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  • Open Access

    ABSTRACT

    Elastoplastic Phase Field Model for Time-dependent Hydrogen Diffusion, Hydride (and Blister) Formation and Fracture Initiation in Zirconium

    San-Qiang Shi

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.2, pp. 35-36, 2011, DOI:10.3970/icces.2011.020.035

    Abstract Zirconium and its alloys are key structural materials used in the nuclear power industry. In service, these metals are susceptible to a slow corrosion process that leads to a gradual pickup of hydrogen impurities from the environment. It is well known that hydrogen impurity will be attracted to stress concentrators such as notch and crack tips. At a certain hydrogen level, a complicated pattern of hydride precipitates can develop around these stress concentrators. Because of the brittleness of these hydrides, the original strength of the alloys can be reduced by orders of magnitude, and the fracture through these hydrides may… More >

  • Open Access

    ABSTRACT

    Warpage Measurement of Diamond Coated Grinding Wheel by Shadow MoirAC

    Terry Yuan-Fang Chen, Jian-Siang Chen

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.2, pp. 33-34, 2011, DOI:10.3970/icces.2011.020.033

    Abstract Chemical mechanical planarization (CMP) process flattens the wafer by polishing it against a rotating pad. During the polishing process, a diamond coated grinding wheel must be frequently employed to remove the accumulated debris lest the polishing surface glazes. To assure the flatness of polished wafers during the CMP process, the surface warpage of the diamond grid dresser surface must be small enough. In this study, phase-shifted shadow moirAC method was employed to measure the surface profile of diamond grinding wheel, and the warpage was determined by LSM (lease-squares surface method). Since the impinging light may either be reflect directly or… More >

  • Open Access

    ABSTRACT

    First Principles Study of Nano-bio Hybrid Systems

    Ravi Pandey

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 31-32, 2011, DOI:10.3970/icces.2011.020.031

    Abstract Theme Lecture: First Principles Study of Nano-bio Hybrid Systems
    Prof Ravi Pandey
    Michigan Tech University, USA More >

  • Open Access

    ABSTRACT

    Dynamic Strain Sensing Using Adaptive Fiber Bragg Grating Sensors

    Yan-Jin Zhu, Yinian Zhu, Li Hui, Sridhar Krishnaswamy

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 29-30, 2011, DOI:10.3970/icces.2011.020.029

    Abstract Invited Lecture

    Prof. Sridhar Krishnaswamy

    Northwestern University, USA More >

  • Open Access

    ABSTRACT

    Award Lecture

    Jeom Kee Paik

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 27-28, 2011, DOI:10.3970/icces.2011.020.027

    Abstract T.H.H. PIAN MEDAL

    Award Lecture

    Prof. Jeom Kee Paik

    Department of Naval Architecture and Ocean Engineering

    Pusan National University, Korea More >

  • Open Access

    ABSTRACT

    Molecular dynamics simulations of the nano-indentation for aluminum and copper

    Xiaozhi Tang, Yafang Guo, Yu Gao

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 25-26, 2011, DOI:10.3970/icces.2011.020.025

    Abstract Atomistic simulations were performed to study the nano-indentation for two kinds of FCC metals, aluminum and copper. Two different deformation mechanisms were observed in our simulation under exactly the same simulation condition. An embedded atom method potential was employed for copper and a generalized form of EAM potential due to Finnis and Sinclair for aluminum. In the simulation model, the substrate was constructed with 78408 atoms in an 8I?*40I?*60I? cell, here I? means the lattice constant. The indenter was modeled by a cubic with its side length of 8a.During the simulation, the period boundary condition was applied to the (1… More >

  • Open Access

    ABSTRACT

    Computational Characterisation of FRC Using Micromechanical FEA Based on Appropriate Unit Cells

    Shuguang Li

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 23-24, 2011, DOI:10.3970/icces.2011.020.023

    Abstract Unit cells have been found as an empowering tool for the characterisations of modern composites. The author is honoured to have contributed to the establishment of a systematic methodology for the formulation of unit cells in the past decade through over a dozen of publications on this specific topic.
    The formulation of a unit cell could start as if it was a trivial exercise, at least as sometimes perceived by some users, where casual treatments have been found as a result. However, it could soon become overwhelming in order to stand scrutiny and to deal with more sophisticated scenarios. Many… More >

  • Open Access

    ABSTRACT

    Active thermography based integrated system for Nondestructive testing and evaluation and its applications

    Y.S. Chen, Y.H. Huang, B. Yeung, L. Liu, Y.Y. Hung

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 21-22, 2011, DOI:10.3970/icces.2011.020.021

    Abstract Active thermography is an optical-based non-contact inspection method for full-field and quantitative measurement of surface radiation to predict potential faults or inner structure of a test object. The mechanism of the active thermography inspection is to excite the test object using appropriate thermal excitation methods and measure the corresponding thermal response. Active thermography conducts testing in a more controllable way and offer more reliable results compared to passive thermography. This paper reports the development of integrated systems featured some advanced excitation methods and thermal image processing methods. Experiments have been conducted on samples with disbonds, delaminations, internal cracks or voids,… More >

  • Open Access

    ABSTRACT

    An Overview of Aviation Safety Research an Center for Aviation Safety at North Carolina A&T State University

    Kunigal Shivakumar

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 19-20, 2011, DOI:10.3970/icces.2011.020.019

    Abstract The vision of the Center for Aviation Safety (CAS) is to establish a strong aerospace engineering research and education program by bringing together highly competent and dedicated faculty members at North Carolina A&T State University (A&T) through the NASA funding to address the challenges in composite aircraft structures, fire safety, hazards of airflow, and the alternate fuels. The research goals of CAS will be accomplished through an understanding of science and engineering to developing new materials, tools, models, and technologies that support the safe operation of aerospace vehicles. Research goal is being accomplished through three tasks: Advancing Composites and Structures;… More >

  • Open Access

    ABSTRACT

    Robust Formation Design for the Magnetospheric Multiscale Mission using a Stochastic Optimization Approach

    C. W. T. Roscoe, S. R. Vadali, K. T. Alfriend

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 17-18, 2011, DOI:10.3970/icces.2011.020.017

    Abstract A stochastic optimization approach is used to design a tetrahedral spacecraft formation for the NASA Magnetospheric Multiscale (MMS) mission whose performance characteristics are robust with respect to differential semimajor axis errors. The MMS mission requires a formation of four satellites which is to form a nearly regular tetrahedron near apogee of a highly eccentric orbit, and is to remain in this configuration throughout as many successive orbits as possible without maintenance maneuvers. When all design parameters are deterministic, such a formation can be designed by maximizing a "quality factor" throughout a "region of interest," either over multiple orbits or over… More >

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