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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

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

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

New finite strain elastoplastic equations for accurately and explicitly simulating pseudoelastic-to-plastic transition effects of shape memory alloys

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Applied Mathematics and Mechanics(English Edition) 2020年第10期41卷 1583-1596页

作者： Siyu WANG Lin ZHAN huifeng xi Heng xiAO School of Mechanics and Construction Engineering MOE Key Lab of Disaster Forecast and Control in EngineeringJinan University601 West Huangpu AvenueGuangzhou 510632China Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China

A new finite strain elatoplastic J2-flow model with coupling effects of both isotropic and anisotropic hardening is proposed with the co-rotational logarithmic *** terms of certain single-variable shape functions representing uniaxial loading and unloading curves,explicit multi-axial expressions for the three hardening quantities incorporated in the new model proposed are derived in unified forms for the purpose of automatically and accurately simulating complex pseudoelastic-to-plastic transition effects of shape memory alloys(SMAs)under multiple loading-unloading *** examples show that with only a single parameter of direct physical meaning for each cycle,accurate and explicit simulations may be achieved for extensive data from multiple cycle tests.

关键词： shape memory alloy(SMA) finite deformation pseudo-elasticity plasticity cyclic loading transition effect elastoplastic equation explicit and accurate approach

Full Characterization of the Work-Hardening Behavior of Metals:An Accurate and Explicit Approach

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Acta Mechanica Solida Sinica 2020年第4期33卷 479-486页

作者： Zan Zhou Siyu Wang Lin Zhan huifeng xi Heng xiao School of Mechanics and Construction Engineering and MOE Key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou 510632China Shanghai Institute of Applied Mathematics and Mechanics&School of Mechanics and Engineering Science Shanghai UniversityShanghai 200072China

A new approach is proposed to characterize the work-hardening behavior of metals based on the stress-strain data from uniaxial extension *** this new approach,the yield strength as a function of the plastic work can be determined by directly fitting a wellchosen single-variable shape function to any given uniaxial data from the initial yielding up to the strength limit,in an explicit sense with no need to carry out the usual tedious trial-and-error procedures in treating nonlinear elastoplastic rate equations toward identifying numerous unknown *** examples show that the simulation results with the new approach are in accurate agreement with the test data.

关键词： Metals Elastoplasticity Finite strain Work-hardening Yield strength Strength limit Explicit characterization

Unified simulation of hardening and softening effects for metals up to failure

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Applied Mathematics and Mechanics(English Edition) 2021年第12期42卷 1685-1702页

作者： Siyu WANG Lin ZHAN huifeng xi O.T.BRUHNS 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

Toward accurately simulating both hardening and softening effects for metals up to failure,a new finite strain elastoplastic J2-flow model is proposed with the yield strength therein as a function of the plastic work in the explicit *** no need to identify any adjustable parameters,the uniaxial stress-strain response predicted from this new model is shown to automatically and accurately match any given data from monotonic uniaxial extension tests of *** such,the objectives in three respects are achieved for the first time,i.e.,(i)both the hardening and softening effects up to failure can be simulated in the sense of matching test data with no errors,(ii)the usual tedious implicit procedures toward identifying numerous unknown parameters need not be involved and can be totally bypassed,and(iii)the model applicability can be ensured in a broad sense for various metallic materials with markedly different transition effects from hardening to *** the new model,the complete response features of stretched bars and twisted tubes up to failure are studied,including the failure effects of bars under monotonic extension and tubes under monotonic torsion and,furthermore,the fatigue failure effects of bars under cyclic *** results show accurate agreement with the uniaxial data,and the results for both the shear stress and the normal stress at the finite torsion display realistic hardening-to-softening transition effects for the first time.

关键词： metal hardening softening failure necking yield strength accurate approach

A broadband metamaterial cylindrical lens antenna

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Chinese Science Bulletin 2010年第19期55卷 2066-2070页

作者： MA huifeng CHEN xi YANG xinMi XU HongSheng CHENG Qiang CUI TieJun State Key laboratory of MiUimeter Waves School of lnformation Science and Engineering Southeast University Nanjing 210096 China

We present a Luneberg-like cylindrical lens antenna experimentally using *** cylindrical lens antenna with a broad bandwidth is made up of the non-resonant I-shaped metamaterial *** near-field distributions of the metamaterial lens antenna are measured using a two-dimensional near-field microwave scanning apparatus,and agree well with the simulation *** far-field radiation patterns of the antenna are also presented to show the high-gain performance in the broad bandwidth.

关键词：透镜天线圆柱材料宽带介质结构带宽性能二维近场近场分布

Linkage analysis on chromosome 2 in essential hypotension pedigrees

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Chinese Science Bulletin 2002年第18期47卷 1538-1540页

作者： xi huifeng KE Yuehai xiAO Junhua LI Hongyu JIN Jianzhong HUANG Wei JIN Li LU Daru State Key Laboratory of Genetic Engineering Center for Anthropological StudiesSchool of Life SciencesFudan UniversityShanghai 200433China Chinese Human Genome Center at Shanghai Shanghai 201203China

It is a new approach to study the important genes related to the control of blood pressure by probing into hypotension and hypertension at the same time. Genome scanning on whole chromosome 2 in 8 hypotension pedigrees has been done and parameter (LOD score) and non-parameter (NPL score) were used in the linkage analysis by GENEHUNTER software. The results show the evidence of linkage between D2S112 and D2S117, indicating a number of critical genes may lie in this region and contribute to the mechanism of blood pressure regulation. Also this region has been found in the previous study in hypertension pedigrees. These genes may play an important role in the regulation of blood pressure and can also be the important candidate genes in hypertension studies.

关键词： hypotension genome scanning linkage analysis GENE-HUNTER regulation of blood pressure.

软基体混合胞孔材料的力学性能及抗多次冲击性能

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爆炸与冲击 2022年第6期42卷 60-68页

作者：陈松习会峰黄世清王博伟王小刚暨南大学力学与建筑工程学院重大工程灾害与控制教育部重点实验室广东广州510632 佛山软谷科技有限公司广东佛山528000

为了探索具有优异吸能性能的软基体混合胞孔材料的力学性能,研究该类材料在多次冲击下的冲击响应和材料的可恢复性,对一种软基体混合胞孔材料—人工软骨仿生超材料(artificial cartilage foam,ACF)进行了不同速度下的单轴拉伸和压缩实验... 详细信息

为了探索具有优异吸能性能的软基体混合胞孔材料的力学性能,研究该类材料在多次冲击下的冲击响应和材料的可恢复性,对一种软基体混合胞孔材料—人工软骨仿生超材料(artificial cartilage foam,ACF)进行了不同速度下的单轴拉伸和压缩实验,得到了ACF材料在不同应变率条件下的应力-应变曲线。并利用落锤冲击实验机对ACF材料和另一种软基体混合胞孔材料—发泡聚丙烯材料(expanded polypropylene,EPP)进行了多次冲击下的对比测试,得到了2种材料在单次和多次冲击下的动力学响应。实验结果表明:ACF材料是一种应变率敏感的材料,随着应变率的提升,材料的弹性模量、抗拉强度和抗压强度均逐渐提高;在50 J冲击能量作用下,ACF材料能够吸收96%以上的冲击能量,远高于EPP材料的70%,ACF材料具有更加优异的吸能性能;5次冲击后ACF材料的最大峰值力、最大变形量和吸能能力几乎不变。相比于EPP材料,ACF材料有良好的可恢复性,且具有稳定的多次抗冲击能力。这些研究为软基体混合胞孔材料在多次冲击防护中的应用提供了实验依据。

关键词：软基体混合胞孔材料应变率效应多次冲击可恢复性

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