Papers by Keyword: Fatigue Analysis

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Authors: Xin Cai Zhong, Zhen Yu Wu, Kai Song
Abstract: Complex road excitation,has long been the key and difficulty of simulation technology for vehicle fatigue. The main error source of the technology is the deviation that virtual road and simulation speed are not true of proving ground test. An improved method was presented. The long-distance virtual road which consisted of a variety of typical pavements was built and used as the excitation, and the measured speed was applied to the virtual test. So the virtual test could be a true reflection of the road conditions of the proving ground, and improve the accuracy of the load that the fatigue analysis required. Finally, the linear superposition method was used to rapidly predict the fatigue life. In the durability project of a certain vehicle,it was proved that the virtual test could reproduce the road conditions of Hainan proving ground by comparing with the measured values of accelerations of wheel hub. The example of the front wheel cover plate proved that this method could efficiently and accurately predict the vehicle body fatigue life.
Authors: Ionica Rubanenco, Iulia Mirciu, Leonard Domnisoru
Abstract: This paper is focused on an advanced method for ship structures fatigue assessment. The ships classification societies standard rules for fatigue analysis are based on simplified procedures, with wave induced loads obtained by linear oscillation analysis (low frequency, around 0.1 Hz), or equivalent statistical wave loads. In the case of large elastic ship structures, with hull length over 150 m, the global wave induced vibration response (high frequency, around 1 Hz) becomes significant. The developed integrated method for large ships fatigue assessment includes three interlinked analyses, as follows: the hot-spot stresses evaluation by 3D finite element models, wave induced loads by short term linear and non-linear hydroelastic dynamic analysis, ship service life and fatigue assessment by damage cumulative ratio method. As testing ship, it is considered a double hull LPG Liquefied Petroleum Gas carrier, with total length 239 m, for a set of structural details with stress hot-spots. Based on the non-linear hydroelastic wave loads, the integrated method of fatigue assessment becomes more accurate, predicting for the amidships structure 14 years of ship service life, instead of over 20 years according to the rules standard approach, so that the confidence on ship structure fatigue evaluation can be increased in the design process.
Authors: Xiao Ping Chen, Ru Fu Hu, Shu Hua Zheng
Abstract: Aiming at the complex mechanical systems for the prediction of the fatigue limit load requirements, this paper examines the relationship among finite element analysis model and the performance models. And a finite element modeling method for fatigue analysis is proposed. The finite element model can support static, modal, fatigue, and multi-body dynamic response analysis in parallel and collaboration. This method helps improve the fatigue limit load analysis.
Authors: Cai Hong Qu, Wei Han, Yan Ming Wang
Abstract: The fatigue analysis of the mental bellows had been analyzed. The fatigue tests were designed based on orientation displacement Compared the result of analysis on ANSYS with the result of experiment, the method of fatigue analysis is reliable. Furthermore, an important suggestion should be made that the orientation displacement should be reduced when the mental bellows was used Keyword: fatigue analysis; mental bellows; ANSYS
Authors: Jiang Tao Xu, Yan Dong Song
Abstract: This paper based on the data of enterprise’s bench test, first set up the finite element analysis model for the front sub-frame by using the of professional finite element analysis software and fatigue life analysis software, then got the distribution information (such as the situation and the cycles) for the front sub-frame after analyzing, with these messages not only easily found out the danger area, but also provided reference for bench test improving, once more found a method that can forecast the life for mechanical products.
Authors: Nan Nan Xu, Ping Huai Mao, Bing Zhai
Abstract: Based on the ANSYS Software the Ho-type cutting pick of Spiral Drum Shearer applied lasers coating is feasible analysis. At first the paper describes the Spiral Drum Shearer’s overall body and elicit to its traditional materials. Then analysis the head of Cutting pick’s traditional materials in order to apply with lasers coating. Then simulate it and Fatigue calculation by ANSYS Software. By analysis of the coating pick is found that the Cutting pick’s life can develop well. So it has a nice economic Potential.
Authors: Miao Hua Huang, Huan Luo, Si Wu Yi
Abstract: Accurate FEA model of torsion beam suspension and its strain histories are keys to precisely predicting its fatigue life. A strain analysis method is presented, integrating FEA and neural network analysis. The displacement and force histories of the wheel center and strain histories of multiple measurement points on the suspension are measured from road durability test. Apply transient response analysis to determine the FEA model and obtain strain histories of the measurement points. Use a neural network method to obtain accurate additional load. By comparing analysis results and test data, the accurate strain response of torsion beam suspension can be gained
Authors: Li Bo Zhou, Wei Zheng, Su Hua Liu
Abstract: The structure of the sensor endurance test station is designed. Satisfied with the request of the performance, structural parameters of the spindle and bearing are calculated to minimize the spindle mass using optimization theory. By the static analysis, fatigue analysis and frequency analysis of spindle and bearing using the FEM, the simulation results indicate that the optimized structures can meet the demands for the strength and dynamics of the flywheel system, which leads to safe and stable work, improve design efficiency effectively, shorten design cycles, and reduce production costs. In order to reduce the eccentric force of inertia and intensity of the vibration source, the need for computing unbalance spindle, and a mechanism for balancing, allowed reaching equilibrium precision. After commissioning test station, running at high speed working in good condition, system run more smoothly, to meet the requirements.
Authors: Jarosław Piekło, Maria Maj, Robert Żuczek, Adam Zachura
Abstract: The use of the innovative design of gears segments of drivetrain engine of a longwall shearer’s haulage system with highly loaded components has improved tribological pairs of gear-tooth. The elimination of structurally complex sets of gears allowed to reduce the cost of individual component of the system, reduction of the failure rate and significantly improve the processes of repair and maintenance. The article presents the results of experimental and numerical analysis of stress and strain variables in highly loaded gear element of haulage system. The experimental studies of L20HGSNM steel alloy from which the casting was produced included basic research of strength properties of the material and two types of fatigue tests: in the range of a small number of cycles - a classic LFC and modified MLCF test. Acquired material properties of the steel alloy allowed to create material characteristics and fatigue strength curve, which were used in FEM calculations. Based on the results of numerical calculations and multiaxial criteria the fatigue life of the casting gears were evaluated.
Authors: Jae Hoon Kim, Duck Hoi Kim, Young Shin Lee, Gi Gwang Kim
Abstract: This paper presented the results for experimental investigations and numerical analysis performed with the aim of studying on fatigue life of hobbed and cold forged bevel gears used in automobiles. To evaluate the bending fatigue strength improvement by cold forging process, fatigue test and analysis were performed. For the monotonic fatigue loading, bending fatigue test and analysis were carried out. To simulate the real driving condition, random fatigue loading was defined here, and the random fatigue analysis was also performed. It was concluded that fatigue life and crack initiation sites of automotive bevel gear were well agreed with the test results. Fatigue lives for hobbed and cold forged bevel gear from experimental and analytical investigation were also presented and compared.
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