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A chaotic study of love dynamics with competition using fractal-fractional operator 利用分形-分数算子对有竞争的爱情动态进行混沌研究
IF 1.6 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-08-20 DOI: 10.1108/ec-02-2024-0151
Anil Kumar, Pawan Kumar Shaw, Sunil Kumar

Purpose

The objective of this work is to analyze the necessary conditions for chaotic behavior with fractional order and fractal dimension values of the fractal-fractional operator.

Design/methodology/approach

The numerical technique based on the fractal-fractional derivative is implemented over the fractional model and analyzes the condition at the distinct values of fractional order and fractal dimension.

Findings

The obtained numerical solution from the numerical technique is analyzed at distinct fractional order and fractal dimension values, and it has been figured out that the behavior of the solution either chaotic or non-chaotic agrees with the condition.

Originality/value

The necessary condition is associated with the fractional order only. So, our work not only studies the condition with fractional order but also examines the model by simultaneously adjusting fractal dimension values. It is found that the model still has chaotic or non-chaotic behavior at certain fractal dimension values and fractional order values corresponding to the condition.

设计/方法/途径在分形模型上实施基于分形-分形导数的数值技术,并分析不同分形阶数和分形维数值下的条件。研究结果分析了数值技术在不同分数阶数和分形维度值下获得的数值解,结果表明该解的混沌或非混沌行为均符合条件。因此,我们的工作不仅研究了分形阶的条件,还通过同时调整分形维度值对模型进行了检验。结果发现,在某些分形维值和分形阶值与条件相对应时,模型仍具有混沌或非混沌行为。
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引用次数: 0
Enhancing structural analysis efficiency: a comprehensive review and experimental validation of advanced submodeling techniques, introducing the submodeling-density-shape-element removal (S-D-S-ER) method 提高结构分析效率:先进子建模技术的全面回顾与实验验证,介绍子建模-密度-形状-元素去除(S-D-S-ER)方法
IF 1.6 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-08-19 DOI: 10.1108/ec-03-2024-0188
Ibrahim T. Teke, Ahmet H. Ertas
<h3>Purpose</h3><p>The paper's goal is to examine and illustrate the useful uses of submodeling in finite element modeling for topology optimization and stress analysis. The goal of the study is to demonstrate how submodeling – more especially, a 1D approach – can reliably and effectively produce ideal solutions for challenging structural issues. The paper aims to demonstrate the usefulness of submodeling in obtaining converged solutions for stress analysis and optimized geometry for improved fatigue life by studying a cantilever beam case and using beam formulations. In order to guarantee the precision and dependability of the optimization process, the developed approach will also be validated through experimental testing, such as 3-point bending tests and 3D printing. Using 3D finite element models, the 1D submodeling approach is further validated in the final step, showing a strong correlation with experimental data for deflection calculations.</p><!--/ Abstract__block --><h3>Design/methodology/approach</h3><p>The authors conducted a literature review to understand the existing research on submodeling and its practical applications in finite element modeling. They selected a cantilever beam case as a test subject to demonstrate stress analysis and topology optimization through submodeling. They developed a 1D submodeling approach to streamline the optimization process and ensure result validity. The authors utilized beam formulations to optimize and validate the outcomes of the submodeling approach. They 3D-printed the optimized models and subjected them to a 3-point bending test to confirm the accuracy of the developed approach. They employed 3D finite element models for submodeling to validate the 1D approach, focusing on specific finite elements for deflection calculations and analyzed the results to demonstrate a strong correlation between the theoretical models and experimental data, showcasing the effectiveness of the submodeling methodology in achieving optimal solutions efficiently and accurately.</p><!--/ Abstract__block --><h3>Findings</h3><p>The findings of the paper are as follows: 1. The use of submodeling, specifically a 1D submodeling approach, proved to be effective in achieving optimal solutions more efficiently and accurately in finite element modeling. 2. The study conducted on a cantilever beam case demonstrated successful stress analysis and topology optimization through submodeling, resulting in optimized geometry for enhanced fatigue life. 3. Beam formulations were utilized to optimize and validate the outcomes of the submodeling approach, leading to the successful 3D printing and testing of the optimized models through a 3-point bending test. 4. Experimental results confirmed the accuracy and validity of the developed submodeling approach in streamlining the optimization process. 5. The use of 3D finite element models for submodeling further validated the 1D approach, with specific finite elements showing a strong
目的 本文旨在研究和说明在拓扑优化和应力分析的有限元建模中如何有效利用子建模。研究的目的是证明子建模--尤其是一维方法--如何可靠有效地为具有挑战性的结构问题提供理想的解决方案。本文旨在通过研究悬臂梁案例和使用梁公式,证明子建模在获得应力分析收敛解和优化几何形状以提高疲劳寿命方面的实用性。为了保证优化过程的精确性和可靠性,还将通过实验测试(如三点弯曲测试和三维打印)对所开发的方法进行验证。利用三维有限元模型,一维子建模方法在最后一步得到进一步验证,显示出与挠度计算实验数据的紧密相关性。他们选择了一个悬臂梁案例作为试验对象,通过子建模演示应力分析和拓扑优化。他们开发了一种一维子建模方法,以简化优化过程并确保结果的有效性。作者利用梁配方来优化和验证子建模方法的结果。他们对优化后的模型进行了三维打印,并对其进行了三点弯曲测试,以确认所开发方法的准确性。他们采用三维有限元模型进行子建模,以验证一维方法,重点关注用于挠度计算的特定有限元,并对结果进行了分析,证明理论模型与实验数据之间具有很强的相关性,展示了子建模方法在高效、准确地实现最优解方面的有效性:1.事实证明,在有限元建模中使用子建模,特别是一维子建模方法,可以更高效、更准确地获得最优解。2.对悬臂梁的研究表明,通过子建模成功地进行了应力分析和拓扑优化,从而优化了几何形状,提高了疲劳寿命。3.3. 利用梁公式优化和验证了子建模方法的结果,从而成功地进行了三维打印,并通过三点弯曲测试对优化后的模型进行了测试。4.实验结果证实了所开发的子建模方法在简化优化过程中的准确性和有效性。5.使用三维有限元模型进行子建模进一步验证了一维方法,在挠度计算中,特定的有限元与实验数据显示出很强的相关性。总之,研究结果凸显了子建模技术在有限元建模、应力分析和优化过程中实现最优解和验证结果的有效性。 原创性/价值 本文的原创性和价值在于其在有限元建模中利用子建模技术进行结构分析和优化的创新方法。通过将重点放在减少有限元模型和通过子建模创建更小、更易于管理的模型上,论文为设计人员提供了一种更高效、更准确的方法,以实现复杂问题的最优解决方案。研究使用悬臂梁案例来演示应力分析和拓扑优化,展示了子建模在现实世界中的实际应用。一维子建模方法的开发,以及利用梁配方和三维打印进行实验验证,为研究增添了新的维度。此外,论文还整合了一维和三维子建模技术,用于挠度计算和验证,突出了研究的全面性和严谨性。有限元模型与实验数据之间的强相关性强调了所开发方法的可靠性和准确性。总之,本文的原创性和价值在于其对子建模技术的全面探索、在结构分析和优化中的实际应用以及通过实验测试的成功验证。
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引用次数: 0
Retrieving the time-dependent blood perfusion coefficient in the thermal-wave model of bio-heat transfer 在生物传热的热波模型中检索随时间变化的血液灌注系数
IF 1.6 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-08-16 DOI: 10.1108/ec-01-2024-0013
M. Alosaimi, D. Lesnic

Purpose

In order to include the non-negligible lag relaxation time feature that is characteristic of heat transfer in biological bodies, the classical Fourier's law of heat conduction has to be generalized as the Maxwell–Cattaneo law resulting in the thermal-wave model of bio-heat transfer. The purpose of the paper is to retrieve the unknown time-dependent blood perfusion coefficient in such a thermal-wave model of bio-heat transfer from (non-intrusive) measurements of the temperature on an accessible sub-portion of the boundary that may be taken with an infrared scanner.

Design/methodology/approach

The nonlinear and ill-posed problem is reformulated as a nonlinear minimization problem of a Tikhonov regularization functional subject to lower and upper simple bounds on the unknown coefficient. For the numerical discretization, an unconditionally stable direct solver based on the Crank–Nicolson finite-difference scheme is developed. The Tikhonov regularization functional is minimized iteratively by the built-in routine lsqnonlin from the MATLAB optimization toolbox. Numerical results for a benchmark test example are presented and thoroughly discussed, shedding light on the performance and effectiveness of the proposed methodology.

Findings

The inverse problem of obtaining the time-dependent blood perfusion coefficient and the temperature in the thermal-wave model of bio-heat transfer from extra boundary temperature measurement has been solved. In particular, the uniqueness of the solution to this inverse problem has been established. Furthermore, our proposed computational method demonstrated successful attainment of the perfusion coefficient and temperature, even when dealing with noisy data.

Originality/value

The originalities of the present paper are to account for such a more representative thermal-wave model of heat transfer in biological bodies and to investigate the possibility of determining its time-dependent blood perfusion coefficient from non-intrusive boundary temperature measurements.

目的 为了包括生物体内热传导所特有的不可忽略的滞后弛豫时间特征,必须将经典的傅里叶热传导定律概括为麦克斯韦-卡塔尼奥定律,从而形成生物热传导的热波模型。本文的目的是通过红外扫描仪(非侵入式)测量可接近的边界子部分的温度,在这种生物热传导的热波模型中检索未知的随时间变化的血液灌注系数。设计/方法/途径将非线性问题重新表述为 Tikhonov 正则化函数的非线性最小化问题,该函数受制于未知系数的简单下限和上限。在数值离散化方面,开发了基于 Crank-Nicolson 有限差分方案的无条件稳定直接求解器。Tikhonov 正则化函数通过 MATLAB 优化工具箱中的内置例程 lsqnonlin 进行迭代最小化。研究结果解决了从额外的边界温度测量中获取随时间变化的血液灌注系数和生物传热热波模型中温度的逆问题。特别是,该逆问题解的唯一性已经确定。此外,我们提出的计算方法表明,即使在处理噪声数据时,也能成功获得血液灌流系数和温度。 原创性/价值本文的原创性在于解释了生物体中热传导的这种更具代表性的热波模型,并研究了从非侵入式边界温度测量中确定随时间变化的血液灌流系数的可能性。
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引用次数: 0
Dynamic propagation of tensile and shear fractures induced by impact load in rock based on the dual bilinear cohesive zone model 基于双双线性粘聚区模型的冲击载荷诱发岩石拉伸和剪切裂缝的动态扩展
IF 1.6 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-08-14 DOI: 10.1108/ec-09-2023-0599
Yongliang Wang, Yongcai Zhao, Xin Zhang

Purpose

The purpose of this study is to simulate the tensile and shear types of fractures using the mixed fracture criteria considering the energy evolution based on the dual bilinear cohesive zone model and investigate the dynamic propagation of tensile and shear fractures induced by an impact load in rock. The propagation of tension and shear at different scales induced by the impact load is also an important aspect of this study.

Design/methodology/approach

In this study, based on the well-developed dual bilinear cohesive zone model and combined finite element-discrete element method, the dynamic propagation of tensile and shear fractures induced by the impact load in rock is investigated. Some key technologies, such as the governing partial differential equations, fracture criteria, numerical discretisation and detection and separation, are introduced to form the global algorithm and procedure. By comparing with the tensile and shear fractures induced by the impact load in rock disc in typical experiments, the effectiveness and reliability of the proposed method are well verified.

Findings

The dynamic propagation of tensile and shear fractures in the laboratory- and engineering-scale rock disc and rock strata are derived. The influence of mesh sensitivity, impact load velocities and load positions are investigated. The larger load velocities may induce larger fracture width and entire failure. When the impact load is applied near the left support constraint boundary, concentrated shear fractures appear around the loading region, as well as induced shear fracture band, which may induce local instability. The proposed method shows good applicability in studying the propagation of tensile and shear fractures under impact loads.

Originality/value

The proposed method can identify fracture propagation via the stress and energy evolution of rock masses under the impact load, which has potential to be extended into the investigation of the mixed fractures and disturbance of in-situ stresses during dynamic strata mining in deep energy development.

目的本研究的目的是基于双双线性粘聚区模型,使用考虑能量演化的混合断裂标准模拟拉伸和剪切类型的断裂,并研究冲击荷载在岩石中诱发的拉伸和剪切断裂的动态传播。设计/方法/途径在本研究中,基于成熟的双双线性粘聚区模型和有限元-离散元组合方法,研究了冲击载荷在岩石中诱导的拉伸和剪切裂缝的动态传播。引入了一些关键技术,如控制偏微分方程、断裂准则、数值离散化和检测与分离,形成了全局算法和程序。通过与典型实验中冲击载荷在岩石圆盘中诱发的拉伸和剪切断裂进行对比,很好地验证了所提方法的有效性和可靠性。研究结果推导了拉伸和剪切断裂在实验室和工程规模的岩石圆盘和岩层中的动态传播。研究了网格灵敏度、冲击载荷速度和载荷位置的影响。较大的荷载速度可能会导致更大的断裂宽度和整体破坏。当冲击载荷施加在左侧支撑约束边界附近时,加载区域周围会出现集中剪切断裂以及诱导剪切断裂带,这可能会引起局部失稳。该方法可通过岩体在冲击载荷作用下的应力和能量演化来识别断裂扩展,有望推广到深部能源开发中地层动态开采过程中混合断裂和原位应力扰动的研究中。
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引用次数: 0
Multi-objective parameter matching of elastic ring for rotor system by using particle swarm optimization method 利用粒子群优化法实现转子系统弹性环的多目标参数匹配
IF 1.6 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-08-07 DOI: 10.1108/ec-08-2023-0487
Kai Sun, Zhong Luo, Lei Li, Fayong Wu, Xuanrui Wu

Purpose

Elastic rings served as the elastic supporting elements which have been extensively used in the aeroengines for maneuverable planes with high overloading. However, under extreme conditions, the elastic ring contacts the bearing seat, causing elastic ring failure. Therefore, it is necessary to optimize the matching parameters of the elastic ring in order to suppress the occurrence of elastic ring failure under harsh working conditions.

Design/methodology/approach

In this paper, a rotor system supported by elastic rings is researched and a multi-objective parameter matching method of elastic ring is proposed, considering the elastic ring failure, rotor system’s frequency forbidden zone and rotor system’s dynamic response. Then, the particle swarm optimization algorithm is used to dynamically constrain the parameter matching space and obtain the ideal solution for the elastic ring parameter matching.

Findings

By analyzing the elastic ring’s matching results (different unbalanced forces and disk masses), the relationship between the trend of Pareto front changes and rotor system parameters is studied. In addition, the rotor system’s dynamic characteristics before and after parameter matching are analyzed.

Originality/value

This article provides guidance for the design of elastic rings by matching the parameters of elastic rings.

目的 弹性环是一种弹性支撑元件,被广泛应用于航空发动机中的高过载机动飞机。然而,在极端条件下,弹性环会接触到轴承座,导致弹性环失效。本文以弹性环支撑的转子系统为研究对象,综合考虑弹性环失效、转子系统频率禁区和转子系统动态响应等因素,提出了弹性环的多目标参数匹配方法。研究结果 通过分析弹性环的匹配结果(不同的不平衡力和盘质量),研究了帕累托前沿变化趋势与转子系统参数之间的关系。此外,还分析了参数匹配前后转子系统的动态特性。
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引用次数: 0
A lightweight interactive approach for unstructured surface mesh generation 非结构化曲面网格生成的轻量级交互式方法
IF 1.6 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-08-02 DOI: 10.1108/ec-03-2023-0103
Yang Liu, Yuefan Hu, Dongxiang Xie, Yongjie Zhang, Jianqiang Chen

Purpose

The paper aims to propose a generation approach for unstructured surface mesh to speed up mesh generation.

Design/methodology/approach

The paper proposes a lightweight interactive generation approach for unstructured surface mesh and presents several key technologies to support this approach.

Findings

The experimental results show that the proposed approach is feasible for unstructured meshes and it can accelerate the mesh generation process.

Research limitations/implications

More geometric defects should be covered, and more convenient and efficient interactive means need to be provided.

Practical implications

The proposed approach and key technologies are implemented in NNW-GridStar.UG, which is the unstructured version of the mesh generation software of National Numerical Windtunnel (NNW).

Originality/value

This paper proposes a lightweight interactive approach for unstructured surface mesh generation, which can speed up mesh generation.

设计/方法/途径本文提出了一种非结构化曲面网格的轻量级交互式生成方法,并介绍了支持该方法的几项关键技术。实验结果实验结果表明,本文提出的方法对于非结构化网格是可行的,并且可以加速网格生成过程。研究的局限性/意义需要涵盖更多的几何缺陷,并提供更方便、更高效的交互手段。本文提出的方法和关键技术已在 NNW-GridStar.UG 中实现,NNW-GridStar.UG 是国家数值风洞(NNW)非结构化版本的网格生成软件。
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引用次数: 0
Addressing performance improvement of a neural network model for Reynolds-averaged Navier–Stokes solutions with high wake formation 解决雷诺平均纳维-斯托克斯(Navier-Stokes)解中高唤醒形成问题的神经网络模型性能改进问题
IF 1.6 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-07-30 DOI: 10.1108/ec-08-2023-0446
Ananthajit Ajaya Kumar, Ashwani Assam

Purpose

Deep-learning techniques are recently gaining a lot of importance in the field of turbulence. This study focuses on addressing the problem of data imbalance to improve the performance of an existing deep learning neural network to infer the Reynolds-averaged Navier–Stokes solution, proposed by Thuerey et al. (2020), in the cases of airfoils with high wake formation behind them. The model is based on a U-Net architecture, which calculates pressure and velocity solutions for fluid flow around an airfoil.

Design/methodology/approach

In this work, we propose various methods for training the model on selectively generated data with different distributions, which would be representative of the under-performing test samples. The property we chose for selectively generating data was the fraction of negative x-velocity in the domain. We have used Grad-CAM to compare the layer activations of different models trained using the proposed methods.

Findings

We observed that using our methods, the average performance on the samples with high wake formation (i.e. flow over airfoils at high angle of attack) has improved. Using one of the proposed methods, an average performance improvement of 15.65% was observed for samples of unknown airfoils compared to a similar model trained using the original method.

Originality/value

This work demonstrates the use of imbalanced learning in the field of fluid mechanics. The performance of the model is improved by giving significance to the distribution of the training data without changes to the model architecture.

目的深度学习技术最近在湍流领域越来越受到重视。本研究的重点是解决数据不平衡问题,以提高现有深度学习神经网络的性能,从而推断 Thuerey 等人(2020 年)提出的雷诺平均纳维-斯托克斯解,在机翼后方形成高尾流的情况下的应用。该模型基于 U-Net 架构,可计算机翼周围流体流动的压力和速度解。在这项工作中,我们提出了多种方法,用于在选择性生成的具有不同分布的数据上训练模型,这些数据将代表性能不佳的测试样本。我们选择的选择性生成数据的属性是域中负 X 速度的分数。我们使用 Grad-CAM 比较了使用建议方法训练的不同模型的层激活情况。研究结果我们发现,使用我们的方法,在具有高尾流形成的样本上(即以高攻角流过翼面)的平均性能有所改善。与使用原始方法训练的类似模型相比,使用其中一种建议的方法,未知机翼样本的平均性能提高了 15.65%。在不改变模型结构的情况下,通过赋予训练数据分布以意义,提高了模型的性能。
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引用次数: 0
Investigation of a novel hydraulic tunnel composite lining with polyurea coating interlayer 带聚脲涂层夹层的新型水工隧道复合衬砌研究
IF 1.6 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-07-29 DOI: 10.1108/ec-01-2024-0011
Bingqi Li, Jilei Zhang, Xiaonan Liu, Tianyi Meng

Purpose

Multilayer composite liner structures are the primary structural form of hydraulic tunnels. However, the bearing mechanism of multilayer composite liners has not been investigated thoroughly. Many existing design schemes do not properly achieve a balance between structural safety, anti-seepage capacity, and cost effectiveness. Thus, a new composite liner structure type and its theoretical model was proposed.

Design/methodology/approach

A novel hydraulic tunnel composite liner structure with a polyurea spray coating interlayer was proposed in this study. A theoretical model based on the state-space method was developed and verified using FEM models and existing theoretical models. Parametric analysis was conducted based on the theoretical model to investigate the influence of various variables, including interfacial shear stiffness, inner liner thickness, and outer liner elastic modulus.

Findings

It was concluded that the proposed theoretical model can be used successfully to calculate multilayer composite liner structures with high calculation efficiency. The overall deformation stiffness of the composite liner system increased with the interfacial shear stiffness. The sprayed coating interlayer significantly affects the residual force distribution between the outer and inner liners, which can also be affected by the adjustment of the thickness of the outer and inner liners. Thus, attention should be paid to these factors in the rational design of the proposed composite liner system.

Originality/value

With the development of China’s water conservancy projects, complex geological conditions, high surrounding rock stress, high internal and external water pressures, and other unique application scenarios have gradually increased. This places higher requirements on the bearing performance and impermeability of hydraulic tunnel lining structures. On the other hand, conventional hydraulic tunnel lining structures can hardly achieve a satisfactory balance between economy, structural safety, and impermeability. Thus, the proposed structure has the potential to be used in a wide range of applications.

目的 多层复合衬砌结构是水工隧道的主要结构形式。然而,多层复合衬砌的承载机理尚未得到深入研究。现有的许多设计方案并不能很好地实现结构安全性、抗渗能力和成本效益之间的平衡。因此,本研究提出了一种新型复合衬砌结构类型及其理论模型。设计/方法/途径本研究提出了一种带有聚脲喷涂中间层的新型水工隧道复合衬砌结构。利用有限元模型和现有理论模型,开发并验证了基于状态空间法的理论模型。根据理论模型进行了参数分析,研究了界面剪切刚度、内衬厚度和外衬弹性模量等各种变量的影响。复合衬垫系统的整体变形刚度随界面剪切刚度的增加而增加。喷涂涂层夹层会显著影响外衬和内衬之间的残余力分布,调整外衬和内衬的厚度也会影响残余力分布。原创性/价值随着我国水利工程的发展,复杂的地质条件、高围岩应力、高内外水压力等独特的应用场景逐渐增多。这就对水工隧洞衬砌结构的承载性能和防渗性能提出了更高的要求。另一方面,传统的水工隧道衬砌结构很难在经济性、结构安全性和防渗性之间取得令人满意的平衡。因此,拟议的结构具有广泛的应用潜力。
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引用次数: 0
Use of machine learning in determining the parameters of viscoplastic models 利用机器学习确定粘性模型参数
IF 1.6 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-07-29 DOI: 10.1108/ec-02-2024-0166
Jiří Halamka, Michal Bartošák

Purpose

The constitutive models determine the mechanical response to the defined loading based on model parameters. In this paper, the inverse problem is researched, i.e. the identification of the model parameters based on the loading and responses of the material. The conventional methods for determining the parameters of constitutive models often demand significant computational time or extensive model knowledge for manual calibration. The aim of this paper is to introduce an alternative method, based on artificial neural networks, for determining the parameters of a viscoplastic model.

Design/methodology/approach

An artificial neural network was proposed to determine nine material parameters of a viscoplastic model using data from three half-life hysteresis loops. The proposed network was used to determine the material parameters from uniaxial low-cycle fatigue experimental data of an aluminium alloy obtained at elevated temperatures and three different mechanical strain rates.

Findings

A reasonable correlation between experimental and numerical data was achieved using the determined material parameters.

Originality/value

This paper fulfils a need to research alternative methods of identifying material parameters.

目的构成模型根据模型参数确定对确定加载的机械响应。本文研究的是逆问题,即根据加载和材料响应确定模型参数。确定构成模型参数的传统方法通常需要大量的计算时间或丰富的模型知识来进行手动校准。本文旨在介绍一种基于人工神经网络的替代方法,用于确定粘塑性模型的参数。设计/方法/途径利用三个半衰期滞后环的数据,提出了一种人工神经网络,用于确定粘塑性模型的九个材料参数。根据铝合金在高温和三种不同机械应变速率下获得的单轴低循环疲劳实验数据,利用提出的网络确定材料参数。研究结果利用确定的材料参数实现了实验数据和数值数据之间的合理相关性。
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引用次数: 0
Automatic identification of macroscopic constitutive parameters for polycrystalline materials based on computational homogenisation 基于计算均质化自动识别多晶材料的宏观构成参数
IF 1.6 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Pub Date : 2024-07-26 DOI: 10.1108/ec-12-2023-0908
Guilherme Fonseca Gonçalves, Rui Pedro Cardoso Coelho, Igor André Rodrigues Lopes

Purpose

The purpose of this research is to establish a robust numerical framework for the calibration of macroscopic constitutive parameters, based on the analysis of polycrystalline RVEs with computational homogenisation.

Design/methodology/approach

This framework is composed of four building-blocks: (1) the multi-scale model, consisting of polycrystalline RVEs, where the grains are modelled with anisotropic crystal plasticity, and computational homogenisation to link the scales, (2) a set of loading cases to generate the reference responses, (3) the von Mises elasto-plastic model to be calibrated, and (4) the optimisation algorithms to solve the inverse identification problem. Several optimisation algorithms are assessed through a reference identification problem. Thereafter, different calibration strategies are tested. The accuracy of the calibrated models is evaluated by comparing their results against an FE2 model and experimental data.

Findings

In the initial tests, the LIPO optimiser performs the best. Good results accuracy is obtained with the calibrated constitutive models. The computing time needed by the FE2 simulations is 5 orders of magnitude larger, compared to the standard macroscopic simulations, demonstrating how this framework is suitable to obtain efficient micro-mechanics-informed constitutive models.

Originality/value

This contribution proposes a numerical framework, based on FE2 and macro-scale single element simulations, where the calibration of constitutive laws is informed by multi-scale analysis. The most efficient combination of optimisation algorithm and definition of the objective function is studied, and the robustness of the proposed approach is demonstrated by validation with both numerical and experimental data.

研究目的本研究的目的是在利用计算均质化分析多晶 RVE 的基础上,为校准宏观构成参数建立一个稳健的数值框架。设计/方法/途径该框架由四个构件组成:(1) 多尺度模型,由多晶 RVE 组成,其中晶粒采用各向异性晶体塑性建模,计算均质化将各尺度连接起来;(2) 一组加载案例,用于生成参考响应;(3) 冯-米塞斯弹塑性模型,用于校准;(4) 优化算法,用于解决逆识别问题。通过参考识别问题对几种优化算法进行了评估。之后,对不同的校准策略进行了测试。在最初的测试中,LIPO 优化器表现最佳。校准后的结构模型获得了良好的结果精度。与标准宏观模拟相比,FE2 模拟所需的计算时间增加了 5 个数量级,这表明该框架适合于获得高效的微观力学信息构成模型。研究了优化算法和目标函数定义的最有效组合,并通过数值和实验数据的验证证明了所提方法的稳健性。
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Engineering Computations
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