Strength analysis of ship shaped structures subjected to asymmetrical bending moment

2015 ◽  
pp. 429-438 ◽  
Keyword(s):  
Bending Moment ◽  
Strength Analysis ◽  
Asymmetrical Bending

scholarly journals Aerodynamic Design and Strength Analysis of the Wing for the Purpose of Assessing the Influence of the Bell-Shaped Lift Distribution

Aerospace ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 13
Author(s):  
Pavel Hospodář ◽  
Armand Drábek ◽  
Aleš Prachař
Keyword(s):  
Structural Design ◽  
Bending Moment ◽  
Strength Analysis ◽  
Flight Performance ◽  
Fuel Saving ◽  
Reduce Fuel Consumption ◽  
Aerodynamic Design ◽  
Structural Part ◽  
Optimization Loop ◽  
Good Agreement

This article deals with aerodynamic and structural calculations of several wing designs to compare the influence of the shape on the lift distribution. Various shapes of wings for the required lift and bending moment were optimized to minimize drag and thereby reduce fuel consumption. One example was a wing with a bell-shaped lift distribution, which was proposed by Ludwig Prandtl and has been forgotten over the years. The first part of the paper focuses on minimization of the wing drag coefficient by a low fidelity method and the results are compared with the CFD calculation with good agreement. In the structural part of the analysis, the inner layout of the studied wings was designed. The structural design, containing elementary wing components and optimization loop, was carried out to minimize weight with respect to panel buckling. From these calculations the weights of wings were obtained and compared. In the last part of this study, an analysis of flight performance of an airplane with presented wings was performed for a selected flight mission. Results indicated that, for the free optimized wing, the fuel saving was about six percent.

Corrosion-Dependent Ultimate Strength Assessment of Aged Box Girders Based on Experimental Results

2011 ◽  
Vol 55 (04) ◽  
pp. 289-300 ◽  
Author(s):  
S. Saad-Eldeen ◽  
Y. Garbatov ◽  
C. Guedes Soares
Keyword(s):  
Service Life ◽  
Residual Stresses ◽  
Ultimate Strength ◽  
Bending Moment ◽  
Experimental Results ◽  
Time Dependent ◽  
Strength Analysis ◽  
Box Girders ◽  
Strength Assessment ◽  
Equivalent Time

This paper presents a corrosion-dependent analysis of the ultimate strength analysis of aged box girders based on experimental results. Three multispan corroded stiffened box girders subjected to four-point vertical load are analyzed, idealizing the behavior of midship sections of full ships. The specimens have three levels of corrosion. Two corrosion-dependent formulas for assessing the ultimate strength as well as the ultimate bending moment of corroded structures are proposed. Using a time-dependent corrosion growth model, equivalent time-dependent formulations are developed. The effect of corrosion degradation on the residual stresses during the service life is also analyzed, and a regression equation for predicting the remaining residual stresses along the service life is proposed. Finally, a corrosion-dependent moment-curvature relationship has been developed accounting for the changes in geometrical characteristics and material properties of the tested box girders.

Material Mechanical Performance about Worm Bending and Twisting Deformation for Civil Engineering

2012 ◽  
Vol 568 ◽  
pp. 187-190
Author(s):  
Xu Qin Chen ◽  
Gui Lan Jiang ◽  
Guang Zhen Cheng
Keyword(s):  
Civil Engineering ◽  
Mechanical Performance ◽  
Superposition Principle ◽  
Vertical Plane ◽  
Bending Moment ◽  
Small Deformation ◽  
Internal Force ◽  
Drive Shaft ◽  
Strength Analysis ◽  
Combination Effect

On the condition of line elastic and small deformation, more than 80% failure of the drive shaft is due to fatigue damage. It relates to the alternating stress of the drive shaft under the combination effect of bending and twisting. When drive shaft is under the combination effect of bending and twisting for civil engineering, torsion shear stress is perpendicular to bending normal stress. They can’t be simply stacked. Combining with the belt conveyor tension device of the worm transmission, first, simplify the external force; do stress analysis in horizontal plane and vertical plane respectively. Then make corresponding bending moment figure and separately calculate the internal force, stress of each basic deformation and make comprehensive bending moment figure and torque figure. Then use the application of superposition principle, the fourth strength theory to calculate worm transmission’s strength. The method makes senses to other transmission mechanism shaft bending and twisting combination strength analysis as a reference.

Ultimate Strength Analysis of Open Box Girders under Bending Moment and Lateral Pressure

2014 ◽  
Vol 578-579 ◽  
pp. 1571-1574
Author(s):  
Van Tan Vu ◽  
Wei Guo Wu
Keyword(s):  
Ultimate Strength ◽  
Lateral Pressure ◽  
Bending Moment ◽  
Nonlinear Finite Element ◽  
Strength Analysis ◽  
Nonlinear Finite Element Method ◽  
Bulk Carrier ◽  
Box Girders ◽  
Ship Model ◽  
Carrier Model

This paper made use of nonlinear finite element method to calculate the ultimate strength of bulk carrier model under bending moment and lateral pressure using a commercial FEA program, ABAQUS. It studies the ultimate strength bending moment of Nishihara bulk carrier model. This paper mainly analyzes the influence of the ultimate strength the bulk carrier model under bending moment and lateral pressure laying a foundation for accounting the ultimate strength of the actual ship model in next step.

Nonlinear Finite Element Method Ultimate Strength Analysis of Open Box Girders

2014 ◽  
Vol 919-921 ◽  
pp. 177-182
Author(s):  
Van Tan Vu ◽  
Wei Guo Wu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ultimate Strength ◽  
Bending Moment ◽  
Nonlinear Finite Element ◽  
Strength Analysis ◽  
Nonlinear Finite Element Method ◽  
Box Girders ◽  
Element Mesh ◽  
Combined Loads

In this paper, the ultimate strength of open box girders with pure torque, bending moment and combined loads are investigated using a commercial FEA program, ABAQUS. It studies the ultimate strength bending moment of Nishihara open box girders model. This paper mainly analyzes the influence of the ultimate bending moment on the open box girders by the finite element mesh, bounding conditions of the open box girders and the initial deflection.

scholarly journals Bending moment analysis of super large ore carrier based on graphical interface development

2021 ◽  
Vol 283 ◽  
pp. 01035
Author(s):  
Liu Yongchao ◽  
Liu Xiuwen ◽  
Luan Xin ◽  
Xie Xingtao
Keyword(s):  
Graphical User Interface ◽  
Bending Moment ◽  
Element Model ◽  
Strength Analysis ◽  
Graphical Interface ◽  
Hull Girder ◽  
Maximum Shear Force ◽  
Static Water ◽  
Specific Position ◽  
Beam Bending

In order to improve the safety of shipping process, this paper designs a graphical user interface for calculating the static water bending moment of super large ore earner. Due to the complexity of the actual loading conditions, the long hull girder and the mobility and sinking of cargo, the irregular distribution of gravity and buoyancy along the direction of the captain of the VLCC is prominent. In the actual loading process of ships, compartment loading is adopted in many cases, and the position where the maximum shear force and bending moment appear is generally not in the corresponding position. Traditional ship strength analysis methods can be divided into two kinds. One is to establish the ship’s finite element model to calculate the ship’s strength. The other is to calculate the ship’s strength according to the simple beam bending theory. In this paper, a 360m VALE MAX ore carrier is taken as an example to calculate the local bending moment of the ship at a specific position by using QT software. Compared with the ship loading manual, the error of the program is small, and the program has guiding significance in the actual shipping process.

scholarly journals Load calculation and strength analysis of floating garbage cleaning equipment

2021 ◽  
Vol 261 ◽  
pp. 03024
Author(s):  
Weiyao Xu ◽  
Jianting Guo ◽  
Chunyan Ji
Keyword(s):  
High Stress ◽  
Bending Moment ◽  
Strength Analysis ◽  
Floating Structure ◽  
Cleaning Equipment ◽  
Load Calculation ◽  
Calculation Results ◽  
Torque Load ◽  
Design Requirements ◽  
Vertical Bending Moment

In order to alleviate the problem that there is increasingly floating garbage pollution on the sea, this paper proposes a new design of floating garbage cleaning equipment. This equipment is a slender structure, and whether its structural strength can meet the design requirements requires special attention. In order to ensure the rationality and safety of the design, load calculation and strength analysis are carried out based on the design wave method. The calculation results show that the longitudinal torque load of this equipment is the largest, which is 2.5 times of the second largest vertical bending moment. At the same time, there are three large stress areas in the floating structure, which are the connection between the pontoon and the connecting buntons, the connecting buntons intersecting with the Y axis and the pontoons on both sides. For the abovementioned high-stress areas, a structural strengthening plan is proposed. After the improvement, the stress in the high-stress areas of the structure is significantly reduced, with a maximum reduction of 52%. The strength of the improved structure meets the design requirements. The research results of this paper can provide relevant references for the development of floating garbage cleaning equipment in the future.

scholarly journals Influence of Shear Strength of Soil on Stresses in Footing-A Review

2021 ◽  
Author(s):  
Aleena Sam ◽  
Arunima Anil A ◽  
Smitha Anna Kurian ◽  
Sujina Kabeer ◽  
Jayamohan J ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Shear Strength ◽  
Numerical Analysis ◽  
Simulation Analysis ◽  
Flexural Rigidity ◽  
Bending Moment ◽  
Approximate Solutions ◽  
Strength Analysis ◽  
Element Method

Shear strength characteristics of soil beneath the footing play a salient role on the stresses developed in the footing. In the design of foundation, it is imperative to analyse the stresses developed in it to prevent failures. Estimation of the influence of shear strength of underlying soil and flexural rigidity of footing on the shear force and bending moment developed in the foundation is necessary for effective determination of stress. Unlike conventional experimental methods, numerical analysis using Finite Element Method based geotechnical software like PLAXIS, FLAC, MIDAS etc. enables the analysis of foundations with complex stress characteristics. Finite Element Method (FEM) is a numerical analysis procedure that provides approximate solutions to various problems associated in the field of geotechnical engineering. This paper critically reviews the current literature on numerical methods to investigate the influence of shear strength of supporting soil on the structural forces developed in a footing. The relevance of the present approach to the concept of shear strength analysis is scrutinised by various numerical simulation analysis software.

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