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A Review on the Mullins Effect in Tough Elastomers and Gels

Acta Mechanica Solida Sinica 2024年第2期37卷 181-214页

作者： Lin Zhan Shaoxing Qu Rui Xiao MOE Key Lab of Disaster Forecast and Control in Engineering College of Mechanics and Construction EngineeringJinan UniversityGuangzhou510632China State Key Laboratory of Fluid Power and Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceDepartment of Engineering MechanicsZhejiang UniversityHangzhou310027China

Tough elastomers and gels have garnered broad research interest due to their wide-ranging potential ***,during the loading and unloading cycles,a clear stress softening behavior can be observed in many material systems,which is also named as the Mullins *** this work,we aim to provide a complete review of the Mullins effect in soft yet tough materials,specifically focusing on nanocomposite gels,double-network hydrogels,and multi-network *** first revisit the experimental observations for these soft *** then discuss the recent developments of constitutive models,emphasizing novel developments in the damage mechanisms or network *** phenomenological models will also be briefly *** attention is then placed on the anisotropic and multiaxial modeling *** is demonstrated that most of the existing models fail to accurately predict the multiaxial data,posing a significant challenge for developing future anisotropic models tailored for tough gels and elastomers.

关键词： Mullins effect Double-network hydrogels Nanocomposite gels Multi-network elastomers Anisotropic damage model Multiaxial model

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Study on the influence of retroreflective materials on the“secondary reflection”on the room above the horizontal sunshade

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Frontiers of Architectural Research 2023年第2期12卷 386-393页

作者： Chao Liu Jian Tang Key Laboratory of Disaster Forecast and Control in Engineering(MOE) Jinan UniversityGuangzhouChina Guangdong University of Finance&Economics GuangzhouChina

Existing studies on horizontal sunshade systems mainly focus on the influence of the sunshade on the room under or inside the sunshade ***,the top surface of horizontal sunshade,especially those with mirror surface or made of metal,reflects solar radiation into the indoor and surroundings,resulting in“secondary reflection”.This paper mainly focuses on the influence of secondary reflection on the room above the sunshade,using DesignBuilder software to conduct numerical simulation analysis and building architectural model for field *** from simulation and field measurement both prove that mirror materials increase secondary reflection reflected into the ***,results from experiments show that retroreflective materials decrease secondary reflection reflected into the *** low latitude,the application of retroreflective materials on the top surface of horizontal sunshade effectively reduces the adverse influence of secondary reflection on the room above the sunshade.

关键词： Retroreflective material use Horizontal sunshade Secondary reflection

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Exact simulation for direction-dependent large elastic strain responses of soft fibre-reinforced composites

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Applied Mathematics and Mechanics(English Edition) 2023年第9期44卷 1497-1510页

作者： Huifeng XI Guicheng ZHAO OBRUHNS Siyu WANG Heng XIAO School of Mechanics and Construction Engineering MOE Key Lab of Disaster Forecast and Control in EngineeringJinan UniversityGuangzhou 510632China Institute of Mechanics Ruhr-University BochumBochum D-44780Germany

An explicit form of the elastic strain-energy function for direction-dependent large elastic strain behaviors of soft fiber-reinforced composites is first presented based upon a decoupled approach for simulating complex nonlinear coupling *** this form,the exact closed-form solutions are then obtained for the uniaxial tension responses in the fiber and cross-fiber *** such exact solutions,the issue of simultaneously simulating strongly coupling nonlinear responses in the fiber and cross-fiber directions may be reduced to the issue of separately treating each decoupled uniaxial stress-strain response,thus bypassing usual complexities and uncertainties involved in identifying a large number of strongly coupled adjustable *** numerical examples given are in good agreement with the experimental data for large strain responses.

关键词： soft solid fiber-reinforced composite large elastic strain transverse isotropy strain-energy function logarithmic strain decoupling approach

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Analysis of Full-Ranged Failure Process of Bonded Pipe Joints under Tension

Analysis of Full-Ranged Failure Process of Bonded Pipe Joint...

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作者： Yuan, Hong Han, Jun Mo, Ziyong Zeng, Lan MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China

The mechanical properties of pipe joints are of vital importance to the performance of pipe structures. In order to further understand the whole failure process of adhesive pipe joints to maintain their good condition subjected to tensile loads, the analytical solutions are deduced in this paper, along with the parameter analysis by numerical simulations. A concise rigid-softening cohesive model was adopted to characterize the deformation of the interface. The whole failure process divided into different sections was discussed in detail and closed-form solutions of slip and shear stress were obtained. The finite element method (FEM) model for the bonded pipe joints under certain situations was established using commercial software ABAQUS, and the analytical and FEM results were accordant. The mechanism of shear stress transfer, the growth regulation of interface cracks and the mechanical performance of the joints under tensile loads were quantitatively obtained. These outcomes may help for the design, application and reinforcement of bonded pipe joints and can be compatible to other orthotropic materials. © 2023 World Scientific Publishing Company.

关键词： Shear stress

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A theoretical model for impact protection of flexible polymer material

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Theoretical & Applied Mechanics Letters 2024年第3期14卷 217-226页

作者： Huifeng Xi Hui Pan Song Chen Heng Xiao MOE Key Lab of Disaster Forecast and Control in Engineering School of Machanics and Construction EngineeringJinan UniversityGuangzhou 510632China Doctor Workstation of Xuwen County Guangdong Hydropower Energy Co. Ltd.Xuwen 524100China

The relationship between the protective performance of flexible polymer material and material parameters(elasticmodulus,viscosity coefficient)is explored,an impact collision motion equation between two bodies is establishedfrom the viscoelastic material constitutive,and the relationship between the kinematic response and the materialparameters is *** on the Kelvin constitutive model,a theoretical model for impact between the pro-tective body and the protected body is established,then the dynamic response is *** feasibility of themodel was verified by drop hammer experiment,and the material parameters(elastic modulus,viscosity coeffi-cient)were obtained by *** model is discretized and the relationship between local impact response andmaterial parameters is *** discussion results on the relationship between the impact response and theprotective material performance indicate that adjusting the elastic modulus,viscosity coefficient,and thicknessof the protective material can effectively improve protective effect.

关键词： Flexible polymer material Viscoelastic material Kelvin modelDynamic response Elastic modulus and viscosity coefficient

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Experimental and Numerical Studies on Sea Sand Concrete Filled Stainless Steel Tube with Inner FRP Tube Subjected to Axial Compression

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China Ocean engineering 2023年第2期37卷 272-287页

作者： ZENG Lan YU Wen-lan MO Zi-yong HUANG Shi-qing YUAN Hong MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction EngineeringJinan UniversityGuangzhou 510632China Construction Engineering Quality and Safety Supervision Station of Renshou County Meishan 620500China School of Architectural Engineering Guangzhou Institute of Science and TechnologyGuangzhou 510540China

Since fibre-reinforced polymer(FRP) and stainless steel(SS) offer advantages of corrosion resistance and hybrid confinement, this study proposed a new type of composite column: sea sand concrete(SSC)-filled SS tubular columns with an inner FRP tube(CFSTFs) to help exploit abundant ocean resources in marine engineering. To study compressive behaviours of these novel members, eight CFSTFs and two SSC-filled SS tubular columns(CFSTs)were tested under axial compression. Their axial load-displacement curves, axial load-strain curves in SS or FRP tubes were obtained, and influences of key test parameters(the existence of glass FRP(GFRP) tubes, steel tube shapes, and GFRP tube thicknesses and diameters) were discussed. Further, specimen failure mechanism was analyzed employing the finite element method using ABAQUS software. Test results confirmed the excellent ductility and load-bearing capacity of CFSTFs. The existence of GFRP tubes inside can postpone SS tube buckling, and the content of inner FRP tubes, particularly increasing diameters, was found to improve compressive behaviours. GFRP contents helped develop the second elastic-plastic stage of the load-displacement curves. Furthermore, the bearing capacity of CFSTFs with a circular cross-section was approximately 26% higher than that with a square cross-section, and this difference narrowed with the increase in GFRP ratios.

关键词： sea-sand concrete(SSC) confined concrete column fibre-reinforced polymer(FRP)tube stainless steel tube axial compression

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Multi-objective optimization of a bistable curved shell with controllablethickness based on machine learning

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Theoretical & Applied Mechanics Letters 2024年第6期14卷 467-476页

作者： Shiqing Huang Chenjie Zhao Xiaoqian Ning Wenhua Zhang Huifeng Xi Zhiwei Wang Changxian Wang School of Mechanics and Construction Engineering Jinan UniversityGuangzhou 510632China College of Packaging Engineering Jinan UniversityZhuhai 519070China MOE key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou 510632China Academy of Military Sciences Beijing 100091China

Bistable curved shells have become a promising low-cost application in energy absorption fields owing to recentadvances in material and *** research has been conducted to improve their energy absorptioneffect through forward prediction and single-objective ***,these approaches may not fully explore their functional *** this study,we propose a multi-objective optimization framework based on theprinciple of main objective optimization that combines neural networks and genetic *** energy absorption effect and backward snapping force of the bistable curved shell are improved ***,a reverse design algorithm is developed to generate the preset load-displacement curve,which further expandsthe application of machine learning methods in the field of multi-objective *** combination ofmachine learning and multi-objective optimization is highly effective for building meta-structures with specificperformance requirements and has potential applications in solving complex optimization tasks in various fields.

关键词： Bistable curved shell Structure optimization Machine learning Multi-objective optimization Reverse design

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Energy Absorption Characteristics of a Novel Asymmetric and Rotatable Re-entrant Honeycomb Structure

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Acta Mechanica Solida Sinica 2021年第4期34卷 550-560页

作者： Huifeng Xi Jiachu Xu Shende Cen Shiqing Huang MOE Key Laboratory of Disaster Forecast and Control in Engineering and School of Mechanics and Construction Engineering Jinan UniversityGuangzhou510632China

Based on the symmetric re-entrant honeycomb(S-RH)structure with negative Poisson’s ratios,a novel asymmetric and rotatable re-entrant honeycomb(AR-RH)structure was *** the S-RH structure and AR-RH structure were produced by the 3D printing *** experimental test and finite element simulation,the deformation mechanism and energy absorption characteristics of the AR-RH structure and the S-RH structure with negative Poisson’s ratios at different impact velocities were *** experimental test and finite element simulation results show that the novel AR-RH structure with negative Poisson’s ratios has stronger energy absorption capacity than the S-RH structure,and it has been verified that the rotatability of AR-RH can indeed absorb ***,the degree of asymmetry of the AR-RH structure was discussed.

关键词： Asymmetric and rotatable re-entrant honeycomb structure Dynamic compression Energy absorption characteristics Metal 3D printing technology

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Cushioning Performance of a Novel Polyurethane Foam Material Applied in Fragile Packaging

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Acta Mechanica Solida Sinica 2024年第3期37卷 487-497页

作者： Huifeng Xi Chunqiu Guo Jinbiao Yang Xiaogang Wang Bowei Wang Shiqing Huang Zhiwei Wang School of Mechanics and Construction Engineering Jinan UniversityGuangzhou510632China College of Packing Engineering Jinan UniversityZhuhai519070China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou510632China Foshan Soft Valley Technology Co. Ltd.Foshan528000China

For fragile products,packaging requires cushioning protection to prevent irreversible damage from accidental falls,transportation impacts,and other *** new polyurethane foam(PUF)material demonstrates superior cushioning and vibration isolation performance in practical applications,effectively minimizing damage from *** and vibration experiments were conducted on packages comprising novel PUF,expandable polyethylene,ethylene-vinyl acetate copolymer foam,and *** verify that the new PUF material outperforms in cushioning and vibration isolation,as observed from the acceleration ***,a random vibration analysis of a packaging unit involving different thicknesses of PUF materials and bracelets reveals the enhanced vibration isolation effect within a specific thickness *** vibration results of the bracelet’s outer packaging align closely with finite element simulation results,validating the effectiveness of designing and optimizing the outer *** finite element simulation,deeper understanding and prediction of the bracelet’s vibration response under various conditions is achieved,facilitating optimized packaging design for better protection and vibration damping.

关键词： Flexible polyurethane foam Packaging of fragile goods Nonlinear dynamics Vibration frequency Finite element simulation

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In-situ forming ultra-mechanically sensitive materials for high-sensitivity stretchable fiber strain sensors

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National Science Review 2024年第6期11卷 254-263页

作者： Rouhui Yu Changxian Wang Xiangheng Du Xiaowen Bai Yongzhong Tong Huifang Chen Xuemei Sun Jing Yang Naoji Matsuhisa Huisheng Peng Meifang Zhu Shaowu Pan State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University MOE Key Lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Institute of Fiber Materials and Devices Fudan University Department of Cardiology Shanghai Xuhui Central HospitalZhongshan-Xuhui Hospital Fudan University Research Center for Advanced Science and Technology and Institute of Industrial Science The University of Tokyo

Fiber electronics with flexible and weavable features can be easily integrated into textiles for wearable applications. However, due to small sizes and curved surfaces of fiber materials, it remains challenging to load robust active layers, thus hindering production of high-sensitivity fiber strain sensors. Herein, functional sensing materials are firmly anchored on the fiber surface in-situ through a hydrolytic condensation *** anchoring sensing layer with robust interfacial adhesion is ultra-mechanically sensitive, which significantly improves the sensitivity of strain sensors due to the easy generation of microcracks during stretching. The resulting stretchable fiber sensors simultaneously possess an ultra-low strain detection limit of 0.05%, a high stretchability of 100%, and a high gauge factor of 433.6, giving 254-folds enhancement in sensitivity. Additionally, these fiber sensors are soft and lightweight, enabling them to be attached onto skin or woven into clothes for recording physiological signals, e.g. pulse wave velocity has been effectively obtained by them. As a demonstration, a fiber sensor-based wearable smart healthcare system is designed to monitor and transmit health status for timely intervention. This work presents an effective strategy for developing high-performance fiber strain sensors as well as other stretchable electronic devices.

关键词： fiber strain sensor stretchable wearable healthcare

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