Design improvement and fatigue analysis for a bicycle handlebar stem system using uniform design method and genetic algorithm

2020 ◽  
Vol 234 (11) ◽  
pp. 2266-2278
Author(s):  
Cho-Pei Jiang ◽  
Ching-Wei Wu ◽  
Yung-Chang Cheng
Keyword(s):  
Genetic Algorithm ◽  
Objective Function ◽  
Safety Factor ◽  
Uniform Design ◽  
Optimization Procedure ◽  
Bending Test ◽  
Von Mises Stress ◽  
Kriging Interpolation ◽  
Optimized Design ◽  
Von Mises

An integrating optimization procedure is presented to improve the von Mises stress and fatigue safety factor for a handlebar stem system in a bicycle system. The optimization procedure involves uniform design of experiment, Kriging interpolation, genetic algorithm, and nonlinear programming method. Using ANSYS/Workbench software and the ISO 4210 bicycle handlebar stem testing standard, the von Mises stress for the lateral bending test simulation and the fatigue safety factor for the fatigue test simulation is calculated. The von Mises stress and fatigue safety factor are combined into a single and integrated objective function, and Kriging interpolation is then used to create the surrogate model of the integrated objective function. When the integrating optimization procedure is used, the integrated objective function demonstrates that the von Mises stress for the optimized handlebar stem is reduced to 225 MPa and the fatigue safety factor increases to 1.796. This shows that the optimized design increases the strength of the handlebar stem. The proposed technique yields a handlebar stem with an optimized shape.

Optimization design of rail clip in Vossloh fastening system by uniform design and grey relation analysis

2021 ◽  
pp. 095440622199552
Author(s):  
Yung-Chang Cheng ◽  
Chen-Ming Kuo ◽  
Cheng-Kang Lee ◽  
Min-Sheng Xie
Keyword(s):  
Safety Factor ◽  
Optimization Design ◽  
Interpolation Method ◽  
Uniform Design ◽  
Design Procedure ◽  
Von Mises Stress ◽  
Kriging Interpolation ◽  
Original Design ◽  
Kriging Interpolation Method ◽  
Von Mises

This study presents the innovative optimization design procedure to increase the strength and fatigue safety of a fastening system under the static and fatigue loading. Applying the uniform design of experiment, a group of simulation experiment is generated. Utilizing ANSYS/Workbench software, the finite element models are constructed and used to evaluate the von Mises stress of rail clip for EN 13146-1 and EN 13146-2 testing simulations. Furthermore, the fatigue safety factor of rail clip for EN 13146-4 testing simulation is also presented. By the Kriging interpolation method, the surrogate models are rebuilt by the input and output data from the uniform design. Applying grey relational analysis, entropy weighting method, genetic algorithm and Hooke–Jeeves algorithm, the improvement design version is presented by solving the multi-objective optimization problem. Compared with the original design, the maximum von Mises stress of rail clip has been decreased to 25.189 MPa, the fatigue safety factor is upgraded to 3.829. As a result, the strength and fatigue safety of the rail clip in the fastening system is increased.

Design Optimization of Wind Turbine Using Fluid Structural Interaction Analysis and Genetic Algorithm

2014 ◽  
Author(s):  
Ganesh Ram Ramanujam Karthikeyan ◽  
Akshan Paresh Mehta ◽  
Karthikeyan Ramanujam ◽  
Kalaichelvi Venkatesan
Keyword(s):  
Genetic Algorithm ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Interaction Analysis ◽  
Simulation Software ◽  
Wind Turbine Blade ◽  
Von Mises Stress ◽  
Optimized Design ◽  
Computational Fluid Dynamics Analysis ◽  
Von Mises

Aerodynamics of wind turbine blade is an important field of research. In the present study, a multi stage optimization process has been evaluated on a baseline wind turbine blade. Genetic Algorithms (GAs) are applied as a generative and search procedure to look for optimized design solutions in terms of aerodynamic performance of the airfoil selected for the study. The MatLab Genetic Algorithm toolbox interfaced with Xfoil, an interactive program for the design and analysis of airfoils, was implemented for the profile design optimisation. To analyse the performance of the optimized profile, the ANSYS Fluent toolbox was used to conduct the 3D computational fluid dynamics analysis of a section of the wind turbine blade before and after optimization. The total deformation and Von-Mises stress of the wind turbine blade caused due to Fluid-Structure Interaction is analysed using the ANSYS simulation software.

scholarly journals The effect of fillet radius and length of the thick-walled cylinder on Von Mises stress and safety factor for rocket motor case

2020 ◽  
Author(s):  
Lasinta Ari Nendra Wibawa ◽  
Kuncoro Diharjo ◽  
Wijang Wisnu Raharjo ◽  
Bagus Hayatul Jihad
Keyword(s):  
Safety Factor ◽  
Rocket Motor ◽  
Von Mises Stress ◽  
Fillet Radius ◽  
Von Mises ◽  
Walled Cylinder

Improvement Design of Adhesive Layer on Honeycomb Structure for Railway Vehicle System by Uniform Design Method

2020 ◽  
Vol 830 ◽  
pp. 53-58
Author(s):  
Yung Chang Cheng ◽  
Pongsathorn Pornteparak
Keyword(s):  
Design Method ◽  
Uniform Design ◽  
Equivalent Stress ◽  
Adhesive Layer ◽  
Honeycomb Structure ◽  
Von Mises Stress ◽  
Railway Vehicle ◽  
Original Design ◽  
Control Factors ◽  
Von Mises

The purpose of this paper focuses on adhesive layer strength while having a thermal cycling of honeycomb composite sandwich structure by using the uniform design of experiments method improving the von Mises stress of honeycomb structure. Three system parameters of the honeycomb structure are selected as the control factors to be improved. Uniform design of experiment is applied to create a set of simulation experiments. Applying ANSYS/Workbench software, the finite element modelling is investigated and the von Mises stress of the honeycomb structure is calculated under metal-honeycomb core flatwise tensile test. From the numerical results, the best honeycomb structure dimension of all the experiments which causes the smaller von Mises stress is selected as the improved version of design. Finally, the best model of the experiments which causes the minimum equivalent stress is regarded as the improved version of design. Compared with the original design, the result of ASTM C297 improved version is 17.386 MPa, which mean improved 36.28%, ASTM C364 improved version is 19.015 MPa, which mean improved 25.26%, ASTM C365 improved version is 16.86 MPa, which mean improved 12.35%.

New Triaxial Connection Safety Factor for Tubular Design

2021 ◽  
Author(s):  
Malcolm A Goodman
Keyword(s):  
Hydrostatic Pressure ◽  
Normal Stress ◽  
Safety Factor ◽  
Drill Pipe ◽  
Von Mises Stress ◽  
Threaded Connections ◽  
Shear Component ◽  
Physical Tests ◽  
The Mean ◽  
Von Mises

Abstract The API equation for internal leak of API connections is uniaxial since it ignores axial force and external backup pressure. ISO 13679 for qualification of premium connections is biaxial at best. It includes tension/compression but ignores backup pressure for both internal and external leak tests. For tubular design, this paper introduces a new fully triaxial safety factor for threaded connections with dependence on thread shear and hydrostatic pressure. Hydrostatic behavior is modelled with the Mean Normal Stress, and thread shear behavior is modelled with the shear component of the von Mises Stress. A Leak Line for use like the pipe body ellipse is proposed for quick leak assessment. Leak ratings are presented for an example case of 7-in. 35-ppf N80 LTC. The new triaxial safety factor with two connection constants applies to all types of threaded connections, including tubing, casing, and drill pipe, so long as the two constants are evaluated with appropriate but simple physical tests.

New Triaxial Connection Safety Factor for Tubular Design

2021 ◽  
pp. 1-11
Author(s):  
Malcolm A. Goodman
Keyword(s):  
Finite Element Analysis ◽  
Safety Factor ◽  
American Petroleum Institute ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Threaded Connections ◽  
Shear Component ◽  
Physical Tests ◽  
The Mean ◽  
Von Mises

Summary The American Petroleum Institute (API) equation for internal leak of API connections is uniaxial because it ignores axial force and external backup pressure. The ISO 13679 (2002) standard for qualification of premium connections is biaxial at best. It includes tension/compression but ignores backup pressure for both internal and external leak tests. For tubular design, this paper introduces a new fully triaxial safety factor for threaded connections with dependence on thread shear and hydrostatic pressure. Triaxial hydrostatic behavior is modeled with the mean normal stress, and thread shear behavior is modeled with the shear component of the von Mises stress. A leak line for use like the pipe body ellipse is proposed for quick leak assessment. Leak ratings and correlation with finite element analysis (FEA) results are presented for an example case of a 7-in.35-ppf N80 long-thread-casing (LTC) connection. The new triaxial safety factor with two connection constants applies to all types of threaded connections, including tubing, casing, and drillpipe, so long as the two constants are evaluated with appropriate but simple physical tests.

scholarly journals FEM Modeling of Delamination in AS4/PEEK Thermoplastic Composites under Mixed – Mode Bending Test

Mechanika ◽  
2020 ◽  
Vol 26 (2) ◽  
pp. 120-125
Author(s):  
IONESCU VIOREL
Keyword(s):  
Mixed Mode ◽  
Strain Energy ◽  
Laminated Composite ◽  
Bending Test ◽  
Von Mises Stress ◽  
Thermoplastic Composites ◽  
Displacement Curve ◽  
Fem Modeling ◽  
Energy Rate ◽  
Von Mises

Interfacial failure by delamination in the unidirectional AS4/PEEK laminated composite was simulated through this paper with a finite element method (FEM) based model developed with Comsol Multiphysics software. The mixed – mode bending (MMB) test was investigated numerically here after a successful validation of the model by comparing with experimental measurements of the load –displacement curve provided in the literature. The maximum delamination length of the specimens modeled, the corresponding von Mises stress distributions and the damage evolution function have been evaluated for different ratios between mode II strain energy rate and total strain energy rate GII/GT = 20%, 50% and 80%.

scholarly journals Influence of the Realistic Artery Geometry Parameters on a Coronary Stent Fatigue Life

2019 ◽  
Vol 16 (03) ◽  
pp. 1842006 ◽  
Author(s):  
Xinyang Cui ◽  
Qingshuai Ren ◽  
Gaoyang Li ◽  
Zihao Li ◽  
Aike Qiao
Keyword(s):  
Fatigue Life ◽  
Fatigue Resistance ◽  
Safety Factor ◽  
Geometric Model ◽  
Von Mises Stress ◽  
Stress Distributions ◽  
Goodman Diagram ◽  
Von Mises ◽  
Geometry Parameter ◽  
Artery Geometry

The stents’ adaptability and safety in realistic and idealized stenotic coronary model were compared to investigate the influence of artery geometry parameter on stent fatigue life. The stents’ fatigue resistance ability was calculated using Goodman diagram, and the cycle to failure, the fatigue life, and the fatigue safety factor (FSF) were analyzed. Although the peak top of the von Mises stress was located at the bending area of crowns, the stress distributions were different in the two models. Considering the safety and accuracy, it is necessary to use a realistic geometric model to calculate the stent fatigue performance.

DESAIN DAN ANALISIS KEKUATAN TANGKI FIRE WATER STORAGE TANK TIPE FIX CONE ROOF KAPASITAS 1500 KL DENGAN PERHITUNGAN AKTUAL DAN SIMULASI SOFTWARE

2021 ◽  
Vol 26 (1) ◽  
pp. 69-78
Author(s):  
Aji Abdillah Kharisma ◽  
Ahmad Fadel Givari ◽  
Irvan Septyan Mulyana
Keyword(s):  
Yield Strength ◽  
Internal Pressure ◽  
Safety Factor ◽  
Storage Tank ◽  
Water Storage ◽  
Von Mises Stress ◽  
Data Input ◽  
Simulation Data ◽  
Water Storage Tank ◽  
Von Mises

Storage tank adalah alat yang dibutuhkan dalam industri minyak bumi dan gas. Fungsi dari storage tank ialah untuk menyimpan fluida dalam jumlah yang besar. Tangki timbun harus memiliki dinding yang kuat untuk menahan suatu tekanan, maka tangki tersebut tidak mengalami kerusakan. Penelitian ini membahas tentang kekuatan desain fire water storage tank, dari kriteria faktor keamanan, von misses, dan displacement. Metode yang digunakan adalah metode perhitungan actual dan metode analysis simulasi (analysis simulation). Data input desain shell diberi internal pressure sebesar (1 atm) atau (0,101325 MPa), pada hasil simulasi solidworks didapatkan nilai dari von mises stress sebesar (150,49 MPa), safety factor (1,36), dan displacement (5,95 mm). Hasil metode perhitungan aktual didapatkan nilai von mises sebesar (155,245 MPa), safety factor (1,32), dan displacement (4,274 mm). Berdasarkan hasil analisa desain dari storage tank dapat dinyatakan aman digunakan dikarenakan nilai von mises berada dibawah nilai yield strength (205 MPa), safety factor berada pada kisaran (1-10), serta displacement yang tidak terlalu signifikan.

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