Kongress für den Kirchenbau des Protestantismus // Kongress für den Kirchenbau des Protestantismus ; 1 PDF Download

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 60

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Author: J.J. Beaman
Publisher: Springer Science & Business Media
ISBN: 1461563275
Category : Technology & Engineering
Languages : en
Pages : 332

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Book Description
Solid Freeform Fabrication is a set of manufacturing processes that are capable of producing complex freeform solid objects directly from a computer model of an object without part-specific tooling or knowledge. In essence, these methods are miniature manufacturing plants which come complete with material handling, information processing and materials processing. As such, these methods require technical knowledge from many disciplines; therefore, researchers, engineers, and students in Mechanical, Chemical, Electrical, and Manufacturing Engineering and Materials and Computer Science will all find some interest in this subject. Particular subareas of concern include manufacturing methods, polymer chemistry, computational geometry, control, heat transfer, metallurgy, ceramics, optics, and fluid mechanics. History of technology specialists may also find Chapter 1 of interest. Although this book covers the spectrum of different processes, the emphasis is clearly on the area in which the authors have the most experience, thermal laser processing. In particular, the authors have all been developers and inventors of techniques for the Selective Laser Sintering process and laser gas phase techniques (Selective Area Laser Deposition). This is a research book on the subject of Solid Freeform Fabrication.

Author: Guisheng Zong
Publisher:
ISBN:
Category : Sintering
Languages : en
Pages : 304

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Author:
Publisher:
ISBN:
Category : Ceramic materials
Languages : en
Pages : 238

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Book Description

Author: Stephen C. Danforth
Publisher: Mrs Proceedings
ISBN:
Category : Computers
Languages : en
Pages : 240

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Book Description
The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.

Author:
Publisher:
ISBN:
Category : Solid freeform fabrication
Languages : en
Pages : 458

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Author:
Publisher:
ISBN:
Category : Solid freeform fabrication
Languages : en
Pages : 448

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Book Description

Author: Duane Dimos
Publisher: Mrs Proceedings
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 200

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Book Description
The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.

Author: Kathryn V. Logan
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 400

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Book Description
The 38 contributions are organized by session as they occurred in the program. Topics include combustion synthesis, advanced processing of composites, novel synthesis, nanotechnology and advanced characterization, and sol-gel technology. Includes ample diagrams, b&w illustrations. Annotation copyrig

Author: Masoud Alimardani
Publisher:
ISBN:
Category :
Languages : en
Pages : 144

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Book Description
The quality of parts fabricated using Laser Solid Freeform Fabrication (LSFF) is highly dependent on the physical phenomena and operating parameters which govern the process. For instance, the thermal stress patterns and intensity, induced throughout the process domain due to the layer-by-layer material deposition and the temperature distribution characteristics, contribute significantly to potential delamination and crack formation across the fabricated part. In this research, some of the main features as well as drawbacks of this technique are studied through a multi-physics analysis of the process. For this purpose, a coupled time-dependent 3D model is developed with which the geometry of the deposited material as well as temperature and thermal stress fields across the process domain can be predicted. In the proposed approach, coupled thermal and stress domains are numerically obtained assuming a decoupled interaction between the laser beam and powder stream. To predict the geometry of the deposited material, once the melt pool boundary is obtained, the process domain is discretized in a cross-sectional fashion based on the powder feed rate, elapsed time, and intersection of the melt pool and powder stream projected on the substrate. Layers of additive material are then added onto the non-planar domain. The main process parameters affected by a multilayer deposition due to the formation of non-planar surfaces, such as powder catchment, are incorporated into the modelling approach to enhance the accuracy of the results. To demonstrate the proposed algorithm and to study the main features of the process, a four-layer thin wall of AISI 304L steel on a substrate of the same material is numerically and experimentally fabricated. The numerical analyses along with the experimental results are then used to investigate the correlation between the temperature-thermal stress fields and crack formation across the fabricated parts. The trend of the results reveals that by preheating the substrate prior to the fabrication process, it is possible to substantially reduce the formed micro-cracks. To demonstrate the feasibility of preheating on the reduction of micro-cracks, several simulations and experiments are performed in which a crack-free result is obtained, with a 22 per cent reduction in thermal stresses when the substrate is preheated to 800 K. The numerical and experimental results are also used to study the circumstances of the microstructural formation during the fabrication process. To conclude this research, the developed modelling approach is further extended to briefly discuss the effects of the path patterns and the main operating parameters on the outcomes of the process. The effects of the material properties and their variations on the temperature distributions and thermal stress fields are studied by fabrication of a thin wall of two Stellite 6 layers and two Ti layers on a stainless steel substrate.