Acta Mechanica
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Poroviscoelastic analysis of borehole and cylinder problems
Acta Mechanica - Tập 119 - Trang 199-219 - 1996
This paper addresses the phenomena of mechanical creep and deformation in rock formations, coupled with the hydraulic effects of fluid flow. The theory is based on Biot's poroelasticity, generalized to encompass viscoelastic effects through the correspondence principle. Based on the resultant poroviscoelastic theory, stress and deformation analyses are performed. The interactions between the fluid...... hiện toàn bộ
Deep energy method in topology optimization applications
Acta Mechanica - Tập 234 - Trang 1365-1379 - 2022
This paper explores the possibilities of applying physics-informed neural networks (PINNs) in topology optimization (TO) by introducing a fully self-supervised TO framework based on PINNs. This framework solves the forward elasticity problem by the deep energy method (DEM). Instead of training a separate neural network to update the density distribution, we leverage the fact that the compliance mi...... hiện toàn bộ
Bifurcation analysis of the triaxial test on sand samples
Acta Mechanica - Tập 32 - Trang 35-54 - 1979
A bifurcation analysis of a strain hardening dilatant sand sample in the triaxial test is carried out. The analysis shows that the triaxial test yields only then the limiting soil properties if 1) the sample is compact enough and 2) if the confining pressure does not exceed a critical value depending on the soil anisotropy and the slenderness of the sample.
Zur Berechnung der Eigenspannungen bei einem durch endliche Biegung verformten inkompressiblen Plattenstreifen
Acta Mechanica - Tập 8 - Trang 146-159 - 1969
Die Eigenspannungen eines inkompressiblen Plattenstreifens, der elastisch-plastisch durch endliche Biegung verformt wird, werden ermittelt. Es zeigt sich, daß die sich ergebenden Eigenspannungen in hinreichender Genauigkeit auch mit Hilfe eines Superpositionsprinzips ermittelt werden können, indem man dem am Ende der Belastung sich ergebenden Spannungszustand die Spannungen einer elastischen Biegu...... hiện toàn bộ
A mesoscopic numerical analysis for combustion reaction of multi-component PBX explosives
Acta Mechanica - Tập 229 - Trang 2267-2286 - 2018
A mesoscopic combustion reaction model of multi-component PBX explosives by using a coupled thermo-mechanical constitutive model is studied. Thereinto, based on the heat balance equation, the present temperature can be calculated; the changing physical state of different materials is described by establishing different equations of state, and based on specially appointed constitutive equations, th...... hiện toàn bộ
Experimental and numerical investigation of the flow in a cylindrical cavity with an unsteady rotating lid
Acta Mechanica - Tập 233 - Trang 1107-1124 - 2022
In this paper, we analyse the flow in a cylindrical cavity of aspect ratio H/R = 2, with a top lid rotating with a sinusoidal time-varying speed. The Reynolds numbers, based on the time-averaged rotating speed and the radius of the cavity (Re =
$$ \Omega _0 R^2/\nu $$
) are 2800, 3500 and 4100. Par...... hiện toàn bộ
Dynamic analysis for a vertical interface crack and the nearby circular cavity located at the piezoelectric bi-material half-space under SH-waves
Acta Mechanica - Tập 232 - Trang 1113-1129 - 2021
The present problem aims to study the scattering behavior of SH-waves by a circular cavity near two symmetrically permeable interface cracks in the piezoelectric bi-material half-space. The steady-state response of the problem is obtained, with the aid of the Green’s function method and the complex function method. Above all, the essential expression of Green’s function is constructed by the mirro...... hiện toàn bộ
Effective anti-plane properties of piezoelectric fibrous composites
Acta Mechanica - Tập 224 - Trang 2719-2734 - 2013
Anti-plane shear of piezoelectric fibrous composites is theoretically investigated. The geometry of composites is described by the 2-dimensional geometry in a section perpendicular to the unidirectional fibers. The previous constructive results obtained for scalar conductivity problems are extended to piezoelectric anti-plane problems. First, the piezoelectric problem is written in the form of the...... hiện toàn bộ
Mechanics of damage processes in series and in parallel: a conceptual framework
Acta Mechanica - Tập 223 - Trang 1863-1878 - 2012
A conceptual framework for damage processes in materials is presented. In this framework, the mechanics of damage processes in materials is investigated. These processes are categorized into either damage processes described in terms of stiffness degradation or damage processes described in terms of cross-sectional area reduction. Furthermore, the damage processes are visualized to occur as sequen...... hiện toàn bộ
Vertical motion of a sphere in an electrically conducting, stratified, diffusive medium
Acta Mechanica - - 1987
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