Smart Materials and Structures最新文献_第6页

Electromechanical response of multilayer graphene sheet/polypropylene nanocomposites and its relationship with the graphene sheet physicochemical properties 多层石墨烯薄片/聚丙烯纳米复合材料的机电响应及其与石墨烯薄片理化特性的关系

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-08-29 DOI: 10.1088/1361-665x/ad70e5

C Medina, H Canché, A I Oliva-Avilés, F Avilés

{"title":"Electromechanical response of multilayer graphene sheet/polypropylene nanocomposites and its relationship with the graphene sheet physicochemical properties","authors":"C Medina, H Canché, A I Oliva-Avilés, F Avilés","doi":"10.1088/1361-665x/ad70e5","DOIUrl":"https://doi.org/10.1088/1361-665x/ad70e5","url":null,"abstract":"The mechanical, electrical, and piezoresistive responses of multilayer graphene sheet (GS)/polypropylene (PP) nanocomposites are investigated using four GSs of distinctive physicochemical properties. It is found that the morphology of the interconnected network of GS agglomerates at the mesoscale governs the mechanical, electrical, and electro-mechanical (piezoresistive) properties of the PP nanocomposites. The morphology of the mesoscale network of electroconductive fillers governs the effective properties of the nanocomposite. This network morphology strongly depends on the GS lateral size, dispersion, agglomeration, and, to a lesser extent, the specific surface area of the GSs. Within the range of lateral sizes investigated herein (1–21 <italic toggle=\"yes\">μ</italic>m), larger GSs yields nanocomposites with higher electrical conductivity. On the other hand, GSs of moderate lateral size (∼6.5 <italic toggle=\"yes\">μ</italic>m) and specific surface area of ∼141 m2 g−1 render GS/PP nanocomposites with a more dispersed and more sparsely interconnected network. This better dispersed network with agglomerates of smaller dimensions is concomitant with improved stiffness and strength, and higher gauge factors (∼18.2) for this GS/PP nanocomposites. Excellent capabilities for detection of human motion were proved for these nanocomposites.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"39 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","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 motion analysis of soft robotic arm with pneumatic-network structure 气动网络结构软机械臂的设计与运动分析

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-08-29 DOI: 10.1088/1361-665x/ad7002

Yinlong Zhu, Tian Wang, Weizhuang Gong, Kai Feng, Xu Wang, Shuang Xi

{"title":"Design and motion analysis of soft robotic arm with pneumatic-network structure","authors":"Yinlong Zhu, Tian Wang, Weizhuang Gong, Kai Feng, Xu Wang, Shuang Xi","doi":"10.1088/1361-665x/ad7002","DOIUrl":"https://doi.org/10.1088/1361-665x/ad7002","url":null,"abstract":"Soft robotic arms have been widely explored in recent years because of their excellent flexibility and infinite degrees of freedom which distinguishes them form traditional rigid robots. This paper focuses on the design, fabrication and kinematic analysis of a new modular soft robotic arm featuring multiple segments, each one with three degrees of freedom. In contrast to most research, this paper utilizes soft pneu-net structure instead of fiber-reinforced structure, thereby preventing large local strains due to membrane pressurized against a fiber reinforcement. We employed finite element method and orthogonal experiment were to ascertain the optimal structural parameters. Furthermore, we present the kinematic model of the soft arm by the parameterization of the Denavit–Hartenberg convention under the basis of constant curvature assumption. Finally, the experimental evaluation of the soft robotic arm including bending angle, elongation, deflection and flexibility test were carried out. The experimental data, particularly concerning the bending angle and spatial position of both single modular and two-modular soft arm agree well with the finite element method simulation. Additionally, we performed both grasping and obstacle-avoidance grasping tests for dual modular soft robotic. The results demonstrate that the soft robotic arm exhibits superior performance and highlights its potential for various applications.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"11 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of pre-magnetized magnetorheological elastomer for bidirectionally variable stiffness applications 开发用于双向可变刚度应用的预磁化磁流变弹性体

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-08-29 DOI: 10.1088/1361-665x/ad7003

Choonghan Lee, Woosoon Yim

{"title":"Development of pre-magnetized magnetorheological elastomer for bidirectionally variable stiffness applications","authors":"Choonghan Lee, Woosoon Yim","doi":"10.1088/1361-665x/ad7003","DOIUrl":"https://doi.org/10.1088/1361-665x/ad7003","url":null,"abstract":"Magnetorheological elastomers (MREs) are materials that leverage magnetic forces among ferromagnetic particles to induce variable stiffness and damping under external magnetic fields. However, conventional MREs have limitations in achieving reduced stiffness when exposed to an external magnetic field. In response to the need for rapid and bidirectional changes in stiffness, this research proposes a novel approach—pre-magnetized MREs—using permanently magnetized ferromagnetic particles instead of an external permanent magnet for magnetic bias. The pre-magnetized MRE, fabricated with silica-coated neodymium alloy particles and silicone elastomer, undergoes a comprehensive investigation of design parameters, including silicone resin selection, particle thickness, size, and weight ratio. The study explores the directional effects of pre-magnetization through simulations, considering forces among magnetized particles and the hyperelasticity of the elastomer. Experimental investigations involve measuring shear moduli for different shear strains under varying magnetization directions. The results highlight the impact of resin type, particle size, and weight ratio on the magnetorheological (MR) effect. Additionally, an application testbed is developed to assess bi-directional changes in stiffness for various core materials. The study reveals a correlation between MR effect/response time and the magnetic permeabilities of core materials, along with the attraction and repulsion forces between the core and magnetized particles. Observations indicate that the MR effect for different core materials ranges from 0.08% to 0.25%, with response times measured at 40 and 46 ms for forward and reverse currents, respectively. The findings contribute valuable insights into optimizing the design and performance of pre-magnetized MREs for enhanced bi-directional stiffness control in engineering applications.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"94 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Double-layer metasurface for blocking the fundamental SH wave 用于阻挡 SH 基波的双层元表面

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-08-29 DOI: 10.1088/1361-665x/ad7215

Hongchen Miao, Xi Cao, Mingtao Fu

{"title":"Double-layer metasurface for blocking the fundamental SH wave","authors":"Hongchen Miao, Xi Cao, Mingtao Fu","doi":"10.1088/1361-665x/ad7215","DOIUrl":"https://doi.org/10.1088/1361-665x/ad7215","url":null,"abstract":"This work introduces a double-layer metasurface to isolate the fundamental shear horizontal wave (SH0 wave). The metasurface is designed to split the SH0 wave source into two parts and then manipulate the two waves to be out of phase and have equal amplitude upon reaching the end of the metasurface. This results in interference cancellation, effectively blocking the propagation of SH0 waves into the protected zone. Firstly, the metasurface is designed theoretically, utilizing rectangular strips to constitute the substructure. Subsequently, finite element simulations are conducted to verify the correctness of the theoretical design. Finally, the metasurface is fabricated using 3D printing, and its performance is evaluated through experiments. The results indicate that the metasurface can function as a cage for SH0 waves, trapping different types of SH0 waves located at any position within the cage. Furthermore, when the source of SH0 waves is positioned outside the cage, the metasurface can effectively impede their propagation into the interior region of the cage. The proposed double-layer metasurface provides a simple approach to blocking SH0 waves, which may have potential applications in practical engineering.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"136 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on active-passive integrated vibration isolator based on metal rubber and piezoelectric actuator 基于金属橡胶和压电致动器的主被动一体化隔振器研究

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-08-27 DOI: 10.1088/1361-665x/ad6ed0

Jiaxi Jin, Xuan Sun, Yuechen Liu, Zhaobo Chen

引用次数: 0

A novel linear piezoelectric inchworm actuator based on a ratchet mechanism 基于棘轮机构的新型线性压电尺蠖致动器

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-08-27 DOI: 10.1088/1361-665x/ad6f82

Yangkun Zhang, Mengze Lao, Yang Yang

{"title":"A novel linear piezoelectric inchworm actuator based on a ratchet mechanism","authors":"Yangkun Zhang, Mengze Lao, Yang Yang","doi":"10.1088/1361-665x/ad6f82","DOIUrl":"https://doi.org/10.1088/1361-665x/ad6f82","url":null,"abstract":"A new working principle of inchworm actuator, which converts vibrations of a single piezo actuator into unidirectional step movement of a mover via a ratchet mechanism, was proposed. The proposed working principle has the following priorities: (1) it requires only one piezoelectric actuator which greatly simplifies its driving signals and driving circuits; (2) it can achieve a large driving speed with little compromise of a large force output while maintaining a high positioning precision of piezoelectric actuator and a theoretically unlimited motion range, although it can only achieve unidirectional movement with unidirectional self-locking capability; (3) it could be open-loop controlled with no accumulated step errors. The proposed actuator was designed with compliant mechanism and an analytical model of the design was developed, validated by finite element simulations carried out in Commercial Software ANSYS and used to guide the selection of design parameters. A prototype was fabricated and tested. Experiments show that the proposed actuator achieved a speed larger than 12 mm s−1, a driving load larger than 60 N in the moving direction, a reliable open-loop controllability with no step accumulated errors even under driving load variations of 60 N, and a working range larger than 1 mm with a high positioning precision around 320 nm under closed-loop control, which validated the superiorities of the proposed actuator.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"81 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The rheological behavior of aqueous magnetic fluids over a wide range of shear rates 水基磁性流体在各种剪切速率下的流变行为

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-08-27 DOI: 10.1088/1361-665x/ad6f83

Xiaofeng Yan, Xianggang Li, Qianmei Yin, Jingjing Tong, Tao Xie

{"title":"The rheological behavior of aqueous magnetic fluids over a wide range of shear rates","authors":"Xiaofeng Yan, Xianggang Li, Qianmei Yin, Jingjing Tong, Tao Xie","doi":"10.1088/1361-665x/ad6f83","DOIUrl":"https://doi.org/10.1088/1361-665x/ad6f83","url":null,"abstract":"A rheological measurement system was constructed to investigate the rheological behavior of magnetic fluids under a wide range of shear rates, and its feasibility was verified. The system is capable of measuring a shear rate range spanning five orders of magnitude, with a maximum shear rate of 106 s−1. It was utilized to study the time required for aqueous magnetic fluids in a magnetic field to reach a steady state, taking into account the coupling effect of the flow field and magnetic field. Additionally, the time needed for the magnetic fluids to return to their initial state after demagnetization was also measured. Based on these measurements, the rheological behavior of magnetic fluids with varying concentrations and magnetic field directions was studied. Results indicate that the residence time of the magnetic fluids in the magnetic field and the de-magnetization time have almost no effect on their viscosity. When the magnetic field direction is perpendicular to the flow direction, regardless of concentration, aqueous magnetic fluids exhibit shear thinning behavior; when it is parallel to the flow direction, high-concentration aqueous magnetic fluids show shear thickening, while low-concentration ones behave as Newtonian fluids. In this study’s shear rate range, no Newtonian regions were found in either high- or low-shear rate regions.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"41 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual-mode flexible sensor based on magnetic film for wearable smart finger sleeve 基于磁性薄膜的双模柔性传感器，用于可穿戴智能指套

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-08-23 DOI: 10.1088/1361-665x/ad6ecf

Guoheng Lin, Ling Weng, Hui Zhang, Zhuolin Li, Boyang Hu, Kai Meng, Shengwang Jiang

{"title":"Dual-mode flexible sensor based on magnetic film for wearable smart finger sleeve","authors":"Guoheng Lin, Ling Weng, Hui Zhang, Zhuolin Li, Boyang Hu, Kai Meng, Shengwang Jiang","doi":"10.1088/1361-665x/ad6ecf","DOIUrl":"https://doi.org/10.1088/1361-665x/ad6ecf","url":null,"abstract":"Flexible tactile sensors are an important branch of wearable devices and have received extensive attention in areas such as human–computer interaction and health detection. However, some existing flexible wearable devices have the limitation of single detection quantity, so it is particularly important to study a multi-mode flexible tactile sensor. We designed a dual-mode tactile sensor with high sensitivity and wide measurement range. The sensor consists of a magnetic film in the top layer, a silicone elastomer in the middle layer, and a tunneling magnetoresistive element in the bottom layer. The experimental results show that the haptic sensor is capable of measuring static forces in the range of 0.05–18 N, and the sensitivity of the sensor to static forces increases and then decreases as the applied force increases. The maximum sensitivity was 396.4 mV N−1 in the range of 9–10 N. The tactile sensor was able to measure bending angle in the range of 1–60°. The bending angle sensitivity decreases as the applied bending angle increases, with a maximum sensitivity of 308.7 mV per 5° in the 0–5° range. The sensor has good dynamic performance, and after 1000 cyclic loading tests, the output voltage did not show any significant decrease, and the sensor response time and recovery time were 44 ms and 46 ms, respectively. This study lays a foundation for further research and development of various wearable devices and electronic skins.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"113 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tunable stiffness Kirigami gripper based on shape memory polymer and supercoiled polymer artificial muscle for multi-mode grasping 基于形状记忆聚合物和超卷曲聚合物人工肌肉的可调刚度桐神抓手，用于多模式抓取

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-08-22 DOI: 10.1088/1361-665x/ad6ed1

Yang Yang, Peng Wang, Jia Liu, Yili Fu, Yang Shen

{"title":"Tunable stiffness Kirigami gripper based on shape memory polymer and supercoiled polymer artificial muscle for multi-mode grasping","authors":"Yang Yang, Peng Wang, Jia Liu, Yili Fu, Yang Shen","doi":"10.1088/1361-665x/ad6ed1","DOIUrl":"https://doi.org/10.1088/1361-665x/ad6ed1","url":null,"abstract":"In this article, a tunable stiffness soft gripper based on Kirigami structure and shape memory polymer (SMP) is proposed. The Kirigami gripper uses SMP as variable stiffness element and employs Nichrome heating wires laid inside the gripper as heating element. Due to the segmented layout of the heating wires, the gripper possesses segmented stiffness modulation capability. As a result, programmable deformation trajectories are achieved, enabling multi-mode grasping functionality by adjusting its bending shape to accommodate different object contours. Using the thermally activated supercoiled polymer artificial muscle as the actuator, the gripper can achieve a silent and pumpless actuation and whole robotic system can be compact. The gripper mainly offers three different grasping modes—pinching, wrapping and hooking, to meet the requirements of complex tasks. Experimental results show that the Kirigami gripper can achieve a 13 times stiffness variation within 16 s, and each Kirigami gripper with different heating patterns exhibits different trajectories during the deformation process, capable of adapting and locking its shape to objects with different contours during grasping.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"11 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A soft bioinspired suction cup with tunable adhesion force using shape memory alloy 利用形状记忆合金制造具有可调附着力的软生物吸盘

IF 4.1 3区材料科学

Smart Materials and Structures Pub Date : 2024-08-14 DOI: 10.1088/1361-665x/ad6cbb

Weimian Zhou, Chanchan Xu, Guisong Chen, Xiaojie Wang

{"title":"A soft bioinspired suction cup with tunable adhesion force using shape memory alloy","authors":"Weimian Zhou, Chanchan Xu, Guisong Chen, Xiaojie Wang","doi":"10.1088/1361-665x/ad6cbb","DOIUrl":"https://doi.org/10.1088/1361-665x/ad6cbb","url":null,"abstract":"Suction cups has been widely utilized to grasp objects, but they typically encounter challenges with sealing failure and non-adjustable adhesion force. In this study, a bioinspired suction cup integrated with an shape memory alloy actuated module was proposed to solve these problems. The actuating performance under different input current was firstly investigated to ensure the effectiveness of the module. Then, inspired by the surface structures of the tree frog’s toe pad, the synthetic bioinspired suction cups with hexagonal microstructures at the rims were designed. The regular cup with soft and smooth rim was also fabricated for comparison study. Furthermore, the adhesion performance and surface adaptability of different two cups were studied in both dry and water conditions on substrates with various roughness levels. The results indicated that the proposed active bioinspired suction cup exhibited higher pull-off strength and better sealing on less rough substrates. The proposed bioinspired suction cup possessed the advantages of compactness and lightweight, thus demonstrating potential for integration into arrayed suction grippers.","PeriodicalId":21656,"journal":{"name":"Smart Materials and Structures","volume":"32 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142178702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0