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Experimental study of solid-liquid origami composite structures with improved impact resistance

Theoretical & Applied Mechanics Letters 2024年第2期14卷 118-123页

作者： Shuheng Wang Zhanyu Wang Bei Wang Zhi Liu Yunzhu Ni Wuxing Lai Shan Jiang Yong An Huang AML Department of Engineering MechanicsLaboratory of Flexible Electronics TechnologyTsinghua UniversityBeijing 100084China Institute of Advanced Structure Technology Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and StructuresBeijing Institute of TechnologyBeijing 100081China Hangzhou Institute of Technology Xidian UniversityHangzhou 311200China Nanjing Research Institude of Electronics Technology Nanjing 210039China The Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China

In this paper,a liquid-solid origami composite design is proposed for the improvement of impact resistance.Employing this design strategy,Kresling origami composite structures with different fillings were designed and fabricated,namely air,water,and shear thickening fluid(STF).Quasi-static compression and drop-weight impact experiments were carried out to compare and reveal the static and dynamic mechanical behavior of these structures.The results from drop-weight impact experiments demonstrated that the solid-liquid Kresling origami composite structures exhibited superior yield strength and reduced peak force when compared to their empty counterparts.Notably,the Kresling origami structures filled with STF exhibited significantly heightened yield strength and reduced peak force.For example,at an impact velocity of 3 m/s,the yield strength of single-layer STF-filled Kresling origami structures increased by 772.7%and the peak force decreased by 68.6%.This liquid-solid origami composite design holds the potential to advance the application of origami structures in critical areas such as aerospace,intelligent protection and other important fields.The demonstrated improvements in impact resistance underscore the practical viability of this approach in enhancing structural performance for a range of applications.

关键词： Solid-liquid design Origami structure impact resistance Shear thickening fluid

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Hygrothermal effect on high-velocity impact resistance of woven composites

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Defence Technology（防务技术） 2022年第5期18卷 823-833页

作者： Xiao-chen Yang Nan Jia School of Urban Construction Eastern Liaoning UniversityWenhua 325Dandong118003China College of Safety Science and Engineering Liaoning Technical UniversityFuxin123000China China Coal Technology&Engineering Group Shenyang Research Institute Fushun113122China State Key Laboratory of Coal Mine Safety Technology Fushun113122China

The woven glass fiber reinforced composites(GFRP)subjected to high-speed impact is investigated to identify the hygrothermal aging effect on the impact resistance.Both the hygrothermal aged and unaged glass/epoxy laminates are subjected to different impact velocities,which is confirmed as a sensitive factor for the failure modes and mechanisms.The results show the hygrothermal aging effect decreases the ballistic limit by 14.9%,but the influence on ballistic performance is limited within the impact velocity closed to the ballistic limit.The failure modes and energy dissipation mechanisms are confirmed to be slightly influenced by the hygrothermal aging effect.The hygrothermal aging effect induced localization of structural deformation and degradation of mechanical properties are the main reasons for the composite undergoing the same failure modes at smaller impact velocities.Based on the energy absorption mechanisms,analytical expressions predict the ballistic limit and energy absorption to reasonable accuracy,the underestimated total energy absorption results in a relatively poor agreement between the measured and predicted energy absorption efficiency.

关键词： Hygrothermal aging effect Woven glass/epoxy composite impact resistance Dynamic failure Energy absorption

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Study of impact resistance Based on Porcupine Quills Bionic Thin-walled Structure

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Journal of Bionic Engineering 2023年第5期20卷 1942-1955页

作者： Tianshu Huang Zhengyu Mao Lijun Chang Xingyuan Huang Zhihua Cai Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Hunan University of Science and TechnologyXiangtanChina School of Mechanical Engineering Hunan University of Science and TechnologyXiangtanChina

Using an electron microscope to observe the microstructure of a porcupine quills cross-section and a bionic method,a new bionic structure was proposed.The performance of the structure in terms of energy absorption,maximum impact force withstood,and impact force efficiency was evaluated using Ansys finite element simulation software to simulate the structure's impact.To examine the impact of ribs on the structural performance of the bionic porcupine quills,a control structure was developed.According to the results of the finite element simulation,the presence of ribs in the Bionic porcupine quills structure can transfer stress uniformly to the overall structure and share stress for some of the rupture-prone regions.Ribs reduce stress concentration in specific areas and increase the impact force efficiency of the structure.The SEA and IFE values of bionic porcupine quills were 30.01 kJ/kg and 84.22%,respectively.The structure is then optimized for parameter design in order to find the optimal structure by response surface in order to improve the structure's SEA and decrease its MIF.In order to evaluate the precision of the response surface,the optimal structure predicted is validated using finite element simulation.

关键词： Bionic structure design Thin-walled structure impact resistance Specific energy absorption Multi-objective optimization

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impact resistance of a Novel Expanded Polystyrene Cement-based Material

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Journal of Wuhan University of Technology(Materials Science) 2014年第2期29卷 284-290页

作者：朱洪波 LI Chen WANG Peiming WU Mengxue YAN Meizhu Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education Tongji University

The mechanical property of a novel expanded polystyrene cement-based material （EPS-C）, which was prepared by compressing semi-dry materials molding, was investigated. The compressive behavior was analyzed by compression tests to gain the energy absorbed during failure. Performance for impact resistance was tested by a self-made device. The results figures out that the EPS-C has good toughness and can reach swain of 0.7 without failure. The stress-strain curve is quite different from that of normal EPS concrete. It can be divided into three stages and in the third stage the compressing exhibits the highest energy absorption. With the rising of cement ratio, the impact force absorption （IEA） decreases first and then increases. The impact energy absorption （IEA） increases first and then decreases. The lowest IEA and the highest lEA appear at the cement dosage from 233 g/L to 267 g/L and from 233 g/L to 300 g/L, respectively.

关键词： expanded polystyrene （EPS） cement compressing semi-dry materials molding compressive＇behavior impact resistance

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High impact resistance Epoxy Resins by Incorporation of Quadruply Hydrogen Bonded Supramolecular Polymers

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Chinese Journal of Polymer Science 2016年第7期34卷 850-857页

作者： Zhuo-ye Chai 谢众 Peng Zhang Xiao Ouyang Rui Li Shan Gao 魏浩 Lian-he Liu Zhi-jun Shuai College of Power andEnergy Engineering Harbin Engineering University Harbin 150001 China Key Laboratory of Superlight Material and Surface Technology Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

A bisphenol A based epoxy was incorporated with a quadruply hydrogen bonded supramolecular polymer as a toughening agent to prepare a composite epoxy resin with higher impact resistance. The supramolecular polymer comprising poly-（propylene glycol） bis（2-aminopropyl） ether chains and 2-ureido-4[1H]-pyrimidinone moieties（UPy） self-assembled into spherical domains with sizes of 300 nm to 600 nm in diameter by micro phase separation in bulk epoxy matrixes. A significant improvement of 300% in impact resistance of the supramolecular polymer incorporated epoxy resin was obtained when the content of supramolecular polymer was 10 wt%. Tensile tests showed that the mechanical properties of the modified epoxy resin containing the hydrogen-bonded supramolecular polymers are also improved compared with those of the neat epoxy resin.

关键词： Supramolecular polymer Epoxy resin Hydrogen bond impact resistance

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Solid–Liquid Composites with High impact resistance

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Acta Mechanica Solida Sinica 2021年第6期34卷 911-921页

作者： Miao Yu Xiying Li Pengyu Lv Huiling Duan Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing100871China CAPT HEDPS and IFSA Collaborative Innovation Center of MoEPeking UniversityBeijing100871China

Solid–liquid composites(SLCs)with novel thermal/electronic/mechanical properties imparted by programmable and functional liquid inclusions have attracted considerable research interest in recent years,and are widely used in smart electronics and soft robotics.The feasible application of SLCs requires that they exhibit excellent static physical properties as well as dynamic impact resistance to satisfy complex service conditions,such as drops and impacts.This paper examined the impact resistance of SLCs fabricated by using microfluidic 3D printing.The results of dynamic split-Hopkinson pressure bar(SHPB)tests showed that the performance of the fabricated SLCs improved in terms of energy dissipation and impact resistance compared with pristine materials.In case of dynamic impact in the strain rates ranging from 100 to 400s−1,the SLC specimen deformed without fracture,and its energy dissipation was dominated by the viscosity of the liquid inclusions.For dynamic impact in the strain rates ranging from 500 to 800s−1,the SLC specimen fractured and its energy dissipation was determined by the volume fraction of the liquid inclusions.Thus,the energy dissipation of the SLCs could be tuned by regulating the viscosity and volume fraction of the liquid inclusions to satisfy the requirements of protection against different strain rates.Furthermore,the process of fracture of the SLCs under the dynamic SHPB tests was recorded and analyzed by using a high-speed camera.The results showed that distributed liquid inclusions changed the paths of crack propagation to enhance energy dissipation in the SLCs.This study experimentally verified the enhancement in the energy dissipation of SLCs,and provided design strategies for developing multifunctional SLCs with high impact resistance.

关键词： Solid-liquid composites(SLCs) impact resistance Dynamic SHPB Energy dissipation Fracturing process

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Influence of modeling approaches and structural parameters on impact resistance of the human porous cranium

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Acta Mechanica Sinica 2021年第6期37卷 910-928,I0001页

作者： Qianqian Wu Jian Xiong Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin150001China

Failure mechanism and impact resistance of a human porous cranium are studied in detail by means of theoretical and numerical methods.It is hypothesized that pore distribution of a cranium directly affects cranial energy absorption,and a stretched beam model and a real beam model are taken as the example for the verification.Meanwhile,for the purpose of comparison with numerical results,a theoretical model is also proposed for the prediction of residual velocity and contact force of the impactor for an impacted skull.Compared with the real beam model,the stretched beam model containing through-thickness pores is easily deformed under the impact,thereby buffering well the external impact energy.The energy absorption efficiency of both the stretched beam model and real beam model is concerned with the threshold velocity for penetration which is directly related to the size of the structural damage area.Overall,there is good agreement between numerical and theoretical results.In addition,the effect of structural geometric parameters(shape and size of the impactor)on the impact resistance of the skull bone is theoretically investigated.The study provides reference for the evaluation of the energy absorption and failure mechanism of the skull under impact loads.

关键词： Skull porous structure impact resistance Modeling approach Theoretical prediction Influence of structural parameters

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Improvement of impact resistance of plain-woven composite by embedding superelastic shape memory alloy wires

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Frontiers of Mechanical Engineering 2020年第4期15卷 547-557页

作者： Xiaojun GU Xiuzhong SU Jun WANG Yingjie XU Jihong ZHU Weihong ZHANG Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Engineering Laboratory of Aerospace Structure Design and Application Northwestern Polytechnical UniversityXi’an 710072China

Carbon fiber reinforced polymer (CFRP) composites have excellent mechanical properties, specifically, high specific stiffness and strength. However, most CFRP composites exhibit poor impact resistance. To overcome this limitation, this study presents a new plain-woven CFRP composite embedded with superelastic shape memory alloy (SMA) wires. Composite specimens are fabricated using the vacuum-assisted resin injection method. Drop-weight impact tests are conducted on composite specimens with and without SMA wires to evaluate the improvement of impact resistance. The material models of the CFRP composite and superelastic SMA wire are introduced and implemented into a finite element (FE) software by the explicit user-defined material subroutine. FE simulations of the drop-weight impact tests are performed to reveal the superelastic deformation and debonding failure of the SMA inserts. Improvement of the energy absorption capacity and toughness of the SMA-CFRP composite is confirmed by the comparison results.

关键词： carbon fiber reinforced polymer composite shape memory alloy wire impact resistance drop-weight test finite element simulation

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Study on the impact resistance of Micromachined Gyroscope Spring Beams

Study on the Impact Resistance of Micromachined Gyroscope Sp...

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2011工程机械与车辆工程新进展国际学术会议

作者： Jiang Tao Zhou Jian Yao Sai Liu Guangjun College of Mechanical Engineering Tongji University Shanghai 201804 China

＜正＞The impact resistance of spring beams is studied based on the beams of tuning fork vibratory micromachined gyroscope.First the response and the failure of spring beams on high-g impact are analyzed,then the force status of different structures is deduced according to the Energy Law. Considering the force status and the elasticity of beams,the optimal design is given and the impact resistance of different beams is analyzed.The optimization result shows that the impact resistance of straight spring beam is the best,U-shaped beam is the worst.Also,maximizing the overall structure size of the spring beams or preferring spring beams with larger elasticity under the premise of meeting the system dynamic performance requirement can increase impact resistance significantly.

关键词： Microgyroscope Micromachined spring beam impact resistance Optimization

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Flexible and breathable 3D porous SSE/MXene foam towards impact/electromagnetic interference/bacteria multiple protection performance for intelligent wearable devices

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Nano Research 2023年第7期16卷 10164-10174页

作者： Min Sang Shuai Liu Jianpeng Wu Xinyi Wang Junshuo Zhang Yunqi Xu Yu Wang Jun Li Ji Li Shouhu Xuan Xinglong Gong CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China Anhui Weiwei Rubber Parts Group Co. Ltd.Tongcheng 231460China

As intelligent wearable devices,they will inevitably be subjected to various damages and disturbances from the external environment during daily use.Therefore,it is urgent to develop safeguarding materials with multiple protective properties.Herein,this work developed a flexible and breathable three-dimensional(3D)porous shear stiffening elastomer(SSE)/MXene(M-SSE)foam with impact/electromagnetic interference(EMI)/bacteria multiple protection performance for intelligent wearable devices.The continuous conductive MXene network in the 3D SSE porous structure made M-SSE foam exhibit excellent electromagnetic interference shielding property with a high shielding effectiveness of 34 dB.Attributed to the shear stiffening effect of porous SSE matrix,M-SSE foam possessed unique anti-impact and protection properties.The energy dissipation rate reached up to more than 85%,illustrating M-SSE foam could effectively attenuate the external impact force and absorb the impact energy.Inherited from the excellent photothermal performance of MXene,M-SSE foam achieved a considerable saturated temperature of 98℃ under 0.57 W/cm^(2) laser power.Therefore,M-SSE foam showed extraordinary antimicrobial property for Staphylococcus aureus according to the principle of photothermal sterilization.Finally,for the development of intelligent wearable devices,conductive MSSE foam could be used as an intelligent sensor to monitor various human movements owing to the highly sensitive property.This work greatly expanded the application prospect of multifunctional protective materials in various complex environments and promoted the development of multifunctional smart wearable devices in protection field.

关键词： MXene three-dimensional(3D)porous foam electromagnetic interference shielding impact resistance antibacterial property intelligent wearable device

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