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4th International Conference on Advanced Composite Materials and Manufacturing engineering (ACMME)

作者： Su, Wei Cheng, Ke-qiang Liu, Ren-huai Huang, Shi-qing China Elect Prod Reliabil & Environm Testing Res Sci & Technol Reliabil Phys & Applicat Technol El Guangzhou Guangdong Peoples R China Jinan Univ Dept Mech & Civil Engn Guangzhou Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou Guangdong Peoples R China

In this paper, we focus on the need for ideal theory analytical solution of mechanical deformation mechanism for T-joints. Through removing unnecessary constraints, stress equivalence system of T-joints can be established by force method. Solution equations of unknown nodal forces and the total vertical displacement can also be obtained, and this result can be used to evaluate strength of FRC T-joints.

关键词： Deformation

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A Simulation of Low and High Cycle Fatigue Failure Effects for Metal Matrix Composites Based on Innovative J₂-Flow Elastoplasticity Model

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MATERIALS 2017年第10期10卷 1126-1126页

作者： Wang, Zhaoling Xiao, Heng Weifang Univ Sch Math & Informat Sci Weifang 261061 Peoples R China Jinan Univ Sch Mech & Construct Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

New elastoplastic J(2)-flow constitutive equations at finite deformations are proposed for the purpose of simulating the fatigue failure behavior for metal matrix composites. A new, direct approach is established in a two-fold sense of unification. Namely, both low and high cycle fatigue failure effects of metal matrix composites may be simultaneously simulated for various cases of the weight percentage of reinforcing particles. Novel results are presented in four respects. First, both the yield condition and the loading-unloading conditions in a usual sense need not be involved but may be automatically incorporated into inherent features of the proposed constitutive equations;second, low-to-high cycle fatigue failure effects may be directly represented by a simple condition for asymptotic loss of the material strength, without involving any additional damage-like variables;third, both high and low cycle fatigue failure effects need not be separately treated but may be automatically derived as model predictions with a unified criterion for critical failure states, without assuming any ad hoc failure criteria;and, finally, explicit expressions for each incorporated model parameter changing with the weight percentage of reinforcing particles may be obtainable directly from appropriate test data. Numerical examples are presented for medium-to-high cycle fatigue failure effects and for complicated duplex effects from low to high cycle fatigue failure effects. Simulation results are in good agreement with experimental data.

关键词： metal matrix composites high and low cycle fatigue finite deformations new elastoplastic equations unified failure criterion direct simulation

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R-function theory method for free vibration of slip clamped trapezoidal shallow spherical shell 4th

R-function theory method for free vibration of slip clamped ...

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4th International Conference on Civil, Architectural and Hydraulic engineering, ICCAHE 2015

作者： Li, Shanqing Yuan, Hong MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou China

ISBN: (纸本)9781138029163

In this paper, the R-Function Theory (RFT) is applied to solve the free vibration of slip clamped trapezoidal shallow spherical shell. Firstly the fundamental solution of the biharmonic operator, the boundary equation and the R-function are used to construct the quasi-Green’s function. Then the model governing differential equation of the problem is reduced to the Fredholm integral equation of the second kind by Green’s formula. The singularity of the kernel of the integral equation is overcome by choosing a suitable form of the normalized boundary equation by the R-function. A numerical example shows that this method is an effective numerical method. © 2016 Taylor & Francis Group, London.

关键词： Numerical methods

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A hybrid self-adaptive Firefly-Nelder-Mead algorithm for structural damage detection

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SMART STRUCTURES AND SYSTEMS 2016年第6期17卷 957-980页

作者： Pan, Chu-Dong Yu, Ling Chen, Ze-Peng Luo, Wen-Feng Liu, Huan-Lin Jinan Univ Dept Mech & Civil Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

Structural damage detection (SDD) is a challenging task in the field of structural health monitoring (SHM). As an exploring attempt to the SDD problem, a hybrid self-adaptive Firefly-Nelder-Mead (SA-FNM) algorithm is proposed for the SDD problem in this study. First of all, the basic principle of firefly algorithm (FA) is introduced. The Nelder-Mead (NM) algorithm is incorporated into FA for improving the local searching ability. A new strategy for exchanging the information in the firefly group is introduced into the SA-FNM for reducing the computation cost. A random walk strategy for the best firefly and a self-adaptive control strategy of three key parameters, such as light absorption, randomization parameter and critical distance, are proposed for preferably balancing the exploitation and exploration ability of the SA-FNM. The computing performance of the SA-FNM is evaluated and compared with the basic FA by three benchmark functions. Secondly, the SDD problem is mathematically converted into a constrained optimization problem, which is then hopefully solved by the SA-FNM algorithm. A multi-step method is proposed for finding the minimum fitness with a big probability. In order to assess the accuracy and the feasibility of the proposed method, a two-storey rigid frame structure without considering the finite element model (FEM) error and a steel beam with considering the model error are taken examples for numerical simulations. Finally, a series of experimental studies on damage detection of a steel beam with four damage patterns are performed in laboratory. The illustrated results show that the proposed method can accurately identify the structural damage. Some valuable conclusions are made and related issues are discussed as well.

关键词： structural damage detection (SDD) firefly algorithm Nelder-Mead algorithm self-adaptive finite element model (FEM)

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Research on gas diffusion model and experimental diffusion characteristic of cylindrical coal

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Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology 2017年第5期46卷 1033-1040页

作者： Li, Zhiqiang Cheng, Qiang Liu, Yanwei Duan, Zhengpeng Song, Dangyu State Key Laboratory of Coal mine Disaster Dynamics and Control Chongqing University Chongqing400030 China Henan Polytechnic University JiaozuoHenan454000 China MOE Engineering Center of Mine Disaster Prevention and Rescue Henan Polytechnic University JiaozuoHenan454000 China Henan Provincial Key Lab of Gas Geology and Control-Cultivation Base of Provincial and Ministry Joint State Key Henan Polytechnic University JiaozuoHenan454000 China

Under various temperatures and pressures, the gas diffusion experiments were carried out with Φ50 mm×100 mm standard cylindrical coal samples. At the same time, a gas diffusion experiment was carried out by use of the particles of the same coal as comparative experiment. To describe the gas diffusion in cylindrical coal samples, the cylindrical diffusion model was established and the analytical solution of diffusion rate was derived. The results show that the gas diffusion in cylindrical raw coal is slower than that in coal particles. And the cumulative diffusion quantity and diffusivity in cylindrical raw coal is far less than those in coal particles under the same time. The diffusion coefficient of cylindrical raw coal is 11.72 times as much as that of coal particles. This is because that the cylindrical row coal contains a larger pore and fissure diamaters. But the effective diffusion coefficient of cylindrical raw coal is 1.82% of which in coal particles. That results from the extension of the diffusion path and the increase of the tortuosity. These lead the cylindrical coal core to contain a smaller capacity of release gas. © 2017, Editorial Board of Journal of CUMT. All right reserved.

关键词： Coal

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Thermal-Structural Coupling Analysis of PCBA System

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IOP Conference Series: Materials Science and engineering 2018年第2期452卷

作者： Wei Su Junhua Zhu Renhuai Liu Zhiyuan He Scienceand Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China Department of Mechanics and Civil Engineering Jinan University Guangzhou China

In this paper, the thermal and structural analysis of the PCBA system is provided by using the 3-D ANSYS package. The results of thermal and structural analysis for complex and simple model are compared. The paper also describes the deformation analysis of the PCBA system components, and the weak components sensitive to thermal stress are determined though thermal-structual analysis. The results of thermal analysis are helpful to the optimizing overall arrangement design of PCBA system.

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Identification of Joint Equivalent Parameters via Combining PSO with FE Model Updating 12

Identification of Joint Equivalent Parameters via Combining ...

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12th International Conference on Natural Computation, Fuzzy Systems and Knowledge Discovery (ICNC-FSKD)

作者： Luo, Wenfeng Yu, Ling Jinan Univ Dept Mech & Civil Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9781509040933

In this study, the finite element (FE) model updating method and particle swarm optimization (PSO) algorithm are combined to identify joint equivalent parameters by converting the inverse problem into an optimization problem. First, the natural frequency and frequency response function (FRF) of assembled structures are regarded as an index of the dynamic characteristics. The objective function is defined by minimizing index relative errors between FE model and assembled structures. And then the PSO algorithm is used to solve the optimization problem. The noise effect on the method is also considered. The illustrated numerical simulation results show that the proposed method can identify the equivalent parameters with a good robustness to noises as well as with a high efficiency.

关键词： bolted joints equivalent parameters finite element (FE) model updating particle swam optimization (PSO) frequency response function (FRF)

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Moving Force Identification based on Particle Swarm Optimization 12

Moving Force Identification based on Particle Swarm Optimiza...

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12th International Conference on Natural Computation, Fuzzy Systems and Knowledge Discovery (ICNC-FSKD)

作者： Liu, Huanlin Yu, Ling Jinan Univ Dept Mech & Civil Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9781509040933

Moving force is very important for bridge design, structural analysis and structural health monitoring. Some studies on moving force identification (MFI) attract extensive attentions in the past decades. A novel two-step MFI method is proposed based on particle swarm optimization (PSO) and time domain method (TDM) in this study. The new proposed MFI method includes two steps. In the first step, the PSO is used to identify the constant loads without matrix inversion. In the second step, the conventional TDM is employed to estimate the rest time-varying loads where the Tikhonov regularization and general cross validation (GCV) are introduced to improve the MFI accuracy and to select optimal regularization parameters, respectively. A simply supported beam bridge subjected to moving forces is taken as a numerical simulation example to assess the performance of the proposed method. The illustrated results show that the new two-step MFI method can more effectively identify the moving forces compared to the conventional TDM and the improved Tikhonov regularization method, the proposed new method can provide more accurate MFI results on two moving forces under eight combinations of bridge responses.

关键词： particle swarm optimization (PSO) moving force identification (MFI) time domain method (TDM) Tikhonov regularization general cross validation (GCV)

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Theory and calculation of stress transfer between fiber and matrix

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Applied Mathematics and Mechanics(English Edition) 2015年第6期36卷 815-826页

作者： Jiayu WU Hong YUAN Renhuai LIU MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University

For the better use of composites and a deeper insight into the fracture propa- gation and stress transfer of the interface between fiber and matrix, a theoretical solution of closed form is presented with the assumed bilinear local bond-slip law and a parabolic shear stress distribution along the thickness of the matrix. The load-displacement re- lationship and interfacial shear stress are obtained for four loading stages. Finally, the effects of Young＇s modulus of fiber （matrix） and bond length on the performance of the interface are illustrated.

关键词： shear-lag method composite material interfacial mechanics

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New damage-sensitive feature for structures with bolted joints

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Journal of Physics: Conference Series 2017年第1期842卷

作者： W F Luo L Yu School of Mechanics and Construction Engineering Jinan University Guangzhou 510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

Compared with riveted and welded joints, bolted joints have advantages of easily dismantled, high load carrying and load-transferring capacity. However, bolted joints are also weaker components of assembled structures. Structural damage detection (SDD) on bolted joints is much required in the field of structural health monitoring (SHM). A new SDD method is proposed for damage identification of structures with bolted joints based on residual error of AR model in time series analysis. Firstly, a new data standardization process is defined to maintain the information of damage location. Then, a new structural damage feature sensitive to structural damage is developed based on the standard deviation of AR model residual errors. To verify the proposed method, a bolted joint structure is designed and fabricated in laboratory, connection damages of structures are simulated by loosening the bolted joints. The acceleration responses of structures with bolted joints under healthy and damage cases are acquired. Finally, the SDD is performed by traditional DSF and the new DSF. The illustrated results show that the proposed method is a hybrid tool for the bolted joint damage detection with the new damage-sensitive feature. In addition, some related issues will be discussed as well.

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