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

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

Preface:Mechanics of soft materials and lexible structures

引用

Acta Mechanica Sinica 2021年第5期37卷 746-747页

作者： Haibao Lu Shaoxing Qu Xiqiao Feng State Key Laboratory of Science and Technology On Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080P.R.China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China Institute of Biomechanics and Medical Engineering AMLDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China

Soft materials and lexible structures have become essential and hot topic,which is expected to signiicantly promote the research and development of current mechanics,physics,chemistry and life ***,the soft materials and lexible structures have attracted enthusiastic attentions due to their great potential and practical applications in deployable structures,morphing structures,sensors,actuators,health-monitoring etc.

关键词： Mechanics structures Preface

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

Energy absorption evaluation of multiple fabrics under hypervelocity impact loading

引用

Procedia Structural Integrity 2024年 52卷 52-62页

作者： Huadong Xu Jia Zhou Xu Cao Wenxiang Liu 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 150001 China

In this work, the energy absorption capability of multiple fabrics was evaluated by hypervelocity impact (HVI) experiments. Six distinct high-performance fabrics, Aluminum (Al) mesh, and 5A06 Al plates were considered as experimental samples, and the areal density were kept constant for all shielding configuration. HVI experiments were carried out by the two-stage light gas gun capable of accelerating 3.97 mm diameter Al projectiles to 4.0 ∼ 4.2 km/s. An evaluation methodology of absorbed energy was proposed to analysis the energy absorption of multiple fabrics in HVI experiments, which based on initial velocity of projectiles, penetrated layers in fabric targets, the depth and volume of the impact crater on witness plate. It was found that UHMWPE and aramid fabric targets were not penetrated, and had a higher energy absorption capacity, exhibiting excellent shielding performance compared to other materials of the same area density.

关键词： Hypervelocity impact Space debris Multiple fabrics. Shielding performance Energy absorption

来源：评论

学校读者我要写书评

暂无评论

Light weight optimization of stratospheric airship envelope based on reliability analysis

引用

Chinese Journal of Aeronautics 2020年第10期33卷 2670-2678页

作者： Yunce ZHANG Yafei WANG Changguo WANG National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China Center for Composite Materials Harbin Institute of TechnologyHarbin 150001China

A stratospheric airship is an essential flight vehicle in the aviation *** this paper,optimal design approach of stratospheric airships is developed to optimize envelope shape considering three failure modes and multidisciplinary analysis models,and could also reduce the mass of a stratospheric airship to be deployed at a specific *** on a theoretical analysis,three failure modes of airships including bending wrinkling failure,hoop tearing failure and bending kink failure,are given to describe and illustrate the failure mechanism of stratospheric *** results show that the location,length and size of the local uniform load and the large fineness ratio are easier to lead to bending wrinkling failure and bending kink *** small fineness ratio and the increasing differential pressure are more prone to cause hoop tearing failure for an airship *** failure probability is sensitive to the wind *** an optimization design,the reliability analysis is essential to be carried out based on the safety of the *** solution in this study can provide economical design recommendations.

关键词： Failure modes Mass optimization Optimal design Reliability analysis Stratospheric airship

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：