Acta Mechanica Sinica最新文献_第5页

Prediction of stress concentration near voids using crystal plasticity modelling

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

Contact between deformed rough surfaces 变形粗糙表面之间的接触

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-20 DOI: 10.1007/s10409-024-24905-x

Liao-Liang Ke

引用次数: 0

Experimental study on unsteady flow of hydraulic conveying of a single coarse particle through a 90° bend 单粒粗颗粒90°弯道水力输送不稳定流动试验研究

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-20 DOI: 10.1007/s10409-024-24339-x

Hui Cheng (, ), Hong Xiong (, ), Yuxiang Chen (, ), Hong Zhu (, ), Chunliang Yu (, ), Guodong Zheng (, ), Yiyang Xing (, )

{"title":"Experimental study on unsteady flow of hydraulic conveying of a single coarse particle through a 90° bend","authors":"Hui Cheng \u0000 (, ), Hong Xiong \u0000 (, ), Yuxiang Chen \u0000 (, ), Hong Zhu \u0000 (, ), Chunliang Yu \u0000 (, ), Guodong Zheng \u0000 (, ), Yiyang Xing \u0000 (, )","doi":"10.1007/s10409-024-24339-x","DOIUrl":"10.1007/s10409-024-24339-x","url":null,"abstract":"<div><p>Bends contribute to a flexible layout of pipeline system, but also lead to intensive energy costs due to the complex flow characteristic. This experimental study is conducted to investigate the impact of a single coarse particle on the flow field in a bend. The velocity profiles of fluid on the axial symmetry plane of the bend are measured using time-resolved particle image velocimetry. The flow structures are extracted using the proper orthogonal decomposition method. The results reveal that there is a shear-layer flow in the bend during the transportation. With the increase in particle size, the particle has a dominant influence on the flow energy distribution of the overall flow. The impact of particles on the first few energetic flows is mainly in the latter part of the transportation, both temporally and spatially. As the particle size decreases, the most energetic unsteady flow within the bend changes from the convective flow to the flow of the shear layer.\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 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889823","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

Buckling and post-buckling behavior of ideal and non-ideal FG-GPLRC beams in thermal environment 理想和非理想FG-GPLRC梁在热环境下的屈曲和后屈曲行为

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-20 DOI: 10.1007/s10409-024-24374-x

Wachirawit Songsuwan, Son Thai, Nuttawit Wattanasakulpong

{"title":"Buckling and post-buckling behavior of ideal and non-ideal FG-GPLRC beams in thermal environment","authors":"Wachirawit Songsuwan, Son Thai, Nuttawit Wattanasakulpong","doi":"10.1007/s10409-024-24374-x","DOIUrl":"10.1007/s10409-024-24374-x","url":null,"abstract":"<div><p>This investigation aims to analyze thermal buckling and post-buckling behavior of functionally graded graphene nanoplatelet-reinforced composite (FG-GPLRC) beams. The beams are classified into two types of ideal and non-ideal FG-GPLRC beams in which the ideal beams have smooth profiles of material distributions and another beams have layer-wise distributions of materials. The material profiles of the ideal beams are utilized as the controlling tracks for producing the material distributions of the non-ideal beams via a layer-to-layer integration technique. This technique confirms that the overall weight fraction of the materials is the same for both types of beams. The proposed models can be used to determine the material properties of the beams for further investigation on thermal buckling and post-buckling of the beams. Third-order shear deformation theory is employed to construct the energy equations of the problems, and then they are solved by the implementation of the Jacobi-Ritz method cooperating with the direct iteration procedure and Newton-Raphson technique. From our investigation, it can be disclosed that when non-ideal beams are created using ideal beams parabolic profile, the results differ significantly. However, the differences between the results of ideal and non-ideal beams can be eliminated by adding more layers.\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":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889824","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

On the windward boundary layer transition over a hypersonic blunt cone with global stability analyses and experiments 高超声速钝锥迎风边界层转捩的全局稳定性分析与实验

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-20 DOI: 10.1007/s10409-024-24150-x

Kuo Chen (, ), Xiaohu Li (, ), Guohua Tu (, ), Bingbing Wan (, ), Bin Zhang (, ), Jianqiang Chen (, ), Jiufen Chen (, )

{"title":"On the windward boundary layer transition over a hypersonic blunt cone with global stability analyses and experiments","authors":"Kuo Chen \u0000 (, ), Xiaohu Li \u0000 (, ), Guohua Tu \u0000 (, ), Bingbing Wan \u0000 (, ), Bin Zhang \u0000 (, ), Jianqiang Chen \u0000 (, ), Jiufen Chen \u0000 (, )","doi":"10.1007/s10409-024-24150-x","DOIUrl":"10.1007/s10409-024-24150-x","url":null,"abstract":"<div><p>This paper investigates the effect of the angle-of-attack (AOA) on the windward boundary-layer stability over a blunt cone with a nose radius of 5 mm. We consider a free-stream Mach number of 6 and a unit Reynolds number of 4.0 × 10<sup>7</sup> m<sup>−1</sup> and conduct both wind-tunnel experiments and stability analyses for AOAs ranging from 2°–10° at intervals of 2°. The results suggest that, as the AOA increases, the pressure gradient across the spanwise range becomes more pronounced, and the windward-side boundary layer becomes thinner. Using bi-global stability analysis, two unstable three-dimensional modes (varicose and sinuous) are identified in the windward boundary layer at various AOAs. The most unstable mode is the varicose V1 mode, in which the amplitude peak is initially close to the windward centerline and gradually shifts to the centerline downstream. Hence, the primary unstable disturbance exhibits a “V-like” distribution along the streamwise direction, which is likely to cause the V-shaped transition front observed in the wind-tunnel experiments. The eN method based on bi-global analysis is used to predict the transition location along the centerline on the windward region of the cone. The results indicate that, as the AOA increases, the transition location shifts forward, in line with our experimental results. Moreover, linear stability theory accurately predicts the eigenfunction and growth rate of the V1 mode obtained from bi-global analysis. This indicates that linear stability theory can be used to predict transitions in the windward boundary layer of a blunt cone at large AOAs under the conditions studied in this paper.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941100","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