International Journal of Engineering Science最新文献

Electrokinetic energy conversion efficiency in carbon nanotubes 碳纳米管的电动能转换效率

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2025-04-23 DOI: 10.1016/j.ijengsci.2025.104263

Yongbo Liu , Yongjun Jian

{"title":"Electrokinetic energy conversion efficiency in carbon nanotubes","authors":"Yongbo Liu , Yongjun Jian","doi":"10.1016/j.ijengsci.2025.104263","DOIUrl":"10.1016/j.ijengsci.2025.104263","url":null,"abstract":"<div><div>The electrokinetic energy conversion (EKEC) of pressure driven flow in carbon nanotubes (CNTs) is of great interest due to its potential high conversion efficiency. The existing EKEC theories had made many simplified assumptions for this problem, such as the surface charge is fixed on the surface and can not move, the slip length is independent of pipe diameter and the surface charge density is decoupled from the solution concentration. In order to get more accurate conversion efficiency, the prior theoretical models of EKEC in CNTs are revised in this paper by focusing on the combined influence of surface charge mobility and tube diameter on slip length and conversion efficiency. In addition, the surface charge density is no longer viewed as a constant, but a function of solution concentration of the electrolyte solution inside the CNTs. Results show that considering the surface charge mobility will reduce the EKEC efficiency. However, the decrease of tube diameter could enhance the EKEC efficiency. In order to maximize the EKEC efficiency, we give the optimal values of corresponding parameters. The maximum EKEC efficiency obtained in this paper is 18.8 %, which is obtained for the pressure driven flow of a LiCl solution with a concentration of 2 mM through a CNT with a radius of 15 nm.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"213 ","pages":"Article 104263"},"PeriodicalIF":5.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Utilization of the quadratic Hill yield function to model Ti-6Al-4V within multiplicative finite strain kinematics 利用二次Hill屈服函数对Ti-6Al-4V进行乘法有限应变运动学建模

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2025-04-23 DOI: 10.1016/j.ijengsci.2025.104268

Jakob Platen, Johannes Storm, Michael Kaliske

引用次数: 0

General shape transformations of thin hyperelastic shells through stress-free differential growth 通过无应力差分增长实现超弹性薄壳的一般形状变换

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2025-04-16 DOI: 10.1016/j.ijengsci.2025.104266

Zhanfeng Li , Jiong Wang

{"title":"General shape transformations of thin hyperelastic shells through stress-free differential growth","authors":"Zhanfeng Li , Jiong Wang","doi":"10.1016/j.ijengsci.2025.104266","DOIUrl":"10.1016/j.ijengsci.2025.104266","url":null,"abstract":"<div><div>To address the needs of engineering applications, researchers often wish that the shapes of samples can be precisely controlled. The current work aims to propose a promising approach, i.e., through stress-free differential growth, to realize general shape transformations of thin hyperelastic shells. First, within the finite-strain regime, we formulate the 3D governing equations system for modeling the growth behavior of hyperelastic shells. To facilitate the derivations, it is assumed that the shell sample attains the stress-free state in its current configuration. Subsequently, through series expansions of the unknown variables, we derive the explicit analytical formulas that elucidate the intricate relationships between growth functions and the geometric quantities of general 3D target surfaces. Based on these analytical formulas, we propose a theoretical framework for controlling the shape changes of the shell sample from the reference configuration to a desired target configuration. Notably, our framework accommodates a wide array of geometric mappings, including topology transformation, conformal mapping, and isometry mapping. To promote applications of the theoretical framework, a numerical scheme is further proposed to achieve shape transformations of shell samples between complex surfaces without explicit parametric equations. Both the theoretical framework and the numerical scheme are validated through 3D finite element simulations. The results of the current work can be applied for the design of novel intelligent soft devices, which also reveal the connections between solid mechanics and differential geometry.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"213 ","pages":"Article 104266"},"PeriodicalIF":5.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Design and control of multi-branch and multi-segment-based dielectric elastomer actuator and biomimetic applications 多分支多段介电弹性体致动器的设计与控制及仿生应用

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2025-04-12 DOI: 10.1016/j.ijengsci.2025.104271

Haihao Ci, Zhan-Sheng Guo

{"title":"Design and control of multi-branch and multi-segment-based dielectric elastomer actuator and biomimetic applications","authors":"Haihao Ci, Zhan-Sheng Guo","doi":"10.1016/j.ijengsci.2025.104271","DOIUrl":"10.1016/j.ijengsci.2025.104271","url":null,"abstract":"<div><div>Dielectric elastomer actuators (DEAs) based on the dielectric elastomer minimum energy structure (DEMES) exhibit excellent dynamic shape deformation and fast response characteristics, making them widely applicable in flexible actuators, smart grippers, and biomimetic devices. While existing studies have explored the fundamental mechanisms of DEMES, most focus on simple structural types or single application scenarios. However, a systematic approach for designing, modeling, and computing versatile, complex DEAs remains underexplored. In this work, the nonlinear motion equations for an electroelastic cantilever plate are derived based on Hamilton's principle to capture the nonlinear behavior of DEAs. Multi-structured single-segment DEAs are designed to investigate the influence of the driven shape and geometric configuration of the frame on actuator performance. Additionally, complex deformations and grasping strategies for four-branch single-segment and six-segment DEAs are analyzed in detail, considering the actuation of individual branches and parts of each segment. An octopus-inspired variable-stiffness DEA is designed to grasp polygonal objects of varying sizes and shapes using diverse voltage control strategies. Different hand gestures are mimicked by independently controlling each segment and finger of a human hand-based DEA. The accuracy of the three-segment and six-segment DEMES is validated by comparison with rotary joint experiments and a microsatellite gripper, respectively. Additionally, a duty cycle voltage strategy that enables the variation of the flapping angle of a rotary joint to closely match real flight conditions is proposed. The results confirm the independence and controllability of multi-branch and multi-segment DEAs in complex tasks. This research offers new insights and methodologies to advance the field of flexible actuators, highlighting the vast application potential of DEAs in multi-task and multi-objective operations.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"212 ","pages":"Article 104271"},"PeriodicalIF":5.7,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

A large-deformation investigation into the electromechanically coupled sensing performances of flexible nanoparticle-reinforced composite stretch sensors 柔性纳米颗粒增强复合拉伸传感器机电耦合传感性能的大变形研究

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2025-04-12 DOI: 10.1016/j.ijengsci.2025.104265

Xiaodong Xia , Yu Su , Chuang Feng , George J. Weng

{"title":"A large-deformation investigation into the electromechanically coupled sensing performances of flexible nanoparticle-reinforced composite stretch sensors","authors":"Xiaodong Xia , Yu Su , Chuang Feng , George J. Weng","doi":"10.1016/j.ijengsci.2025.104265","DOIUrl":"10.1016/j.ijengsci.2025.104265","url":null,"abstract":"<div><div>In contrast to the conventional strain sensors under the small-deformation condition, the large-deformation analysis on the flexible nanocomposite-reinforced stretch sensors remains to be investigated. In this research, an extended multi-field coupled homogenization model has been developed to illustrate the nonlinear stretch sensing capacities of flexible nanoparticle-reinforced composite sensors. In this analysis, the stretch-dependent pseudo-moduli and conductivity are chosen as the dual homogenization parameters of current stretch sensing analysis. The predicted resistance change ratio and stretch sensitivity factor are consistent with the experimental data of silver nanoparticle/PDMS nanocomposite sensors over a broad range of stretch loading. The nonlinear stretch sensing performance is attributed to the shape deformation of nanoparticles and significant variation of tunneling distance. The uncovered stretch sensing capacities can provide the directions to optimize flexible nanoparticle-reinforced composite sensors in the area of electronic skin.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"212 ","pages":"Article 104265"},"PeriodicalIF":5.7,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 extension of the concept of rheological connections to a finite deformation framework using multiple natural configurations 流变连接的概念扩展到使用多种自然构型的有限变形框架

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2025-04-12 DOI: 10.1016/j.ijengsci.2025.104267

Tarun Singh, Sandipan Paul

引用次数: 0

Nonlinear theory and finite element analysis of cylindrical deformation of hyperelastic thick rods 超弹性粗杆圆柱变形的非线性理论与有限元分析

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2025-04-10 DOI: 10.1016/j.ijengsci.2025.104269

J. Chróścielewski, A. Sabik, W. Witkowski

引用次数: 0

Dynamic behaviour of state-based peridynamic media through analysis of potential fields 基于势场分析的状态周动力介质的动力行为

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2025-04-09 DOI: 10.1016/j.ijengsci.2025.104261

Subrata Mondal, Anasuyakumari Maram, Sudarshan Dhua

{"title":"Dynamic behaviour of state-based peridynamic media through analysis of potential fields","authors":"Subrata Mondal, Anasuyakumari Maram, Sudarshan Dhua","doi":"10.1016/j.ijengsci.2025.104261","DOIUrl":"10.1016/j.ijengsci.2025.104261","url":null,"abstract":"<div><div>Unlike classical theories, which rely on local interactions and differential equations, peridynamic theory employs integro-differential equations to describe the mechanics of materials and structures. This distinctive approach allows peridynamics to naturally incorporate long-range forces and discontinuities, such as cracks, which are challenging to handle using classical partial differential equations. In this study, a novel approach for the implementation of nonlocal Helmholtz-Hodge decomposition is used to decompose the displacement field into components that are divergence-free and curl-free. State-based peridynamics, which was introduced to overcome the limitations of bond-based peridynamics, has been considered in this work. As a consequence, two governing equations involving integrals are derived, which are associated with potential fields. An analysis of the propagation of waves has been performed to determine the dispersion relation for both longitudinal and transverse waves. The general solutions for initial-value problems are derived, and the closed-form expression for Green’s function in terms of potential fields is obtained. This study considers Gaussian, exponential, and constant functions as nonlocality functions. Graphs are demonstrated to illustrate the variations in frequency, phase velocity with changes in the size of the horizon (which represents nonlocal length) and nonlocality functions. The validation is achieved both analytically and numerically by ensuring classical correspondence in the limit of the nonlocality parameters approach zero. This work implements nonlocal Helmholtz decomposition, a robust framework that simplifies the study and provides comprehensive insight while analysing vector fields.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"212 ","pages":"Article 104261"},"PeriodicalIF":5.7,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2025-04-03 DOI: 10.1016/j.ijengsci.2025.104262

Dia Zeidan , Pabitra Kumar Pradhan , Manoj Pandey

引用次数: 0

Comparison of semi-empirical models, symbolic regression, and machine learning approaches for prediction of tensile strength in steels 比较半经验模型，符号回归和机器学习方法预测钢的抗拉强度

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2025-04-01 DOI: 10.1016/j.ijengsci.2025.104247

Gerfried Millner , Gabriel Kronberger , Manfred Mücke , Lorenz Romaner , Daniel Scheiber

{"title":"Comparison of semi-empirical models, symbolic regression, and machine learning approaches for prediction of tensile strength in steels","authors":"Gerfried Millner , Gabriel Kronberger , Manfred Mücke , Lorenz Romaner , Daniel Scheiber","doi":"10.1016/j.ijengsci.2025.104247","DOIUrl":"10.1016/j.ijengsci.2025.104247","url":null,"abstract":"<div><div>We employ data-driven models to predict the tensile strength of steel coils using information on their chemical composition and process parameters. The dataset contains extensive chemical analyses, diverse process parameters, and the characterized tensile strength as target property. We compare prediction quality and traceability of the predictions of pure machine learning models and physics-informed models. To introduce physical knowledge, we combine models from literature knowledge with symbolic regression and compare the physics-inspired models to machine learning models. In contrast to classic black-box models, symbolic regression provides mathematical equations for the estimation of the target value, facilitating straightforward interpretation. To analyze the predictions from classic black-box machine learning models, we use feature importance analysis with SHAP and contrast the obtained feature impacts with physics-based model parameters. We find that for the present use case, Artificial Neural Networks perform best, while the physics-infused models from symbolic regression allow for better interpretability.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"212 ","pages":"Article 104247"},"PeriodicalIF":5.7,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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