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  • 1
    Electronic Resource
    Electronic Resource
    Effects of aging on epoxy-based rapid tooling materials (2002)
    Bingley : Emerald
    Rapid prototyping journal 8 (2002), S. 215-223 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study shows the effects of aging on epoxy-based rapid tooling materials. Two epoxy-acrylate resins used for stereolithography and one aluminum powder-filled epoxy used for the high-speed machining of plastic injection molds were selected to investigate their aging behavior in different environments. Four different conditions, each characterized by a specific relative humidity, were used to perform a seven week long aging study. Temperature was kept a constant at 30°C. Both the stereolithographic resins showed a drop in mechanical properties and in their glass transition temperatures in wet environments, whereas aging time showed little influence on these properties after an initial induction phase. Moisture uptake is mainly responsible for this drop and the coefficients of water diffusion were determined in this process. On the other hand, the aluminum powder-filled epoxy showed little humidity-dependent drop in mechanical properties and in its glass transition temperature during aging. A simple empirical model that only takes into account the moisture uptake was developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552540210441120
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  • 2
    Electronic Resource
    Electronic Resource
    A form verification system for the conceptual design of complex mechanical systems (1994)
    Springer
    Engineering with computers 10 (1994), S. 33-44 
    Details
    ISSN: 1435-5663
    Keywords: Automobile design ; Conceptual design ; Design system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract This paper presents a summary of research into the development and implementation of a domain-independent, computer-based model for the conceptual design of complex mechanical systems [1]. The creation of such a design model includes the integration of four major concepts: (1) the use of a graphical display for visualizing the conceptual design attributes: (2) the proper representation of the complex data and diverse knowledge reguired to design the system; (3) the integration of quality design methods into the conceptual design: (4) the modeling of the conceptual design process as a mapping between functions and forms. Using the design of an automobile as a case study, a design environment was created which consisted of a distributed problem-solving paradigm and a parametric graphical display. The requirements of the design problem with respect to data representation and design processing were evaluated and a process model was specified. The resulting vehicle design system consists of a tight integration between a blackboard system and a parametric design system. The completed system allows a designer to view graphical representations of the candidate conceptual designs that the blackhoard system generates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01206538
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  • 3
    Electronic Resource
    Electronic Resource
    Information frameworks for conceptual engineering design (1994)
    Springer
    Engineering with computers 10 (1994), S. 22-32 
    Details
    ISSN: 1435-5663
    Keywords: Conceptual design ; Database ; Frameworks ; Information management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract An information modeling approach is used to gain an understanding of the information and decision content of conceptual engineering design. Information frameworks are presented that attempt to represent the key decisions made during conceptual design. Elements of the frameworks are derived from results from design theory and methodology and decision theory. Using a number of products, the frameworks are demonstrated in simulated design situations. The models provide an explicit, generic and consistent perspective for identifying the information content of conceptual designs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01206537
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  • 4
    Electronic Resource
    Electronic Resource
    An integrated, intelligent design environment (1991)
    Springer
    Engineering with computers 7 (1991), S. 11-22 
    Details
    ISSN: 1435-5663
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract An integrated, intelligent design environment was designed and implemented. The heart of the environment is a userfriendly, menu-driven CAD system integrated with an information controller. The system allows the engineer to design in a feature-based, object-oriented manner. Designs are stored in a data base and checked for manufacturability and assembly by an expert system. This paper describes the design of the information integration controller and the man-machine interfaces of the intelligent design system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01208342
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  • 5
    Electronic Resource
    Electronic Resource
    The complementary roles of expert systems and database management systems in a design for manufacture environment (1992)
    Springer
    Engineering with computers 8 (1992), S. 139-149 
    Details
    ISSN: 1435-5663
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Effective product design that satisfies functional requirements and can be manufactured easily requires vast amounts of knowledge on the part of the design engineer. This paper focuses on the complementary roles of expert systems and database management systems as they relate to the Intelligent Design System (IDS) in a Design for Manufacture (DFM) environment. Each technology complements the other in its strengths and abilities. The database management system provides during the design process. The expert system provides a reasoning mechanism for identifying manufacturing violations and generating meaningful recommendations. These components work cooperatively with a CAD interface to form a unified, intelligent design environment. An information flow analysis of the Intelligent Design System resulted in the development of three distinct classifications of information within the database: CAD data, a design catalog, and a knowledge base. The CAD data tables employ an, object oriented approach to store specific information about the physical contains cost, weight, and strength characteristics of the standard parts and fasteners used within the system. The knowledge base contains rules and heuristics concerning design and manufacturing methodologies. The placement of the expert system rules in the database represents an innovation. As a result, the expansion and updating of the materials, fasteners, standard parts, or manufacturing processes used by the Intelligent Design System is facilitated without increased due to the efficient management of the knowledge base by the database management system. This allows the designer to modify the knowledge and help the system to learn without the need for a knowledge engineer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01200365
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal analysis of thermoplastic composites during processing (1995)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 16 (1995), S. 198-203 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Unsteady two-dimensional thermal analysis has been performed on PEEK/AS-4 fiber thermoplastic composites. To calculate the crystallinity of the composite, a spherulite growth model was applied. A numerical analysis was carried out with variations in mold cooling rate, the prepreg lay-up, and the composite geometry. The effect of geometry and the cooling rate is significant in the temperature profiles. The degree of crystallinity varies with the cooling rate, but the gradient of crystallinity is small, with the exception of complex geometries at fast cooling rates. The results of numerical calculations are in excellent agreement with the experiments and offer validation of the numerical formulation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750160303
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  • 7
    Electronic Resource
    Electronic Resource
    Microstructure-based processing parameters of thermoplastic composite materials. Part I: Theoretical models (1994)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 15 (1994), S. 34-41 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Processing parameters for composites are predicted by new models which are based on the microstructure of the composite. Three types of termoplastic prepregs are considered, ICI tape, BASE commingled two, and CCMI powder coated tow. The permeability of the composites depends on their fiber distribution. The elastic behavior of the fiber network compression depends on the fiber oreientation. These two are integrated to predict the processing parameters.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750150106
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  • 8
    Electronic Resource
    Electronic Resource
    Microstructure-based processing parameters of thermoplastic composite materials. Part II: Experimental results (1994)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 15 (1994), S. 42-45 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The permeability of termoplastic composites and the elastic behavior of their fiber networks were measured during compression molding. As these processing parameters depend on the microstructure of the composite, experiments were performed to determine them for tape prepreg, commingled two repreg, and powder-coated tow prepreg. The experimental results agree closely when compared to the theoretical predictions.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750150107
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  • 9
    Electronic Resource
    Electronic Resource
    Thermoforming of high performance thermoplastic composites (1990)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 11 (1990), S. 280-285 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Matched-die forming of a 90° bend in a quasi-isotropic 16 ply laminate of ICI's APC-2, containing 61 volume % Hercules AS-4 continuous carbon fiber in poly(etheretherketone) (PEEK), is described. To uncouple and characterize elementary deformation phenomena, a series of simple tests are developed. Single ply bending of APC-2 tape up to 420°C has been performed to characterize elastic bending. Transverse flow, axial interply shear flow, and z direction elasticity have been characterized in an instrumented matched die mold. Interply shear flow is characterized using a simple shear test fixture. Transverse flow and interply slip are relatively easily induced. Precautions should be taken to avoid fiber buckling and to provide for laminate reconsolidation.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750110505
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  • 10
    Electronic Resource
    Electronic Resource
    Quantitative image processing analysis of composite materials (1994)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 15 (1994), S. 46-54 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Quantitative digital image processing has been used to analyze unidirectional thermoplastic composites. The fiber volume fraction is determined by the template matching method and compared with the conventional thresholding method. A combination of skeleton and edge cutting is used to obtain the centers of the fibred in the image. The Voronoi distances are calculated from the result. The Hough transform is applied to the fiber orientation in conjunction with thresholding by the line length in the image. To describe the fiber orientation, characteristic function are defined in the width and thickness directions, which allow a much more accurate and effective description of the fiber distribution and orientation than other methods. Advantages of the template method are that similar results to the threshold method can be obtained as thresholding with a lower magnifications, resulting in an improved statistical sample with a reduced number of photomicro-graphs.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750150108
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