Advances in Fracture and Materials Behavior

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Authors: Rabiya Nuer, Mamtimin Gheni, Mutellip Ahmat, Li Hua Jia
Abstract: This study has set up 3D model of Welded Metal Bellows Diaphragms with the Geometry module of MSC.Patran software, turn into the finite element and analyse models in MSC.Patran software , has carried on finite element analysis with MSC.Nastran under the loaded operating mode condition that is giving definitely, have received stress distributing and deformation situation of Diaphragms, has carried on optimization design to Diaphragms on this basis.
Authors: Halida Musha, Mamtimin Gheni, Buhalqam
Abstract: In this paper, the iBone (Imitation Bone) model which is coupled with Turing reaction-diffusion system and FEM, is used. The numerical simulation of bone forming process by considering the osteoclasts and osteoblasts process are conducted. The bone mass is increased with increase of the initial load value, then fibula and femur bones are obtained respectively by keeping the required bone forming value. The new S shape wave of metal welded bellow of mechanical seal are designed based on the the optimization results through this method. The S shape and V shape both were analyzed with FEM method. The same boundary conditions were given for two types of wave. The results are shown that the stresses mainly concentrated on the welded area. It is interesting that the value of the stresses of the two types of wave basically same. However, compressibility of the two types of wave is very different at the same computation stage. The compressibility of S shape wave was higher than V shape.
Authors: Wen Jun Qi, Jian Jiang Fang, Yuan Yuan Zhu, Yan Hua Huang
Abstract: Welding Continuous Cooling Transformation (CCT) graph reflects the relationship between microstructure, hardness of steel heat-affected zone (HAZ), weld and welding cooling rate continuous cooling from high temperature, and it is the basic to select welding material, determine the optimum welding technology, relieve welding cracks and lay down standard of past heat treatment. Welding technological parameters determine welding cooling rate, and the rate determines microstructure, hardness of steel HAZ and weld, therefore we can calculate microstructure according to known welding technological parameters and optimum parameters according to wanted properties based on CCT graph. The system combines CAD and welding techniques, the welding CCT graphs are made into drawing blocks at the platform of AutoCAD, the important data of welding CCT are made into database, they are transferred and managed by Access. Based on Active Automation techniques using Visual Basic, AutoCAD graph base are transferred and data of welding CCT can be inquired and dynamically added to the base. The system has realized the prediction of welding structure and properties and optimizing welding technology.
Authors: Chun Yao Wang, Yong Xie, Xue Nong Wang, Fa Cheng, Yue Liu, Yuan Kong Chun
Abstract: This paper carried on mechanics analysis and the research to the Curved Rake Tine Frame and Headstock of film recycling machine which could cut cotton stalk and recycle the used film simultaneously. This machine was developed by the Institute of Agriculture Machine Xingjiang Academy of Agricultural Sciences. This paper used servile methods to identify the structural deficiencies such as Visualization Virtual Design, Finite Element Method and Testing Method. These data provided a theoretical basis for the design of the Curved Rake Tine Frame and Headstock.
Authors: Ilham Abdureyim, Arkin Hamdulla, Mamatjan Tursun, Kalbinur Ahmat, Mamtimin Gheni
Abstract: The numerical controlled plastic film cutting machine in our design is used for flower bags making. It is composed of four parts; cutting mechanism, delivering mechanism, tool rest and machine bed. The tool rest is a critical structure to cutting and adhering operations. The tool rest is a long -thin rod with big span, usually it’s failure is because of bending deformation caused by less stiffness. In this study, we finished FEM 3D modeling of tool rest structure to increase its structure stiffness. We analyzed bending deformation characteristics of the tool rest, performed 3D FEM analysis and choose a relatively reliable structure after comparing maximum deformation in three different candidate structures. As a result, support structure of the tools rest was optimized, providing us a numerical data for structure reformation.
Authors: Bin Wang, Y. Gu, Hai Cheng Guo, Ai Kah Soh, Dai Ning Fang
Abstract: A novel method for characterizing a high actuating capability light-weight actuator is described and analyzed. The actuator comprises a truss core and smart face-sheets which result in bending. The deformation of this beam actuator is obtained by changing voltage inside face-sheets made from smart material. Materials selections are discussed for practice, and then optimization is designed to ascertain minimum weight or maximum achievable displacement subject to two types of constrains. Results show the composite trusses have higher stiffness and strength than metal trusses. Comparisons with two corrugated core actuators, the truss-core design has better actuating capability at specified weight.
Authors: Ying Hui Lu, Shui Lin Wang, Hao Jiang, Xiu Run Ge
Abstract: In geotechnical engineering, based on the theory of inverse analysis of displacement, the problem for identification of material parameters can be transformed into an optimization problem. Commonly, because of the non-linear relationship between the identified parameters and the displacement, the objective function bears the multimodal characteristic in the variable space. So to solve better the multimodal characteristic in the non-linear inverse analysis, a new global optimization algorithm, which integrates the dynamic descent algorithm and the modified BFGS (Brogden-Fletcher-Goldfrab-Shanno) algorithm, is proposed. Five typical multimodal functions in the variable space are tested to prove that the new proposed algorithm can quickly converge to the best point with few function evaluations. In the practical application, the new algorithm is employed to identify the Young’s modulus of four different materials. The results of the identification further show that the new proposed algorithm is a very highly efficient and robust one.
Authors: Hidetoshi Sakamoto, Kimihide Tsukamoto, Yoshifumi Ohbuchi, Hisahiro Inoue
Abstract: Authors tried to construct multimedia base support system of the manufacturing process with use of the knowledge base and the inference engine on the www server. This knowledge database systematized the knowledge which was obtained from the document and the skilled engineer as much as possible by using a knowledge engineering technique. However, it is difficult for beginner to find the best processing condition under the condition of the material, the machine and the tool on grinding operation by using the conventional database. Especially, when they encountered the manufacturing condition which is not built into the conventional data base, the past optimum conditions cannot be obtained from the expert system. The best method of obtaining the optimum conditions as the solution of this problem is to execute some experiments for this new case. This research proposed the system, which presented a minimum combination of the multi factor experiments for the best manufacturing condition search by using the Taguchi method. We were able to obtain the best condition to use the proposed robust engineering by only 18 times.
Authors: Hua Rui Liu, J.L. Yang
Abstract: This paper is addressed to the optimal control of the simply supported sandwich panel with pyramidal truss cores. Firstly, according to the sandwich theory proposed by Sorokin and Ershova, the eigenfrequencies of the sandwich panel are studied. Then based on the energy criterion, the weight coefficient matrix Q and R for the linear quadratic regulator method are obtained. By solving the Riccati equation, the displacement and control force are given. The curves for the displacement response at the center of the plate are shown. From the numerical results, it is found that this method is effective in suppressing the vibration of the sandwich panel with pyramidal truss cores.
Authors: Feng Xiong, Yi Ping Yuan, Yu Ying Wang, Guang Wen Wang
Abstract: In manufacturing Grid workflow, multiple tasks share a common and limited resource pool. In order to solve task scheduling in multi-process with resource constraints under MG workflow, the Task-Resource Constrained model is set up to descript the assignment relation between task and resource. The framework of the task scheduling and the scheduling policies are also presented that can readjust the tasks according to the priority rules and the time parameters in the process. Then we present a heuristic scheduling algorithm that includes multiple policies. The heuristic scheduling algorithm will update the critical path of DAG (Direct Acyclic Graph) and the beginning time of post-tasks. MG Workflow engine can dynamically schedule the resources according the task requirement. An example is given to illustrate the method at last.

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