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  • 11
    Electronic Resource
    Electronic Resource
    Hybrid Special Finite Element Method for Bi-Material Crack (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 312 (June 2006), p. 95-104 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the paper, two novel 2-D hybrid special finite elements each containing an interfacial edge crack, which lies along or vertical to the interface between two materials, are developed. These proposed elements can assure the high precision especially in the vicinity of crack tip and provide a better description of its singularity with only one hybrid element surrounding one interfacial crack, thus, the numerical modeling of fracture analysis on bi-material crack can be greatly simplified.Numerical examples are provided to demonstrate the validity and versatility of the proposed method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.312.95.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    Evaluation of Hole Flangeability of Steel Sheet with Respect to the Hole Processing Condition (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 665-670 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper is concerned with hole flangeability of steel sheet, which is evaluated byexperiment and finite element analysis with respect to the hole processing condition. The holeflangeability of a material as a forming limit needs to be verified to predict and prevent theundesirable fracture during a flanging process. Hole expanding tests are carried out to identify theeffect of hole processing conditions on the hole expanding ratio (HER), which is an indicator of thehole flangeability. Specimens with two different hole conditions are prepared: one is produced withpunching process; and the other is reamed after punching to get smoother hole surface. Experimentalresults show that the facture mechanism and the HER are quite different with respect to the holeconditions. Thorough investigation of those effects is carried out with tensile tests of a specimen withnotches. From the experiments, the fracture strain is obtained with different hole conditions and isused to determine the material constants of a new proposed ductile fracture criterion which is appliedto finite element analyses of the hole flanging process for prediction of the HER. The experimentalresults are confirmed and reevaluated by the finite element analysis with the ductile fracture criterion
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.665.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Finite Element Analysis of Room Temperature Nanoimprint Lithography Process with Rate Dependent Plasticity (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 505-507 (Jan. 2006), p. 85-90 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nanoimprint lithography (NIL) process at the room temperature has been proposed newly to achieve the shape accuracy and to overcome the sticking problem induced in conventional NIL processes. Success of the room temperature NIL relies on the complete understanding of the mechanical behavior of the polymer. Since a conventional NIL process has to heat a polymer above the glass transition temperature to deform the physical shape of the polymer with a mold pattern,visco-elastic properties of the polymer have major effect on the NIL process. The rate dependent behavior of the polymer is also important in the room temperature NIL process because a mold is rapidly pressed onto the polymer while there has been no study on the rate-dependent NIL process. In this paper, finite element analysis of the room temperature NIL process is performed with the consideration of the strain-rate dependent behavior of the polymer. The analyses with the variation ofthe imprinting speed and the imprinting pattern are carried out in order to investigate the effect of the process parameters on the room temperature NIL process. The analysis results show that the deformed shape and the imprinting force are diversified with the variation of the imprinting speed due to the dynamic behavior of the polymer with the rate dependent plasticity model. The results provide aguideline to determine the process conditions in the room temperature NIL process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.505-507.85.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Petroleum Separation through Polymer Blend Membranes Using Pervaporation (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 486-487 (June 2005), p. 432-435 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Utilization of membrane offers the promise of huge energy savings if successfully applied to petroleum separations. Membranes are bound to enter into refining petroleum operations involving liquid separations once appropriate materials and modules are developed. Hybrid processes such as utilizing membrane modules to azeotropes formed during distillation are particularly attractive because they can offer less process complexity and reduced capital investment. A pervaporationperformance was studied using pervaporation through the polymer blendmembranes for the separation of benzene and cyclohexane mixtures to investigate the relationship between pervaporation performance and polymer blend design. Solubility parameter calculation and thermodynamic calculation were used to predict the pervaporation performance for the benzene and cyclohexane mixture system using polymeric blend membrane composed of NBR, PVC and polar copolymers with various solubility parameters. The solubility parameter of the polymer blendmembranes were controlled with different blend ratio. Screening of the membranes was accomplished by simple swelling experiments. Selectivity for the polar component increased with increasing NBR and PVC contents. Solubility parameter from polar and hydrogen bonding properties and activity calculated from thermodynamic model predicted the trend of swelling characteristics andpervaporation performance. Solubility parameter and thermodynamic calculation provide an a priori methodology for seeking the best blend formulations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.486-487.432.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    Finite Element Analysis of the Hydro-Mechanical Punching Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 505-507 (Jan. 2006), p. 871-876 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper investigates the characteristics of a hydro-mechanical punching process. The hydro-mechanical punching process is divided into two stages: the first stage is the mechanical half piercing in which an upper punch goes down before the initial crack is occurred; the second stage is the hydro punching in which a lower punch goes up until the final fracture is occurred. Ductile fracture criteria such as the Cockcroft et al., Brozzo et al. and Oyane et al. are adopted to predict the fracture of a sheet material. The index value of ductile fracture criteria is calculated with a user material subroutine, VUMAT in the ABAQUS[removed info] Explicit. The hydrostatic pressure retards the initiation of a crack in the upper region of the blank and induces another crack in the lower region of the blank during the punching process. The final fracture zone is placed at the middle surface of theblank to the thickness direction. The result demonstrates that the hydro-mechanical punching process makes a finer shearing surface than the conventional one as hydrostatic pressure increases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.505-507.871.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Dynamic Tensile Characteristics of TRIP-Type and DP-Type Sheets for an Auto-Body (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 255-262 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper investigates the dynamic tensile characteristics of TRIP600, TRIP800, DP600and DP800 at the range of strain rate from 0.003 to 200/s. The tensile test acquires stress−strain curvesand the strain rate sensitivity of each material. Experimental results show two important aspects forTRIP-type and DP-type sheets quantitatively: the flow stress increases as the strain rate increases; theelongation is not a monotonic function of the strain rate and increases at the same level of the strainrate even when the strain rate increases.In order to investigate the pre-strain effect for two types of metals at the high strain rate, TRIP600and DP600 were elongated with the pre-strain of 5 and 10% at the strain rate of 0.003/s. Then,dynamic tensile tests were carried out at the strain rate of 0.003, 1, 10 and 100/s. The resultsdemonstrate that the material properties of TRIP600 and DP600 are noticeably influenced by thepre-strain when the strain rate was over 1/s. The ultimate tensile strength as well as the yield stressincreases due to the pre-strain effect
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.255.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    The Effect of Strain Rate on the Material Characteristics of Nickel-Based Superalloy Inconel 718 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 283-288 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The dynamic response of the turbine blade materials is indispensable for analysis oferosions of turbine blades as a result of impulsive loading associated with gas flow. This paper isconcerned with the dynamic material properties of the Inconel 718 alloy which is widely used in thehigh speed turbine blade. The dynamic response at the corresponding level of the strain rate should beacquired with an adequate experimental technique and apparatus due to the inertia effect and thestress wave propagation. In this paper, the dynamic response of the Inconel 718 at the intermediatestrain rate ranged from 1/s to 400/s is obtained from the high speed tensile test and that at the highstrain rate above 1000/s is obtained from the split Hopkinson pressure bar test. The effects of thestrain rate on the dynamic flow stress, the strain rate sensitivity and the failure elongation areevaluated with the experimental results. Experimental results from both the quasi-static and the highstrain rate up to 3000/s are interpolated in order to construct the constitutive relation that should beapplied to simulate the dynamic behavior of the turbine blade made of the Inconel 718
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.283.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    Ginkgolide B production in cultured cells derived from Ginkgo biloba L. leaves (1995)
    Springer
    Plant cell reports 14 (1995), S. 501-504 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Callus cultures and cell suspension cultures derived from Ginkgo biloba L. leaves produced ginkgolidc B. In cell suspension cultures, the production reached a maximum by the 13th day of subculture and followed by a sharp decrease. The medium of Murashige and Skoog induced the highest ginkgolide B content in cultures while the medium of Schenk and Hildebrandt promoted cell growth. For the maximal production of ginkgolide B, cells were cultured in Murashige and Skoog medium modified to contain 1.0 mg/l of α-naphthaleneacetic acid, 0.1 mg/1 of kinetin, 30 g/1 sucrose and 1.25 mM potassium phosphate with a molar ratio of ammonium to nitrate ions of 1 ∶ 3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00232783
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  • 19
    Electronic Resource
    Electronic Resource
    Preparation and permeability of solutes through acrylic acid-g-methylcellulose copolymer membranes (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 47 (1993), S. 917-924 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Graft copolymer membranes from the methylcellulose and the acrylic acid were prepared and their properties and the permeability of four solutes were estimated. Acrylic acid-g-methylcellulose (AA-g-MC) copolymer dissolved in aqueous acetone solvent was cast to prepare membranes followed by the subsequent crosslinking either with aluminium potassium sulfate or by the thermal-curing method. The equilibrium water content in the membrane increased with the volume fraction of acetone in the aqueous acetone solvent system. Membrane, the ionically crosslinked with the aluminum potassium sulfate, showed the water content in the range of 38.5 and 58.4% and 0.25-0.33 kg/mm2 of the tensile strength in the wet state. Compared with ionically crosslinked membranes, thermally dried membranes exhibited a more dense structure, resulting in lower water contents and higher mechanical strength. Experimental results on the permeation of four small and midsize solutes through the graft copolymer membranes revealed the molecular weight dependence of the permeability coefficient. The higher the degree of swelling, the greater the permeability coefficient. Ionically crosslinked membranes had higher solute permeability than the commercial Cuprophane membrane had. © 1993 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070470519
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  • 20
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    Colloidal Adsorption of Bovine Serum Albumin on Porous Polypropylene-g-Poly(2-hydroxyethyl methacrylate) Membrane (2001)
    American Chemical Society
    Details
    Publication Date: 2001-07-01
    Print ISSN: 0743-7463
    Electronic ISSN: 1520-5827
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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