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fatigue analysis of piezoelectric microdevice based on a continuum damage model

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International Journal of Smart and Nano Materials 2013年第3期4卷 179-198页

作者： Xianqiao Wang Ken P.Chong College of Engineering University of GeorgiaAthens 30606GAUSA Department of Mechanical and Aerospace Engineering George Washington UniversityWashington 20052DCUSA

The utilization of piezoelectric materials in MEMS devices under harsh environments has gained affordable appreciations due to its unique mechanical and electrical material ***,the reliability of MEMS devices triggered by fatigue damage remains elusive and needs to be further ***,we present a continuum constitutive model for piezoelectric materials containing a substantive amount of randomly dispersed *** constitutive equation of the piezoelectric materials with microcracks is formulated via Helmholtz free energy by combining the Kachanvo damage evolution law and the Chaboche fatigue damage development to express the fatigue damage growth.A case of the fatigue damage analysis of the piezoelectric microplate with transverse matrix cracks in the status of plane stress is presented by adopting the von Karman’s plate *** numerical schemes employed,the effect of cyclic impulsive loadings and electrical loadings on the fatigue damage and fatigue life prediction of a piezoelectric microplate is investigated and *** findings provide valuable insights into the fundamental mechanism of reliability in piezoelectric MEMS devices due to cyclic loadings,thereby offering new ways to exploit and fabricate the piezoelectric-based MEMS devices suitable for harsh conditions.

关键词： piezoelectric microplate constitutive equation fatigue analysis MEMS cyclic loading

fatigue analysis of Liquefied Petroleum Gas Cylinders for Safety Risk Assessment

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Journal of Shanghai Jiaotong university(Science) 2020年第3期25卷 394-397页

作者： ZHOU Feng LIU Haotian LA Jiankai School of Mechanical Engineering Dalian Jiaotong UniversityDalian 116028LiaoningChina

With the widespread application of liquefied petroleum gas (LPG),the safety of LPG cylinder has received more and more *** the safety of LPG cylinder,we conduct a safety risk assessment of cylinder using the failure mode and effect analysis (FMEA) *** the most influential inflatable fatigue under normal conditions as the research object,we use FE-safe software to analyze the fatigue *** risk compliance coefficients of various failure modes are calculated and classified according to the risk *** this way,the service life of the LPG cylinder weld is *** presented method improves the safety risk assessment process of LPG cylinder and provides a good theoretical and practical basis for similar pressure vessel risk assessment.

关键词： liquefied petroleum gas(LPG)cylinder safety risk assessment failure mode and effect analysis(FMEA) fatigue analysis

Ice-Induced fatigue analysis by Spectral Approach for Offshore Jacket Platforms with Ice-Breaking Cones

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China Ocean Engineering 2007年第1期21卷 1-10页

作者：岳前进刘圆张日向屈衍王瑞学 State Key Laboratory of Structural analysis of Industrial Equipment Dalian University of Technology School of Civil and Hydraulic Engineering Dalian University of Technology

The spectral methods and ice-induced fatigue analysis are discussed based on Miner＇s linear cumulative fatigue hypothesis and S-N curve data. According to the long-term data of full-scale tests on the platforms in the Bohai Sea, the ice force spectrum of conical structures and the fatigue environmental model are established. Moreover, the finite element model of JZ20-2MSW platform, an example of ice-induced fatigue analysis, is built with ANSYS software. The mode analysis and dynamic analysis in frequency domain under all kinds of ice fatigue work conditions are carded on, and the fatigue life of the structure is estimated in detail. The methods in this paper can be helpful in ice-induced fatigue analysis of ice-resistant platforms.

关键词： ice-resistant platform spectral methods ice force spectrum fatigue analysis

Computationally Efficient Approaches to fatigue analysis of Deepwater Risers

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Journal of Shanghai Jiaotong university(Science) 2013年第4期18卷 493-499页

作者：董磊磊张崎黄一刘刚 School of Naval Architecture Dalian University of Technology

Riser long-term fatigue performance is an important design consideration. Although extensive application of irregular sea analysis in time domain with the rainflow counting technique for post-processing is regarded as the most accurate of the approaches for fatigue analysis, it does suffer from some limitations, such as the computational effort. For this reason, two computationally efficient approaches are employed to perform the fatigue analysis of a deepwater top-tensioned riser, based on the Longuet-Higgins distribution and time domain scaling respectively. With Longuet-Higgins distribution irregular wave sea states are expanded into their individual wave bins. These regular wave simulations are of short duration and consequently run quickly. Using the time domain scaling technique, the number of irregular wave runs can be performed for a comparatively small number of load cases and hence reduces the calculation time. The results showed a reasonable accuracy and significant efficiency for both approaches, compared with those from the equivalent rainflow analysis. With much less computational effort and disk storage requirement, the approaches outlined in this paper can therefore be used for the fatigue assessment of deepwater risers in industry practice.

关键词： Longuet-Higgins distribution time domain scaling deepwater riser fatigue analysis

Research of Springing and Whipping Influence on Ultra-Large Containerships' fatigue analysis

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Journal of Shanghai Jiaotong university(Science) 2018年第3期23卷 429-437页

作者： REN Huilong ZHANG Kaihong LI Hui College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China

Rules of Classification Societies all around the world have made changes on design wave loads' value and fatigue influence factor modification due to the influence of springing and whipping on ultra-large *** paper firstly introduced 3-D linear hydroelastic theory in frequency domain and 3-D nonlinear hydroelastic theory in time domain, considering large amplitude motion nonlinearity and slamming force due to the severe relative motion between ship hull and wave. Then the spectrum analysis method and time domain statistical analysis method were introduced, which can make fatigue analysis under a series of standard steps in frequency and time domain, respectively. Finally, discussions on the influence factor of springing and whipping on fatigue damages of 8500 TEU and 10000 TEU containerships with different loading states were made. The fatigue assessment of different position on the midship section was done on the basis of nominal stress. The fatigue damage due to whipping can be the same as the fatigue damage due to springing and even sometimes can be larger than the springing damage. Besides, some suggestions on calculating load case selection were made to minimize the quantity of work in frequency and time domain. Thus, tools for fatigue influence factor modification were provided to meet the demand of IACS-UR.

关键词： springing whipping fatigue analysis hydroelasticity

Virtual vibration test rig for fatigue analysis of dozer push arms

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International Journal of Mechanical System Dynamics 2024年第3期4卷 278-291页

作者： Lei Hou Weibin Li Wenyan Gu Zizheng Sun Xiangqian Zhu Jin-Hwan Choi Key Laboratory of High-Efficiency and Clean Mechanical Manufacture of MOE National Demonstration Center for Experimental Mechanical EngineeringSchool of Mechanical EngineeringShandong UniversityJinanChina Rizhao Research Institute of Shandong University RizhaoChina School of Aerospace Engineering Xiamen UniversityXiamenChina School of Qilu Transportation Shandong UniversityJinanChina Department of Mechanical Engineering Kyunghee UniversitySeoulSouth Korea

To obtain accurate fatigue life results for construction machinery components,acquiring load spectra is crucial,as their authenticity and validity directly determine the precision of the *** working conditions,component attitudes change continuously,but they remain static on the vibration test rig(VTR),so the acquired target signals should match with the actual component attitudes in the driving signal *** paper proposes an efficient and economical simulation-based virtual VTR for fatigue analysis of ***,the relationship between the push arm rotation angle and the cylinder stroke is established,since the cylinder strokes can be measured easily in data acquisition ***,load decomposition is used to determine the attitude relationship between virtual VTR conditions and actual conditions,and target signals are calculated based on this attitude relationship and measured *** to the system's frequency response function,the driving signals are iterated until the system's response signals converge with the target ***,the iteratively obtained load spectra are utilized for fatigue life *** results show that the virtual VTR can effectively and accurately obtain the results of fatigue analysis and has engineering application significance.

关键词： virtual vibration test rig driving signal generation component attitudes fatigue analysis dozer push arm

fatigue analysis of Car Body Structure Based on Transient Response

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Fatigue Analysis of Car Body Structure Based on Transient Re...

fatigue analysis of Steel Catenary Risers Based on a Plasticity Model

2016中国汽车工程学会年会暨展览会

作者： Wang Pengbo Changan Auto R＆D Center Changan Automobile Co.Ltd.

ISBN: (纸本)9789811035272;9789811035265

fatigue simulation is executed for a car *** spectra are collected by real- vehicle test on enhanced road surfaces,and the load history for each intereface point is acquired by using multibody dynamics virtual *** on a finite element model and the mode superposition method,transient response of the car body is *** the stress history is obtained using the modal stress recovery *** S-N method is applied to predict fatigue damage distribution of the full car *** the fatigue analysis,material Haigh diagrams are defined to introduce the mean stress influence and critical cutting plane method is applied to treat the multi-axial *** on the presented numerical scheme,fatigue analysis and structural improvement for the car body can be carried out at the earlier stage of the vehicle development project.

关键词： car body road loading spectra transient response mode superposition method fatigue analysis

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Journal of Marine Science and Application 2015年第1期14卷 76-82页

作者： Yongqiang Dong Liping Sun College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China

The most critical issue in the steel catenary riser design is to evaluate the fatigue damage in the touchdown zone accurately. Appropriate modeling of the riser-soil resistance in the touchdown zone can lead to significant cost reduction by optimizing design. This paper presents a plasticity model that can be applied to numerically simulate riser-soil interaction and evaluate dynamic responses and the fatigue damage of a steel catenary riser in the touchdown zone. Utilizing the model, numerous riser-soil elements are attached to the steel catenary riser finite elements, in which each simulates local foundation restraint along the riser touchdown zone. The riser-soil interaction plasticity model accounts for the behavior within an allowable combined loading surface. The model will be represented in this paper, allowing simple numerical implementation. More importantly, it can be incorporated within the structural analysis of a steel catenary riser with the finite element method. The applicability of the model is interpreted theoretically and the results are shown through application to an offshore 8.625 steel catenary riser example. The fatigue analysis results of the liner elastic riser-soil model are also shown. According to the comparison results of the two models, the fatigue life analysis results of the plasticity framework are reasonable and the horizontal effects of the riser-soil interaction can be included.

关键词： steel catenary riser fatigue analysis riser-soil interaction plasticity model finite element method

fatigue analysis of Truck Frame Using Virtual Proving Ground

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Fatigue Analysis of Truck Frame Using Virtual Proving Ground