ACTA MECHANICA力学学报（英文版）
ACTA MECHANICA(英文缩写 ACTA MECH),ISSN 0001-5970,eISSN 1619-6937,中文译名:力学学报（英文版） 是一本学术期刊。本页汇总该期刊的最新影响因子、分区信息以及最新收录于 PubMed 的文献,帮助您快速了解期刊全貌。
发文量统计区间：2025-11-01 至 2026-10-31，按本站收录文献的发表日期统计。
期刊介绍
历年影响因子趋势
| JCR 数据年份 | 影响因子 | JCR 分区 |
|---|---|---|
| 2021 | 2.645 | Q2 |
| 2022 | 2.700 | Q2 |
| 2023 | 2.300 | Q2 |
| 2024 | 2.900 | Q2 |
| 2025 | 4.000 | Q1 |
ACTA MECHANICA 最新收录文献
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1. Non-degeneracy of coated laminates with a degenerate core.
PMID:日期:2026-05-12Coated laminates arise from sequential lamination, where a core phase is repeatedly embedded into a coating phase along varying lamination directions and volume fractions. For non-degenerate material parameters, explicit formulas for the effective conductivity and stiffness of such microstructures are well established. This work investigates coated laminates with a , including insulating and perfectly conducting phases in thermal conductivity as well as porous and rigid phases in linear elasticity. Motivated by observations in deep material networks, we analyze under which conditions the effective tensors of a coated laminate become non-degenerate despite the degeneracy of the core. We develop an abstract operator-theoretic framework in a Hilbert space setting that encompasses both conductivity and elasticity and allows a unified treatment of vanishing and infinite material parameters. Within this framework, we establish well-posedness of the coating process and derive explicit criteria for non-degeneracy in terms of intersection properties of suitable subspaces. The abstract results are subsequently specialized to thermal conductivity and linear elasticity, where the derived criteria yield explicit conditions for the non-degeneracy.
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2. Orthotropic viscoelastic creep in cellular scaffolds.
2. 细胞支架中的正交各向异性粘弹性蠕变PMID:日期:2025-11-08Recent measurements of Norway spruce have revealed stress-state-dependent normalized creep behavior, highlighting a gap in our fundamental understanding. This study examines whether the anisotropic response originates from the micro-structural, cellular nature of composite cell walls with varying tracheid types. Cell wall creep parameters are identified via surrogate-based inverse parameter determination, applied to hierarchical micro-mechanical and FEM models of increasing topological complexity up to the growth ring scale. Despite microstructural disorder, simulated creep curves converge toward a universal set of proportionality factors. The results indicate that directional creep behavior cannot be attributed solely to tissue scale topology, and that realistic predictions require the inclusion of non-linear material responses at stress concentration sites.
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3. Plane stress finite element modelling of arbitrary compressible hyperelastic materials.
3. 任意可压缩超弹性材料的平面应力有限元建模PMID:日期:2025-05-30Modelling the large deformation of hyperelastic solids under plane stress conditions for arbitrary compressible and nearly incompressible material models is challenging. This is in contrast to the case of full incompressibility where the out-of-plane deformation can be entirely characterised by the in-plane components. A rigorous general procedure for the incorporation of the plane stress condition for the compressible case (including the nearly incompressible case) is provided here, accompanied by a robust and open source finite element code. An isochoric/volumetric decomposition is adopted for nearly incompressible materials yielding a robust single-field finite element formulation. The nonlinear equation for the out-of-plane component of the deformation gradient is solved using a Newton-Raphson procedure nested at the quadrature point level. The model's performance and accuracy are made clear via a series of simulations of benchmark problems. Additional challenging numerical examples of composites reinforced with particles and fibres further demonstrate the capability of this general computational framework.
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4. Stress distribution and deflection of symmetric tapered beams.
4. 对称锥形梁的应力分布与挠度PMID:日期:2025-02-12This paper discusses stress distributions and deflections of tapered beams. Assuming the elementary axial stress distribution and applying Jourawski theory, the shear stress is calculated. In an analogous manner, the transverse normal stress is computed. In contrast to prismatic beams, the shear and the transverse normal stress do not vanish over the surfaces if the beam height varies, even if surface tractions are not present. Their values also depend on the tapering angle and the axial stress at the boundary. Then analytical expressions for the deflections are computed by applying Castigliano's second theorem and considering a fictitious (dummy) force. The complementary strain energy is computed from the derived stress relations as a function of the real load and the dummy forces and moments. Taking the partial derivative with respect to the dummy force, the analytical results for the axial and vertical deflections are calculated. The outcome of the derived tapered beam model is compared to elementary results from Bernoulli-Euler and Timoshenko. The target solutions are obtained by two-dimensional finite element calculations for a tapered cantilever and a clamped-hinged beam subjected to various loads. It is shown that both the shear stress and also the transverse normal stress are correctly predicted by the new method and the deflections computed by Castigliano's theorem are in a very good agreement with numerical solutions. Errors are significantly reduced compared to the errors of the Timoshenko solution.
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5. Mechanical performance of negative-stiffness multistable bi-material composites.
5. 负刚度多稳态双材料复合材料的力学性能PMID:日期:2024-12-23Architected latticed structural systems, known as metamaterials or metastructures, have recently garnered significant attention due to their superior performance under various loading conditions. This class includes metamaterials exhibiting multistability, characterized by negative stiffness, which enables energy entrapment during transitions between equilibrium states, making them suitable for applications such as lightweight protective systems. In this study, in three folds, we investigate the mechanical performance of a negative stiffness honeycomb metamaterial (NSHM) with unit cells composed of curved double beams. First, the quasi-static compressive response is numerically examined using the finite element method, revealing that this response is independent of the number of cells. Next, we analyze the transient dynamic response of both mono-material NSHMs and bi-material composites, where the stiffeners are replaced by brittle polystyrene, under localized striker and uniform plate impacts. Finally, we present an analytical model for the total potential energy, with solutions obtained through an optimization technique, and validate these results against the numerical simulations. Through these analyses, we study the effects of several parameters influencing multistability. Our findings demonstrate that the bistability ratio significantly impacts the overall response of the honeycomb, and the desired negative stiffness can be achieved with high bistability ratios. Additionally, the contact force peaks resulting from striker impact are found to be independent of the number of constituent elements. The optimized geometry of the lattice is determined through a trade-off between porosity and stiffness, achieved by thicker cell walls.
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6. Pairwise interaction of in-line spheroids settling in a linearly stratified fluid.
6. 在线性分层流体中沉降的在线球体的成对相互作用PMID:日期:2024-11-04This study investigates the transport of particles in density-stratified fluids, a prevalent natural phenomenon. In the ocean, particles and marine snow descend through fluids with significant density variations due to salinity and temperature gradients. Such heterogeneity in the background fluid affects the settling or rising rates of particles, often leading to accumulation at transitional density layers. Previous research has primarily focused on spherical particles, examining their isolated motion, pairwise interactions, and collective transport in stratified fluids. This work, however, extends the investigation to the interaction between two spheroidal particles settling in-line in a linearly stratified fluid. This study employs an immersed-boundary technique to perform particle-resolved numerical simulations in a three-dimensional Cartesian domain. The results showcase the effects of varying the stratification strength through the Froude number, the particles' aspect ratios, and the initial separation distance between the particles on the interaction dynamics between the settling spheroids.
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7. An optimized differential evolution algorithm for constitutive model fitting of arteries.
7. 一种用于动脉本构模型拟合的优化差分进化算法PMID:日期:2024-04-18The mechanical properties of arteries are often assessed with biaxial testing. Constitutive models are fitted to the experimental stress-stretch responses to determine relations describing the intrinsic characteristics of the material. Nonlinear least square-based optimization routines and the Levenberg-Marquardt and Trust-Region-Reflective algorithms are commonly used for fitting. But they may not always produce the best fit for the experimental data. We describe a different optimized fitting routine that can significantly improve the constitutive model fit quality. Experimental stress-stretch data were obtained from biaxial testing of 16 human superficial femoral arteries. A metaheuristic population-based algorithm, Differential Evolution (DE), and loss functions based on the Minkowski and Chebyshev Distance functions were used to improve the fit with common constitutive relations. Hyperparameter tuning by grid search method was performed to determine how algorithm settings affect the fit quality. The DE algorithm showed a superior fit in all samples compared to the traditional algorithms. The loss functions based on Minkowski Distance and Chebyshev relations rather than the square error produced better fits. This allows describing the experimental data with simpler constitutive relations that have fewer material parameters, which reduces the complexity and improves the efficiency of computational implementations.
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8. Shape control of moderately thick piezoelectric beams.
8. 中等厚度压电梁的形状控制PMID:日期:2023-03-31The present contribution focuses on shape control of thick beam-type structures. First the governing equations of a multi-layered beam are derived by taking advantage of the Timoshenko assumptions and the constitutive relations of piezoelectric materials. The deflection curves are explicitly given for a piezoelectric cantilever subjected to a polynomial distribution of the vertical load and the applied electric voltage. In order to find a solution for the optimal shape control voltage an objective function, which depends on the quadratic deflection curve over the beam length, is minimized. Finally several benchmark examples are given for thick beams and the outcome is compared to finite element results and previously derived shape control results from the scientific literature that hold for thin piezoelectric beams. The presented shape control method shows a better agreement with the numerical outcome than the analytical shape control results within the Bernoulli-Euler theory, but the desired voltage distribution only slightly differs from the outcome for thin beams. Furthermore it is found that for a given total thickness-to-length ratio piezoelectric bimorph structures may be more difficult to be perfectly controlled than three-layer beams with thin piezoelectric layers. This is due to higher order piezoelectric effects which are not considered by the present theory (e.g. the thickness deformation caused by the thickness piezoelectric coupling constant).
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9. A verified analytical sandwich beam model for soft and hard cores: comparison to existing analytical models and finite element calculations.
PMID:日期:2023-02-22This paper presents a novel approach of modeling of three-layer beam. Such composites are usually known as sandwich structures if the modulus of elasticity of the core is much smaller than those of the faces. In the present approach, the faces are modeled as Bernoulli-Euler beams, the core as a Timoshenko beam. Taking into account the kinematic and dynamic interface conditions, which means that the perfect bonding assumptions hold for the displacement and each layer is subjected to continuous traction stresses across the interface, a sixth-order differential equation is derived for the bending deflection, and a second-order system for the axial displacement. No restrictions are imposed on the elastic properties of the middle layer, and hence the developed theory also yields accurate results for hard cores. The presented refined theory is compared to analytical models from the literature and to finite element calculations for various benchmark examples. Special focus is laid the boundary conditions and the core stiffness. A parametric study varying the Young modulus of the core shows that the present sandwich model agrees very well with the target solutions obtained from finite element calculations under plane stress assumptions, in particular concerning the transverse deflection, the shear stress distribution and the interfacial normal stress.
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10. The Kelvin-Voigt visco-elastic model involving a fractional-order time derivative for modelling torsional oscillations of a complex discrete biodynamical system.
10. 涉及分数阶时间导数的Kelvin-Voigt粘弹性模型用于模拟复杂离散生物动力学系统的扭转振荡PMID:日期:2023-01-18Under external loads trees exhibit complex oscillatory behaviour: their canopies twist and band. The great complexity of this oscillatory behaviour consists to an important degree of torsional oscillations. Using a system of ordinary differential fractional-order equations, free and forced main eigen-modes of fractional-type torsional oscillations of a hybrid discrete biodynamical system of complex structures were done. The biodynamical system considered here corresponds to a tree trunk with branches and is in the form of a visco-elastic cantilever of complex structure. Visco-elasticity corresponds to different ages of a tree. We set up a new model of torsional oscillations of a complex discrete, biodynamical system, using the Kelvin-Voigt visco-elastic model involving a fractional-order time derivative. The analytical expressions describing the characteristic properties of its fractional-type oscillations are determined. Based on mathematical and qualitative analogies, this concept represents a new model of torsional oscillations of a light cantilever that takes into account visco-elastic, dissipative properties of the material. Rigid discs are attached to the cantilever. Expressions for kinetic energy, deformation work and a generalized function of the fractional-type energy dissipation of this biodynamical system are defined. Independent main eigen-modes of the fractional type for free and forced torsional oscillations were determined for a special class of such systems, using formulas for the transformation of independent generalized angle coordinates to the principal main eigen-coordinates of the system. The forms of their approximate analytical solutions are shown. In the general case for inhomogeneous biodynamical systems of fractional type, there are no independent main fractional-type eigen-modes of torsional oscillations. The system behaves as a nonlinear system. A new constitutive relation between coupling of torsion loading to a visco-elastic fractional-type cantilever with fractional-type dissipation of cantilever mechanical energy and angle of torsion deformation is determined using a fractional-order derivative. The main advantages of the proposed model are the possibility to analyse torsional oscillations of more complex structures and the possibility to analyse complex cantilevers with different cross-sectional diameters.