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  • 1
    Electronic Resource
    Electronic Resource
    Brittle-damage analysis of cracks under conditions of plane-strain tensile loading (1995)
    Springer
    Acta mechanica solida Sinica 8 (1995), S. 15-23 
    Details
    ISSN: 0894-9166
    Keywords: brittle damage ; damage process zone ; element vanish technique ; fracture toughness increment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An abrupt damage model, taking full account of finite geometrychanges, is used to study both the shapes of damage zones and the stress strain fields for a plane-strain tensile crack under the small-scale yielding condition. Two typical crack-tip damage profiles are simulated by the element vanish technique. The fracture toughness increment due to damage dissipation is evaluated in terms of the energy release rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207896
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  • 2
    Electronic Resource
    Electronic Resource
    Defect assessment procedure based on ductile tearing process (1987)
    Springer
    Acta mechanica Sinica 3 (1987), S. 344-353 
    Details
    ISSN: 1614-3116
    Keywords: defect assessment ; strain hardening ; crack growth ; ductile tearing process ; theoretical resistance curves ; nonuniform strain distribution ; design curve
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Strain hardening, crack growth resistance and nonuniform load distribution have significant effects on the ductile tearing process. A defect assessment procedure incorporating with the above features is proposed in the present paper, with the final appearance of “design curves” to facilitate engineering applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486820
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  • 3
    Electronic Resource
    Electronic Resource
    Bridging toughening of epoxy resins by dispersed thermoplastics (1989)
    Springer
    Acta mechanica Sinica 5 (1989), S. 332-342 
    Details
    ISSN: 1614-3116
    Keywords: bridging model ; toughening ; crack pinning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The particulate toughening behaviour of epoxy resins modified by ductile thermoplastics is elucidated here by various bridging models. The experimental data for three different epoxy/PSF systems are presented to illustrate the trend of the toughening characteristics. The conventional continuous bridging model is shown to have underestimated the effect of the particulate toughening. Ajoint application of the discrete bridging model and the multiple bridging model, however, shows promising result for modified epoxy systems such as AG80/DDS/PSF and E51/DDS/PSF. These models also provide quantitative descriptions for the crack pinning phenomenon previously observed by Fu and Sun[1] in AG80/DDS/PSF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02488006
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  • 4
    Electronic Resource
    Electronic Resource
    On the description of anisotropic damage in composite laminates (1991)
    Springer
    Acta mechanica Sinica 7 (1991), S. 335-341 
    Details
    ISSN: 1614-3116
    Keywords: composite laminates ; anisotropic damage ; constitutive modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A general anisotropic damage theory of cracked laminates is formulated here. The deformation of composite laminates is composed of matrix elastic strains, pseudo-elastic damage strains due to cracking and permanent damage strains due to interlaminar slip. The surface of damage initiation is constructed according to the concept of linear elastic fracture mechanics for the virgin material. After the initial damage, a pesudo-elastic damage can be used to describe the damage behaviour if interlaminar slip is negligible. Damage evolution, load induced anisotropy and interlaminar intralaminar interaction for composite laminates are examined; the latter can perturb the normality structure of damage strain rate. Explicit expressions are given for pseudo-elastic (or secant) moduli of the damaging composite laminates, under a non-interacting assumption imposed on the cracks between different families.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486741
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  • 5
    Electronic Resource
    Electronic Resource
    Micro-experimental study of large plastic deformation for high-purity polycrystalline aluminum (1991)
    Springer
    Acta mechanica Sinica 7 (1991), S. 360-368 
    Details
    ISSN: 1614-3116
    Keywords: polycrystals ; large plastic deformation ; grain boundary sliding ; micromechanics ; grid method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper aims at revealing various micro- deformation characteristics, such as crystalline slip and grain boundary slide, which are recorded under scanning electronic microscope for high-purity aluminum tensile specimen at room temperature. These experimental data provide us direct evidence for shear localization near the grain boundary network via multi- directional grain boundary slide. The nonuniform deformation induced in the grain interiors would have decisive effect on the plastic flow and failure of polycrystalline materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486745
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  • 6
    Electronic Resource
    Electronic Resource
    Post-microbuckling of fibre bridging kink bands under compression (1993)
    Springer
    Acta mechanica Sinica 9 (1993), S. 33-43 
    Details
    ISSN: 1614-3116
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Surface originated kink bands consist of an important failure mode for fibre-reinforced composites under compression. The mechanical behavior of the fibre bridging kink bands is explored herein in the context of the post-microbuckling theory. Expressions of bridging force are obtained for the entire postbuckling process of the fibres exhibiting weak or strong hardening. The postbuckling formulation of the fibres is applied to yield the toughness increment due to the advancing kink bands, and consequently leads to a quantitative prediction on the overall compressive stress strain curves of the fibre-reinforced composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02489160
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  • 7
    Electronic Resource
    Electronic Resource
    Atomistic/continuum simulation of interfacial fracture part I: Atomistic simulation (1994)
    Springer
    Acta mechanica Sinica 10 (1994), S. 150-161 
    Details
    ISSN: 1614-3116
    Keywords: interfacial fracture ; atomistic simulation ; mode mixity ; loading rate ; zigzag interface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The phenomenon of interfacial fracture, as manifested by atomistic cleavage, debonding and dislocation emission provides a challenge for combined atomistic-continuum analysis. As a precursor for fully coupled atomistic-continuum simulation[1] of interfacial fracture, we focus here on the atomistic behavior within a nanoscopic core surrounding the crack tip. The inter-atomic potential under Embedded Atom Method is recapitulated to form an essential framework of atomistic simulation. The calculations are performed for a side-cracked disc configuration under a remoteK field loading. It is revealed that a critical loading rate defines the brittle-to-ductile transition of homogeneous materials. We further observe that the near tip mode mixity dictates the nanoscopic profile near an interfacial crack tip. A zigzag interface structure is simulated which plays a significant role in the dislocation emission from an interfacial crack tip, as will be explored in the second part of this investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486585
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  • 8
    Electronic Resource
    Electronic Resource
    Global view of microstructural evolution: Energetics, kinetics and dynamical systems (1996)
    Springer
    Acta mechanica Sinica 12 (1996), S. 144-157 
    Details
    ISSN: 1614-3116
    Keywords: microstructural evolution ; energetics ; kinetics ; dynamic system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An evolving material structure is in a non-equilibrium state, with free energy expressed by the generalized coordinates. A global approach leads to robust computations for the generalized thermodynamic forces. Those forces drive various kinetic processes, causing dissipation at spots, along curves, surfaces and interfaces, and within volumetric regions. The actual evolution path, and therefore the final equilibrium state, is determined by the energetics and kinetics. A virtual work principle links the free energy landscape and the kinetic processes, and assigns a viscous environment to every point on the landscape. The approach leads to a dynamical system that governs the evolution of generalized coordinates. The microstructural evolution is globally characterized by a basin map in the coordinate space; and by a diversity map and a variety map in the parameter space. The control of basin boundaries raises the issue of energetic and kinetic bifurcations. The variation of basin boundaries under different sets of controlling parameters provides an analytical way to plot the diversity maps of structural evolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486793
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  • 9
    Electronic Resource
    Electronic Resource
    Atomistic/continuum simulation of interfacial fracture Part II: Atomistic/dislocation/continuum simulation (1994)
    Springer
    Acta mechanica Sinica 10 (1994), S. 237-249 
    Details
    ISSN: 1614-3116
    Keywords: interfacial fracture ; atomistic/continuum simulation ; mechanics atmosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Coupled atomistic/dislocation/continuum simulation of interfacial fracture is performed in this paper. The model consists of a nanoscopic core made by atomistic assembly and a surrounding elastic continuum with discrete dislocations. Atomistic dislocations nucleate from the crack tip and move to the continuum layer where they glide according to the dislocation dynamics curve. An atoms/continuum averlapping belt is devised to facilitate the transition between the two scales. The continuum constraint on the atomic assembly is imposed through the mechanics atmosphere along the overlapping belt. Transmissions of mechanics parameters such as displacements, stresses, masses and momenta across the belt are realized. The present model allows us to explore interfacial fracture processes under different mode mixity. The effect of atomistic zigzag interface on the fracture process is revealed: it hinders dislocation emission from the crack tip, especially under high mode mixity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02487612
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  • 10
    Electronic Resource
    Electronic Resource
    Toughness increment by crack growth in toughened structural materials (1991)
    Springer
    Acta mechanica Sinica 7 (1991), S. 131-139 
    Details
    ISSN: 1614-3116
    Keywords: material toughening ; crack growth ; bridging ; dilatational plasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Material toughening could be furnished by the energy dissipating wakes and bridging segments during crack growth. According to their contributions to the energy integral applicable to a growing crack, the toughening mechanisms are categorized as: dilatational plasticity and induced shear yielding in the crack wakes, bridging due to second inclusion phases, and the matrix bridging caused by wavy crack front. Detailed toughening analysis is pursued for structural polymers and composite materials reinforced by short aligned fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486840
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