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life prediction Based on Transient Dynamics Analysis of Van Semi-trailer with Air Suspension System

Chinese Journal of Mechanical Engineering 2011年第3期24卷 372-379页

作者： LI Liang SONG Jian HE Lin ZHANG Mengjun LI Hongzhi State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing 100084 China

The early fatigue damage in the van-body of the semi-trailer is often caused by the unique mechanical characteristics and the dynamic impact of the *** traditional finite element method with static strength analysis cannot support the fatigue design of van-body;thus,the dynamics analysis should be adopted for the endurance *** accurate dynamics model to describe the transient impacts of all kinds of uneven road and the proper system transfer functions to calculate the load transfer effects from tire to van-body are two critical factors for transient dynamics *** order to evaluate the dynamic performance,the dynamics model of the trailer with the air suspension is brought *** the analysis method of the power spectral density （PSD） is set up to study the transient responses of the road dynamic *** transient responses transferred from axles to van-body are calculated,such as dynamic stress,dynamic RMS acceleration,and dynamic load *** on the above dynamic responses,the fatigue life of van-body is predicted with the finite element analysis （FEA） *** the test parameters of the trailer with air suspension,the simulation system with Matlab/Simulink is constructed to describe the dynamic responses of the impacts of the tested PSD of the vehicle axles,and then the fatigue life is predicted with FEA *** simulated results show that the vibration level of the van-body with air suspension is reduced and the fatigue life is *** real vehicle tests on different roads are carried out,and the test results validate the accuracy of the simulation *** proposed fatigue life prediction method is effective for the virtual design of auto-body.

关键词： van-body air suspension system transient dynamics power spectral density (PSD) life prediction

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life prediction APPROACH FOR RANDOM MULTIAXIAL FATIGUE

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Chinese Journal of Mechanical Engineering 2005年第1期18卷 145-148页

作者： WangLei WangDejun SchoolofMechanicalEngineeringandAutomation NortheasternUniversityShenyang110004China

According to the concept of critical plane, a life prediction approach forrandom multiaxial fatigue is presented. First, the critical plane under the multiaxial randomloading is determined based on the concept of the weight-averaged maximum shear strain *** the shear and normal strain histories on the determined critical plane are calculated and takenas the subject of multiaxial load simplifying and multiaxial cycle counting. Furthermore, amultiaxial fatigue life prediction model including the parameters resulted from multiaxial cyclecounting is presented and applied to calculating the fatigue damage generated from each ***, the cumulative damage is added up using Miner's linear rule, and the fatigue predictionlife is given. The experiments under multiaxial loading blocks are used for the verification of theproposed method. The prediction has a good correction with the experimental results.

关键词： Multiaxial fatigue Random loading life prediction Critical plane Cyclecounting

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Online residual useful life prediction of large-size slewing bearings A data fusion method

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Journal of Central South University 2017年第1期24卷 114-126页

作者：封杨黄筱调洪荣晶陈捷 Jiangsu Key Laboratory of Digital Manufacturing for Industrial Equipment and Control Technology(School of Mechanical and Power Engineering) Nanjing Tech UniversityNanjing 210009China

To decrease breakdown time and improve machine operation reliability,accurate residual useful life(RUL) prediction has been playing a critical role in condition based monitoring.A data fusion method was proposed to achieve online RUL prediction of slewing bearings,which consisted of a reliability based RUL prediction model and a data driven failure rate(FR) estimation ***,an RUL prediction model was developed based on modified Weibull distribution to build the relationship between RUL and ***,principal component analysis(PCA) was introduced to process multi-dimensional life-cycle vibration signals,and continuous squared prediction error(CSPE) and its time-domain features were employed as equipment performance degradation ***,an FR estimation model was established on basis of the degradation features and relevant FRs using simplified fuzzy adaptive resonance theory map(SFAM) neural ***,real-time FR of equipment can be obtained through FR estimation model,and then accurate RUL can be calculated through the RUL prediction *** of a slewing bearing life test show that CSPE is an effective indicator of performance degradation process of slewing bearings,and that by combining actual load condition and real-time monitored data,the calculation time is reduced by 87.3%and the accuracy is increased by 0.11%,which provides a potential for online RUL prediction of slewing bearings and other various machineries.

关键词： slewing bearing life prediction Weibull distribution failure rate estimation data fusion

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Preload relaxation analysis and reliable life prediction of space connection and separation device based on accelerated degradation tests

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Chinese Journal of Aeronautics 2023年第3期36卷 202-211页

作者： Gen LIU Qiong WU Zhihua WANG Yixin LUO Yufeng QI School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Institute of Spacecraft System Engineering China Academy of Space TechnologyBeijing 100081China

The safety and reliability of space connection and separation device has become a key issue due to the increasing service span of deep space exploration *** long-term preload relaxation(a key failure mode)of connection and separation devices is focused in this paper.A series of tests have been designed and implemented to investigate the preload relaxation regulation and a comprehensive method has been constructed to analyze and predict the reliable lifetime of the *** two-stage preload relaxation law of the device is found and reasonably *** to the different relaxation mechanism,the first-stage preload relaxation is assessed based on the working-condition test results,and the second-stage preload relaxation is characterized by accelerated test ***,the service reliability and reliable life are *** experiment and assessment results demonstrate the reasonability and effectiveness of the proposed method which can achieve long-service reliability analysis for space connection and separation device within limited time.

关键词： Accelerated degradation tests life prediction Preload relaxation Reliability-analysis Space connection and separation device

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Multiaxial fatigue life prediction of composite laminates

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Chinese Journal of Aeronautics 2021年第12期34卷 227-237页

作者： Jingmeng WENG Tong MENG Weidong WEN Shaodong WENG Xi'an Aerospace Propulsion Institute Xi'an 710100China Academy of Space Electronic Information Technology Xi'an 710100China College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Mechcmo-Electronic Engineering Xidian UniversityXi'an 710071China

A study of composite laminates under tension–torsion biaxial loading is *** focus is placed on fatigue lives of composite laminates under different tension–torsion biaxial fatigue loading paths.A macro-meso model used to predict multiaxial fatigue life of composite laminates is also presented in this ***,a macro-scale 3 D RVE corresponding to composite laminates is established to determine strain components in the material principal direction of each layer for each biaxial stress ***,a meso-scale 3 D RVE corresponding to each layer with fibers distributed randomly is established,with progressive damage prediction method,biaxial strength of composite laminates can be predicted,and the final failure layer can be ***,select any one of fatigue loading path at which the final failure of composite laminates is fiber failure(matrix failure)to establish the reference curve for fiber(matrix).Finally,with reference curve,fatigue life of composite laminates under any biaxial loading path can be *** numerical results show good agreements with experimental data.

关键词： Composite laminates Fatigue damage parameter life prediction Multiaxial fatigue Multiaxial strength

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A new fatigue life prediction model considering the creep-fatigue interaction effect based on the Walker total strain equation

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Chinese Journal of Aeronautics 2020年第9期33卷 2382-2394页

作者： Siyuan CHEN Dasheng WEI Jialiang WANG Yanrong WANG Xianghua JIANG School of Energy and Power Engineering Beihang UniversityBeijing 100083China Beijing Key Laboratory of Aero-Engine Structure and Strength Beijing 100083China Jiangxi Research Institute Beihang UniversityNanchang 330096China Science and Technology on Scramjet Laboratory Beijing Power Machinery InstituteBeijing 100074China

The performance of high-temperature components of aero-engines under the CreepFatigue Interaction(CFI)behavior gets more attention *** this research,the creepfatigue tests of two superalloys of Powder Metallurgy(PM)FGH96 and direct aging GH4169 were performed at 650°C with different types of dwell,and the fracture morphology of FGH96 specimens was observed by Scanning Electron Microscopy(SEM)to analyze the creep-fatigue fracture feature and crack ***,according to phenomenology,the effect of dwell was introduced to develop a new uniaxial fatigue life prediction model based on the total strain equation,which has capability to take dwell time and load ratio into account *** equations were utilized to model the test data of PM FGH96 and GH4169,together with data of another superalloy PM FGH95 conducted previously.A prominent prediction ability of the model in creep-fatigue life prediction of different superalloys has been *** data points of test data and estimated data are located within two times scatter band,which is ideal in engineering.

关键词： Creep-fatigue interaction(CFI) Creep-fatigue test life prediction Low-cycle fatigue(LCF) Superalloy

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FATIGUE life prediction OF RC BEAMS STRENGTHENED WITH PRESTRESSED CFRP UNDER CYCLIC BENDING LOADS

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Acta Mechanica Solida Sinica 2013年第1期26卷 46-52页

作者： Peiyan Huang Guangwan Liu Xinyan Guo Hao Zhou Xiaohong Zheng School of Civil Engineering and Transportation South China University of Technology State Key Laboratory of Subtropical Building Science South China University of Technology

The application of prestressed carbon reinforced polymer （prestressed CFRP） in reinforced concrete （RC） members can improve the mechanical properties of strengthened structures and strengthening efficiency. This paper proposed a semi-empirical prediction fornmla of fatigue lives of the RC beams strengthened with prestressed CFRP under bending loads. The formula is established based on the fatigue life prediction method of RC beams and fatigue experimental data of non-prestressed CFRP reinforced beams done before. Fatigue effect coefficient of the formula was confirmed by the fatigue experiments of the RC beams strengthened with prestressed carbon fiber laminate （prestressed CFL） under cyclic bending loads. Fatigue lives of the strengthened beams predicted using the formula agreed well with the experimental data.

关键词： prestressed carbon fiber reinforced polymer (prestressed CFRP) carbon fiber laminate (CFL) fatigue effect coefficient life prediction bending load

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Tension-Torsion High-Cycle Fatigue life prediction of 2A12-T4 Aluminium Alloy by Considering the Anisotropic Damage:Model, Parameter Identification, and Numerical Implementation

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Acta Mechanica Solida Sinica 2016年第4期29卷 391-406页

作者： Linlin Sun Miao Zhang Weiping Hu Qingchun Meng Institute of Solid Mechanics School of Aeronautic Science and Engineering Beihang University Institute of Manned Space System Engineering China Academy of Space Technology

To consider the anisotropic damage in fatigue, an improved boom-panel model is presented to simulate a representative volume element (RVE) in the framework of continuum damage mechanics. The anisotropic damage state of the RVE is described by the continuity extents of booms and panels, whose damage evolutions are assumed to be isotropic. The numerical implementation is proposed on the basis of damage mechanics and the finite element method. Finally, the approach is applied to the fatigue life prediction of 2A12-T4 aluminium alloy specimen under cyclic loading of tension-torsion. The results indicate a good agreement with the experimental data.

关键词： boom-panel model anisotropic damage fatigue tension-torsion life prediction

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Characterization and life prediction of single-pass honing tool for fuel injection nozzle

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Chinese Journal of Aeronautics 2021年第4期34卷 225-240页

作者： Changyong YANG Hao SU Shaowu GAO Qingfeng AI Yucan FU Wenfeng DING Jiuhua XU College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Kompetenzzentrum für Spanende Fertigung Furtwangen UniversityTuttlingen 78532Germany

Single-pass honing is an important machining method for finish machining of holes,which can meet the requirement for high efficiency and consistency of *** and life prediction of single-pass honing tool are necessary to improve the machining accuracy of holes honed,especially dimension ***-pass honing tool is a single layer abrasive tool with fixed dimension,which still remains problematic for characterization and life *** fuel injection nozzles with bore diameter under 1 mm,the stiffness of the single-pass honing tool is *** article presents a novel analytical model that predicts life of the tool with poor ***,according to the bore diameter and dimension tolerance,the single-pass honing tool is designed and *** on the prepared single-pass honing tool,the measurement and characterization methods are ***,the tool wear tests are carried out,and the tool contour evolution model is established to predict the tool life.

关键词： Fuel injection nozzle life prediction Single-pass honing tool Tool contour evolution Tool stiffness

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A Two-point Method for Multiaxial Fatigue life prediction

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Acta Mechanica Solida Sinica 2022年第2期35卷 316-327页

作者： Jianhui Liu Xuemei Pan Youtang Li Xiaochuang Chen School of Mechanical and Electrical Engineering Lanzhou University of TechnologyLanzhou 730050China Lanzhou Jinchuan Advanced Materials Technology Co. Ltd.Lanzhou 730101China

Fatigue fracture is one of the most common failure modes of engineering compo-nents,and the combined action of geometrie discontinuity and multiaxial loading is more likely to cause severe fatigue damage of *** work focuses on the fatigue behavior of U-notched Q345 steel specimens with differen t notch sizes under proportional cyclic ***,based on the concept of strain energy,the calculation method of critical plane is given and the equivalent stress of the specified path on the critical plane is extracted to char-acterize the equivalent stress distribution state and the stress gradient ***,based on the high stress volume method and theory of critical distance,a simple method for determining the critical distance is given considering the contribution of stress at the dangerous point and the critical *** addition,based on the idea of stress-distance normalization,a new stress gradient impact factor is defined and a new method for predicting the multiaxial fatigue life of notched specimens is *** prediction results of the proposed model,the local stress-strain method and the point method of theory of critical distance are compared with the experimental *** comparisons show that the prediction results of the proposed model are closer to experimentai life,and the calculation accuracy is higher.

关键词： Multiaxial fatigue Stress gradient life prediction Critical distance method Local stress-strain method

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