International Journal of Applied Mechanics最新文献

Mechanical Properties and Material Characterization of Magneto-Thermal Sensitive Hydrogels 磁热敏水凝胶的力学性能和材料表征

3区工程技术

International Journal of Applied Mechanics Pub Date : 2024-06-29 DOI: 10.1142/s1758825124500819

Hong Sang, Jianying Hu, Erasmo Carrera, Jianke Du

{"title":"Mechanical Properties and Material Characterization of Magneto-Thermal Sensitive Hydrogels","authors":"Hong Sang, Jianying Hu, Erasmo Carrera, Jianke Du","doi":"10.1142/s1758825124500819","DOIUrl":"https://doi.org/10.1142/s1758825124500819","url":null,"abstract":"When in an alternating magnetic field, magneto-thermal sensitive hydrogels can absorb solvent molecules, causing the gel network to swell several times to its original size. By conducting experiments with magnetic PNIPAm hydrogels (M-PNIPAm), the parameters of the theoretical model for magneto-thermal sensitive hydrogels were experimentally determined. Subsequently, the mechanical behavior of M-PNIPAm hydrogel was studied through finite element analysis and tensile experiments. The numerical calculations based on the thermodynamic model with specific parameters showed consistency with experimental results. The comparison indicated that the proposed theory for magneto-thermal sensitive hydrogels can accurately predict the mechanical property of M-PNIPAm hydrogel, providing theoretical support for investigating large deformation of magneto-thermal sensitive hydrogels. Furthermore, we discovered that the variation of magnetic particle content significantly influence the mechanics properties of hydrogel. Our findings provide valuable insights for the research and application of magneto-thermal sensitive hydrogels.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"16 06","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147891832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 3

Mechanical Behaviors of Copolymer Elastomers: Experimental Characterization and Constitutive Modeling 共聚物弹性体的力学行为：实验表征和本构建模

3区工程技术

International Journal of Applied Mechanics Pub Date : 2024-06-29 DOI: 10.1142/s1758825124410023

Kunquan Wang, Lu Dai, Ji Lin, Ping Rao, Rui Xiao

{"title":"Mechanical Behaviors of Copolymer Elastomers: Experimental Characterization and Constitutive Modeling","authors":"Kunquan Wang, Lu Dai, Ji Lin, Ping Rao, Rui Xiao","doi":"10.1142/s1758825124410023","DOIUrl":"https://doi.org/10.1142/s1758825124410023","url":null,"abstract":"We combine experimental analysis and modeling to investigate the complex mechanical behaviors of copolymer elastomers. Experimental studies are conducted to analyze the impact of monomer ratio, strain rate, and loading mode on the response of copolymer elastomers, which reveal the distinct hyperelastic, viscoelastic, damage and self-recovery behaviors of the materials. Based on the experimental observations, we develop a finite deformation hyperelastic-viscoelastic constitutive model, which incorporates multiple discrete relaxation processes. For the hyperelastic process, an extended eight-chain model is employed. Different from the classic viscoelastic model, the strain hardening and damage/recovery mechanisms are also included in the relaxation processes. The model successfully describes the complex mechanical responses observed in elastomers, including quasi-static loading, strain rate effects, and stress relaxation phenomena. Additionally, the model captures the behavior of elastomers during loading-unloading cycles in a reasonable manner. The work offers an efficient theoretical tool for the design and practical application of elastomers.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"16 06","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147900400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 7

Highly Stretchable and Adhesive Soft Vitrimers Based on N →B Coordination Structure 基于N→B配位结构的高拉伸和粘接软玻璃体

3区工程技术

International Journal of Applied Mechanics Pub Date : 2024-06-29 DOI: 10.1142/s1758825124500832

Shahao Li, Yang Chen, Xiaofeng Li, Hongyan Yang, Mengze Lu, Wei Zhang, Chuanxia Jiang, Shuming Cui, Junkai Liang, Liqun Tang, Taolin Sun

{"title":"Highly Stretchable and Adhesive Soft Vitrimers Based on N →B Coordination Structure","authors":"Shahao Li, Yang Chen, Xiaofeng Li, Hongyan Yang, Mengze Lu, Wei Zhang, Chuanxia Jiang, Shuming Cui, Junkai Liang, Liqun Tang, Taolin Sun","doi":"10.1142/s1758825124500832","DOIUrl":"https://doi.org/10.1142/s1758825124500832","url":null,"abstract":"Recently, vitrimers with a reversible N[Formula: see text]B coordination dynamic structure have garnered interest not only for their self-healing and reprocessable properties but also for their hydrolytic stability. Reported vitrimers with N[Formula: see text]B internal coordination dynamic structure were excessively rigid, limiting their stretchability and toughness. This study synthesized a cross-linking agent (DNCB) with a cyclic nitrogen-boron coordination structure. This agent was then used in copolymerization with n-butyl acrylate (BA) and 4-vinylphenylboronic acid (BOH) to create soft vitrimers. By systematically tuning the composition, soft vitrimers exhibit water resistance along with high viscoelasticity, stretchability, toughness, and adhesive properties against various substrates. The observed mechanical behavior is attributed to the rapid relaxation of N[Formula: see text]B coordination bonds and slow relaxation of B-O bonds in boroxine within the polymer network. It is anticipated that these soft vitrimers will be applied in adhesives, flexible electronics, and soft robotics due to their favorable properties.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"16 06","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147919583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 1

Deep Learning Accelerated Design of Bézier Curve-Based Cellular Metamaterials with Target Properties 基于贝塞尔曲线的具有目标特性的蜂窝超材料的深度学习加速设计

IF 3.5 3区工程技术

International Journal of Applied Mechanics Pub Date : 2024-05-30 DOI: 10.1142/s1758825124500674

Chuang Liu, Heng-An Wu

{"title":"Deep Learning Accelerated Design of Bézier Curve-Based Cellular Metamaterials with Target Properties","authors":"Chuang Liu, Heng-An Wu","doi":"10.1142/s1758825124500674","DOIUrl":"https://doi.org/10.1142/s1758825124500674","url":null,"abstract":"Machine learning has sparked significant interest in the realm of designing mechanical metamaterials. These metamaterials derive their unique properties from microstructures rather than the constituent materials themselves. In this context, we introduce a novel data-driven approach for the design of an orthotropic cellular metamaterials with specific target properties. Our methodology leverages a Bézier curve framework with strategically placed control points. A machine learning model harnesses the positions of these control points to achieve the desired material properties. This process consists of two main steps. Initially, we establish a forward model capable of predicting material properties based on given designs. Then, we construct an inverse model that takes material properties as inputs and produces corresponding design parameters as outputs. Our results demonstrate that the dataset generated using the Bézier curve-based strategy shows a wide range of elastic distributions. Describing the geometry in terms of design parameters, rather than pixel-based figures, enhances the training efficiency of the networks. The dual-network training approach helps avoid contradictions where specific elastic properties may correspond to various geometric designs. We verify the prediction accuracy of the inverse model concerning elastic properties and relative density. The presented approach holds promise for accelerating the design of cellular metamaterials with desired properties.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"81 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Multi-Time-Step Parallel Computing Method based on Overlapping Particles for DEM 基于重叠粒子的 DEM 多时间步并行计算方法

IF 3.5 3区工程技术

International Journal of Applied Mechanics Pub Date : 2024-05-29 DOI: 10.1142/s1758825124500662

Tong Li, Nian Qi, Peizhong Yang, Xianlong Jin

{"title":"A Multi-Time-Step Parallel Computing Method based on Overlapping Particles for DEM","authors":"Tong Li, Nian Qi, Peizhong Yang, Xianlong Jin","doi":"10.1142/s1758825124500662","DOIUrl":"https://doi.org/10.1142/s1758825124500662","url":null,"abstract":"The application of the discrete element method (DEM) to continuous medium problems is becoming increasingly widespread. In this work, a parallel computing method with multiple time steps based on overlapping particles is proposed. The domain decomposition method (DDM) with overlapping particles method is used to increase the speed up and shorten the computation time and meet the consistency requirements during data transmission. The multi-time-step method (MTSM) is adopted to tackle the matching of asynchronous step boundary. Data are exchanged at the boundaries in each subdomain with a message passing interface (MPI). The computational efficiency of different step ratios in both serial and parallel computing is studied respectively. Numerical examples show that the DEM can effectively handle large structure deformation problems, and provides a shorter calculation time than that of the finite element method (FEM). The DEM with multiple time steps in different subdomains effectively reduces the computation time than that with a single time step in the entire domain. Under fixed step ratio conditions, using parallel computing can save more time than serial computing. This work develops ideas for expanding the application of DEM for large engineering problems.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"43 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141198043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Frictionless Normal Contact Model for Flattening Elastoplastic Single Asperity Considering Yield Plateau and Strain Hardening 考虑屈服台阶和应变硬化的扁平弹塑性单面无摩擦法向接触模型

IF 3.5 3区工程技术

International Journal of Applied Mechanics Pub Date : 2024-05-27 DOI: 10.1142/s1758825124500650

Juncheng Luo, Jianhua Liu, Huanxiong Xia, Xiaohui Ao, Jian Zhang, Xuerui Zhang, Hui Zhang, Hao Huang, Xin Liu

{"title":"A Frictionless Normal Contact Model for Flattening Elastoplastic Single Asperity Considering Yield Plateau and Strain Hardening","authors":"Juncheng Luo, Jianhua Liu, Huanxiong Xia, Xiaohui Ao, Jian Zhang, Xuerui Zhang, Hui Zhang, Hao Huang, Xin Liu","doi":"10.1142/s1758825124500650","DOIUrl":"https://doi.org/10.1142/s1758825124500650","url":null,"abstract":"Contact between solids is a ubiquitous phenomenon in engineering and an enduring topic in tribology. However, material yield plateau and strain hardening are common in ductile metals but rarely considered in contact mechanics. This work develops a three-phase constitutive model that accurately describes the elastic and plastic behaviors considering both yield plateau and strain hardening, and then constructs a finite element model for the contact of a rigid flat and a corresponding elastoplastic hemisphere. The Taguchi method is employed to conduct numerical simulations of material parameters for finding generalized empirical formulations of dimensionless contact load and area versus dimensionless contact interference in the range of <math altimg=\"eq-00001.gif\" display=\"inline\"><msup><mrow><mi>ω</mi></mrow><mrow><mo stretchy=\"false\">∗</mo></mrow></msup><mo>≤</mo><mn>1</mn><mn>2</mn><mn>0</mn></math>. The presented empirical formulations demonstrate good accuracy verified with KE, JG, and Ghaednia’s models. This work fills the gap that the yield plateau has not ever been explored in contact mechanics and provides a basic model for describing the contact behavior of engineering rough surfaces for ductile metal.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"53 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141197092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Application of Convolutional Networks for Localization and Prediction of Scalar Parameters of Fractured Geological Inclusion 卷积网络在断裂地质包裹体标量参数定位和预测中的应用

IF 3.5 3区工程技术

International Journal of Applied Mechanics Pub Date : 2024-05-21 DOI: 10.1142/s1758825124500649

Vasily Golubev, Mikhail Anisimov

引用次数: 0

An Indentation Method for Determining the Elastic Modulus, Hardness and Film Thickness of a Tri-Layer Materials 测定三层材料弹性模量、硬度和膜厚的压痕法

IF 3.5 3区工程技术

International Journal of Applied Mechanics Pub Date : 2024-03-14 DOI: 10.1142/s1758825124500467

Siwei Zhao, Yuanxin Li, Jianwei Zhang, Bingbing Wang, Minghao Zhao, Chunsheng Lu

{"title":"An Indentation Method for Determining the Elastic Modulus, Hardness and Film Thickness of a Tri-Layer Materials","authors":"Siwei Zhao, Yuanxin Li, Jianwei Zhang, Bingbing Wang, Minghao Zhao, Chunsheng Lu","doi":"10.1142/s1758825124500467","DOIUrl":"https://doi.org/10.1142/s1758825124500467","url":null,"abstract":"Multilayer materials have found extensive application within the aerospace industry due to their notable mechanical attributes. The operational longevity and dependability of such materials are substantially influenced by the performance characteristics of individual layers. In this study, an indentation method was established for employing a weighting function to simultaneously characterize the elastic modulus, hardness and film thickness of tri-layer materials. The results of numerical simulations indicate that incorporating the substrate effect in such an approach allows for precise assessment of the mechanical properties of tri-layer materials with diverse thicknesses. To validate the method, nanoindentation tests were performed using two tri-layer materials (i.e., Al/Cu/304SS and Cu/Al/304SS). Further, according to numerical and experimental data, the proposed model could be reduced to evaluate the mechanical properties of a bilayer material. The present findings demonstrate the effectiveness and applicability of the proposed indentation method in characterizing multilayer materials, facilitating reliable assessment in practical applications.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"100 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140150833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Semi-Analytical Solution for the Stress Field and Stress Intensity Factor of Hole-Edge Cracks Using Improved Muskhelishvili Method 使用改进的 Muskhelishvili 方法对孔缘裂缝的应力场和应力集中因子进行半解析求解

IF 3.5 3区工程技术

International Journal of Applied Mechanics Pub Date : 2024-03-11 DOI: 10.1142/s1758825124500443

Haibiao Gao, Yixiao Qin, Linhao Wang

{"title":"A Semi-Analytical Solution for the Stress Field and Stress Intensity Factor of Hole-Edge Cracks Using Improved Muskhelishvili Method","authors":"Haibiao Gao, Yixiao Qin, Linhao Wang","doi":"10.1142/s1758825124500443","DOIUrl":"https://doi.org/10.1142/s1758825124500443","url":null,"abstract":"A semi-analytical solution is provided to obtain the stress intensity factors (SIFs) of hole-edge cracks with different configurations and the stress fields along the crack propagation direction in an infinite isotropic plane. The complicated solution procedure while using the Muskhelishvili method is improved by expanding an irrational mapping function into an approximate rational function so that singular integral equations could be converted to linear equations. The proposed method used to obtain the SIFs of symmetrical cracks emanating from circular or elliptical holes and a single crack emanating from a circular hole is compared with other methods in the literature. The results show that this method is universal and accurate for hole-edge cracks. In addition, the effects of the lengths of the asymmetrical cracks and the ratio of the semi-axes of the elliptical hole (<math altimg=\"eq-00001.gif\" display=\"inline\" overflow=\"scroll\"><mi>a</mi></math>/<math altimg=\"eq-00002.gif\" display=\"inline\" overflow=\"scroll\"><mi>b</mi><mo stretchy=\"false\">)</mo></math> on the SIFs are studied, which have not been previously reported.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"18 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140150832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Thermal–Elastic–Magnetic Coupling-Induced Rubbing Behaviors of a Bladed Thin-Walled Rotor with Distributed Magnetic Actuators 带有分布式磁性致动器的薄壁叶片转子的热弹性磁耦合摩擦行为

IF 3.5 3区工程技术

International Journal of Applied Mechanics Pub Date : 2024-03-07 DOI: 10.1142/s1758825124500455

Haijiang Kou, Yang Cao, Heow Pueh Lee, Yuxiang Shi, Jiaojiao Du

{"title":"Thermal–Elastic–Magnetic Coupling-Induced Rubbing Behaviors of a Bladed Thin-Walled Rotor with Distributed Magnetic Actuators","authors":"Haijiang Kou, Yang Cao, Heow Pueh Lee, Yuxiang Shi, Jiaojiao Du","doi":"10.1142/s1758825124500455","DOIUrl":"https://doi.org/10.1142/s1758825124500455","url":null,"abstract":"A bladed thin-walled rotor with magnetic bearings in gas turbines has minimal wear to improve the service life. Especially, the rotor system can actively suppress vibrations. Yet, thermal–elastic–magnetic coupling-induced rubbing features of a bladed thin-walled rotor with magnetic bearings are not clear, and blade rubbing behaviors induced by high temperatures always occur in this kind of rotor. This paper establishes a new bladed thin-walled rotor model with distributed electromagnetic actuators to reduce thermoelastic vibrations and develops a solution approach for obtaining the thermal–elastic–magnetic coupling-induced rubbing characteristics of the rotor. The solution approach is verified, and the effectiveness of the distributed electromagnetic actuator model is demonstrated. The magnetic supports require two differential-control actuators at each position to generate the electromagnetic force, due to irregular concave–convex deformations of the rotor. Thereafter blade rub behaviors for the thin-walled rotor system are revealed. Uniform and smaller thermal deformations of the rotor system with the present actuator model avoid tip rub due to preventing thermal energy concentration. With the proper bearing capacity of a single actuator, an adequate number of actuators are required to ensure stability. The proposed theoretical prototype of the bladed thin-walled rotor with distributed electromagnetic actuators prevents blade rubbing caused by high temperatures. The provided solution approach can evaluate the vibration characteristics of a rotating thin-walled rotor with magnetic supports in the high-temperature environment.","PeriodicalId":49186,"journal":{"name":"International Journal of Applied Mechanics","volume":"124 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140150726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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