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Transfer matrix for a weakly nonlocal elastic layer and Lamb waves in layered nonlocal composite plates 弱非局部弹性层的传递矩阵和层状非局部复合板中的 Lamb 波
IF 2.6 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-26 DOI: 10.1177/10812865241258377
Vu Thi Ngoc Anh, Pham Chi Vinh, Tran Thanh Tuan
In this paper, we establish the transfer matrix for an orthotropic elastic layer made of nanomaterial that is modeled by the weakly nonlocal elasticity model. This model is proposed recently and different from other existing nonlocal models of elasticity it has been proved to be well-posed for any problem of plane waves. Since the established transfer matrix is totally explicit, it is a convenient tool in investigating various problems of plane waves propagating in layered nonlocal elastic media. To prove this point, we use it to derive the dispersion equation of Lamb waves propagating in a composite plate consisting of two weakly nonlocal orthotropic layers. The dispersion equation in explicit form of Lamb waves has been derived, and it is shown that the derivation of this equation is much more simple than the one using the traditional technique. The obtained explicit dispersion equation will be used to establish techniques monitoring the health of layered nanostructures.
本文建立了纳米材料正交弹性层的传递矩阵,该层由弱非局部弹性模型建模。该模型是最近提出的,与其他现有的非局部弹性模型不同,它已被证明可以很好地解决任何平面波问题。由于所建立的传递矩阵是完全显式的,因此它是研究平面波在层状非局部弹性介质中传播的各种问题的便捷工具。为了证明这一点,我们用它推导了在由两个弱非局部正交层组成的复合板中传播的 Lamb 波的频散方程。我们推导出了 Lamb 波的显式频散方程,并证明该方程的推导比使用传统技术简单得多。得到的显式频散方程将用于建立监测层状纳米结构健康状况的技术。
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引用次数: 0
An internal variable model of macroscopic twin boundary dynamics 宏观孪生边界动力学的内变量模型
IF 2.6 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-26 DOI: 10.1177/10812865241258723
Arkadi Berezovski
Depending on whether the experiments are quasi-static or fast dynamics, the measured twin boundary velocity values range from zero to the material’s sound speed. The twin boundary velocity is not yet predicted theoretically in the continuum mechanics framework. The extension of continual description is provided in the paper by means of internal variables. It is shown that a diffusional slow motion of twin boundaries can be represented using a single internal variable. The dual internal variable technique is employed for the description of the fast dynamics of twin boundaries.
根据实验是准静态实验还是快速动力学实验,测得的孪生边界速度值从零到材料的声速不等。在连续介质力学框架中,孪晶边界速度尚未得到理论预测。本文通过内部变量对连续描述进行了扩展。研究表明,孪生边界的扩散慢速运动可以用一个内部变量来表示。双内部变量技术被用于描述孪生边界的快速动力学。
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引用次数: 0
Non-coercive problems for elastic plates with thin junction 薄交界弹性板的非强制问题
IF 2.6 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-26 DOI: 10.1177/10812865241252375
Alexander M Khludnev
We consider a non-coercive boundary value problem for two elastic Kirchhoff–Love plates connected to each other by a thin junction. The non-coercivity of the problem is due to the Neumann-type conditions imposed at the external boundaries of the plates. A solution existence is proved for suitable given external forces. Passages to limits are justified as a rigidity parameter of the junction tends to infinity and to zero. We prove that the model corresponding to the first limit case describes an equilibrium of elastic plates with a thin rigid junction; the second limit model fits to the equilibrium state of two elastic plates independent of each other.
我们考虑了两个通过薄交界处相互连接的弹性基尔霍夫-洛夫板的非矫顽力边界值问题。问题的非矫顽力是由于在板的外部边界施加了 Neumann 型条件。对于合适的给定外力,证明了解的存在性。当交界处的刚度参数趋于无穷大或趋于零时,证明了进入极限的合理性。我们证明,与第一种极限情况相对应的模型描述了具有薄刚性交界处的弹性板的平衡状态;第二种极限模型适合于两个相互独立的弹性板的平衡状态。
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引用次数: 0
Stability analysis of thin cylindrical shells under pure and three-point bending 薄圆柱壳在纯弯曲和三点弯曲下的稳定性分析
IF 2.6 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-26 DOI: 10.1177/10812865241259134
Péter Máté, András Szekrényes
Cylindrical shells curved in only one direction show an interesting behaviour when bent, especially if they remain completely in the elastic region and do not undergo plastic forming. This can be observed in their most common application: the measuring tape. They can be coiled easily because of the loss of stability of their cross-sections, which makes transportation of long shells efficient. This property could be very useful if one could use such a one-way curved shell as a beam, which could be transported and deployed easily. The aim of this study is to observe the behaviour of such a shell, under pure bending load, with special emphasis on the stability loss of the cross-section. In this paper, analytical, semi-analytical, and finite-element methods are used for the description of the shell. The solution derived here uses a variable cross-section Euler–Bernoulli beam model combined with elements of the Kirchhoff plate theory without the shallow shell assumption. It is assumed that the cross-section remains circular and does not change its length. For a universal description, dimensionless parameters and variables are introduced. The semi-analytical investigation revealed that the snap-through ability of the shell may not exist for certain cross-sections which can be presented on a stability map. The derived model reveals the existence of a limiting point between the cross-section deformation modes for larger cross-section angles. In the article, ready-to-use analytical and semi-analytical solutions are given for the critical load and stability map of these shells, which are compared to similar shallow shell models from the literature and the finite-element solution of the problem. The finite-element method also revealed that for a dimensionless description, a length-cross-section radius parameter should be introduced to describe the three-point bending scenario.
只有一个方向弯曲的圆柱形壳体在弯曲时会表现出有趣的行为,尤其是当它们完全保持在弹性区域而不发生塑性变形时。最常见的应用就是卷尺。由于其横截面失去了稳定性,因此可以很容易地将其卷绕起来,从而使长壳的运输变得高效。如果能将这种单向弯曲的壳体用作横梁,这种特性将非常有用,因为横梁可以很容易地运输和部署。本研究的目的是观察这种壳体在纯弯曲载荷下的行为,重点是横截面的稳定性损失。本文采用分析、半分析和有限元方法来描述壳体。本文得出的解决方案采用了变截面欧拉-伯努利梁模型,并结合了基尔霍夫板理论的元素,但没有浅壳假设。假设横截面保持圆形,长度不变。为了进行通用描述,引入了无量纲参数和变量。半分析研究表明,在某些横截面上可能不存在壳的快速通过能力,这可以用稳定图来表示。推导出的模型揭示了在横截面角度较大时,横截面变形模式之间存在一个极限点。文章给出了这些壳体临界载荷和稳定性图的现成分析和半分析解,并将其与文献中的类似浅壳模型和问题的有限元解进行了比较。有限元方法还显示,对于无量纲描述,应引入长度-横截面半径参数来描述三点弯曲情况。
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引用次数: 0
Predicting and explaining nonlinear material response using deep physically guided neural networks with internal variables 利用带内部变量的深度物理引导神经网络预测和解释非线性材料响应
IF 2.6 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-26 DOI: 10.1177/10812865241257850
Jacobo Ayensa-Jiménez, Javier Orera-Echeverría, Manuel Doblare
Nonlinear materials are often difficult to model with classical state model theory because they have a complex and sometimes inaccurate physical and mathematical description, or we simply do not know how to describe such materials in terms of relations between external and internal variables. In many disciplines, neural network methods have emerged as powerful tools to identify very complex and nonlinear correlations. In this work, we use the very recently developed concept of physically guided neural networks with internal variables (PGNNIVs) to discover constitutive laws using a model-free approach and training solely with measured force–displacement data. PGNNIVs make a particular use of the physics of the problem to enforce constraints on specific hidden layers and are able to make predictions without internal variable data. We demonstrate that PGNNIVs are capable of predicting both internal and external variables under unseen loading scenarios, regardless of the nature of the material considered (linear, with hardening or softening behavior and hyperelastic), unravelling the constitutive law of the material hence explaining its nature altogether, endowing the method with some explanatory character that distances it from the traditional black box approach.
非线性材料通常难以用经典状态模型理论来建模,因为它们的物理和数学描述非常复杂,有时甚至不准确,或者我们根本不知道如何用外部变量和内部变量之间的关系来描述这类材料。在许多学科中,神经网络方法已成为识别非常复杂和非线性相关性的强大工具。在这项工作中,我们利用最近开发的具有内部变量的物理引导神经网络(PGNNIVs)概念,采用无模型方法,仅使用测得的力-位移数据进行训练,从而发现构成规律。PGNNIVs 特别利用问题的物理特性,对特定的隐藏层实施约束,并能在没有内部变量数据的情况下进行预测。我们证明了 PGNNIVs 能够预测未见加载情况下的内部和外部变量,无论考虑的材料性质如何(线性、硬化或软化行为以及超弹性),从而揭示材料的构成规律,进而完全解释其性质,赋予该方法一定的解释性,使其有别于传统的黑箱方法。
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引用次数: 0
In recognition of the 80th birthday of Ray Ogden 纪念雷-奥格登 80 岁生日
IF 2.6 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-25 DOI: 10.1177/10812865241257268
Luis Dorfmann, José Merodio, Raimondo Penta, Prashant Saxena
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引用次数: 0
A partially debonded rigid elliptical inclusion with a liquid slit inclusion occupying the debonded portion 部分脱粘的刚性椭圆形包合物,脱粘部分含有液体狭缝包合物
IF 2.6 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-06-22 DOI: 10.1177/10812865241257534
Xu Wang, Peter Schiavone
We derive a closed-form solution to the plane strain problem of a partially debonded rigid elliptical inclusion in which the debonded portion is filled with a liquid slit inclusion when the infinite isotropic elastic matrix is subjected to uniform remote in-plane stresses. The original boundary value problem is reduced to a Riemann–Hilbert problem with discontinuous coefficients, and its analytical solution is derived. By imposing the incompressibility condition of the liquid slit inclusion and balance of moment on a circular disk of infinite radius, we obtain a set of two coupled linear algebraic equations for the two unknowns characterizing the internal uniform hydrostatic tension within the liquid slit inclusion and the rigid body rotation of the rigid elliptical inclusion. As a result, these two unknowns can be uniquely determined revealing the elastic field in the matrix.
当无限各向同性弹性矩阵受到均匀远程面内应力作用时,我们推导出了部分脱粘刚性椭圆夹杂物平面应变问题的闭式解,其中脱粘部分由液体狭缝夹杂物填充。原始边界值问题被简化为系数不连续的黎曼-希尔伯特问题,并得出了其解析解。通过施加液体狭缝包容体的不可压缩性条件和无限半径圆盘上的力矩平衡,我们得到了两个耦合线性代数方程组,这两个未知数分别表征液体狭缝包容体内部的均匀静水张力和刚性椭圆包容体的刚体旋转。因此,这两个未知数可以唯一确定,揭示出矩阵中的弹性场。
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引用次数: 0
Critical velocities of a three-layer composite tube incorporating the rotary inertia and material anisotropy 包含旋转惯性和材料各向异性的三层复合管的临界速度
IF 2.6 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-06-21 DOI: 10.1177/10812865241250015
Xin-Lin Gao
Critical velocities of a three-layer composite tube subjected to a uniform internal pressure moving at a constant velocity are obtained in closed-form expressions. A Love–Kirchhoff thin shell model including the rotary inertia and material anisotropy effects is used in the formulation. The composite tube is made of three perfectly bonded cylindrical layers of dissimilar materials, each of which can be orthotropic, transversely isotropic, cubic or isotropic. Closed-form formulas for the critical velocities are first derived for the general case by incorporating the effects of material anisotropy, rotary inertia and radial stress. Specific formulas are then obtained for composite tubes without the rotary inertia effect and/or the radial stress effect and with various types of material symmetry for each layer as special cases. It is also shown that the current model for three-layer tubes can be reduced to those for single- and two-layer tubes. To illustrate the newly derived formulas, an example is provided for a composite tube consisting of an isotropic inner layer, an orthotropic core, and an isotropic outer layer. All four critical velocities of the composite tube are computed using the new closed-form formulas. Three values of the lowest critical velocity of the three-layer composite tube are analytically obtained from three sets of the new formulas, which agree well with the value computationally determined by others.
通过闭式表达式获得了三层复合管在均匀内压作用下匀速运动的临界速度。计算中使用了 Love-Kirchhoff 薄壳模型,其中包括旋转惯性和材料各向异性效应。复合管由三层完全粘合的异种材料圆柱层组成,每层材料可以是正交各向同性材料、横向各向同性材料、立方体材料或各向同性材料。通过将材料各向异性、旋转惯性和径向应力的影响考虑在内,首先得出了一般情况下临界速度的闭式公式。然后,针对没有旋转惯性效应和/或径向应力效应的复合管,以及作为特例的各层材料对称的各种类型,得出了具体公式。计算结果还表明,目前的三层管模型可以简化为单层和双层管模型。为了说明新推导出的公式,以由各向同性内层、正交核心和各向同性外层组成的复合管为例进行说明。使用新的闭式公式计算了复合管的所有四个临界速度。从三组新公式中分析得出了三层复合管的三个最低临界速度值,这些值与其他人通过计算确定的值非常吻合。
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引用次数: 0
Some qualitative results in hyperbolic two-temperature generalized thermoelasticity 双曲双温广义热弹性中的一些定性结果
IF 2.6 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-06-02 DOI: 10.1177/10812865241253208
Rashmi Prasad, Roushan Kumar
This study aims to establish the convolutional-type variational and reciprocity theorems within the framework of the hyperbolic two-temperature generalized thermoelasticity theory for an isotropic thermoelastic material, with the help of alternate formulation of the mixed boundary initial value problem, in which initial conditions are combined with field equations (using the Laplace transform). The convolutional-type variational principle adapts readily to numerical solutions based on the Ritz method and is useful in the finite element method. The reciprocity theorem is helpful in the theoretical development of boundary and finite element methods. The current effort can be valuable for the problem of coupling effects of thermal and mechanical fields, especially in geophysics and mining.
本研究旨在各向同性热弹性材料的双曲双温广义热弹性理论框架内,借助混合边界初值问题的交替表述,建立卷积型变分和互易定理,其中初始条件与场方程相结合(使用拉普拉斯变换)。卷积型变分原理很容易适应基于里兹法的数值求解,在有限元法中也很有用。互易定理有助于边界和有限元方法的理论发展。目前的努力对于热场和机械场的耦合效应问题很有价值,特别是在地球物理学和采矿方面。
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引用次数: 0
Topology optimization of continuous fiber-reinforced composites using Shepard interpolation and its design variable reduction 利用谢泼德插值及其设计变量减少法优化连续纤维增强复合材料的拓扑结构
IF 2.6 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-06-01 DOI: 10.1177/10812865241253520
Xinze Guo, Kemin Zhou
In the design optimization of fiber-reinforced composites, spatial material discontinuity is considered intractable within the manufacturing reality imposed by advanced technologies. This paper presents a topological optimization framework based on truss-like material to design composite structures with continuous fiber. Specifically, the fiber morphology at the scattered design points, which controls the orientation and volume fraction, is taken as design variables. Using the Shepard interpolant scheme, the fiber morphology at any given computational point is interpolated by scattered design variables within a certain circular influence domain. The employed interpolation inherently ensures the spatial continuity and range-restricted of the physical field in an element-independent manner. Since separating the design variable field and analysis mesh on two independent sets of points, this method is well suited for using a sparse design variable field. The computational savings are compelling due to the reduced number of design variables without significantly restricting the design freedom. Numerical instability such as checkerboard and mesh dependencies vanished as no intermediate densities are suppressed in optimization. The continuous fiber-reinforced composites (CFRCs) in the form of truss-like continua are ready to be manufactured with the aid of a simple post-processing. Several numerical examples are investigated to demonstrate the feasibility and effectiveness of the proposed formulation and numerical techniques.
在纤维增强复合材料的优化设计中,空间材料的不连续性被认为是先进技术带来的制造现实中难以解决的问题。本文提出了一种基于类桁架材料的拓扑优化框架,用于设计具有连续纤维的复合材料结构。具体来说,将控制取向和体积分数的分散设计点的纤维形态作为设计变量。利用 Shepard 插值方案,在一定的圆形影响域内,通过散射设计变量对任意给定计算点的纤维形态进行插值。所采用的插值方法从本质上确保了物理场的空间连续性和范围限制,且与元素无关。由于在两组独立的点上分离了设计变量场和分析网格,这种方法非常适合使用稀疏设计变量场。由于减少了设计变量的数量,在不明显限制设计自由度的情况下节省了大量的计算量。由于在优化过程中没有抑制中间密度,因此诸如棋盘格和网格依赖性等数值不稳定性消失了。只需进行简单的后处理,即可制造出桁架状连续纤维增强复合材料(CFRC)。通过对几个数值实例的研究,证明了所提出的配方和数值技术的可行性和有效性。
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引用次数: 0
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Mathematics and Mechanics of Solids
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