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第十三届国际复合材料会议

作者： H.P.Zhao RobertK.Y.Li Z.P.Duan J.KKim Y.W.Mai Division of Fundamental Mechanics Institute of Mechanics Chinese Academy of Sciences 100080 Beijing People's Republic of China Department of Applied Physics and Materials Science City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong Department of Applied Physics and Materials Science City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong Division of Fundamental Mechanics Institute of Mechanics Chinese Academy of Sciences 100080 Beiiing People's Republic of China Department of Mechanical Engineering Hong Kong University of Science and technology Clear Water Bay Kowloon Hong Kong Department of Manufacturing Engineering and Engineering Management City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong

The mode Ⅱ Interlaminar fracture toughness of stitched CFRP composites under impact loading was investigated in this paper. CFRP composites laminates were lay up with 24 plies of prepreg, and were stitched with Kevlar yarns using three different stitching patterns (see Fig. 1). Other than the three different stitching patterns, two different stitching densities were also employed. The end-notch flexure (ENF) sample geometry was used. An experimental method using the modified Split Hopkinson Pressure Bar (SHPB) technique has been developed (Fig. 2) so as to evaluate the mode Ⅱ interlaminar fracture toughness under impact rate of loading. Typical signals obtained from the SHPB measurements are shown in Fig. 3. Obviously, the experimental results showed that stitching technique could be designed to improve fracture resistance and impact resistance of CFRP in comparison to the non-stitched CFRP composite.

关键词： fracture toughness, stitching, SHPB, mode II, CFRP

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Flexure Response of Stitched CFRP Laminates

Flexure Response of Stitched CFRP Laminates

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第十三届国际复合材料会议

作者： H.P.Zhao RobertK.Y.Li Z.P.Duan J.KKim Y.W.Mai LNM Institute of Mechanics Chinese Academy of Sciences 100080 Beijing People's Republic of China Department of Applied Physics and Materials Science City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China Department of Applied Physics and Materials Science City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China LNM Institute of Mechanics Chinese Academy of Sciences 100080 Beijing People's Republic of China Department of Mechanical Engineering Hong Kong University of Science and technology Clear Water Bay Kowloon Hong Kong China Department of Manufacturing Engineering and Engineering Management City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China

The flexure response of stitched CFRP composites under static and impact loading was investigated in this paper. CFRP composites laminates were lay up with 24 plies of prepreg, and were stitched with Kevlar29 yarns using three different stitching patterns (see Fig.1). Other than the three different stitching patterns, two different stitching densities were also employed. The end-notch flexure (ENF) sample geometry was used. Typical loading-displacement curves obtained from the measurements were shown in Fig. 2.

关键词： flexural response, stitching, CFRP, failure processes, SEM

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New Technique for Determining Mechanical Property of Polymer/Metal Interface

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MRS Online Proceedings Library 2001年第1期661卷 KK5.1.1-KK5.1.6页

作者： Du, T. Liu, M. Seghi, S. Hsia, K. J. Economy, J. Shang, J. K. Department of Materials Science and Engineering University of Illinois at Urbana-Champaign Urbana USA Department of Theoretical and Applied Mechanics University of Illinois at Urbana-Champaign Urbana USA

A new experimental technique for determining mechanical properties of the polymer-metal interface was developed by replacing conventional mechanical testing machine with a piezoelectric actuator. Using this technique, fatigue crack growth behavior of epoxy/aluminum interface was studied as a function of electric field, crack length and cyclic frequency. The crack growth rate was found to depend on the magnitude of the applied electric field and decrease with testing frequency.

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FRACTURE MECHANISM AND MICROMECHANICAL ANALYSIS OF POLYSYNTHETICALLY TWINNED CRYSTALS OF γTiAl ALLOYS

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中国有色金属学会会刊:英文版 1999年第S1期9卷 130-137页

作者： Y.G.Zhang Y.H.Lu G.K.Hu C.Q.Chen Department of Materials Science and Engineering Beijing University of Aeronautics and Astronautics UnversityBeijing 100083China Department of Applied Mechanics Beijing Institute of TechnologyBeijing 100081China

The fracture behavior and mechanism of PST crystals of a Ti 49%(mole fraction)Al alloy have been studied by using in situ straining and micromechanical calculation. The three dimensional micromechanical model representing the structure of PST crystal has been built, and the stress distribution ahead of the sharp and blunt crack tips either parallel to lamellar interface or perpendicular to the lamellae has been calculated by using finite element method based on linear elasticity of PST crystals. The experimental results show that the fracture behaviors and mechanisms are strongly dependent on the angle of loading axis to the lamellae. The calculation indicates that nucleation and propagation of microcrack along the interfaces are controlled by the normal stress and translamellar microcrack is controlled by shear stress ahead of crack tip.

关键词： TiAl alloy PST crystal fracture behavior mechanism micromechanical model finite element method

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Ceramic SFF by direct and indirect stereolithography

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materials Research Society Symposium - Proceedings 1999年 542卷 119-123页

作者： Chu, Gabriel T.-M. Brady, G. Alien Miao, Weiguo Halloran, John W. Hollister, Scott J. Brei, Diann Department of Materials Science and Engineering Ann Arbor MI United States Departments of Biomédical Engineering Ann Arbor MI United States Department of Mechanical Engineering and Applied Mechanics University of Michigan Ann Arbor MI United States

Direct ceramic stereolithography (SLA) is done using UV-curable suspensions of powders in acrylates in a conventional SLA machine. Hydroxyapatite prototypes for bone tissue scaffolds are built from Image-Based Design files, featuring an interior architecture of void passages. Complex alumina objects are built as digital sculptures. Piezoelectric ceramic actuators from PZT, which are difficult to photocure, are built using indirect stereolithography, where SLA-built epoxy molds are used to form a thermal-cured suspension of PZT powders. We report on the thermal-curing behavior of the suspensions, and the fundamentals of part building.

关键词： Layered manufacturing

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Blackwater and Graywater on US navy ships: Technical challenges and solutions

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NAVAL ENGINEERS JOURNAL 1999年第3期111卷 293-306页

作者： Benson, J Caplan, I Jacobs, R John Benson:received his BS degree in Mechanical Engineering and MS degree in Environmental Engineering from the University of Maryland. He is a registered Professional Engineer in the State of Maryland. He Joined the Naval Sufrace Warfare Center Carderock Division Environmental Quality Department in 1990 as a project engineer and is now managing the non-oily wastewater (graywater and blackwater) project area. Mr. Ivan Caplan:graduated from Drexel University (Philadelphia Pennsylvania) with a BS in Metallurgical Engineering and was awarded a MS degree from the Johns Hopkins University (Baltimore Maryland) in Mechanics and Materials Science. Mr. Caplan has spent most of his career at the Carderock Division Naval Surface Warfare Center (NSWC) and is currently the Head of the Wastewater Management Branch in the Carderock Division's Environmental Quality Department. Previously Mr. Caplan managed the US Navy's Applied Research Program in Ship & Submarine Materials Technology. In addition Mr. Caplan was manager of the US Navy's Titanium Technology Program Office and during his government career held several external Program Manager positions on at the Naval Sea Systems Command and another at the Air Force Office of Scientific Research. Rachel Jacobs:received BS degrees in Chemical Engineering and Marine Biology from the University of Maryland College Park. After working for the Naval Research Laboratory in Washington DC and the Center for Marine Biotechnology in Baltimore MD she joined the staff of the Naval Surface Warfare Center's Environmental Quality Department in 1997. Since thta time Ms. Jacobs has worked in the non-oily wastewater treatment area and her principal responsibility has been to technically supervise the evaluation operation and modification graywater treatment.

In anticipation of more stringent environmental regulations, the increasing costs of waste disposal, and the need for naval combatants to operate unimpeded in littoral waters, the U.S. Navy has identified the need to develop technologies which are appropriate for the control and treatment of blackwater and graywater. This paper will describe the status of development efforts by the Carderock Division, Naval Surface Warfare Center (CDNSWC) and its supporting contractors, under sponsorship of Naval Sea Systems Command (NAVSEA) and the Office of Naval Research. The challenge was to develop treatment systems that meet Navy shipboard requirements for affordability, compactness, low manning/maintenance, high reliability and safety, and EM, noise, vibration and shock. Membrane ultrafiltration based systems, incorporating aerobic biological pre-treatment and ultraviolet light post treatment disinfection, have ken developed to meet these requirements. Both external and in-tank membrane systems will be described in terms of performance, system operation and space and weight advantages.

关键词： Naval vessels

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Local and Effective Elastic Properties of Grain Boundaries in Silicon

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physica status solidi (a) 1999年第1期166卷

作者： A. G. Marinopoulos V. Vitek J. L. Bassani Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA 19104 USA Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania Philadelphia PA 19104 USA

When considering the mechanical behaviour of materials an important property is the tensor of elastic moduli. Recently, local elastic moduli of interfaces have been defined and studied for metallic materials [1 to 3]. In these works grain boundaries are regarded as heterogeneous continua composed of ‘phases’ associated with individual atoms which possess elastic moduli identified with the atomic-level moduli evaluated at corresponding atomic positions. From this representation it is possible to define the ‘effective’ moduli of the grain boundary region. In this paper this concept is developed for materials with covalent character of bonding, specifically silicon. Using the Tersoff's potential [4, 5], the atomic-level and effective elastic moduli of the interfacial region have been evaluated for three alternate structures of the Σ = 3 (112-)/[11-0] tilt boundary. These calculations are then compared with the continuum bounds on the effective moduli evaluated using the classical minimum-energy principles of elasticity. The effective moduli calculated in the atomistic framework are generally within the continuum bounds and thus the present study demonstrates that the heterogeneous continuum model of the interfaces is appropriate for the description of the elastic properties of grain boundaries in silicon. An important aspect addressed in this study is the uniqueness of interfacial elastic moduli since their evaluation involves the energy associated with an atom which cannot be defined uniquely. The calculations have been made for two different partitions of the total energy into energies associated with individual atoms. These two partitions lead to almost identical results for the effective moduli and continuum bounds when the tensor of the atomic-level moduli is positive definite. When some atomic-level moduli are not positive definite the results may depend on the chosen energy partition.

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Royal Academy of Medicine in Ireland Section of Bioengineering

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Irish Journal of Medical science 1999年第3期168卷 208-220页

作者： Lee, T. C. Shine, J. D. FitzPatrick, D. P. Bradley, J. A. O’Connor, J. J. O’Kelly, K. U. Carr, A. J. McCormack, B. A. O. O’Neill, P. Cole, J. S. Watterson, J. K. Raghunathan, S. O’Reilly, M. J. G. Pherwani, A. Rice, J. McCormack, D. Maher, S. A. Prendergast, P. J. Reid, A. J. Waide, D. V. Chambers, S. D. Bartlett, R. H. Ceccio, S. L. Murphy, L. A. Lacroix, D. Murphy, B. P. Mullett, H. Shannon, F. Lawlor, G. O’Rourke, S. K. Connolly, P. Maher, S. Devitt, A. McElwain, J. O’Reilly, P. McCarthy, D. R. Kernohan, G. Buchanan, F. J. Sim, B. Downes, S. Bennett, D. B. Orr, J. F. Dorrell, P. F. Fleming, P. Stephens, M. Moholkar, K. Fenelon, G. Doyle, A. M. Dockrell, S. Normoyle, P. Geraghty, D. MacNamara, S. Lacey, G. Lally, C. McGloughlin, T. Grace, P. Walsh, M. McGIoughlin, T. Colgan, D. Daly, S. Dolan, B. Flynn, M. J. Shuhaibar, M. Neligan, M. C. McMillan, N. D. O’Mongain, E. Walsh, J. Miller, R. Mitchell, I. O’Neill, M. Brennan, F. Ridgway, P. Blayney, A. W. Monkhouse, W. S. O’Brien, F. J. Taylor, D. Mushipe, M. T. Shelton, J. C. Revell, P. A. McCarthy, M. A. Pearse, K. M. O’Keefe, D. T. Lyons, G. M. Leane, G. E. Mulcahy, E. Bray, K. Conway, B. A. Halliday, D. M. Rosenberg, J. R. Anderson, R. Grace, P. A. Kinsella, S. M. Harrison, A. J. Lyons, D. J. Wallace, K. E. Hill, R. G. Pembroke, J. T. Brown, C. J. Hatton, P. V. Bryan, K. Buggy, M. Noe, J. M. Nico, A. C. McConnell, L. A. McGivern, R. C. Marsh, D. R. Meenan, B. J. Workman, A. Kuiper, J. H. Department of Anatomy Royal College of Surgeons in Ireland Dublin 2 Department of Mechanical and Manufacturing Engineering Trinity College Dublin 2 Division of Neuroscience and Biomedical Systems Glasgow University Glasgow Stryker Howmedica Osteonics Limerick Bioengineering Research Centre Department of Mechanical Engineering University College Dublin Department of Engineering Science University of Oxford England Bioengineering Research Centre Department of Mechanical Engineering University College Dublin Belfield Dublin 4 Department of Mechanical & Electronic Engineering Sligo Institute of Technology Co Sligo School of Aeronautical Engineering The Queen’s University of Belfast Belfast Vascular Surgery Unit Belfast City Hospital Belfast Department of Orthopaedic Surgery The Children’s Hospital Dublin 1 The Children’s Hospital Dublin 1 Department of Mechanical Engineering Trinity College Dublin 2 Tallaght Hospital Dublin 24 Bioengineering Group Dept. of Mechanical Engineering Trinity College Dublin 2 Department of Mechanical Engineering National University of Ireland Galway Department of Surgery University of Michigan Ann Arbor USA Department of Mechanical Engineering and Applied Mechanics University of Michigan Ann Arbor USA Department of Mechanical Engineering University of Dublin Ireland Department of Orthopaedic Surgery St. Vincent’s Hospital Dublin Department of Bioengineering University College Dublin Belfield Dublin Our Lady’s Hospital for Sick Children Crumlin Waterford General Hospital Co. Waterford Health Sciences University of Ulster Newtownabbey Co Antrim N. Ireland School of Mechanical and Manufacturing Engineering The Queen’s University of Belfast Belfast School of Biomedical Science The University of Nottingham Nottingham Department of Orthopaedic Surgery St. James’s Hospital Dublin 8 School of Physiotherapy University of Dublin Ireland Department of Computer Science Trinity College Dublin Ireland University of Limerick Limerick Ireland

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Contributory presentations/posters

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Journal of Biosciences 1999年第1期24卷 33-198页

作者： N. Manoj V. R. Srinivas A. Surolia M. Vijayan K. Suguna R. Ravishankar R. Schwarzenbacher K. Zeth Diederichs G. M. Kostner A. Gries P. Laggner R. Prassl Madhusudan Pearl Akamine Nguyen-huu Xuong Susan S. Taylor M. Bidva Sagar K. Saikrishnan S. Roy K. Purnapatre P. Handa U. Varshney B. K. Biswal N. Sukumar J. K. Mohana Rao A. Johnson Vasantha Pattabhi S. Sri Krishna Mira Sastri H. S. Savithri M. R. N. Murthy Bindu Pillai Kannan M. V. Hosur Mukesh Kumar Swati Patwardhan K. K. Kannan B. Padmanabhaa S. Sasaki-Sugio M. Nukaga T. Matsuzaki S. Karthikevan S. Sharma A. K. Sharma M. Paramasivam P. Kumar J. A. Khan S. Yadav A. Srinivasan T. P. Singh S. Gourinath Neelima Alam A. Srintvasan Vikas Chandra Punit Kaur Ch. Betzel S. Ghosh A. K. Bera S. Bhattacharya S. Chakraborty A. K. Pal B. P. Mukhopadhyay I. Dey U. Haldar Asok Baneriee Jozef Sevcik Adriana Solovicova K. Sekar M. Sundaralingam N. Genov Dong-cai Liang Tao Jiang Ji-ping Zhang Wen-rui Chang Wolfgang Jahnke Marcel Blommers S. C. Panchal R. V. Hosur Bindu Pillay Puniti Mathur S. Srivatsun Ratan Mani Joshi N. R. Jaganathan V. S. Chauhan H. S. Atreya S. C. Sahu K. V. R. Chary Girjesh Govil Elisabeth Adjadj Éric Quinjou Nadia Izadi-Pruneyre Yves Blouquit Joël Mispelter Bernadette Heyd Guilhem Lerat Philippe Milnard Michel Desmadreil Y. Lin B. D. Nageswara Rao Vidva Raghunathan Mei H. Chau Prashant Pesais Sudha Srivastava Evans Coutinho Anil Saran Leizl F. Sapico Jayson Gesme Herbert Lijima Raymond Paxton Thamarapu Srikrishnan C. R. Grace G. Nagenagowda A. M. Lynn Sudha M. Cowsik Sarata C. Sahu S. Chauhan A. Bhattacharya G. Govil Anil Kumar Maurizio Pellecchia Erik R. P. Zuiderweg Keiichi Kawano Tomoyasu Aizawa Naoki Fujitani Yoichi Hayakawa Atsushi Ohnishi Tadayasu Ohkubo Yasuhiro Kumaki Kunio Hikichi Katsutoshi Nitta V. Rani Parvathy R. M. Kini Takumi Koshiba Yoshihiro Kobashigawa Min Yao Makoto Demura Astushi Nakagawa Isao Tanaka Kunihiro Kuwajima Jens Linge Seán O. Donoghue Michael Nilges G. Chakshusmathi Girish S. Ratnaparkhi P. K. Madhu R. Varadarajan C. Tetreau Molecular Biophysics Unit Indian Institute of Science Bangalore India Austrian Academy of Sciences Institute of Biophysics and X-ray Structure Research Graz Austria Faculty of Biology University of Konstanz Germany Institute of Medical Biochemistry University of Graz Austria Howard Huges Medical Institute Department of Chemistry & Biochemistry University of California La Jolla USA Department of Chemistry & Biochemistry University of California San Diego La Jolla USA Molecular Biophysics Unit India Department of Microbiology &Cell Biology Indian Institute of Science Bangalore India Macromolecular Structure Laboratory NCI - Frederick Cancer Research and Development Center ABL - Basic Research Program Frederick USA Department of Crystallography and Biophysics University of Madras Chennai Biochemistry Department Indian Institute of Science Bangalore India Condensed Matter Physics Division B.A.R.C. Trombay Mumbai Condensed Matter Physics Division Bhabha Atomic Research Centre Trombay Mumbai IMCB The University of Tokyo Tokyo Japan Mitsubishi Chemical Corporation Yokohama Research Center Yokohama Japan Faculty of Pharmaceutical Sciences Chiba University Chiba Japan Department of Biophysics All India Institute of Medical Sciences New Delhi India Department of Biophysics All India Institute of Medical sciences New Delhi India Institüt Physiologische Chemie Hamburg Germany Biophysics Department Bose Institute Calcutta India Slovak Academy of Sciences Institute of Molecular Biology Bratislava Slovakia Indian Institute of Science Bioinformatics Centre Bangalore Departments of Chemistry and Biochemistry Biological Macromolecular Structure Center USA Bulgarian Academy of Sciences Institute of Organic Chemistry Sofia Bulgaria Chinese Academy of Sciences Institute of Biophysics Beijing China Novartis Pharma AG Preclinical Research Basel Switzerland Department of Chemical Sciences Tata Institute of Fundamental Research Mumbai India Solid State Physics Div

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AN INVESTIGATION OF THE EFFECTS OF LAYER THICKNESS ON THE FRACTURE BEHAVIOR OF LAYERED NiAl/V COMPOSITES

AN INVESTIGATION OF THE EFFECTS OF LAYER THICKNESS ON THE FR...

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ASME 1998 International Mechanical engineering Congress and Exposition, IMECE 1998

作者： Li, M. Wang, R. Katsube, N. Soboyejo, W.O. Department of Materials Science and Engineering The Ohio State University 2041 College Road ColumbusOH43210 United States Applied Mechanics Section Department of Aerospace Engineering Applied Mechanics and Aviation 155 West Woodruff Avenue ColumbusOH43210 United States

ISBN: (纸本)9780791816097

The effect of vanadium layer thickness (100, 200 and 400 pm) on the resistance curve behavior of NiAl/V microlaminates are examined in this paper. The fracture resistance of the NiAl/V microlaminates is shown to increase with increasing layer thickness. The improved fracture toughness (compared to that of unreinforced NiAl) is associated with crack bridging and the interactions of cracks with vanadium layers. The re-initiation of cracks in adjacent NiAl layers is modeled using finite element methods. The re-initiation is shown to occur as a result of strain concentrations at the interface between the adjacent NiAl layers and vanadium layers. The initial deviation of the re-initiated cracks from the pure mode I direction is shown to occur in the direction of maximum shear strain. Toughening due to crack bridging is also modeled using finite element models of the observed crack/microstructure profiles. © 1998 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Binary alloys

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