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  • 1
    Electronic Resource
    Electronic Resource
    Numerical Study of the Effect of Tool Wear on Burr Formation in Blanking Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 53-54 (July 2008), p. 95-100 
    Details
    ISSN: 1662-8985
    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: Numerical simulation of the blanking process of a sheet metal, i.e. the formation ofroll-over and a burnished surface, and crack initiation and propagation, is done using an elastic plasticfinite element model. The Normalized Cockcroft and Latham’s expression is used as a ductile fracturecriterion. Numerical study was conducted to investigate how the tool-wear affects the burr height byvarying the punch nose radius. The simulation results obtained under the effect of the same processvariables are in good agreement with the experimental results. Six punches with various nose edges,0.00mm, 0.05mm, 0.10mm, 0.20mm, 0.30mm and 0.40mm were used for blanking simulations. Theresults indicate that the burr height is directly proportional to the punch nose radius
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.53-54.95.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical Simulation of 3-D Fracture Behaviors on the FRP-Strengthened Concrete Structures (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 423-426 
    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: A numerical code RFPA3D (Realistic Failure Process Analysis) is used to simulate the crackinitiation and propagation in FRP-strengthened concrete beam under external loading. In our model,the FRP-strengthened concrete is assumed to be a three-phase composite composed of concrete, FRP,and interface between them. The displacement-controlled loading scheme is used to simulate thecomplete failure process of FRP-strengthened concrete the numerical simulation of failure process ofthe specimens. It is found that the main failure mode is the interfacial debonding and the interfacialdebonding may propagate either within the adhesive layer or through concrete layer in the vicinity ofbond interface. The simulation results agree well with the experiment observations. The width of theFRP sheet is considered an important factor not only to significantly influence the debondingpropagation type and crack distribution but also to control the ultimate load-capacity and ultimatestrain. This study is focused on the failure process of the FRP-strengthened concrete beam and theeffects of the width of FRP sheet on the failure mode and on the structural load-carrying capacity ofconcrete structures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.423.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Constitutive Modeling for Uniaxial Time-Dependent Ratcheting of SS304 Stainless Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 817-822 
    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: Based on the experimental results of uniaxial time-dependent ratcheting behavior ofSS304 stainless steel at room temperature and 973K, three kinds of time-dependent constitutivemodels were employed to describe such time-dependent ratcheting by using the Ohno-Abdel-Karimkinematic hardening rule, i.e., a unified viscoplastic model, a creep-plasticity superposition modeland a creep-viscoplasticity superposition model. The capabilities of such models to describe thetime-dependent ratcheting were discussed by comparing with the corresponding experimentalresults. It is shown that the unified viscoplastic model cannot provide reasonable simulation to thetime-dependent ratcheting, especially to those with certain peak/valley stress hold and at 973K; theproposed creep-plasticity superposition model is reasonable when the creep is a dominant factor ofthe deformation, however, it cannot provide a reasonable description when the creep is weak; thecreep-viscoplastic superposition model is reasonable not only at room temperature but also at hightemperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.817.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Polyphosphoric acid catalyzed conversion of 3-(methoxyphenyl)propionic acids to derivatives of [3.3]metacyclophane-1,10-diones and 1-indanones (1993)
    s.l. : American Chemical Society
    The @journal of organic chemistry 58 (1993), S. 556-559 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00055a005
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  • 5
    Electronic Resource
    Electronic Resource
    Finite Element Simulation for Tensile Properties of δ-Al2O3f/Al Alloy Composites with Thermal Residual Stress Considered (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 1270-1276 
    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: First, the characteristics of thermal residual stress in randomly oriented short δ-Al2O3 fiber reinforced aluminum alloy composites were analyzed by an elasto-plastic finite element method regarding the effect of the variation in short fiber orientation. Then, the effective moduli and initial tensile stress-strain curves of the composites were simulated by finite element method with the thermal residual stress taken into account. It is concluded that the simulated results obtained with thermal residual stress contained agree with corresponding experimental results better than those obtained in thermal residual stress-free cases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.1270.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Crack Development in Reinforced Concrete Structures under Eccentric Loading (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 2654-2659 
    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: Reinforced concrete structures are generally designed to allow cracking under service loading. Accurate modeling of crack formation and propagation at lower load levels is therefore important. In this paper, a Material Failure Process Analysis code (MFPA2D) is used to model the crack initiation and propagation in reinforced concrete bridge pier subjected to eccentric loading. In our numerical model, the reinforced concrete is assumed to be a three-phase composite composed of concrete, reinforcement and interfaces between them. Numerically obtained results of cracking loads and global load-displacement response agree well with experimentally measured values. It has been found that the fracture of the concrete observed at the macroscopic level is predominated by tensile damage at the mesoscopic level
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.2654.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Element Size on Rock Shear Strength and Failure Pattern by Rock Failure Progress Analysis (RFPA〈sup〉2D〈/sup〉) (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 2573-2578 
    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: Six types of numerical specimens containing two notches are set up to numericallyinvestigate the effect of element size on rock shear strength and failure pattern using RFPA2D (rock failure process analysis) code. These specimens are of the same geometrical dimension 180 mm×180 mm and have been discretized into 61×61, 122×122, 183×183, 244×244, 305×305, and 366×366 elements.The width of notches is about 2.95 (180/61) mm and the length is 45mm. The specimens are placed in a direct shear box. A lateral confining pressure with a value of 0.15MPa is invariably loaded in the vertical direction and an increasing horizontal displacement with 0.002mm/step is applied in the horizontal direction. The whole shear failure progress and associated stress field for the specimens are visually represented. Results show that the crack propagation is mostly influenced by the stress field in the vicinity of the notch tip, the required element size would be necessary in order to obtain good results. In general, for a coarse mesh, the stress field close to the notch tip can’t be represented accurately and shear strength obtained by such discretisation is slightly higher than the accurate value. For a fine mesh, the notch tip spreads through a relatively large number of elements and the stress field in vicinity of notch tip is well represented by the finite element approximation, therefore the failure pattern is consistent with real physical fracture mode
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.2573.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Numerical Approach to Fracture Spacing in Two Layered Material (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 750-755 
    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: Equally spaced opening-mode fractures always evolve in top layer attached to underlying layer. With a newly developed Material Failure Process Analysis code (MFPA2D), we have firstly investigated the stress distribution between two adjacent fractures as a function of the fracture-spacing-to-layer-thickness ratio using a two-layer model with a fractured top layer. The numerical results indicate the horizontal stress perpendicular to the fractures near the top surface changes from tensile to compressive when the fracture-spacing-to-layer-thickness ratio changes from greater than to less than a critical value. Then, the process from fracture initiation to fracture saturation is numerically modeled. The modeling of fracture process shows that the fractures initiate at the top surface and propagate to the interface between the two layers in the first stage. In the following stage, new fractures can infill between the earlier formed fractures and they always initiateat the interface and propagate to the top surface. Numerical simulation clearly demonstrates that the stress state transition precludes further infilling of fractures and the fracture spacing reaches a constant state, i.e. the so-called fracture saturation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.750.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Implementation of a Mesoscopic Mechanical Model for the Shear Fracture Process Analysis of Masonry (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 1025-1031 
    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 short paper will present a two-dimensional (2D) model of masonry material. This mesoscopic mechanical model is suitable to simulate the behavior of masonry. Considering the heterogeneity of masonry material, based on the damage mechanics and elastic-brittle theory, the new developed Material Failure Process Analysis (MFPA2D) system was brought out to simulate the cracking process of masonry, which was considered as a three-phase composite of the block phase,the mortar phase and the block-mortar interfaces. The crack propagation processes simulated with this model shows good agreement with those of experimental observations. It has been found that the shear fracture of masonry observed at the macroscopic level is predominantly caused by tensile damage at the mesoscopic level. Some brittle materials are so weak in tension relative to shear that tensile rather than shear fractures are generated in pure shear loading
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.1025.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Numerical Simulation of 3-D Failure Process of Reinforced Concrete Specimen under Uniaxial Tension (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 949-952 
    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 periodically distributed fracture spacing phenomenon exists in the failure process ofthe reinforced concrete prism under uniaxial tension. In this paper, A numerical code RFPA3D (3DRealistic Failure Process Analysis) is used to simulate the three-dimensional failure process of plainconcrete prism specimen and reinforced concrete prism specimen under uniaxial tension. Thereinforced concrete is represented by a set of elements with same size and different mechanicalproperties. They are uniform cubic elements and their mechanical properties, including elasticmodulus and peak strength, are distributed through the specimens according to a certain statisticaldistribution. The elastic modulus and other mechanical properties are weakened gradually when thestresses in the elements meet the specific failure criterion. The displacement-controlled loadingscheme is used to simulate the complete failure process of reinforced concrete. The analyses focus onthe failure mechanisms of the concrete and reinforcement. The complete process of the fracture forthe plain concrete prism and the fracture initiation, infilling and saturation of the reinforced concreteprism is reproduced. It agrees well with the theoretical analysis. Through 3D numerical tests for thespecimen, it can be investigated the interaction between the reinforcement and concrete mechanicalproperties in meso-level and the numerical code is proved to be an effective way to help thoroughlyunderstand the rule of the reinforcement and concrete and also help the design of the structuralconcrete components and systems
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.949.pdf
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