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Fracture failure analysis of Fiber Reinforced Composites T-joints

IOP Conference Series: Materials Science and engineering 2017年第1期207卷

作者： Wei Su De-zhi Kong Ren-huai Liu Shi-qing Huang Science and 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

This paper discusses staple FRP T-joints on the project based on the classical beam theory of Euler-Bernoulli and a theoretical model of energy release rate is set up to discuss fracture propagation of composite T-joints. The paper is further analysis on fracture failure affected by composite pane depth and joints chamfer dimension parameters and so on. The conclusion benefit for extensive use of projects is also summarized.

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Structural damage detection and moving force identification based on firefly algorithm 6th

Structural damage detection and moving force identification ...

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6th International Conference on Swarm Intelligence, ICSI 2015 held in conjunction with the 2nd BRICS Congress on Computational Intelligence, CCI 2015

作者： Pan, Chudong Yu, Ling Department of Mechanics and Civil Engineering Jinan University Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China

ISBN: (纸本)9783319204659

Based on firefly algorithm (FA), a structural damage detection (SDD) and moving force identification (MFI) method is proposed in this paper. The basic principle of FA is introduced, some key parameters, such as light intensity, attractiveness, and rules of attraction are defined. The moving forcesinduced responses of damage structures are defined as a function of both damage factors and moving forces. By minimizing the difference between the real and calculated responses with given damage factors and moving forces, the identified problem is transformed into a constrained optimization problem and then it can be hopefully solved by the FA. In order to assess the accuracy and the feasibility of the proposed method, a three-span continuous beam subjected to moving forces is taken as an example for numerical simulations. The illustrated results show that the method can simultaneously identify the structural damages and moving forces with a good accuracy and better robustness to noise. © Springer International Publishing Switzerland 2015.

关键词： Structural health monitoring

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An improved PSO-NM algorithm for structural damage detection 6th

An improved PSO-NM algorithm for structural damage detection

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6th International Conference on Swarm Intelligence, ICSI 2015 held in conjunction with the 2nd BRICS Congress on Computational Intelligence, CCI 2015

作者： Chen, Zepeng Yu, Ling Department of Mechanics and Civil Engineering Jinan University Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control In Engineering Jinan University Guangzhou510632 China

ISBN: (纸本)9783319204659

A hybrid particle swarm optimization (PSO) combined with an improved Nelder-Mead algorithm (NMA) is proposed and introduced into the field of structural damage detection (SDD). The improved NMA chooses parts of subplanes of the n-simplex for optimization, a two-step method uses modal strain energy based index (MSEBI) to locate damage firstly, and both of them can reduce the computational cost of the basic PSO-Nelder-Mead (PSO-NM). An index of solution assurance criteria (SAC) is defined to describe the correlation between the identified and actual damage of structures. Numerical simulations on a 2-storey frame model is adopted to assess the performance of the proposed hybrid method. The illustrated results show that the improved PSONM can provide a reliable tool for accurate SDD in both single and multiple damage cases. Meanwhile, the improved PSO-NM algorithm has a good robustness to noises contaminated in mode shapes. © Springer International Publishing Switzerland 2015.

关键词： Strain energy

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Study on prediction for fracturing operation noise and impact assessment

Study on prediction for fracturing operation noise and impac...

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2016 IEEE International Conference of Online Analysis and Computing Science, ICOACS 2016

作者： Jingcheng, Liu Junlong, Jiang Lin, Mei Jumei, Liu Yu, Wang Institute of Petroleum and Gas Engineering Chongqing University of Science and Technology Chongqing China School of Aerospace Mechanical and Manufacturing Engineering RMIT University VIC Australia Chongqing Gas Field-Southwest Oil and Gas Field Branch Petro China Company Limited Chongqing China Key Lab. for Exploitation of China Southwestern Resources and Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing China Research Institute of Safety and Environmental Protection and Technology Supervision Petro China Company Limited Chengdu China

ISBN: (纸本)9781467377546

Fracturing is one of the key stimulation treatment techniques with wide application prospect for oil-gas well and is a kind of main form of natural gas exploitation currently, which is especially important for development of shale gas. However, the noise generated in the process of fracturing operation may impact the site operators and residents in the periphery. The typical fracturing operation process is selected in this paper to implement the actual measurement of noise and record such relevant parameters as operation condition and ambient environment. Based on the computation method of outdoor acoustic transmission attenuation, Cadna/A ambient noise simulation software is utilized to establish the acoustic environment simulation simplification model for certain oil well fracturing operation, implement the simulation study for noise impact distribution condition in the process of fracturing operation construction and perform the contrastive analysis for actually-measured value on the site. The result shows that the site operator's contact noise value is higher than the occupational exposure limit in National Occupational Sanitary Standard GBZ 2.2-2007 Occupational Exposure Limit for Harmful Factors in Workplace and the noise produced during operation in the daytime doesn't meet the emission limit in National Standard GB 12348-2008 Emission Standard for Ambient Noise at the Boundary of Industrial Enterprise. Therefore, in combination with the actual fracturing operation, the reasonable noise prevention and control measures are proposed. The study result of this paper has certain reference value for prediction and assessment of fracturing operation noise. © 2016 IEEE.

关键词： forecasting

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Elastoplastic analysis of tunnel surrounding rocks based on the statistical damage constitutive model

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Journal of engineering Science and Technology Review 2016年第3期9卷 27-34页

作者： Zhu, C.Q. Yin, Z.Q. Li, C.M. Feng, R.M. Anhui Province Key Lab. of Mining Response and Disaster Prevention and Control in Deep Coal Mine Anhui University of Science and Technology Huainan Anhui232001 China School of Resource and Safety Engineering Anhui University of Science and Technology Huainan Anhui232001 China Department of Mining and Mineral Resources Engineering Southern Illinois University Carbondale CarbondaleIL62901 United States

Accurately determining the stress status of surrounding rocks is difficult as stress in surrounding rocks is redistributed after tunneling. A constitutive model selection of surrounding rocks based on the pre-peak strain hardening characteristics of surrounding rocks is considered to further analyze the mechanical characteristics of tunnel surrounding rocks. Theoretical analysis and analytic calculation were conducted on the stress distribution and the deformation characteristics of tunnel surrounding rocks in this study. The evolution laws of stress, as well as the strain of the elastoplastic zone of tunnel surrounding rocks, and the plastic zone radius along with strain hardening and other relevant factors were also analyzed. Results show that, in view of strain hardening, the mechanical characteristics of surrounding rocks increasingly approaches that of reality and the plastic zone radius achieved is larger than the result of the Kastner solution. Moreover, when the strain hardening stage is shortened, the plastic zone radius initially decreases and then slightly increases;tangential strain and displacement increase in varying degrees as the radial strain gradually decreases;tangential stress peak gradually increases and the sudden change of its distribution curve becomes increasingly evident although radial stress changes are less obvious;and sensitivity of the radius and displacement of the surrounding rock plastic zone that support resistance increase with the increase in mining depth. As a result, the research findings solve, to a certain degree, the problem that the constitutive model of surrounding rocks failed to reflect the true characteristics of surrounding rocks, providing the theoretical foundation of stability analysis and supporting the design of tunnel surrounding rocks.

关键词： Strain hardening

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A novel two-step intelligent algorithm for damage detection of beam-like structures

A novel two-step intelligent algorithm for damage detection ...

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International Conference on Natural Computation (ICNC)

作者： Zepeng Chen Ling Yu Department of Mechanics and Civil Engineering Jinan University Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

A novel two-step intelligent algorithm is proposed for structural damage detection (SDD) by combining particle swarm optimization and Nelder-Mead (PSO-NM) algorithm, in which two steps are deployed for exploring a better balance between computational efficiency and accuracy. In the first step, a modal strain energy based index (MSEBI) is defined and used to precisely locate damages of structures. In the second step, structural damage extent is determined by PSO-NM algorithm. Some beam-like structures are adopted to assess its applicability. A parametric study and the effect of measurement noise on the method are also considered. The illustrated numerical simulation results show that the novel method can not only locate structural damage but also identify damage extent of beam-like structures with a good robustness to noises.

关键词： Optimization Shape Algorithm design and analysis Strain Computational efficiency Particle swarm optimization Indexes

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Comparative analysis of monetary and emergy dimension methods in calculating the payback period of photovoltaic (PV) curtain wall

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Energy Education Science and Technology Part A: Energy Science and Research 2014年第5期32卷 3269-3276页

作者： Ding, Likui Tang, Jian Jinan University Key Lab of Disaster Forecast and Control in Engineering Ministry of Education of the People’s Republic of China Guangzhou Guangdong China

In this study, method of monetary dimension considering the energy consumption difference and without considering the energy consumption difference are used to calculate the payback period of PV curtain wall;Besides the emergy dimension method is also introduced to calculate the payback period. An example is studied by the above methods. Comparative analysis shows that the payback period of PV curtain wall calculated by the monetary dimension method considering the energy consumption difference is shorter than that does not consider the energy consumption difference. Among them the payback period of PV curtain wall calculated by the method of emergy dimension is the shortest. The main reason for this is that the emergy dimension method analyzes an ideal condition which doesn’t include human factors while those factors exist in monetary dimension method. Taking the energy consumption difference into consideration in the calculation of the payback period of PV curtain wall makes the calculation more scientific, and the emergy dimension analysis illustrates the broad prospects for the development of PV curtain wall. © Sila Science. All rights reserved.

关键词： Energy utilization

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Molecular dynamic simulation of the mechanical properties of PI/SIO2 nanocomposite based on materials studio

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Journal of Chemical and Pharmaceutical Research 2014年第6期6卷 1534-1539页

作者： Mo, Yuzhen Zhang, Hui Xu, Jiachu Department of Mechanics and Civil Engineering Jinan University Guangzhou China Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Jinan University Guangzhou China

The initial unit cell models of PI/SiO2Nanocomposite and pure polyimide were built by Materials Studio, the stiffness matrix and mechanical parameters such as Young modulus, shear modulus, bulk modulus and Poisson ratio of the unit cells were achieved after molecular dynamic (MD) optimizations and calculations. Finally, the mechanical properties of pure polyimide and the PI/SiO2 nanocomposite with 5vol.% and 10vol.% nanosilica were compared. The result shows that the mechanical properties of polyimide can be remarkably reinforced by being filled with a low volume faction of silica-nanoparticle. © 2014, Journal of Chemical and Pharmaceutical Research. All rights reserved.

关键词： Nanocomposites

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Nonlinear characteristics of pendulum model with negative stiffness suspension

Nonlinear characteristics of pendulum model with negative st...

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第十五届全国非线性振动暨第十二届全国非线性动力学和运动稳定性学术会议

作者：李媛萍 CHEN Si-yu Key Lab of Disaster Forecast and Control in Engineering Ministry of Education of the People's Republic of China(Jinan University) Department of Mechanics and Civil Engineering Jinan University State Key Laboratory of High Performance Complex Manufacturing Central South University

Vibration and noise are important engineering problem and many methods have been developed to control and/or absorb the *** to now,there are a number of strategies to control the response of a system such as passive control,active control,semi-active control and hybrid *** achieve perfect performance of target system,the structures or mechanical systems should be designed to suit for different types of loading such as particularly dynamic and transient loads,and to obtain high static stiffness resulting in a small static deflection and a small dynamic stiffness resulting in a low natural *** mainaim of this paper is to improve the nonlinear pendulum system with negative stiffness suspension element with external excitation,and to explore the bifurcation and chaos characteristics contained in the pendulum *** governing equations of pendulum are derived by Lagrange *** analyze the bifurcation of nonlinear response of pendulum system,the phase portrait and bifurcation diagram are obtained ***,the Floquet multipliers are obtained by solving the perturbation equation with original equation with numerical *** results show that the main responses of pendulum system are periodic,and through saddle node bifurcation the system come into chaotic *** parametric resonance may occur when the excitation frequency closed to the natural frequency at vertical direction of whole *** variation of stiffness and excitation frequency has a large influence on the performance of the pendulum,and the amplitude of excitation may deduce unbounded motion in the resonance region.

关键词： Pendulum Bifurcation Floquet multiplier chaotic motion Suspension

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Crack analysis of bridge piers of a rail transit line in Guangzhou city

Crack analysis of bridge piers of a rail transit line in Gua...

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2014 2nd International Forum on Mechanical and Material engineering, IFMME 2014

作者： Chen, Mu Xue, Jiang Hong Department of Mechanics and Civil Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632 China

ISBN: (纸本)9783038350798

In order to study the bridge of a rail transit line in Guangzhou city, we use the finite element program Midas/FEA. Combining with the structure characteristics of the bridge, we establish space finite element model of piers. The linear and nonlinear analysis have been done respectively. In view of the nonlinear analysis, we analyze the left and right bearing under the most unfavorable load and dead load. The results show that as the ordinary reinforced concrete structure, bridge piers are bending crack under the design load. The width of crack controlled by force is less than the design value, so the bridge piers are in a safe state and it does not affect the normal operation. We noticed that the crack in piers appear a feature that width of crack become narrow in points under force controlling, but in other areas the crack in piers appear a feature that width of crack become wide. We have a preliminary judgment that the cause of this phenomenon may be the construction quality such as the actual reinforced protective layer are excessive, cooling measures in the process of the construction of the pier head of mass concrete did not reach the designated position, maintenance measures were in place and so on. The construction quality cause combined effects of mass concrete shrinkage crack and the structure of normal stress fracture. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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