Advances in Fracture and Materials Behavior

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Authors: Wen Lei Sun, Yi Fang Zhong, Yan Hua Huang
Abstract: RE is the generic name of a series of technical methods that convert physical parts into engineering concepts and CAD model. It has been an important branch of modern design methodology. With the development of computer and graphic design, RE has already no longer met the simple imitation products, but product innovation based on physical parts. In order to redesign the CAD model constructed by RE method and then support product innovation, hybrid CAD modeling method and some related key techniques are studied in this paper. Combining conventional design and RE, Hybrid CAD modeling method extracts features, constraints, and design intent from measured data for parametric redesign and eventually completes CAD model.
Authors: Hong Jiang, Wen Lei Sun, Yan Hua Huang
Abstract: The algorithm to obtain intersecting lines from section and equidistance surface is one method of resolving the problem of obtaining NC machining procedure from points cloud data. As far as cutter paths obtained by section method are concerned, if intersecting lines using tangent plane and processed curved surface are obtained directly, it will be a quite complicated process and lead to divergent iteration operation because of inconsiderate design algorithm, and therefore it leads to the failure of obtaining intersecting lines. So the method of obtaining intersecting lines from section and equidistance surface is adopted. And this paper put forward and has realized one new algorithm. The calculation is simple and the algorithm is stable. It avoids the interference of cutting tool paths.
Authors: Muhetaer Kelimu, Antoine Saab, Tan Tran, Marc Thiriet
Abstract: The study has been carried out in the framework of heart perfusion. The myocardium is usually irrigated by two coronary arteries, the entries of which are located in the Valsalva sinuses of the aortic root, slightly above the open leaflets of the aortic valve. The present investigation is aimed at determining a representative model of the thoracic aorta, especially of its ascending segment with the aortic valve and the coronary arteries, as well as the aortic arch, which commonly gives rise to three main branches irrigating the upper body parts, and the descending aorta. The model is developed using a CAD software and then meshed. Finally, steady flow simulations are performed using the CFD solver Fluent.
Authors: Akenjiang Tuohuti, Guo Qing Qi, Dun Wang
Abstract: Three different kinds of abode wall and composite abode wall in thickness are calculated with elastic-plastic FEM. Lateral resistance capacities, crack shapes as well as ductility of abode wall,of composite wall are analyzed. Based on them, simplified formula is put forward for calculating the lateral resistance capacities of composites abode wall, which provides a basis for the design of composite abode wall. In addition, seismic effects of composites abode wall under different earthquake levels,i.e:frequent intensity, basic and rare intensity are estimated. It indicates that traditional abode wall with timber columns and beams can satisfy the criterion of rare earthquake for seismic zone 9. It also shows that the research can be used as the provision for the transformation and seismic reinforcement of traditional residential buildings in Xinjiang.
Authors: Zhi Gang Yao, Rahmatjan Imin, Mamtimin Gheni
Abstract: This article presents the gear modeling method in dynamic mechanical analysis using SPH (Smoothed Particle Hydrodynamics) analysis method. The parameter equations of the transition curve of gear root and the other parts of gear are decided. The 3D discrete particles model is established based on the parameter equations. The SPH pre-process program of global and local dividing is developed. The error between the divided discrete particles and theoretical profiles of the gear has been analyzed. The analysis results show that this modeling method is a relatively better method and the correct SPH discrete particles can be divided by this method.
Authors: Ji Chao Sun, Guang Qian Wang, Quan Chen Gao
Abstract: The research about seepage of RSA is little, but the material is familiar. There are many difficulties in laboratory research about the materials, so numerical simulation research in the paper is introduced. The model of the random structure about SRA is set up, and then the study of seepage is given. The conversion of the two boundaries is solved correctly in the computer program. So some conclusions are drawn that the rock blocks the seepage to some degree, and the changing of RSA seepage is little under the effect of the fluctuating of rainfall intensity, namely the changing of the seepage is less than the fluctuating of rainfall intensity. The study is the foundation of the next study about the coupled of stress and seepage of RSA.
Authors: Ying Li, Xi Shu Wang
Abstract: In this work, the microstructure of the dragonfly wing vein was investigated by the finite element method (FEM). It is a bionic view to simulate the microstructure of the wing vein, which could be used to construct the micro air vehicles (MAVs). From the FEM results, the sandwich structure of the dragonfly wing vein was proved, which could supply more torsional deformation and reduce the weight of dragonfly. And the protein layer in the sandwich structure almost not bear the bending loadings, which could protect the protein not to be destroyed. It could assist us to utilize such design for the new micro air vehicle (MAV), especially ornithopter.
Authors: Gabriela Maria Atanasiu, Florin Leon, Bogdan F. Popa, Cornel Doniga
Abstract: This paper deals with the monitoring and assessment of structural performance of reinforced concrete residential buildings damaged during the lifetime by several important natural disasters such as earthquakes. The problem belongs to the risk management of built environment areas subjected to various natural catastrophes. In our work, we present a methodology based on modeling, simulation and nonlinear analysis applied on two classes of existing buildings located in the damaged infrastructure of earthquake sensitive cities. The decisions for risk mitigation taking into account the real seismic vulnerability of structures are based on GIS (Geographical Information Systems) mapping, and application of some artificial intelligence techniques. Finally, our paper discusses a new methodology for awareness and mitigation of seismic effects in case of future events in dense urban areas based on a case study for Iasi city, Romania.
Authors: Jie Hu, Xi Nong Zhang, Shi Lin Xie
Abstract: This paper utilizes Genetic Programming(GP) and Genetic Algorithm(GA) to analyze experiment data. The purpose of this research is to establish a function model of the data. The core methodology of this research is using GP to get the approximate model first, and then optimizes the parameters and enhance the fitness value of the model by using GA. To validate this method, two examples are given: one is the reconstruction of permeability-strain equation of the rock in literature[1]; another example is the function search automatically of the wire cable isolator experiment data. In the process of programming of parse tree, this paper adopted a new way that different from three traditional methods, the parse tree is described by matrix of special size, more significantly, this new method makes the genetic operation of crossover and mutation intuitionstic, even the pellucid Matlab programming language could implement it.
Authors: Abdul Rahim Ismail, Rosli Abu Bakar, Semin Ali, Ismail Ali
Abstract: Study on computational modeling of 4-stroke single cylinder direct injection diesel engine is presented. The engine with known specification is being modeled using one dimension CFD GT-Power software. The operational parameters of the engine such as power, torque, specific fuel consumption and mean effective pressure which are dependent to engine speed are being discussed. The results from the simulation study are compared with the theoretical results to get the true trend of the results.

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