Results 131 to 140 of about 678 (166)

Micromechanics of Defects in Solids

2012
Preface Numerical simulation of intergranular and transgranular crack propagation in ferroelectric polycrystals Microstructure and stray electric fields at surface cracks in ferroelectrics Double kink mechanisms for discrete dislocations in BCC crystals The expanding spherical inhomogeneity with transformation strain A new model of damage: a moving ...
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Micromechanics of Damage Evolution in Solid Propellants

2008
Solid propellants are composite materials with complex microstructure. In a generic form, the material consists of polymeric binder, ceramic oxidizer, and fuel particles (e.g. aluminum). Damage induced by severe stress and extreme temperatures is manifested in particle cracking, decohesion along particle/polymer interfaces, void opening or even polymer
N. Aravas, F. Xu, P. Sofronis
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Size effects and micromechanics of a porous solid

Journal of Materials Science, 1983
The rigidity of rods of a polymeric foam in bending and torsion is measured as a function of diameter. The dependence of rigidity upon specimen size is found to be inconsistent with a classically viscoelastic continuum model. The Cosserat continuum, which admits additional degrees of freedom associated with rotation of the microstructure, describes the
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Micromechanics of Damage in Brittle Solids

2003
This chapter deals with microcrack damage models of brittle deformation in rocklike solids under quasi-static loading. Starting with basic mechanisms of microcrack growth under tension and compression, non-linear stress-strain relationships are derived within the thermodynamic framework with microstructural internal variables. Illustrative examples are
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Electrostatic transducers for micromechanical resonators: free space and solid dielectric

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2006
Three electrostatic transduction methods are analyzed for a micromechanical, longitudinal mode, beam resonator. The conventional parallel plate transducer placed at the location of maximum displacement is compared to two solid, dielectric transducers internal to the resonator. Although the solid dielectric offers higher permittivity than the free-space-
Kaajakari, V., Alastalo, A.T., Mattila, T.   +3 more
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A micromechanical model of phase boundary movement during solid-solid phase transformations

Archive of Applied Mechanics (Ingenieur Archiv), 2001
The authors study the propagation of a thermally induced solid-solid phase transformation front in an elastic-plastic medium. A spherically symmetric configuration is considered: a spherically transformed region, starting from a nucleus of a given radius, is embedded into an elastic-plastic infinite solid. The same mechanical and thermal properties are
Fischer, F. D., Oberaigner, E. R.
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On the Form of Micromechanical Models of the Brittle Deformation of Solids

1991
The present paper offers a cursory review of the state-of-art in analytical modelling of brittle response. The discussion is formally divided to considerations of discrete (statistical) and continuum (micromechanical and phenomenological) models. An effort was made to point out the relations between these three classes of models and ascertain the ...
D. Krajcinovic, M. Basista
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Micromechanical Considerations in Shock Compression of Solids

1993
The application of what is commonly known as solid continuum mechanics has been very successful in descriptions of the shock-compression process. It has given us the jump conditions, useful concepts of average quantities such as density and specific internal energy (for example), and constitutive descriptions (including equations of state) involving ...
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On the micromechanical theories of stressinduced cleavage microcracking in crystalline solids

Engineering Fracture Mechanics, 1987
Abstract This paper is entirely dedicated to the subject of cleavage microfracture in crystalline solids at non-elevated temperatures. The significance of microcracking in determining the mechanical and fracture characteristics of crystalline solids is outlined.
M. Sarfarazi, S.K. Ghosh
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Rate-Sensitive Micromechanical Damage Model for Brittle Solid

Journal of Engineering Mechanics, 1996
A micromechanical damage model for a brittle solid capable of taking into account the effect of high loading rate (in the form of stress-rate) is presented. Although, this model is applicable to any particulate brittle solid, concrete is given primary consideration.
Dipankar Chandra, Theodor Krauthammer
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