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The structural theory of short-term damage is generalized to particulate composites with nonlinearly elastic matrix and microdamageable inclusions. The basis for this generalization is the stochastic elasticity equations for a particulate composite with porous inclusions. Microvolumes of the material meet the Huber-Mises failure criterion. The damaged-microvolume balance equation and the equations relating macrostresses and macrostrains of a particulate composite with porous inclusions and physically nonlinear matrix constitute a closed-form system. This system describes the coupled processes of physically nonlinear deformation and microdamage. Algorithms for computing the microdamage-macrostrain relationships and deformation curves are proposed. Uniaxial tension curves are plotted for a particulate composite with linearly hardening matrix__________Translated from Prikladnaya Mekhanika, Vol. 41, No. 4, pp. 3–11, April 2005. 相似文献
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The bifurcation instability problem for cylindrical shells made of particulate composites with nonlinear elastic matrix and
damaged inclusions is formulated and solved
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Translated from Prikladnaya Mekhanika, Vol. 43, No. 8, pp. 80–91, August 2007. 相似文献
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L. P. Khoroshun I. P. Kostetskii E. N. Shikula 《International Applied Mechanics》1990,26(11):1043-1048
Institute of Mechanics, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Prikladnaya Mekhanika, Vol. 26, No. 11, pp. 24–31, November, 1990. 相似文献
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The theory of microdamageability of fibrous materials with transversely isotropic fibers is stated with account taken of the thermal effect. Microdamages in the isotropic matrix are simulated by pores empty or filled with particles of damaged material that resist compression. The fracture criterion for a microvolume of the matrix is assumed to have the Nadai–Schleicher form, which takes into account the difference between the tensile and compressive ultimate loads, with the ultimate strength being a random function of coordinates with a power or Weibull distribution. The stress–strain state and the effective properties of the material are determined from the thermoelastic equations for fibrous materials with a porous matrix. The deformation and microdamage equations are closed by the equations of porosity balance corrected for the thermal effect. For various types of loading, nonlinear relations are derived for the coupled processes of deformation of a fibrous material and microdamage of the matrix due to the thermal macrostrain. The effect of physical and geometrical parameters on these processes is studied. 相似文献
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The theory of microdamageability of granular composites is stated with allowance made for the thermal effect. Microdamages in the components are modeled by pores, hollow or filled with particles of the destroyed material that resist compression. The fracture criterion is assumed to have the Schleicher–Nadai form, which takes into account the difference between the tensile and compressive ultimate loads, with the ultimate strength being a random function with a power or Weibull distribution. The stress–strain state and effective properties of the material are determined from the stochastic thermoelastic equations for granular composites with porous components. The equations of deformation and microdamage are closed by the equation of porosity balance corrected for the thermal effect. Nonlinear diagrams are plotted for the concurrent processes of deformation of a granular material and microdamage of the matrix as functions of macrostrains and temperature. The influence of the physical and geometrical parameters on the processes is analyzed. 相似文献
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The theory of microdamageability of laminated materials is stated with account taken of the thermal effect. Microdamages in the components are simulated by pores empty or filled with particles of damaged material that resist compression. The fracture criterion is assumed to have the Nadai–Schleicher form, which takes into account the difference between the tensile and compressive ultimate loads, with the ultimate strength being a random function of coordinates with a power or Weibull distribution. The stress–strain state and the effective properties of the material are determined from the thermoelastic equations for laminated materials with porous components. The deformation and microdamage equations are closed by the equations of porosity balance corrected for the thermal effect. For various types of loading, nonlinear relations are derived for the coupled processes of deformation of a two-component laminated material and microdamage due to the thermal macrostrain of a component. The effect of physical and geometrical parameters on these processes is studied. 相似文献
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The problem of bifurcation instability of shells of revolution made of a nonlinear elastic material progressively damaged
under loading is formulated and solved
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Translated from Prikladnaya Mekhanika, Vol. 43, No. 5, pp. 35–45, May 2007. 相似文献
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The structural theory of short-term microdamage is generalized to a fibrous composite with a microdamageable matrix and physically
nonlinear fibers. The basis for the generalization is the stochastic elasticity equations of a fibrous composite with a porous
matrix. Microvolumes in the matrix material meet the Huber-Mises failure criterion. The damaged-microvolume balance equation
for the matrix is derived. This equation and the equations relating macrostresses and macrostrains of a fibrous composite
with porous matrix and physically nonlinear fibers constitute a closed-form system of equations. This system describes the
coupled processes of physically nonlinear deformation and microdamage occurring in different components of the composite.
Algorithms for computing the microdamage-macrostrain and macrostress-macrostrain relationships are developed. Uniaxial tension
curves are plotted for a fibrous composite with linearly hardening fibers
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Translated from Prikladnaya Mekhanika, Vol. 42, No. 1, pp. 38–47, January 2006. 相似文献