Papers by Keyword: Material Selection

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Authors: Shi Gang Chao
Abstract: The selection of the most desirable material contains many evaluation attributes, and thus leads to hard be solved. The material selection is actually a multiple attributes decision making problem, which has been studied by many authors. The aim of this study is to propose a new material selection method, which is an improved double base points method through defining the entropy weight and used the relative approach degree to measure the distance measures. The method may avoid the influence of subjective factors through the entropy weight, is very suitable for material selection problem. The applied example proves that the method is both effective and exercisable.
Authors: Sheng Bin Wu, Xiao Bao Liu
Abstract: A new method for material selection in structure design based on the theory of the finite element method was presented. The method made material selection and structure design working at the same time. The mathematical model was established based on the finite element method. Finally, the material selection of an excavator's boom was verified, the results show that the proposed method is effective and feasible.
Authors: Liang He, Wan Lin Guo
Abstract: Material selection in mechanical products based on total life cycle design is a complicated work, which should be studied systematically. A material selection model of mechanical products based on total life cycle design was proposed. A set of candidate materials were screened out, and then assessed according to the technical, economic and environmental assessment index. The candidate materials were ranked by using by using Z-transformation method in each of the assessment index. Different weights were assigned to each of the three assessment indexes, and global assessment was carried out according to different strategies or requirements which pay more attention to technical, economic or environmental performance of the material product used. A case in selecting aircraft structure element material was studied. The analysis results showed that the method could rank the candidate materials and selected out the “optimized material”, and the influence of the subjectivity of designer was reduced. The method provides some practical values for preliminary material selection in the early design stage of the mechanical products based on life cycle design.
Authors: S.M. Mizanoor Rahman
Abstract: This paper presents the analysis of electro-mechanical design, selection of materials and manufacturing techniques for physical construction, dynamics, control etc. of a novel variable impedance compact compliant series elastic actuator (SEA) for human-friendly robotics applications. The electro-mechanical design consists of a servomotor, a ball screw, a torsional spring connecting the servomotor and the ball screw via a pair of spur gear, and a set of translational springs connecting the ball screw nut to the output link. The translational springs have low stiffness and these are used to handle low force operations that reduce non-linear friction, output impedance, impact etc. The torsional spring is in the high speed range, has high effective stiffness and it enhances the system bandwidth for large force operations when the translational springs are fully compressed. Suitable materials and appropriate manufacturing techniques for the construction of the actuator are discussed. Kinematics and working principle of the actuator are analyzed. The actuator model is simulated on the physical implementation for dynamics and control for different conditions. Simulation results prove satisfactory performances of the design. Then, advantages of the design over its existing counterparts are discussed, and its potential applications and future extensions are mentioned.
Authors: Wen Li Li
Abstract: Through a highway asphalt pavement condition survey and analysis of the main causes of disease, through material selection and grading design, the design of the treatment structure, class structure using the drainage layer, exclude the internal structure of the water surface; focused on solving the asphalt pavement water damage issues, effectively extending the life of the highway.
Authors: Wei Fan Huang
Abstract: Material selection problem becomes an important issue in the material science field. It is important for design for mechanical, electrical, thermal, chemical et al. There are several influencing factors in the material selection process, and thus material selection problem is a multi-criteria decision making (MCDM) problem. Relative entropy measure can depict the closeness of the two systems, and then this paper will use it to develop an improved TOPSIS method for the material selection problem. Finally, a practical example is given to demonstrate that the proposed method is effective and feasible.
Authors: Hua Jun Cao, Fei Liu, Cong Bo Li, Chun Liu
Abstract: Materials have very important influence on the environmental impact of the product life cycle from production to disposal and recycling. The environmental factors should be considered when product materials are selected, in order to improve the environmental friendliness of products. Due to the complexity of product material selection considering technical, economic and environmental factors, it is transformed into a decision-making problem. An integrated decision-making index system is presented, and a multi-objective decision-making framework model is established according to the index system. An algorithm integrating grey relation analysis (GRA) and analytic hierarchy process (AHP) is used to aid the decision making process. A material selection case of the housing of an electronic device is introduced, which shows the feasibility and effectiveness of the model and method presented.
Authors: S. Kumar, R. Singh
Abstract: This paper presents an intelligent system for modeling and material selection for progressive die components. The proposed system comprises of two modules, namely INTPMOD and MATSEL. The first module INTPMOD is constructed for modeling of die block, stripper plate, punch plate, back-up plate, die-set and die assembly of progressive die automatically in the drawing editor of AutoCAD. The second module MATSEL is developed for material selection for progressive die components. Both the modules are coded in AutoLISP language and designed to be loaded into the prompt area of AutoCAD. An illustrative example is included to demonstrate the usefulness of the system modules. The proposed system is implemented on a PC having AutoCAD software and its low cost of implementation makes it affordable for small and medium-size sheet metal industries.
Authors: Chang Yun Liu, Xue Zeng Zhao, Fang Chen
Abstract: The constant flux blanking plug is a downhole flow control device used in the separate layer water injection system of oil-field, its flow characteristic and reliability are the most important matters that people care about. So these performances of the constant flux blanking plug are analyzed by numerical methods here. The dynamic model of the constant flux blanking plug is established by bond-graph, then the simulation is made by the 20-SIM software. The influence of local flow field is studied by CFD (computational fluid dynamics), with which some different valve spools and pockets are compared. The discrete particles’ trajectories are analyzed by the Lagrangian method, and the particle erosion rates of different materials are calculated with Bitter’s erosion model. All the simulation data show that the structure and material have great influence on the flow control precision and reliability which need to improve at present. The simulation results are verified through ground or field tests in the end.
Authors: Dušan Petković, Miloš Madić, Miroslav Radovanović, Predrag Janković
Abstract: It is well known fact that materials play an important role in engineering design. Nowadays over a hundred thousand available materials can be distinguished with constant tendency for increasing the novel designed materials. Therefore material selection process becomes a complex and time consuming task. Selection of the most suitable material for a given application can be regarded as a multi-criteria decision making (MCDM) problem with conflicting and diverse objectives. New MCDM methods have been developed, and existing methods improved, showing that research in the decision-making is important and still valuable. This paper describes the use of recently developed MCDM methods, i.e. Complex Proportional Assessment (COPRAS) and Weighted Aggregated Sum Product Assessment (WASPAS) for selecting the most suitable hard coating material.
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