• ICALEO 2009 Paper #1903 (Effect of Substrate on Temperature Field in Selective Laser Sintering of Metal Powders)

    Effect of Substrate on Temperature Field in Selective Laser Sintering of Metal Powders
    Authors:
    Xianfeng Shen, Institute of Machinery Manufacturing Technology; Mianyang Peoples Republic of China
    Yang Wang, -; -
    Jialin Yang, -; -
    Presented at ICALEO 2009

    Selective laser sintering (SLS) of metal powders is an attractive Rapid Prototyping and Manufacturing (RPM) technology which can be used to produce three-dimensional metal parts directly from a CAD model. In the process, the substrates are commonly used for avoiding the balling effect in powder melting and dislocation of sintered part. A three-dimensional finite element thermal model in SLS of metal powder including t...

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  • ICALEO 2009 Paper #1904 (Effect of Path Planning on Residual Stress Distribution in Laser Powder Deposition Process)

    Effect of Path Planning on Residual Stress Distribution in Laser Powder Deposition Process
    Authors:
    Ehsan Foroozmehr, Southern Methodist University; Dallas TX USA
    Radovan Kovacevic, Rcam-Smu; Dallas TX USA
    Presented at ICALEO 2009

    One of the important parameters in laser powder deposition process is the deposition path pattern that affects final quality of the deposited material. In this study, a finite element method is used to model the thermal and structural behavior of the laser powder deposition process. An area is defined to be covered with AISI H13 powder with three different deposition patterns: one-section, two-section, and three-section. The two-section pattern divides th...

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  • ICALEO 2009 Paper #1907 (Application of Holographic Beam Shaping in Selective Laser Melting for the Fabrication of Functional Polymer Components)

    Application of Holographic Beam Shaping in Selective Laser Melting for the Fabrication of Functional Polymer Components
    Authors:
    Darrel Bunyan, Loughborough University; Loughborough Great Britain
    Richard Heath, Loughborough University; Loughborough Great Britain
    John Tyrer, Loughborough University; Loughbrough Great Britain
    Matthew Gibson, Loughborough University; Loughborough Great Britain
    Presented at ICALEO 2009

    The applications of selectively laser sintered polymer components have been greatly limited by their poor mechanical properties as a result of high levels of residual porosity. This paper looks at the effects of using holographic beam shaping to...

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  • ICALEO 2009 Paper #1908 (Comparison of Powder Additive Qualities with Regard to Achievable LMD Results)

    Comparison of Powder Additive Qualities with Regard to Achievable LMD Results
    Authors:
    Marco Goebel, Llt, Chair for Laser Technology Rwth Aachen; Aachen Germany
    Steffanie Linnenbrink, Llt, Chair for Laser Technology Rwth Aachen; Aachen Germany
    Ingomar Kelbassa, Llt, Chair for Laser Technology Rwth Aachen; Aachen Germany
    N. Ludwig, -; -
    Presented at ICALEO 2009

    Laser Metal Deposition (LMD) is a common technology used for local repairs and additive manufacturing of complete parts 3D applications such as aero engine and automotive components as well as for wear and corrosion protection of parts 2D cladding applications such as tools, dies, a...

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  • ICALEO 2009 Paper #1910 (FOCAL SHIFT MONITORING AND COGNITIVE CLOSED-LOOP CONTROL BY ANALYSIS OF CO-AXIAL VIDEO DATA)

    FOCAL SHIFT MONITORING AND COGNITIVE CLOSED-LOOP CONTROL BY ANALYSIS OF CO-AXIAL VIDEO DATA
    Authors:
    Thibault Bautze, LDV, Technical Univ. of Munich; Munich Germany
    Tobias Kaiser, FSR, Technical Univ. of Darmstadt; - Germany
    Sonja Huber, IWB, Technical Univ. of Munich; Munich Germany
    Presented at ICALEO 2009

    Most laser welding heads offer the ability to connect a co-axial camera, using the same focusing lenses as the laser beam. Thus, the focal shift induced by heating the lenses and thus influencing the laser beam, alters the video data acquired. In the proposed approach, the sharpness of the video data is used to monitor the focal shift and distance changes relative ...

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  • ICALEO 2009 Paper #201 (Investigation into Time Dependant Degradation and Atmospheric Conditions on the Wettability of Nylon 6,6 which Has Undergone CO2 Laser Surface Modification)

    Investigation into Time Dependant Degradation and Atmospheric Conditions on the Wettability of Nylon 6,6 which Has Undergone CO2 Laser Surface Modification
    Authors:
    David Waugh, Loughborough University; Loughborough Great Britain
    Jonathan Lawrence, Loughborough University; Loughborough Great Britain
    D.J. Morgan, -; -
    Presented at ICALEO 2009

    Although CO2 lasers have been shown to be capable of modifying the wettability of polymeric materials, it is known that the CO2 laser induced wettability modifications of these materials can degrade over time. This can be seen to be crucial from a commercial point of view as this would indicate that a shelf-life has to be establis...

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  • ICALEO 2009 Paper #202 (Laser Surface Treatment of Engineering Ceramics and the Effects Thereof on Fracture Toughness)

    Laser Surface Treatment of Engineering Ceramics and the Effects Thereof on Fracture Toughness
    Authors:
    Pratik Shukla, Loughborogh University; Leicestershire Great Britain
    J. Lawrence, -; -
    Presented at ICALEO 2009

    Surface treatment of Si3N4 and ZrO2 engineering ceramics with a CO2 laser and a fibre laser was conducted to identify changes in the fracture toughness (K1c). Vickers macro hardness indentation tests were employed prior to and after the laser treatment to investigate the near surface changes in the hardness of the engineering ceramics. Optical microscopy was then used to observe the near surface integrity, crack lengths and crack geometry within the engineering ceramics....

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  • ICALEO 2009 Paper #204 (Characterization and Compositional Study of Fibre Laser Processed Engineering Ceramics)

    Characterization and Compositional Study of Fibre Laser Processed Engineering Ceramics
    Authors:
    Pratik Shukla, Loughborogh University; Leicestershire Great Britain
    Jonathan Lawrence, Loughborough University; Leicestershire Great Britain
    Presented at ICALEO 2009

    Surface treatment by means of a CO2 laser and a fibre laser radiation was conducted on cold isostatic pressed (CIP) silicon nitride (Si3N4) and zirconia (ZrO2) engineering ceramics to observe changes in their characteristics, surface integrity, microstructure and composition. Scanning electron microscopy (SEM) was used to observe the integrity prior to and after laser processing. Energy dispersive X-ray (EDX) analysis was em...

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  • ICALEO 2009 Paper #205 (Laser-Generated Crack-Like Features for Fatigue Testing)

    Laser-Generated Crack-Like Features for Fatigue Testing
    Authors:
    Elizabeth Gounaris, Connecticut Center for Advanced Technology; East Hartford CT USA
    D. Cassioppo, -; -
    Paul Denney, Connecticut Center for Advanced Technology; East Hartford CT USA
    Presented at ICALEO 2009

    For several industries including aerospace, maritime, automotive and medical it is essential to develop a cost-effective, highly-reliable method to certify damage tolerances for fatigue-critical components. To certify materials for damage tolerances, they must have precise and repeatable artificial crack initiation sites in order to accurately measure fatigue deficits. At present, accepted methods of...

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  • ICALEO 2009 Paper #206 (Texturing Structures of Ti Films by Multiple Femtosecond Laser Pulses)

    Texturing Structures of Ti Films by Multiple Femtosecond Laser Pulses
    Authors:
    Yongguang Huang, College of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
    Shibing Liu, College of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
    Presented at ICALEO 2009

    Femtosecond laser texturing has proved to be a particularly powerful method for creating a wide variety of surface structures on the metal films, such as a hollow microbump-nanojet sturcture and disk-column-nanodroplet structure on the gold films. The process of femtosecond laser texturing does not rely on material removal, but on hydrodynamic flow produced ...

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