Theoretical and Applied Mechanics Letters最新文献_第10页

Sedimentation motion of sand particles in moving water (I): The resistance on a small sphere moving in non-uniform flow 砂粒在流动水中的沉降运动(一):在非均匀流动中运动的小球体上的阻力

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2022-11-01 DOI: 10.1016/j.taml.2022.100392

Shu-Tang Tsai

引用次数: 3

Elastoplastic constitutive modeling under the complex loading driven by GRU and small-amount data 基于GRU和少量数据驱动的复杂载荷下弹塑性本构建模

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2022-11-01 DOI: 10.1016/j.taml.2022.100363

Zefeng Yu , Chenghang Han , Hang Yang , Yu Wang , Shan Tang , Xu Guo

{"title":"Elastoplastic constitutive modeling under the complex loading driven by GRU and small-amount data","authors":"Zefeng Yu , Chenghang Han , Hang Yang , Yu Wang , Shan Tang , Xu Guo","doi":"10.1016/j.taml.2022.100363","DOIUrl":"10.1016/j.taml.2022.100363","url":null,"abstract":"<div><p>In this paper, a data-driven method to model the three-dimensional engineering structure under the cyclic load with the one-dimensional stress-strain data is proposed. In this method, one-dimensional stress-strain data obtained under uniaxial load and different loading history is learned offline by gate recurrent unit (GRU) network. The learned constitutive model is embedded into the general finite element framework through data expansion from one dimension to three dimensions, which can perform stress updates under the three-dimensional setting. The proposed method is then adopted to drive numerical solutions of boundary value problems for engineering structures. Compared with direct numerical simulations using the J2 plasticity model, the stress-strain response of beam structure with elastoplastic materials under forward loading, reverse loading and cyclic loading were predicted accurately. Loading path dependent response of structure was captured and the effectiveness of the proposed method is verified. The shortcomings of the proposed method are also discussed.</p></div>","PeriodicalId":46902,"journal":{"name":"Theoretical and Applied Mechanics Letters","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095034922000435/pdfft?md5=eb3173a33751c3f913e8e92f05dda63e&pid=1-s2.0-S2095034922000435-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43990834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Shapes of the fastest fish and optimal underwater and floating hulls 形状最快的鱼和最佳的水下和浮动船体

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2022-11-01 DOI: 10.1016/j.taml.2022.100378

Igor Nesteruk

引用次数: 1

Generalized boundary dilatation flux on a flexible wall 柔性壁面上的广义边界膨胀通量

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2022-11-01 DOI: 10.1016/j.taml.2022.100388

Tao Chen , Tianshu Liu

{"title":"Generalized boundary dilatation flux on a flexible wall","authors":"Tao Chen , Tianshu Liu","doi":"10.1016/j.taml.2022.100388","DOIUrl":"10.1016/j.taml.2022.100388","url":null,"abstract":"<div><p>In this paper, by applying theoretical method to the governing equations of compressible viscous flow, we derive the theoretical formula of the boundary dilatation flux (BDF) on a flexible wall, which generalizes the most recent work of Mao et al. (Acta Mechanica Sinica 38 (2022) 321583) for a stationary wall. Different boundary sources of dilatation are explicitly identified, revealing not only the boundary generation mechanisms of vortex sound and entropy sound, but also some additional sources due to the surface vorticity, surface angular velocity, surface acceleration and surface curvature. In particular, the generation mechanism of dilatation at boundary due to the coupled divergence terms is highlighted, namely, the product of the surface velocity divergence <span><math><mrow><mo>(</mo><msub><mrow><mi>∇</mi></mrow><mrow><mi>∂</mi><mi>B</mi></mrow></msub><mrow><mo>·</mo></mrow><mi>U</mi><mo>)</mo></mrow></math></span> and the vorticity-induced skin friction divergence <span><math><mrow><mo>(</mo><msub><mrow><mi>∇</mi></mrow><mrow><mi>∂</mi><mi>B</mi></mrow></msub><mrow><mo>·</mo></mrow><msub><mrow><mi>τ</mi></mrow><mrow><mi>ω</mi></mrow></msub><mo>)</mo></mrow></math></span>. The former is attributed to the surface flexibility while the latter characterizes the footprints of near-wall coherent structures. Therefore, by properly designing the surface velocity distribution, the dilatation generation at the boundary could be controlled for practical purpose in near-wall compressible viscous flows.</p></div>","PeriodicalId":46902,"journal":{"name":"Theoretical and Applied Mechanics Letters","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S209503492200068X/pdfft?md5=b1f6153c1715703c26ebb6a20558290b&pid=1-s2.0-S209503492200068X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44559565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Fourier neural operator approach to large eddy simulation of three-dimensional turbulence 三维湍流大涡模拟的傅里叶神经算子方法

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2022-11-01 DOI: 10.1016/j.taml.2022.100389

Zhijie Li , Wenhui Peng , Zelong Yuan , Jianchun Wang

引用次数: 16

Determination of the full-field stress and displacement using photoelasticity and sampling moiré method in a 3D-printed model 在3d打印模型中使用光弹性和采样法确定全场应力和位移

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2022-11-01 DOI: 10.1016/j.taml.2022.100380

Zhangyu Ren , Qi Zhang , Yang Ju , Huimin Xie

{"title":"Determination of the full-field stress and displacement using photoelasticity and sampling moiré method in a 3D-printed model","authors":"Zhangyu Ren , Qi Zhang , Yang Ju , Huimin Xie","doi":"10.1016/j.taml.2022.100380","DOIUrl":"10.1016/j.taml.2022.100380","url":null,"abstract":"<div><p>The quantitative characterization of the full-field stress and displacement is significant for analyzing the failure and instability of engineering materials. Various optical measurement techniques such as photoelasticity, moiré and digital image correlation methods have been developed to achieve this goal. However, these methods are difficult to incorporate to determine the stress and displacement fields simultaneously because the tested models must contain particles and grating for displacement measurement; however, these elements will disturb the light passing through the tested models using photoelasticity. In this study, by combining photoelasticity and the sampling moiré method, we developed a method to determine the stress and displacement fields simultaneously in a three-dimensional (3D)-printed photoelastic model with orthogonal grating. Then, the full-field stress was determined by analyzing 10 photoelastic patterns, and the displacement fields were calculated using the sampling moiré method. The results indicate that the developed method can simultaneously determine the stress and displacement fields.</p></div>","PeriodicalId":46902,"journal":{"name":"Theoretical and Applied Mechanics Letters","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095034922000605/pdfft?md5=425ac5fa9a5e329e7933efbe574a7b23&pid=1-s2.0-S2095034922000605-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41909765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Constitutive modeling of particle reinforced rubber-like materials 颗粒增强类橡胶材料的本构建模

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2022-11-01 DOI: 10.1016/j.taml.2022.100383

Sankalp Gour, Deepak Kumar

引用次数: 2

An iterative data-driven turbulence modeling framework based on Reynolds stress representation 基于Reynolds应力表示的迭代数据驱动湍流建模框架

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2022-09-01 DOI: 10.1016/j.taml.2022.100381

Yuhui Yin , Zhi Shen , Yufei Zhang , Haixin Chen , Song Fu

{"title":"An iterative data-driven turbulence modeling framework based on Reynolds stress representation","authors":"Yuhui Yin , Zhi Shen , Yufei Zhang , Haixin Chen , Song Fu","doi":"10.1016/j.taml.2022.100381","DOIUrl":"10.1016/j.taml.2022.100381","url":null,"abstract":"<div><p>Data-driven turbulence modeling studies have reached such a stage that the basic framework is settled, but several essential issues remain that strongly affect the performance. Two problems are studied in the current research: (1) the processing of the Reynolds stress tensor and (2) the coupling method between the machine learning model and flow solver. For the Reynolds stress processing issue, we perform the theoretical derivation to extend the relevant tensor arguments of Reynolds stress. Then, the tensor representation theorem is employed to give the complete irreducible invariants and integrity basis. An adaptive regularization term is employed to enhance the representation performance. For the coupling issue, an iterative coupling framework with consistent convergence is proposed and then applied to a canonical separated flow. The results have high consistency with the direct numerical simulation true values, which proves the validity of the current approach.</p></div>","PeriodicalId":46902,"journal":{"name":"Theoretical and Applied Mechanics Letters","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095034922000617/pdfft?md5=6783d9bb7e3216cea5e2989130578ec8&pid=1-s2.0-S2095034922000617-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45215656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Simulation and experimental analysis of melt pool evolution in laser engineered net shaping 激光工程成形过程中熔池演化的仿真与实验分析

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2022-09-01 DOI: 10.1016/j.taml.2022.100366

Zhuangzhuang Mao , Wei Feng , Ce Hao , Zhanwei Liu

{"title":"Simulation and experimental analysis of melt pool evolution in laser engineered net shaping","authors":"Zhuangzhuang Mao , Wei Feng , Ce Hao , Zhanwei Liu","doi":"10.1016/j.taml.2022.100366","DOIUrl":"10.1016/j.taml.2022.100366","url":null,"abstract":"<div><p>In this work, the evolution of melt pool under single-point and single-line printing in the laser engineered net shaping (LENS) process is analyzed. Firstly, the basic structure of the melt pool model of the LENS process is established and the necessary assumptions are made. Then, the establishment process of the multi-physical field model of the melt pool is introduced in detail. It is concluded that the simulation model results are highly consistent with the online measurement experiment results in terms of melt pool profile, space temperature gradient, and time temperature gradient. Meanwhile, some parameters, such as the 3D morphology and surface fluid field of the melt pool, which are not obtained in the online measurement experiment, are analyzed. Finally, the influence of changing the scanning speed on the profile, peak temperature, and temperature gradient of the single-line melt pool is also analyzed, and the following conclusions are obtained: With the increase in scanning speed, the profile of the melt pool gradually becomes slender; The relationship between peak temperature and scanning speed is approximately linear in a certain speed range; The space temperature gradient at the tail of the melt pool under different scanning speeds hardly changes with the scanning speed, and the time temperature gradient at the tail of the melt pool is in direct proportion to the scanning speed.</p></div>","PeriodicalId":46902,"journal":{"name":"Theoretical and Applied Mechanics Letters","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095034922000460/pdfft?md5=fb989ef85af7df0ed9ea512f878cc015&pid=1-s2.0-S2095034922000460-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44046687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A machine learning based solver for pressure Poisson equations 基于机器学习的压力泊松方程求解器

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2022-09-01 DOI: 10.1016/j.taml.2022.100362

Ruilin Chen , Xiaowei Jin , Hui Li

{"title":"A machine learning based solver for pressure Poisson equations","authors":"Ruilin Chen , Xiaowei Jin , Hui Li","doi":"10.1016/j.taml.2022.100362","DOIUrl":"10.1016/j.taml.2022.100362","url":null,"abstract":"<div><p>When using the projection method (or fractional step method) to solve the incompressible Navier-Stokes equations, the projection step involves solving a large-scale pressure Poisson equation (PPE), which is computationally expensive and time-consuming. In this study, a machine learning based method is proposed to solve the large-scale PPE. An machine learning (ML)-block is used to completely or partially (if not sufficiently accurate) replace the traditional PPE iterative solver thus accelerating the solution of the incompressible Navier-Stokes equations. The ML-block is designed as a multi-scale graph neural network (GNN) framework, in which the original high-resolution graph corresponds to the discrete grids of the solution domain, graphs with the same resolution are connected by graph convolution operation, and graphs with different resolutions are connected by down/up prolongation operation. The well trained ML-block will act as a general-purpose PPE solver for a certain kind of flow problems. The proposed method is verified via solving two-dimensional Kolmogorov flows (<em>Re</em> = 1000 and <em>Re</em> = 5000) with different source terms. On the premise of achieving a specified high precision (ML-block partially replaces the traditional iterative solver), the ML-block provides a better initial iteration value for the traditional iterative solver, which greatly reduces the number of iterations of the traditional iterative solver and speeds up the solution of the PPE. Numerical experiments show that the ML-block has great advantages in accelerating the solving of the Navier-Stokes equations while ensuring high accuracy.</p></div>","PeriodicalId":46902,"journal":{"name":"Theoretical and Applied Mechanics Letters","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2095034922000423/pdfft?md5=5c8d906e692de4b230ae17f34e0bc99b&pid=1-s2.0-S2095034922000423-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43052525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6