feasible way to analyse and design clinical implants based on biomechanical principles.

scholarly journals STRENGTH ANALYSIS OF VARIABLE RIGIDITY SLABS ON ELASTIC SUPPORT WITH VARIABLE SUBGRADE RATIO

2019 ◽  
pp. 201-208
Author(s):  
E. V. Barmekova
Keyword(s):  
Differential Equation ◽  
Finite Element Method ◽  
Finite Element ◽  
Elastic Support ◽  
Strength Analysis ◽  
The Finite Element Method ◽  
Variable Rigidity ◽  
Different Thickness ◽  
Element Method

The paper presents the strength analysis of variable rigidity slabs on elastic support with the variable subgrade ratio. The analysis is based on a solution of the differential equation of the slab flexure using the finite element method. The results are obtained for different slabs on the elastic support. The results are presented for the different thickness of the upper layer of the two-layer slab on the elastic support with the variable subgrade ratio.

Dynamics of a 3D Micropolar Beam Model

2014 ◽  
Author(s):  
Soroosh Hassanpour ◽  
G. R. Heppler
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Equations ◽  
External Loading ◽  
Beam Model ◽  
The Finite Element Method ◽  
Numerical Examples ◽  
3D Space ◽  
Different Types ◽  
Modal Behavior

The development of a simplified micropolar beam model is presented and the governing dynamic equations for a micropolar beam deforming in 3D space, under different types of external loading and boundary conditions are derived. The dynamic equations are derived from Hamilton’s principle and the finite element method is used to provide numerical examples. The modal behavior of the developed micropolar beam model and the conditions under which the results of classical beam models will be recovered are presented.

scholarly journals Strength Analysis of a Steel Structure of Weights Boxes by Means of Simulation Computations

2017 ◽  
Vol 8 (1) ◽  
pp. 11-19
Author(s):  
Miroslav Blatnický ◽  
Ján Dižo ◽  
Stasys Steišūnas
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Total Mass ◽  
Mass Measurement ◽  
Steel Structure ◽  
Theory Of Elasticity ◽  
The Other ◽  
Strength Analysis ◽  
The Finite Element Method ◽  
Welded Steel

Abstract In this article the strength analyses of weights boxes are presented. Boxes are designed as a welded steel structure at which weights with total mass almost ten tons are stored in them. These boxes are an integral part of a mechanism intended for calibration of the mass measurement device. The article contains on one hand the basic scope of the theory of elasticity and strength analysis and on the other hand the numerical computations of the structure by using the Finite Element Method. Based on results the structure of weights boxes was modified in order to satisfy the defined safety factor.

Strength Analysis on Crankshaft Structure Parameters

2011 ◽  
Vol 204-210 ◽  
pp. 332-336
Author(s):  
Tao Chi ◽  
Zhong Fu Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Experimental Design ◽  
Experimental Method ◽  
Strength Analysis ◽  
Transition Strength ◽  
Structure Parameters ◽  
The Finite Element Method ◽  
Design And Optimization ◽  
The Impact

In order to evaluate the impact of crankshaft structure parameters on the transition strength of main journal and crank arm, this paper takes the crankshaft of V8 engine as the research object, using the finite element method to analyze, and then processing the experimental results with orthogonal experimental method throughout the experimental design, with the crankshaft parameters’ significant analysis of the crank arm overlap degree, main journal diameter, main journal length, crank pin diameter, crank pin length, etc, to obtain their impacts on the strength, and provide the instructive recommendations of crankshaft design and optimization.

scholarly journals Design and strength analysis of C-hook for load using the finite element method

2020 ◽  
Vol 313 ◽  
pp. 00034
Author(s):  
Pavol Lengvarský ◽  
Martin Mantič ◽  
Róbert Huňady
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Strength Analysis ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Deformation State ◽  
The Finite Element Analysis ◽  
Stress And Deformation ◽  
The Stability

The special type of C-hook is investigated in this paper. The C-hook is designed to carry a special load, where is not possible to use classical hooks or chain slings. The designed hook is consisted of two arms that ensure the stability of the load being carried. The finite element analysis is performed for the control of the stress and deformation state in the whole hook. The fatigue analysis is performed for the check of a lifetime of C-hook.

ASSESSMENT OF THE BIOMECHANICAL COMPATIBILITY OF AN INTERSPINOUS IMPLANT FOR "DYNAMIC STABILIZATION" THROUGH THE FINITE ELEMENT METHOD

2005 ◽  
Vol 05 (02) ◽  
pp. 375-382 ◽  
Author(s):  
R. CONTRO ◽  
P. VENA ◽  
D. GASTALDI ◽  
G. FRANZOSO
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Sagittal Plane ◽  
Compressive Force ◽  
Dynamic Stabilization ◽  
Strength Analysis ◽  
The Finite Element Method ◽  
Biomechanical Compatibility ◽  
Healthy State ◽  
Element Method

The paper addresses the biomechanical compatibility of an interspinous implant used for "dynamic stabilization" of a diseased intervertebral disc. A comparison between the behaviour of a titanium alloy ( Ti 6 Al 4 V ) implant and that of a superelastic alloy ( Ni - Ti ) implant has been carried out. The assessment of the biomechanical compatibility was achieved by means of the finite element method, in which suitably implemented constitutive laws for the materials have been used. The L4–L5 lumbar system in healthy state has been assumed as target for a biomechanically compatible implant. The L4–L5 system with the interspinous implant subjected to compressive force and bending moments has been simulated. A strength analysis for the bearing bone tissue in the posterior processes was also carried out. The results have shown that both implants were able to decrease the force on the apophyseal joints; however, the titanium-based implant exhibited a low biomechanical compatibility under extension-flexion in the sagittal plane; whereas the Ni - Ti exhibited a higher compatibility.

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