检索结果-内蒙古大学图书馆

Reshapeable,rehealable and recyclable sensor fabricated by direct ink writing of conductive composites based on covalent adaptable network polymers

引用

International Journal of Extreme Manufacturing 2022年第1期4卷 94-107页

作者： Xu He Yuchen Lin Yuchen Ding Arif M Abdullah Zepeng Lei Yubo Han Xiaojuan Shi Wei Zhang Kai Yu Department of Mechanical Engineering University of Colorado DenverDenverCO 80217United States of America Department of Chemistry University of Colorado BoulderBoulderCO 80309United States of America School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044People’s Republic of China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080People’s Republic of China

Covalent adaptable network(CAN)polymers doped with conductive nanoparticles are an ideal candidate to create reshapeable,rehealable,and fully recyclable *** the other hand,3D printing as a deterministic manufacturing method has a significant potential to fabricate electronics with low cost and high design *** this paper,we incorporate a conductive composite consisting of polyimine CAN and multi-wall carbon nanotubes into direct-ink-writing 3D printing to create polymeric sensors with outstanding reshaping,repairing,and recycling *** developed printable ink exhibits good printability,conductivity,and *** conductivity of printed polyimine composites is investigated at different temperatures and deformation strain *** shape-reforming and Joule heating-induced interfacial welding effects are demonstrated and ***,a temperature sensor is 3D printed with defined patterns of conductive pathways,which can be easily mounted onto 3D surfaces,repaired after damage,and recycled using *** sensing capability of printed sensors is maintained after the repairing and ***,the 3D printed reshapeable,rehealable,and recyclable sensors possess complex geometry and extend service life,which assist in the development of polymer-based electronics toward broad and sustainable applications.

关键词： bond exchange reactions polyimine covalent adaptable networks direct ink writing rehealable electronics recyclability

来源：评论

学校读者我要写书评

暂无评论

Superbroad-band actively tunable acoustic metamaterials driven from poly(ethylene terephthalate)/carbon nanotube nanocomposite membranes

引用

Nano Research 2021年第1期14卷 100-107页

作者： Ying Li Wen Ning Qingyu Peng Minglong Yang Dongyi Lei Siyao Guo Peng Liu Kaili Jiang Xiaodong He Yibin Li School of Civil Engineering Qingdao University of TechnologyQingdao 266033China National Key Laboratory of Science and Technology for National Defence on Advanced Composites in special Environments Harbin Institute of TechnologyHarbin 150080China State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics&Tsinghua-Foxconn Nanotechnology Research CenterTsinghua University&Collaborative Innovation Center of Quantum MatterBeijing 100084China Shenzhen STRONG Advanced Materials Institute Ltd.Corp Shenzhen 518000China

Actively tunable acoustic metamaterials have attracted ever increasing ***,their tunable frequency range is quite narrow(tens of Hz)even under ultrahigh applied voltage(about 1,000 V).Here,we report a superbroad-band actively tunable acoustic metamaterials with the bandwidth over 400 Hz under a low *** the actively tunable acoustic metamaterials,the acoustic membrane is a laminated nanocomposite consisting of a poly(ethylene terephthalate)(PET)and super-aligned carbon nanotube(CNT)drawn from CN T forest *** laminated nanocomposite membrane exhibits adjustable acoustic properties,whose modulus can be adjusted by applying external electric *** maximum frequency bandwidth of PET/CN T nanocomposite membrane reaches 419 Hz when applying an external DC voltage of 60 *** actively tunable acoustic metamaterials with superbroad-band and lightweight show very promising foreground in noise reduction applications.

关键词： poly(ethylene terephthalate)/carbon nanotube nanocomposite membrane active control acoustic metamaterials noise reduction

来源：评论

学校读者我要写书评

暂无评论

A Novel Model for Buckling of Composite Shell: Ring Stiffened Shell and Stiffened Shell with Cutout Under Hydrostatic Pressure

SSRN

引用

SSRN 2023年

作者： Zhao, Chengwei Wu, Linzhi Zhao, Yang Pan, Shidong Zhou, Zhengong Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150001 China

Aiming at the buckling problem of ring stiffened shells and shells with stiffened cutout fabricated by the filament winding process under hydrostatic pressure, a new form of equilibrium equations is given in this paper based on the high-order shear deformation theory (HSDT), combined with Messager's model of the geometrical imperfection, a theoretical model is proposed. The model contains both the ring stiffened shell model (RSSM) and the stiffened shell with cutout model (SSCM), in which the change in the thickness of the shell is described in the form of Fourier series to be taken into account in the stiffness matrix. Bringing the model into the solution procedure of critical buckling pressure, the results were compared with the results of the traditional stiffened cylindrical shell (SCS) model. The results showed that in the case of the shell stiffened by a ring stiffener in the middle, the error can be reduced by 71.08% to 81.22% compared with the SCS model. The results show that the small stiffened cutouts of the thin shell and the large stiffened cutouts of the moderately thick shell have little effect, while ring stiffener in the middle has a greater one, on the critical buckling pressure. © 2023, The Authors. All rights reserved.

关键词： Buckling

来源：评论

学校读者我要写书评

暂无评论

单原子在铝合金中的扩散迁移行为:可解释机器学习加速第一原理计算方法

引用

science China Materials 2024年第4期67卷 1140-1149页

作者：黄敬涛薛景腾李明伟程源来忠红胡津周飞曲囡刘勇朱景川 School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in SpecialEnvironments Harbin Institute of TechnologyHarbin 150001 China Center for Analysis Measurement and ComputingHarbin Institute of TechnologyHarbin 150001China State Key Laboratory for Environment-friendly Energy Materials School of Materials Science and EngineringSouthwest University of Science and TechnologyMianyang 621010China

本文采用机器学习加速第一原理计算的方法,研究了铝基体中单原子的扩散迁移行为.建立铝基体中三十多种单原子扩散迁移行为的小样本数据集,以原子半径、离子半径和第一电离能等固有参数作为输入特征值,合金原子与空位之间的相互作用能以... 详细信息

本文采用机器学习加速第一原理计算的方法,研究了铝基体中单原子的扩散迁移行为.建立铝基体中三十多种单原子扩散迁移行为的小样本数据集,以原子半径、离子半径和第一电离能等固有参数作为输入特征值,合金原子与空位之间的相互作用能以及合金原子在铝基体中的扩散势垒作为输出参数.通过相关性分析初步确定描述符与预测目标之间的关系,并利用递归特征消除法确定不同目标的输入特征和描述符数量.通过交叉验证证明所选模型的先进性,并进行微调以优化其性能.为了验证其效率和准确性,CatBoost模型经过了传统算法的严格测试.利用训练有素的模型预测周期表中其他单原子在铝基体中的扩散迁移行为.机器学习加速第一原理计算的结果可为进一步开发新型铝合金提供理论依据.

关键词：机器学习扩散迁移交叉验证输出参数单原子第一原理计算原子半径小样本数据

来源：评论

学校读者我要写书评

暂无评论

Gradient C f /ZrB 2 -SiC composites integrating low-density, good mechanical properties and heat-resistant

引用

Journal of Materials science & technology 2026年 242卷 156-165页

作者： Qiang Gao Ping Hu Yuxuan Xia Yuan Cheng Guangdong Zhao Jiaxin Feng Zibin Chen Xinghong Zhang National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150080 China Beijing Power Machinery Institute The Third Academy of State-owned Aerospace Giant China Aerospace Science & Industry Corporation (CASIC) Beijing 100074 China School of Chemistry and Materials Science Heilongjiang University Harbin 150080 China

Ultra-high temperature ceramic composites (UHTCCs) with low density and exceptional heat resistance are essential for hypersonic vehicle applications, enabling increased payload capacity and higher Mach numbers. However, developing a fabrication process that enables UHTCCs with both lightweight and superior thermal protection performance is still a challenge. To tackle this problem, in this study, a combinatorial process of vibration-assisted slurry impregnation and polymer infiltration pyrolysis was developed to fabricate gradient lightweight C f /ZrB 2 -SiC composites, consisting of continuous carbon fiber fabric, ZrB 2 -SiC and a carbon aerogels (CAs) layer. The resulting composites exhibit a low density of (0.62–0.96 g cm −3 ) but excellent oxidation and ablation resistance, which can withstand ultrahigh temperatures between 2100 °C and 2500 °C. The porous C f /CAs layer, with a density of 0.38 g cm −3 and specific bending and compressive strengths of 43.47 MPa/(g cm −3 ) and 15.53 MPa/(g cm −3 ), respectively, provides both structural integrity and lightweight properties to the C f /ZrB 2 -SiC composite. Furthermore, the density of the composites can be precisely tailored by adjusting the thickness of the C f /ZrB 2 -SiC layer, allowing for customized fabrication to meet diverse service environment requirements. This flexibility highlights the adaptability of the combined processing techniques. The unique combination of controllable low-density properties and exceptional oxidation and ablation resistance endows gradient lightweight C f /ZrB 2 -SiC composites are promising as lightweight, ultra-high temperature thermal protection systems for hypersonic vehicle applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

4D printing of personalized shape memory polymer vascular stents with negative Poisson’s ratio structure:A preliminary study

引用

science China(Technological sciences) 2020年第4期63卷 578-588页

作者： LIN Cheng ZHANG LiJin LIU YanJu LIU LiWu LENG JinSong Department of Astronautic Science and Mechanics Harbin Institute of Technology(HIT)Harbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology(HIT)Harbin 150080China

Four-dimensional(4D)printing,integrates transformation information into three-dimensional(3D)-printed structures,which means that 3D-printed structures are able to change their shapes,properties,or functionalities over ***,two types of shape memory personalized vascular stents with negative Poisson’s ratio structure are developed via 4D *** genetic algorithm is used to optimize the *** compression tests,radial compression tests and three-point bending tests are carried out to study the mechanical properties of the *** addition,fluid-structure interaction and stress distribution during the shape recovery process are investigated based on finite element *** shape memory behaviors of the stents are excellent and in vitro feasibility tests demonstrate that the stents can expand the simulated narrow blood vessel ***,4D printed shape memory stents with negative Poisson’s ratio structure are highly promising for the treatment of vascular stenosis.

关键词： shape memory polymer 4D printing biodegradable vascular stents finite element analysis negative Poisson's ratio

来源：评论

学校读者我要写书评

暂无评论

Enhanced Ablative Performance of Zrb2 Bioinspired Fiber-Aggregated Ceramics with a Design of Dual-Interface Structure

SSRN

引用

SSRN 2023年

作者： Duan, Xianghan Wei, Chuncheng Li, Shuang Meng, Fantao Chen, Dehui Zhang, Xinghong Han, Qingyun School of Material Science and Engineering Shandong University of Technology Zibo255049 China National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

ZrB2-SiC/BN/ZrB2-SiC dual-interface fiber-aggregated ceramic (DFC) was fabricated by wet-extruding and hot-pressing, then the ablation resistance of the ceramics was investigated by plasma flame with heat flux of 8.2 MW/m2 for 120 s. After ablation, the DFC remained an intact structure, and had the mass and linear ablation rates of -0.263 mg·s-1 and -0.171 μm·s-1, respectively. Compared with the catastrophic failure in mono-interface fiber-aggregated ceramics, DFC presented a typical non-ablative behavior during ablation. The enhanced ablation resistance of DFC was attributed to the fast heat transfer channel and continuous dense barrier of SiO2-ZrO2 with low oxygen permeability brought by the dual-interface. © 2023, The Authors. All rights reserved.

关键词： Thermal conductivity

来源：评论

学校读者我要写书评

暂无评论

Cold-Sintered Zrw2o8/Sio2/Sio2f Wave-Transparent composites: Design and Fabrication of Interfacial Anti-Debonding Structures Based on Polymeric Films

SSRN

引用

SSRN 2023年

作者： Wang, Xiaofei Yang, Xuan Ding, Yongwen Zhang, Hui Li, Jinping Meng, Songhe National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150080 China

The interfacial debonding effect on composites limits their wide application in aerospace. This work utilized the unique water-retention properties of hyaluronic acid by adding it to the sintered liquid phase to form polymeric films. A polymeric film wrapped extended sintering time strategy was adopted to synthesize the interface structure with anti-debonding properties. This interface bonding structure enhances the sintering densification of ZrW2O8/SiO2/SiO2f composites and effectively improves operational accuracy by providing creep resistance. Furthermore, the interface bonding structure reduces the composites' interfacial polarization and reflection loss, enhancing wave-transparent properties in the 2–18 GHz frequency range. Simultaneously, the composites achieve a controllable coefficient of thermal expansion (CTE) by regulating the liquid phase content and reach near-zero CTE (-0.246 × 10-6 °C-1 [30–300 °C]). Finally, the connection between the thermodynamics and sintering densification of composites was revealed by finite element analysis, and it was deduced that increasing sintering densification is beneficial in reducing the thermal stresses and strains inside the composites. This approach effectively solves the interface debonding problem of composites and provides a unique route to design composites. © 2023, The Authors. All rights reserved.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

An Insight into the Low-Velocity Impact Behavior and Failure Mechanisms of Cfrp/Al Bonded Structures

SSRN

引用

SSRN 2023年

作者： Hu, Chunxing Xu, Zhonghai Liu, Xiangjun Cai, Chaocan Zou, Xiaocan He, Xiaodong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Shenzhen STRONG Advanced Materials Research Institute Co. Ltd Shenzhen518000 China

Experimental and numerical methods are used to investigate the effects of different impact surfaces and energies on the mechanical properties and failure behavior of CFRP/Al adhesively bonded structures. To predict the damage initiation and propagation of CFRP laminates, interlaminar and adhesive layer, and aluminum alloy plates, the integrated finite element model (FEM) containing both low-velocity impact (LVI) and axial tensile after impact (TAI) processes is developed by combining continuum damage mechanics (CDM) model, cohesive zone model (CZM), and Johnson-Cook (JC) model. Additionally, LVI and TAI tests have been performed with aluminum alloy 5182 (AA5182) and CFRP laminate as impact surfaces, which verify the effectiveness of the proposed integrated FEM. The results indicate that AA5182, as the impact surface, produces greater impact damage (maximum crater depth (MCD) and opening width (OW)) in the center of the overlap region in comparison with the CFRP. The residual bearing capacity of the joints is the result of the competition between impact behavior and mechanical interlocking. The tensile strength, stiffness, and failure displacement of the joints decrease with the increase of impact energy. The failure modes of the joints include annular and circular cohesive failure of the adhesive layer in the impact region, interface failure, cohesive failure and peeling failure in the non-impact region, delamination damage, and fiber pullout and matrix cracking of the CFRP laminate. © 2023, The Authors. All rights reserved.

关键词： Aluminum alloys

来源：评论

学校读者我要写书评

暂无评论

Multi-Scale Modelling And Micromechanical Properties Of Semi-Crystalline Polymers

引用

Procedia Structural Integrity 2024年 52卷 63-71页

作者： Chenxu Jiang Jia Zhou Peng Jiang Changqing Miao National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of Technology Harbin 150001 China School of Water Conservancy & Civil Engineering Northeast Agricultural University Harbin 150006 China

This work proposed multi-scale modelling to predict the micromechanical properties of semi-crystalline polymers. Semi-crystalline polymers are usually spherulitic crystal structure, which is, however, not completely radially symmetric. In the initial stage of spherulite growth, its structure is manifested as multilayer wafers with a certain orientation namely sheaf structure. The size and orientation of sheaf structure are affected by various processing parameters. Previous research considered spherulite as completely radially symmetric structures, ignoring the effects of structures anisotropy on mechanical properties. In this work, the microstructure of single spherulite was first modelled with different initial orientations. The crystal plasticity constitutive model together with the Arruda-Boyce model was used to describe the micromechanical behaviors of the crystalline lamellae and amorphous lamellae, respectively. Based on the deformation behaviors of single spherulite, the Voronoi tessellation was then used to characterize the multi-spherulites, the evolution of inhomogeneous plastic deformation and inter-lamellae deformation was observed under tension. Achieving the cross-scale analysis from micro-modeling to meso-modeling. The results shown by this work improve the understanding of the micromechanical properties of semi-crystalline polymers, which, in turn, provides theoretical guides to improve their fracture resistance in manufacturing.

关键词： Spherulite Microstructure Micro-mechanics Semi-crystalline polymers

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：