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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 presented.The 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 paper.Firstly,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 ratio.Secondly,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 confirmed.Thirdly,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 predicted.And numerical results show good agreements with experimental data.

关键词： Composite laminates fatigue damage parameter Life prediction Multiaxial fatigue multiaxial strength

Multiaxial fatigue life prediction of kiln roller under axis line deflection

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Applied Mathematics and Mechanics(English Edition) 2010年第2期31卷 205-214页

作者：沈意平王送来李学军 B.S.DHILLON Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Hunan University of Science and Technology Department of Mechanical Engineering University of Ottawa

This paper investigates the Multiaxial fatigue life of the roller in rolling contact with wheels with respect to axis line deflection. The Multiaxial fatigue criteria proposed by Wang and Brown, together with the ralnflow counting method and Miner- Palmgren＇s rule, are applied to the cumulative damage estimation and life prediction. As the axis line deflection of overlong kilns generally results in asymmetric load distribution on each roller, the load ratio is introduced to describe the deflection for quantitative stress analyses. The stress analyses are performed within the finite element code ANSYS. The tangential friction stress is calculated in terms ：of the condition of the rolling contact area. By taking one roller as an example, the plotted fatigue life versus load ratio curve discovers how the axis line deflection affects the fatigue life. This study is significant to prevent the fatigue failure of the roller and can provide basis to adjust and optimize the axis line of the rotary kiln.

关键词： Multiaxial fatigue fatigue life axis. line deflection rolling contact

multiaxial CREEP-fatigue LIFE EVALUATION UNDER PROPORTIONAL LOADING

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Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 355-360页

作者： Y.Noguchi M.Miyahara Corporate Research & Development Laboratories Sumitomo Metal Industries Ltd. Amagasaki Hyogo 660-0891 JapanCorporate Research & Development Laboratories Sumitomo Metal Industries Ltd. Amagasaki Hyogo 660-0891 Japan

A new method was proposed for the multiaxial creep-fatigue life evaluation under proportional loadings. Because this method was derived from the strain range partitioning method with a multiaxiality factor, it was possible to consider the influence of both creep-fatigue interaction and multiaxial stress state on fatigue life. In order to predict the combined axial-torsional fatigue life the damage under combined loading was defined as linear summation of the damages under axial loading and torsional loading. Axial-torsional creep-fatigue tests were carried out using tubular specimens of 316LC austenitic stainless steel and the ferritic rotor steel. This rotor steel was developed for the permanent magnet type eddy current retarder in heavy trucks. Experimentally obtained lives of both steels were well corresponded with the lives predicted by the proposed method. It was found that the proposed method was effective in Multiaxial fatigue life evaluation under proportional creep-fatigue loadings.

关键词： Multiaxial fatigue creep-fatigue proportional loading life evaluation

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 direction.Then 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 cycle.Finally, 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

A UNIFIED Multiaxial fatigue DAMAGE PARAMETER

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Acta Mechanica Solida Sinica 1998年第3期11卷 261-274页

作者： Shang Deguang Wang Dejun Xu Hao Nanjing Univ Aeronaut & Astronaut Dept Aircraft Engn Nanjing 210016 Peoples R China

According to the critical plane principle, a unified multiaxialfatigue damage parameter is presented based on the varying behaviourof the strains on the critical plane. Both the parameters of themaximum shear strain amplitude and normal strain excursion betweenadjacent turning points of the maximum shear strain on the criticalplane are considered in the Multiaxial fatigue damage parme- terpresented. An equivalent strain amplitude is made with bothparameters of the maximun shear strain amplitude and normal strainexcursion by means of von Mises criterion. Thus a new multiaxialfatigue damage model is given based on the critical plane approach.

关键词： Multiaxial fatigue critical plane approach proportional loading

焊接结构接头处损伤评估的高循环疲劳分析方法的选择原则

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Journal of Marine Science and Application 2022年第4期21卷 116-133页

作者： Skirmantas Pargalgauskas Xiaoli Jiang Marcel Edelkamp Dingena Schott Department of Maritime and Transport Technology Delft University of TechnologyDelft 2628CDNetherlands In Summa Inovation B.V. Raamsdonksveer 4941VVNetherlands

The main purpose of this paper is to provide a summarized general guideline to aid decision making of choosing the type of fatigue analysis approach,best suited for modelling and evaluating high-cycle fatigue damage in welded structural joints.It describes how addition of stress concentration and stress direction information into fatigue assessment methodology affect simulated fatigue damage accumulation results and when it is beneficial or necessary to use a particular fatigue damage estimation approach.The focus is on stress-life curve based approaches,particularly when deciding between variants of nominal,hot-spot or Multiaxial fatigue assessment approaches for evaluating fatigue damage within welded joint structures.Evaluation is illustrated through application of proposed methodology to choose and perform fatigue assessment for a non-conventional load-bearing tubular joint structure within a floating lemniscate crane upper arm,which has been observed of being prone to aggressive crack propagation within its welds.Damage within the structure is estimated using two non-optimal fatigue analysis approaches to verify applicability of proposed selection methodology.Results are then summarized through comparative assessment and findings are discussed based on what leads to result changes within each fatigue damage analysis approach.

关键词： fatigue analysis Multiaxial fatigue Hot-spot fatigue Methodology Welded joints

Numerical Simulation of Fretting fatigue Damage Evolution of Cable Wires Considering Corrosion and Wear Effects

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Computer Modeling in Engineering & Sciences 2023年第8期136卷 1339-1370页

作者： Ying Wang Zheng Yan Yangyang Wu Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education Southeast UniversityNanjing211189China

In this paper,a numerical model of fretting fatigue analysis of cablewire and the fretting fatigue damage constitutive model considering the multi-axis effect were established,and the user material subroutine UMAT was written.Then,the constitutive model of wear morphology evolution of cable wire and the constitutive model of pitting evolution considering the mechanical-electrochemical effect were established,respectively.The corresponding subroutines UMESHMOTION_Wear and UMESHMOTION_Wear_Corrosion were written,and the fretting fatigue lifewas further predicted.The results showthat the numerical simulation life obtained by the programin this paper has the same trend as the tested one;the error is only about 0.7%in the medium life area;When the normal contact force increases from 120 to 240 N,the fretting life of cable wire decreases by 25%;When the evolution of wear morphology and corrosion effect are considered simultaneously,the depth of the wear zone exceeds 0.08mm after 600,000 loads,which ismuch larger than 0.04 mmwhen only the evolution of wear morphology is considered.When the evolution of wear morphology and corrosion morphology is considered simultaneously,the damage covers the whole contact surface after 300,000 loads,and the penetrating damage zone forms after 450,000 loads,which is obviously faster than that when only the wearmorphology evolution is considered.Themethod proposed in this paper can provide a feasible numerical simulation scheme for the visualization of the damage process and accurate life prediction of cable-supported bridges.

关键词： Fretting fatigue Multiaxial fatigue electrochemical corrosion damage evolution life prediction

Multi-axial fatigue of 2024-T4 Aluminum Alloy

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Chinese Journal of Mechanical Engineering 2011年第2期24卷 195-201页

作者： WANG Xiaogui GAO Zengliang QIU Baoxiang WANG Limei JIANG Yanyao College of Mechanical Engineering Zhejiang University of Technology Hangzhou 310032 China Department of Mechanical Engineering University of Nevada Reno NV89557 USA

Only the fatigue initiation is considered by the safe-life design approach,while fatigue crack propagation is paid more attention by the damage tolerance approach.The reasonable fatigue design method and durability assessment standard should give these two phases equivalent concerns.To develop a unified model of fatigue initiation and crack propagation,a great deal of baseline fatigue properties of a material should be obtained by fatigue experiments.However,there is lack of thorough and comprehensive experiment study on the fatigue properties of 2024-T4 aluminum alloy,which is widely used as load-bearing components in aircraft industry.In this paper,strain-controlled uniaxial,torsion,and combined axial-torsion fatigue experiments are conducted on 2024-T4 aluminum alloy in ambient air.Fully reversed uniaxial and pure torsion experiments employ solid cylindrical specimens.fatigue experiments under the fully reversed shear loading with a static axial stress,proportional axial-torsion loading,and 90°out-of-phase axial-torsion nonproportional loading are conducted by using thin-walled tubular specimens.The experimental results show that the mean stress has a significant influence on the fatigue strength of the material.A tensile mean stress decreases the fatigue life dramatically,while a compressive mean stress increases the fatigue life.The strain-life fatigue results obtained from the fully reversed uniaxial fatigue experiments can be represented by one smooth curve of a three-parameter equation.However,two fitting curves are needed for characterizing the results of the fully reversed pure torsion fatigue tests because of the existence of an obvious kink.The baseline fatigue properties of 2024-T4 aluminum alloy obtained from the fatigue experiments have applications for the fatigue design and safe assessment of engineering components.

关键词： 2024-T4 aluminum alloy fatigue life loading path Multiaxial fatigue SWT fatigue parameter

fatigue LIFE PREDICTION OF CRANKSHAFT MADE OF MATERIAL 48MnV BASED ON fatigue TESTS,DYNAMIC SIMULATION AND FEA

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Chinese Journal of Mechanical Engineering 2006年第2期19卷 307-311页

作者： ZHANG Guoqing PU Gengqiang WANG Chengtao Life Quality and Mechanical Engineering Institute Shanghai Jiaotong UniversityShanghai 200030 China

S-N curve and fatigue parameters of 48MnV are obtained using small sample tests and staircase or up and down method, which paves the way for predicting fatigue life of crankshaft made of 48MnV. The fatigue life of the crankshaft of a six-cylinder engine is calculated using different damage models such as S-N method, normal strain approach, Smoth-Watson-Topper （SWT）Bannantine approach, shear strain approach, and Fatemi-Socie method based on dynamic simulation and finite element analysis （FEA） of crankshaft. The results indicate that the traditional calculation is conservative and the residual fatigue life of crankshaft is sufficient to maintain next life cycle if the crankshaft is remanufactured after its end of life.

关键词： 48MnV Multiaxial fatigue Crankshaft Dynamic simulation Finite element analysis （FEA）