Acta Mechanica Sinica最新文献_第7页

Artificial neural network validation of MHD natural bioconvection in a square enclosure: entropic analysis and optimization 方框内MHD自然生物对流的人工神经网络验证：熵分析与优化

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-22 DOI: 10.1007/s10409-024-24507-x

Noura Alsedais, Mohamed Ahmed Mansour, Abdelraheem Mahmoud Aly, Sara I. Abdelsalam

{"title":"Artificial neural network validation of MHD natural bioconvection in a square enclosure: entropic analysis and optimization","authors":"Noura Alsedais, Mohamed Ahmed Mansour, Abdelraheem Mahmoud Aly, Sara I. Abdelsalam","doi":"10.1007/s10409-024-24507-x","DOIUrl":"10.1007/s10409-024-24507-x","url":null,"abstract":"<div><p>This study numerically investigates inclined magneto-hydrodynamic natural convection in a porous cavity filled with nanofluid containing gyrotactic microorganisms. The governing equations are nondimensionalized and solved using the finite volume method. The simulations examine the impact of key parameters such as heat source length and position, Peclet number, porosity, and heat generation/absorption on flow patterns, temperature distribution, concentration profiles, and microorganism rotation. Results indicate that extending the heat source length enhances convective currents and heat transfer efficiency, while optimizing the heat source position reduces entropy generation. Higher Peclet numbers amplify convective currents and microorganism distribution complexity. Variations in porosity and heat generation/absorption significantly influence flow dynamics. Additionally, the artificial neural network model reliably predicts the mean Nusselt and Sherwood numbers (<span>(overline{Nu})</span> & <span>(overline{Sh})</span>), demonstrating its effectiveness for such analyses. The simulation results reveal that increasing the heat source length significantly enhances heat transfer, as evidenced by a 15% increase in the mean Nusselt number.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Designing strong and tough lattice materials: the advantage of nonlocal lattices 设计强韧的晶格材料：非局部晶格的优势

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-22 DOI: 10.1007/s10409-024-24662-x

Wanlu Wang (, ), Junjie Liu (, ), Qingsheng Yang (, )

{"title":"Designing strong and tough lattice materials: the advantage of nonlocal lattices","authors":"Wanlu Wang \u0000 (, ), Junjie Liu \u0000 (, ), Qingsheng Yang \u0000 (, )","doi":"10.1007/s10409-024-24662-x","DOIUrl":"10.1007/s10409-024-24662-x","url":null,"abstract":"<div><p>Developing lightweight lattice materials that possess exceptional strength, stiffness, and toughness (or energy absorption) simultaneously remains a significant challenge. In this study, we develop a novel design strategy: incorporating nonlocal interactions into lattice beams, creating “nonlocal lattices”. Utilizing simulation experiments, we investigated the bending behaviors of these lattices, with a particular focus on their damage evolution. Interestingly, these nonlocal lattices, categorized as stretch-dominated, exhibit extraordinary peak force (strength) and stiffness (modulus) comparable to traditional stretch-dominated lattices, while maintaining superior energy absorption (toughness). Analysis of damage evolution within the lattice beams reveals a transition from localized to dispersed damage patterns. This transition delays strain localization, thereby improving material utilization efficiency. Furthermore, stronger nonlocal interaction leads to a more dispersed damage zone, further improving materials utilization efficiency. These findings demonstrate that nonlocal lattices achieve excellent energy dissipation (toughness) without compromising strength and stiffness. This highlights the crucial role of nonlocal interactions in governing strain localization within lattice materials. The design strategy here unlocks new inspirations for the development of strong and tough lightweight materials.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hybrid 3D numerical simulations on mechanical behavior and microstructure evolution in face-centered cubic metals 面心立方金属力学行为与微观结构演变的混合三维数值模拟

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-22 DOI: 10.1007/s10409-024-24481-x

Xusheng Hai (, ), Ben Fang (, ), Tao Fang (, ), Xiaoqiang Wang (, ), Xiaoding Wei (, )

{"title":"Hybrid 3D numerical simulations on mechanical behavior and microstructure evolution in face-centered cubic metals","authors":"Xusheng Hai \u0000 (, ), Ben Fang \u0000 (, ), Tao Fang \u0000 (, ), Xiaoqiang Wang \u0000 (, ), Xiaoding Wei \u0000 (, )","doi":"10.1007/s10409-024-24481-x","DOIUrl":"10.1007/s10409-024-24481-x","url":null,"abstract":"<div><p>Accurately predicting the mechanical behavior of pure metals at different radiation doses and prescribing the microstructure evolutions, such as the dislocation structures, remain challenging. This work introduces a 3D hybrid numerical simulation scheme that integrates finite element (FE) and finite difference (FD) modules. The FE module is used to implement the crystal plasticity model, while the FD module is used to solve the reaction-diffusion model regarding dislocation nucleation and transportation. Our hybrid model successfully replicates the mechanical behavior of pristine Cu single crystals and provides details of dislocation cell structures that agree with the experimental observation. Furthermore, the model effectively reflects the irradiation hardening effects for Cu single crystals and demonstrates the formation of dislocation channels and shear band type of strain localization. Our work offers an effective approach for predicting the mechanical responses and the safety evaluation of pure metals in extreme working conditions.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 11","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Energy spectrum analysis of compressible flow based on MHz-PIV 基于MHz-PIV的可压缩流能谱分析

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-22 DOI: 10.1007/s10409-024-24574-x

Xintao Lu (, ), Hang Zhao (, ), Xing Wei (, ), Zhen Yang (, ), Menggang Kang (, ), Hua Yang (, ), Shuang Chen (, ), Fang Zhang (, ), Qi Gao (, )

{"title":"Energy spectrum analysis of compressible flow based on MHz-PIV","authors":"Xintao Lu \u0000 (, ), Hang Zhao \u0000 (, ), Xing Wei \u0000 (, ), Zhen Yang \u0000 (, ), Menggang Kang \u0000 (, ), Hua Yang \u0000 (, ), Shuang Chen \u0000 (, ), Fang Zhang \u0000 (, ), Qi Gao \u0000 (, )","doi":"10.1007/s10409-024-24574-x","DOIUrl":"10.1007/s10409-024-24574-x","url":null,"abstract":"<div><p>High-speed flows have consistently presented significant challenges to experimental research due to their complex and unsteady characteristics. This study investigates the use of the megahertz-frequency particle image velocimetry (MHz-PIV) technique to enhance time resolution under high-speed flow conditions. In our experiments, five high-speed cameras were utilized in rapid succession to capture images of the same measurement area, achieving ultra-high time resolution particle image data. Through advanced image processing techniques, we corrected optical distortions and identified common areas among the captured images. The implementation of a sliding average algorithm, along with spectral analysis of the compressible turbulent flow field based on velocity data, facilitated a comprehensive analysis. The results confirm the capability of MHz-PIV for high-frequency sampling, significantly reducing reliance on individual camera performance. This approach offers a refined measurement method with superior spatiotemporal resolution for high-speed flow experiments.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of stress concentration near voids using crystal plasticity modelling 利用晶体塑性模型预测孔洞附近的应力集中

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-22 DOI: 10.1007/s10409-024-24484-x

Jiaxuan Wang (, ), Han Wu (, ), Rou Du (, ), Hansong Ma (, ), Xiaoming Liu (, )

引用次数: 0

A approach for the identification and localization of dynamic loads in time-varying systems 时变系统中动态载荷的识别与定位方法

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-21 DOI: 10.1007/s10409-024-24359-x

Yixiao Li (, ), Fang Zhang (, ), Jinhui Jiang (, )

引用次数: 0

Vibration characteristics of vehicle-pavement coupled system with non-uniform dynamic tire model based on nonlinear Timoshenko foundation beam 基于非线性Timoshenko基础梁的非均匀动力轮胎模型车辆-路面耦合系统振动特性

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-21 DOI: 10.1007/s10409-024-24219-x

Tongtong Wang (, ), Shaopu Yang (, ), Junning Zhang (, ), Yongjie Lu (, )

{"title":"Vibration characteristics of vehicle-pavement coupled system with non-uniform dynamic tire model based on nonlinear Timoshenko foundation beam","authors":"Tongtong Wang \u0000 (, ), Shaopu Yang \u0000 (, ), Junning Zhang \u0000 (, ), Yongjie Lu \u0000 (, )","doi":"10.1007/s10409-024-24219-x","DOIUrl":"10.1007/s10409-024-24219-x","url":null,"abstract":"<div><p>To thoroughly examine the complex relationships between tire and pavement vibrations, a sophisticated vehicle-pavement coupled system is proposed, incorporating a non-uniform dynamic friction force between the tire and the pavement. According to the Timoshenko beam theory, a dynamic model of pavement structure with a finite length beam was formulated on a nonlinear Pasternak foundation. To more accurately describe the coupling relationship between the tire and the pavement, and to take into account the vibration state under vehicle-pavement interaction, the load distribution between the tire and the pavement is modeled as a dynamic non-uniform contact. Combined with the classic LuGre tire model, the adhesion between the tire and the pavement is calculated. The Galerkin truncation method is employed to transform the pavement vibration partial differential equation into a finite ordinary differential equation, and the integral expression of the nonlinear foundation beam term is derived using the product to sum formula. By using the Runge-Kutta method, the tire-road coupled system can be numerically calculated, thus determining tire adhesion. This research demonstrates that compared with tire force under the traditional static load distribution, load distribution has a significant influence on adhesion. This study offers valuable insights for pavement structure design and vehicle performance control.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Boussinesq problem of a finite elastic layer with the surface effect 具有表面效应有限弹性层的Boussinesq问题

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-21 DOI: 10.1007/s10409-024-24352-x

Hui Wu (, ), Sha Xiao (, ), Zhilong Peng (, ), Ning Jia (, ), Shaohua Chen (, )

{"title":"Boussinesq problem of a finite elastic layer with the surface effect","authors":"Hui Wu \u0000 (, ), Sha Xiao \u0000 (, ), Zhilong Peng \u0000 (, ), Ning Jia \u0000 (, ), Shaohua Chen \u0000 (, )","doi":"10.1007/s10409-024-24352-x","DOIUrl":"10.1007/s10409-024-24352-x","url":null,"abstract":"<div><p>Both the thickness effect and surface effect should be important in nano-indentation behavior of coatings due to the finite thickness and small indentation size. As a basic solution, the two-dimensional Boussinesq problem of a finite elastic layer bonded to a rigid substrate is studied in this paper, employing the surface-energy-density-based elastic theory. The Airy stress function and Fourier integral transform methods are adopted to solve the problem. A nalytical solutions of both the stress and displacement fields are well achieved for a finite elastic layer under a concentrated force and a uniform pressure. Unlike the classical solutions, it is discovered that both the thickness effect and surface effect will show significant influences on the Boussinesq elastic behaviors. The surface effect would harden the finite elastic layer and induce a more uniformly distributing displacements and stresses. Only when the thickness is sufficiently large, the Boussinesq solution of an elastic half space may represent that of a finite elastic layer case. A generalized hardness is further defined to include the coupling effects of thickness and surface for the Boussinesq problem of a finite elastic layer. Such a study would assist in the design and property evaluation of coatings and micro-devices with layer-substrate structures.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mass-spring system modelling for biplane membrane flapping wings 双翼膜扑翼质量-弹簧系统建模

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-21 DOI: 10.1007/s10409-024-24093-x

Anh Tuan Nguyen, Thanh Dong Pham, Vu Dan Thanh Le, Quoc Tru Vu, Jae-Hung Han, Sang-Woo Kim

引用次数: 0

Physics-informed neural networks for predicting velocity and pressure fields from wave elevation based on Boussinesq model 基于Boussinesq模型预测波高程速度和压力场的物理信息神经网络

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-20 DOI: 10.1007/s10409-024-24322-x

Yao Hong (, ), Zhaoxin Gong (, ), Hua Liu (, )

{"title":"Physics-informed neural networks for predicting velocity and pressure fields from wave elevation based on Boussinesq model","authors":"Yao Hong \u0000 (, ), Zhaoxin Gong \u0000 (, ), Hua Liu \u0000 (, )","doi":"10.1007/s10409-024-24322-x","DOIUrl":"10.1007/s10409-024-24322-x","url":null,"abstract":"<div><p>The task of achieving high-accuracy full-field reconstruction in the realm of water waves is widely acknowledged as a challenge, primarily due to the sparsity and incompleteness of data measurement in both temporal and spatial dimensions. We develop a full-field velocity and pressure reconstruction approach for non-linear water waves based on physics-informed neural networks from the free surface measurement. The fully non-linear highly dispersive Boussinesq model is integrated to reduce the training cost by representing the three dimensional water wave problems in the horizontal two-dimensional plane with the inherent velocity distribution along water depth. A series of test cases, including the solitary waves, fifth-order Stokes waves, standing waves, and superimposed waves, are employed to evaluate the performance of the algorithm. The proposed novel neural networks are capable of accurately reconstructing the flow fields even when assimilating the limited and sparse free surface deformation data, which facilitates the development of detecting the flow characteristics in real ocean waves.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142913028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0