检索结果-南通市图书馆

Acta Mechanica Solida Sinica 2024年第2期37卷 271-284页

作者： Hanxing Zhao Pengyu Cao Fengfeng Li Xin Lan Liwu Liu Yanju Liu jinsong leng Centre of Composite Materials and Structures Harbin Institute of Technology(HIT)Harbin150080China Department of Astronautical Science and Mechanics Harbin Institute of Technology(HIT)Harbin150001China

The mismatch in thermal expansion coefficients between the fiber-rich and resin-rich regions of a shape memory polymer composite(SMPC)laminate,along with the residual strain during SMPC fabrication,results in buckling deformation of the inhomogeneous *** paper presents a macroscopic model for buckling of an inhomogeneous SMPC laminate under initial biaxial *** linear and nonlinear buckling analyses are carried out using the energy *** influences of prestrain biaxiality,temperature,and ply angle on the buckling wavelength,critical buckling prestrain,and buckling amplitude are *** results demonstrate that the critical buckling wavelength of the SMPC laminate is independent of the prestrain,while the amplitude is almost independent of *** addition,the optimal fiber stacking configuration with the maximum critical buckling prestrains of inhomogeneous SMPC laminates is determined by a genetic algorithm.

关键词： Shape memory polymer composite Buckling behavior Inhomogeneous laminate Biaxial prestrains

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

黔东南州10个甘薯品种品比试验研究

耕作与栽培 2024年第3期44卷 110-112页

作者：杜磊冷劲松黔东南州农业农村局贵州凯里556000

本研究对10个甘薯品种进行品比试验,得出甘薯产量排序为:龙薯9号>莆薯32>黔薯2号>浙薯13>徐渝34>黔薯1号(ck)>黔薯5号>广薯87>黔紫薯1号>紫云红芯薯,其中龙薯9号与其余9个甘薯品种产量差异极显著,莆薯32与黔薯2号、浙薯13和徐渝34等9个... 详细信息

本研究对10个甘薯品种进行品比试验,得出甘薯产量排序为:龙薯9号>莆薯32>黔薯2号>浙薯13>徐渝34>黔薯1号(ck)>黔薯5号>广薯87>黔紫薯1号>紫云红芯薯,其中龙薯9号与其余9个甘薯品种产量差异极显著,莆薯32与黔薯2号、浙薯13和徐渝34等9个品种产量差异显著。从藤蔓生长情况看,黔薯5号,黔紫薯1号等品种地上藤蔓茂盛。最终筛选出龙薯9号、莆薯32等甘薯品种具有薯块产量和大薯率较高等优点,作为饲料和加工薯而言,比较适合在黔东南州大面积推广,而黔薯5号、黔紫薯1号等品种地上藤蔓茂盛,根据当前市场对甘薯产品多元化需求较大,可进一步探究作为叶菜型甘薯的食用品质及多次采摘产量情况。

关键词：甘薯品种筛选产量

Shape Memory Epoxy Resin and Its Composites:From Materials to Applications

在线全文

学校读者我要写书评

暂无评论

Research 2022年第2期2022卷 345-369页

作者： Lan Luo Fenghua Zhang jinsong leng Centre for Composite Materials and Structures Harbin Institute of Technology(HIT)Harbin 150080China

Shape memory polymers(SMPs)have historically attracted attention for their unique stimulation-responsive and variable stifness and have made notable progress in acrospace,civil industry,and other *** particular,epoxy resin(EP)has great potential due to its excellent mechanical properties,fatigue resistance,and radiation ***,we focus on the molecular design and network construction of shape memory epoxy resins(SMEPs)to provide opportunities for performance and functional *** and high-performance SMEPs are introduced in detail,including multiple SMEPs,two-way SMEPs,outstanding toughness,and termperature ***,emerging applications of SMEP's and their composites in aerospace,four-dimensional printing,and self-healing are *** on this,we point out the challenges ahead and how SMEPs can integrate performance and versatility to meet the needs of technological development.

关键词： composites printing resins

Advances in 4D printed shape memory composites and structures:Actuation and application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第5期66卷 1271-1288页

作者： WANG LinLin ZHANG FengHua DU ShanYi leng jinsong Centre for Composite Materials and Structures Harbin Institute of Technology(HIT)Harbin 150080China

Shape memory polymer composites(SMPCs)are a type of smart material that can change shapes under the stimulation of the external environment,and they have great potential in aerospace,biomedical,robotics,and electronic devices due to their advantages of high strength and toughness,lightweight,impact resistance,corrosion resistance,and aging resistance.4D printing technology has provided new opportunities for the further development of smart *** addition of various fillers enriches the variety of printable materials and provides composites with different properties and *** combination of SMPCs and printing technologies realizes the structure-function *** paper introduces the emergence and development of 4D printing technologies,the preparation methods and properties of SMPCs for 4D printing;as well as the research progress and potential application of 4D printable SMPCs in recent years in terms of thermal,electrical,magnetic,and optical ***,the existing problems and future development of 4D printable SMPCs are discussed.

关键词： shape memory polymer composites 4D printing deformable structures actuation modes applications

Shape memory poly(ether ether ketone)s with tunable chain stiffness,mechanical strength and high transition temperatures

在线全文

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2022年第1期13卷 1-16,I0001页

作者： Shuai Yang Yang He jinsong leng Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin150080P.R.China

Shape memory polymers,with intrinsic enhanced strength and high thermal stability,are highly demanded in aerospace,engineering manufacturing,and spatial *** this paper,we develop a series of thermoplastic shape memory poly(ether ether ketone)s(PEEKs)for the first time,achieving an excellent shape memory ability,high strength,and great thermal stability via a condensation polymer*** tuning the proportion of different bisphenol monomers,the flexibility of molecular main chains is adjusted,resulting in the regulation of transition temperature and mechanical perfor*** PEEKs possess the tunable T_(g) from 143.3°C to 178.6°C,the enhanced tensile strength from 48.4 to 65.1 MPa,and Young’s modulus from 0.45 to 1.8 GPa,in addition to the excellent heat-triggered shape memory effect,as indicated by high recovery ratio(94%–98.9%)and fixity ratio(over 99.5%).Furthermore,after incorporating the magnetocaloric Fe_(3)O_(4) particles,the composites exhibit remotely noncontact magnetic-triggered shape memory behaviors(Fe_(3)O_(4) content over 10 wt%).These synthesized T_(g) tunable shape memory PEEKs and the composites have wide utilization potential in fields of engineering and aerospace structures,owing to the excellent mechanical properties,thermal stability,unique programmable deformation ability,and remote actuation.

关键词： Shape memory PEEK tunable transition temperature high modulus magnetic actuation

Shape Memory Polymer Fibers:Materials,Structures,and Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advanced Fiber Materials 2022年第1期4卷 5-23页

作者： Lu Wang Fenghua Zhang Yanju Liu jinsong leng Centre for Composite Materials and Structures Harbin Institute of Technology(HIT)No.2 Yikuang StreetHarbin 150080People’s Republic of China Department of Astronautic Science and Mechanics Harbin Institute of Technology(HIT)No.92 West Dazhi StreetHarbin 150001People’s Republic of China

Shape memory polymer(SMP)is a kind of material that can sense and respond to the changes of the external environment,and its behavior is similar to the intelligent refection of ***,as a versatile and feasible technique,has been used to prepare shape memory polymer fbers(SMPFs)and expand their *** show some advanced features and functions in many *** this review,we give a comprehensive overview of SMPFs,including materials,fabrication methods,structures,multifunction,and ***,the mechanism and characteristics of SMP are *** then discuss the electrospinning method to form various microstructures,like non-woven fbers,core/shell fbers,hollow fbers and oriented ***,the multiple functions of SMPFs are discussed,such as multi-shape memory efect,reversible shape memory efect and remote actuation of *** also focus on some typical applications of SMPFs,including biomedical scafolds,drug carriers,self-healing,smart textiles and sensors,as well as energy harvesting *** the end,the challenges and future development directions of SMPFs are proposed.

关键词： Shape memory polymer Micro/nano fbers Electrospinning Microstructures Multifunctional composites Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

反四手性负泊松比蜂窝面外双曲变形研究

航空制造技术 2024年第1期67卷 79-86页

作者：杜林喆叶长水高飞宇孙健刘彦菊冷劲松哈尔滨工业大学先进复合材料国家重点实验室哈尔滨150001 航空工业成都飞机设计研究所成都610073 哈尔滨工业大学航天科学与力学系哈尔滨150001

针对反四手性负泊松比蜂窝面外变形快速求解问题,提出了一种利用数值拟合进行快速求解的方法。首先利用有限元分析软件对蜂窝的面外变形进行了求解,把结果数据分为训练数据及验证数据;然后使用最小二乘法对求解结果拟合,针对蜂窝面外变... 详细信息

针对反四手性负泊松比蜂窝面外变形快速求解问题,提出了一种利用数值拟合进行快速求解的方法。首先利用有限元分析软件对蜂窝的面外变形进行了求解,把结果数据分为训练数据及验证数据;然后使用最小二乘法对求解结果拟合,针对蜂窝面外变形的特点及量纲分析,构造了一个3参数的拟合方程,得到蜂窝对称轴上的拟合曲线。接着对求解结果及蜂窝尺寸参数进行二次拟合,得到蜂窝尺寸和变形曲线的关系,然后利用该关系对其他尺寸下蜂窝的变形曲线进行预测,并与验证数据进行对比。此后,对两段式非均匀蜂窝的面外变形也进行了仿真求解,利用均匀蜂窝的拟合结果及Logistic函数构造拟合函数进行拟合,并用拟合结果在其他尺寸下蜂窝的变形与验证数据进行对比。结果表明,拟合方程预测结果与仿真结果吻合良好。该数值方法可以运用于反四手性蜂窝变形预测与设计。

关键词：负泊松比反四手性蜂窝面外变形最小二乘法数值拟合

Shape recovery properties and load-carrying capacity of a 4D printed thick-walled kirigami-inspired honeycomb structure

在线全文

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2023年第2期6卷 189-203页

作者： Chengbin Yue Wei Zhao Fengfeng Li Liwu Liu Yanju Liu jinsong leng Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbin 150001China Center for Composite Materials and Structure Harbin Institute of TechnologyHarbin 150080China

Kirigami arts have provided a more promising method for building multiscale structures,which can shape two-dimensional(2D)sheets into three-dimensional(3D)configurations by cutting and ***,we first carried out a theoretical analysis of the mechanical properties of 2D honeycomb lattice structures and experimental verification combined with finite element(FE)***,a series of thick-walled 3D kirigami-inspired honeycomb(TW3KH)structures with different mechanical properties were designed and fabricated on the exploration and optimization of geometric parameters of 2D honeycomb *** investigations of folding feasibility,self-expansion,and self-folding performance experimentally showed that our designed four-dimensional(4D)printing structure had good programmability and shape memory capability and a large volume change ratio during shape ***,research on its compression deformation behavior found that the TW3KH structures can recover load-bearing capacity very well when the angle is ***,these TW3KH structures have great advantages in space-saving smart load-bearing equipment.

关键词： Shape memory 4D printing Kirigami arts Pattern transformation

A bio-inspired 3D metamaterials with chirality and anti-chirality topology fabricated by 4D printing

在线全文

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2023年第1期14卷 1-20页

作者： Wei Zhao Jie Zhu Liwu Liu jinsong leng Yanju Liu Department of Astronautical Science and Mechanics Harbin Institute of Technology(HIT)HarbinPeople’s Republic of China Center for Composite Materials and Structures Harbin Institute of Technology(HIT)HarbinPeople’s Republic of China

Artificial architected metamaterials equipped with unique mechanical and physical properties that are naturally inaccessible can be obtained by rational *** this work,the innovative three-dimensional(3D)chiral and anti-chiral metamaterials are developed referring to the face-rotating polyhedral(FRP)structure present in the *** assembling planar triangular units into the regular octahedron cells,several typical forms of chiral and anti-chiral metamaterials can be obtained by different assembly *** changing the topology parameters,the Poisson’s ratio can be adjusted between[0,2.8].The metamaterials are fabricated by 3D printing utilizing shape memory polymer,and the mechanical properties are analyzed via Finite Element Analysis(FEA)and experiments,including Young’s modulus,Poisson’s ratio,and tension-twist coupling *** addition,target metamaterial with specific local deformation behavior is obtained by programmatic calculations and distributions to meet special requirements or achieve unique *** shape memory property endows the mechanical metamaterials with more potential applications.

关键词： 3D assembly tension-twist coupling chiral and anti-chiral metamaterials shape memory

Mechanical properties and shape memory behavior of 4D printed functionally graded cellular structures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第12期66卷 3522-3533页

作者： ZENG ChengJun LIU LiWu ZHAO Wei LIU ZhengXian XIN XiaoZhou LIU YanJu leng jinsong Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbin 150001China Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150080China

The properties of functionally graded(FG) cellular structures vary spatially, and the varying properties can meet the requirements of different working environments. In this study, we fabricated FG cellular structures with shape memory effect by 4D printing and evaluated the compressive performance and shape memory behavior of these structures with temperature through experimental analysis and finite element simulations. The results show that the maximum energy absorption gradually decreases but the compressive modulus gradually increases with increasing gradient parameters. Moreover, the finite element simulations also show that the compressive deformation mode of the structure shifts from uniform to non-uniform deformation with increasing gradient parameters. The compressive modulus and compressive strength of 4D printed FG structures decrease with increasing temperature due to the influence of the shape memory polymer, and they exhibit outstanding shape recovery capability under high-temperature stimulus. The proposed 4D printed FG structures with such responsiveness to stimulus shed light on the design of intelligent energy-absorbing devices that meet specific functional requirements.

关键词： functionally graded structures 4D printing shape memory polymers energy absorption cellular structures