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  • 1
    Electronic Resource
    Electronic Resource
    A finite deformation analysis of polycrystal by considering the influence of grain boundary (1996)
    Springer
    Acta mechanica solida Sinica 9 (1996), S. 189-200 
    Details
    ISSN: 0894-9166
    Keywords: grain boundary ; slip ; slid ; crystal plasticity ; finite deformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract By combining grain boundary (GB) and its influence zone, a micromechanic model for polycrystal is established for considering the influence of GB. By using the crystal plasticity theory and the finite element method for finite deformation, numerical simulation is carried out by the model. Calculated results display the microscopic characteristic of deformation fields of grains and are in qualitative agreement with experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02208302
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  • 2
    Electronic Resource
    Electronic Resource
    The near tip stress and strain fields in cracked single crystals (1994)
    Springer
    Acta mechanica Sinica 10 (1994), S. 250-259 
    Details
    ISSN: 1614-3116
    Keywords: single crystal ; crack ; stress field ; finite element
    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 numerical analyses of stationary mathematically sharp Mode I crack in FCC and BCC crystals with elastic-ideally plastic (EIP) and fast hardening saturation (FHS) law are carried out in the present paper. From the calculated results, it is shown that: for the cases of small strain, EIP crystal cracks, the features of concentrated deformation patterns and the stress state in near-crack tip deformation fields are identical to the earlier analytical solutions, but along the angular sector boundaries, there exist narrow complex stress zones. The overall characteristics of deformation patterns for the cases of EIP and FHS are similar. The behaviours of crack tip opening can be characterized by crack-tip-opening-displacement (CTOD). For the case of FHS, finite deformation BCC crystal crack, our calculations are qualitatively in agreement with recent experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02487613
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  • 3
    Electronic Resource
    Electronic Resource
    Micromechanics analyses of interface crack (1996)
    Springer
    Acta mechanica Sinica 12 (1996), S. 47-54 
    Details
    ISSN: 1614-3116
    Keywords: micromechanics ; interface crack ; toughness
    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 new mechanics model based on Peierls concept is presented in this paper, which can clearly characterize the intrinsic features near a tip of an interfacial crack. The stress and displacement fields are calculated under general combined tensile and shear loadings. The near tip stress fields show some oscillatory behaviors but without any singularity and the crack faces open completely without any overlapping when remote tensile loading is comparable with remote shear loading. A fracture criterion for predicting interface toughness has been also proposed, which takes into account for the shielding effects of emitted dislocations. The theoretical toughness curve gives excellent prediction, as compared with the existing experiment data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486761
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  • 4
    Electronic Resource
    Electronic Resource
    A crack perpendicular to and terminating at a bimaterial interface (1998)
    Springer
    Acta mechanica Sinica 14 (1998), S. 27-36 
    Details
    ISSN: 1614-3116
    Keywords: interface ; perpendicular crack ; gerneralized stress intensity factor ; T stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Using dislocation simulation approach, the basic equation for a finite crack perpendicular to and terminating at a bimaterial interface is formulated. A novel expansion method is proposed for solving the problem. The complete solution to the problem, including the explicit formulae for theT stresses ahead of the crack tip and the stress intensity factors are presented. The stress field characteristics are analysed in detail. It is found that normal stresses {ie27-1} and {ie27-2} ahead of the crack tip, are characterised byQ fields if the crack is within a stiff material and the parameters |p T | and |q T | are very small, whereQ is a generalised stress intensity factor for a crack normal to and terminating at the interface. If the crack is within a weak material, the normal stresses {ie27-3} and {ie27-4} are dominated by theQ field plusT stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486828
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  • 5
    Electronic Resource
    Electronic Resource
    A new N-body potential and its application (1996)
    Springer
    Acta mechanica Sinica 12 (1996), S. 358-367 
    Details
    ISSN: 1614-3116
    Keywords: embedded atom method (EAM) ; N-body potential ; dislocation emission ; molecular dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Based on the embedded atom method (EAM) proposed by Daw and Baskes and Johnson's model, this paper constructs a new N-body potential for bcc crystal Mo. The procedure of constructing the new N-body potential can be applied to other metals. The dislocation emission from a crack tip has been simulated successfully using molecular dynamics method, the result is in good agreement with the elastic solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02487801
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  • 6
    Electronic Resource
    Electronic Resource
    Elastic-plastic constitutive relation of particle reinforced composites (1999)
    Springer
    Acta mechanica Sinica 15 (1999), S. 344-354 
    Details
    ISSN: 1614-3116
    Keywords: cell model ; elastic-plastic ; constitutive relation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this paper, a systematic approach is proposed to obtain the macroscopic elastic-plastic constitutive relation of particle reinforced composites (PRC). The strain energy density of PRC is analyzed based on the cell model, and the analytical formula for the macro-constitutive relation of PRC is obtained. The strength effects of volume fraction of the particle and the strain hardening exponent of matrix material on the macro-constitutive relation are investigated, the relation curve of strain versus stress of PRC is calculated in detail. The present results are consistent with the results given in the existing references.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02487932
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  • 7
    Electronic Resource
    Electronic Resource
    Effective elastic moduli of inhomogeneous solids by embedded cell model (1999)
    Springer
    Acta mechanica Sinica 15 (1999), S. 334-343 
    Details
    ISSN: 1614-3116
    Keywords: embedded cell model ; effective elastic moduli ; crack ; inclusion
    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 embedded cell model is presented to obtain the effective elastic moduli for three-dimensional two-phase composites which is an exact analytic formula without any simplified approximation and can be expressed in an explicit form. For the different cells such as spherical inclusions and cracks surrounded by sphere and oblate ellipsoidal matrix, the effective elastic moduli are evaluated and the results are compared with those from various micromechanics models. These results show that the present model is direct, simple and efficient to deal with three-dimensional two-phase composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02487931
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  • 8
    Electronic Resource
    Electronic Resource
    Stress field of a damaged material near the crack tip (1987)
    Springer
    Acta mechanica Sinica 3 (1987), S. 231-238 
    Details
    ISSN: 1614-3116
    Keywords: damaged materials ; deformation theory of plasticity ; asymptotic expression ; crack tip ; stress and strain fields
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this paper, a deformation theory of plasticity for damaged materials is proposed. An asymptotic expression forH near a crack tip is obtained. Finally, the stress and strain fields near the crack tip are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486769
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  • 9
    Electronic Resource
    Electronic Resource
    Constitutive potential for ductile damaged material and void growth rate (1989)
    Springer
    Acta mechanica Sinica 5 (1989), S. 125-135 
    Details
    ISSN: 1614-3116
    Keywords: constitutive potential ; damaged materials ; void growth ; thermodynamics ; irreversible process
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this paper a general formula for plastic potential including isotropic ductile damage has been presented on the basis of the thermodynamics for irreversible process and intemal variable theory. With this formula the mass conservation law is satisfied and it also contains a series of unknow coefficients which are the function of macro equivalent stress and the average micro equivalent stress and an unknown function which is the function of two generalized forces. The approximate yield surface equation for isotropically damaged materials is developed. Using this equation the void growth rate is calculated for nonlinear material containing voids. The present results are in good agreement with the numerical results given by the cell model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02489137
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  • 10
    Electronic Resource
    Electronic Resource
    High-order asymptotic analysis for the crack in nonlinear material (1992)
    Springer
    Acta mechanica Sinica 8 (1992), S. 156-164 
    Details
    ISSN: 1614-3116
    Keywords: asymptotic analysis ; near-crack-tip field ; triaxiality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Accurate high-order asymptotic analyses were carried out for Mode II plane strain crack in power hardening materials. The second-order crack tip fields have been obtained. It is found that the amplitude coefficientk 2 of the second term of the asymptotic field is correlated to the first order field as the hardening exponentn〈n * (n *≈5), but asn≥n *,k 2 turns to become an independent parameter. Our results also indicated that, the second term of the asymptotic field has little influence on the near-crack-tip field and can be neglected whenn〈n *. In fact,k 2 directly reflects the effects of triaxiality near the crack tip, the crack geometry and the loading mode, so that besidesJ-integral it can be used as another characteristic parameter in the two-parameter criterion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02487163
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