Design and optimisation of the external load bearing carry through structure of a columned multi bubble fuselage

2013 ◽  
Vol 117 (1187) ◽  
pp. 97-108
Author(s):  
S. H. Cho ◽  
C. Bil ◽  
R. Adams
Keyword(s):  
Finite Element ◽  
Structural Design ◽  
Membrane Structure ◽  
Finite Element Models ◽  
Design Domain ◽  
Inner Membrane ◽  
And Topology ◽  
Bending Loads ◽  
Design Challenge ◽  
The Given

Abstract The blended wing-body configuration holds a major structural design challenge at the centre-body where the structure must support both wing bending loads and internal cabin pressure. A membrane approach is proposed which decouples the loads to allow their resistance by two independent structures: an inner membrane for cabin pressure and an outer structure to resist wing loads. A columned multi-bubble fuselage is proposed for the inner membrane structure, which are multispherical configuration to efficiently withstand the pressure loads. Considering this configuration, the carry-through structure can be designed and optimised. Finite element results show a significant reduction of stress level in this design over that for a conventional multi-bubble fuselage. Up to 30% weight reduction is achieved for a military cargo application that requires an extensive area with no structural interruption. For the outer carry-through structure, the topology and shape optimisations of finite element models were performed on the given design domain. The results from the shape and topology optimisations were complementary demonstrating a consistent design approach. The optimisation theory is briefly presented along with the results.

Numerical Investigation on Behaviors of Stiffened Large Suction Cap for Offshore Suction Cofferdam

2020 ◽  
Author(s):  
Jeongsoo Kim ◽  
Yeon-Ju Jeong ◽  
Min-Su Park ◽  
Sunghoon Song
Keyword(s):  
Finite Element ◽  
Structural Design ◽  
Nonlinear Finite Element ◽  
Finite Element Models ◽  
Suction Pressure ◽  
Sheet Pile ◽  
Large Size ◽  
Critical Issues ◽  
Stress And Deformation ◽  
Pile Type

Abstract This study introduces a large offshore cofferdam installed by suction, unlike conventional ones such as a sheet-pile type, and proposes an effective suction cap for the cofferdam. In structural design view of the cofferdam, there are several critical issues due to its large size. This study conducted structural analyses of stiffened caps for large offshore suction cofferdam using fully nonlinear finite element models, and analyzed changes in behaviors of the cap due to stiffener arrangements to provide design insights. For finite element models, the diameter and the thickness of the suction cap (circular plate only) are 20m and 0.07m, respectively. Suction pressure on the cap was assumed to be 100kPa, all parts of the cofferdam except the cap are considered as boundary conditions. By investigating conventional suction anchors, several stiffener arrangement patterns on the cap of suction cofferdam were derived, and each arrangement was estimated by comparing stress and deformation of the cap. Also, reaction distributions on the edge of the cap were investigated to analyze effects of the stiffener arrangement on the interface behaviors between cap and cofferdam.

scholarly journals Finite Element Analysis of Miniplate for Post-Fracture Finger Rehabilitation Device

2020 ◽  
Vol 2 (1) ◽  
pp. 21-26
Author(s):  
Nanang Qosim ◽  
Ratna Monasari ◽  
Zakki F. Emzain ◽  
Lutfi Hakim ◽  
Ali Sai’in
Keyword(s):  
Finite Element ◽  
Critical Concentration ◽  
Von Mises Stress ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Alloy Material ◽  
Bending Loads ◽  
Von Mises ◽  
The Given ◽  
Stress And Strain Distribution

Miniplate plays an important role as one of the implant components used as a rehabilitation device for a post-fracture finger. In this study, an analysis was carried out to determine the strength of the miniplate design made from Ti-6Al-4V titanium alloy material. Simulation and analysis were carried out using the finite element method. The given input for modeling tensile and bending loads determined von Mises stress, kinetic energy, strain energy, and internal energy. The analysis showed that uneven von Mises stress and strain distribution have occurred. The critical concentration of stresses was located at the center of the miniplate and these values were a lot lower than the yield stress of Ti-6Al-4V.

Analysis and topology optimization structural design excavator bucket tooth using finite element method

2020 ◽  
Author(s):  
Sumar Hadi Suryo ◽  
Wijdan Muhammad Fawwaz ◽  
Yogi Adi Wijaya ◽  
Eko Wahyu Saputro ◽  
Harto
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Topology Optimization ◽  
Structural Design ◽  
Excavator Bucket ◽  
And Topology ◽  
Element Method

scholarly journals DYNAMIC BEHAVIOUR OF SANDWICH PLATE WITH DIFFERENT CORE CONFIGURATION UNDER ACTION OF IMPULSIVE LOADING

2019 ◽  
Vol 18 (4) ◽  
pp. 506-526
Author(s):  
Ammar M Nemah ◽  
Hatem H Obied
Keyword(s):  
Finite Element ◽  
Sandwich Plate ◽  
Dynamic Properties ◽  
Time History ◽  
Impulsive Loading ◽  
Von Mises Stress ◽  
Finite Element Models ◽  
Out Of Plane ◽  
Bending Loads ◽  
Von Mises

Steel sandwich structures with honeycomb and corrugated cellular cores have demonstrated the capability of supporting significant static bending loads while also enabling effective mitigation of impulse loads, the main objectives to use these structures is weight reduction and isolate or reduce the deflection and stress. This research aims to study the effect of dynamic load on the dynamic properties of various types of sandwich cores then find the best model that withstand high stresses and dissipate loads with less mass was possible. The studied model of sandwich is of dimensions (500x500x100) mm with five cells. Four types of steel sandwich plate (SSP) finite element models of various core types have been created: (1) triangle corrugated core, (2) trapezoid corrugated core, (3) square honeycomb and (4) out-of plane hexagonal honeycomb, the mass of various types was constant with value of 13.75 kg. The SSP types were compared by using ANSYS (15.0) APDL software.The finite element models are examined under the effect of transient concentrated stepped load of (350N) during 10ms. The time history response showed that the minimum von-Mises stress and minimum deflection occur at triangle corrugated SSP with values of stress (12.5Mpa) and deflection (3.8 ), but in energy absorption the square honeycomb is the best type with reduction of stress (99.65%) and reduction of deflection of (98.95%).

scholarly journals Replacing Detonation by Compressed Balloon Approaches in Finite Element Models

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Pierre Legrand ◽  
S. Kerampran ◽  
M. Arrigoni
Keyword(s):  
Finite Element ◽  
Energy Balance ◽  
Structural Design ◽  
Ideal Gas ◽  
Finite Element Models ◽  
Arbitrary Lagrangian Eulerian ◽  
Detonation Products ◽  
Blast Effects ◽  
Blast Wave Propagation ◽  
Explosive Event

The evaluation of blast effects from malicious or accidental detonation of an explosive device is really challenging especially on large buildings. Indeed, the time and space scales of the explosion together with the chemical reactions and fluid mechanics make the numerical model really difficult to achieve acceptable structural design. Nevertheless, finite element methods and especially Arbitrary Lagrangian Eulerian (ALE) have been extensively used in the past few decades with some simplifications. Among them, the replacement of the explosive event by a compressed balloon of detonation products has been proven useful in numerous different situations. Unfortunately, the ALE algorithm does not achieve a proper energy balance through the numerical integration of the discrete scheme; this important drawback is not compensated by the use of the classical compressed balloon approach. The paper focuses on increasing the radius of the equivalent ideal gas balloon in order to achieve better energy balance and thus better results at later stages of the blast wave propagation.

Structural Design Process Improvement Using Evolutionary Finite Element Models

2006 ◽  
Vol 43 (1) ◽  
pp. 172-181 ◽  
Author(s):  
Robert M. Taylor ◽  
Terrence A. Weisshaar ◽  
Vladimir Sarukhanov
Keyword(s):  
Finite Element ◽  
Design Process ◽  
Process Improvement ◽  
Structural Design ◽  
Finite Element Models
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