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Experimental study and numerical simulation of the impact of under-sleeper pads on the dynamic and static mechanical behavior of heavy-haul railway ballast track
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作者 Yihao Chi Hong Xiao +2 位作者 Yang Wang Zhihai Zhang Mahantesh M.Nadakatti 《Railway Engineering Science》 EI 2024年第3期384-400,共17页
Laying the under-sleeper pad(USP)is one of the effective measures commonly used to delay ballast degradation and reduce maintenance workload.To explore the impact of application of the USP on the dynamic and static me... Laying the under-sleeper pad(USP)is one of the effective measures commonly used to delay ballast degradation and reduce maintenance workload.To explore the impact of application of the USP on the dynamic and static mechanical behavior of the ballast track in the heavy-haul railway system,numerical simulation models of the ballast bed with USP and without USP are presented in this paper by using the discrete element method(DEM)-multi-flexible body dynamic(MFBD)coupling analysis method.The ballast bed support stiffness test and dynamic displacement tests were carried out on the actual operation of a heavy-haul railway line to verify the validity of the models.The results show that using the USP results in a 43.01%reduction in the ballast bed support stiffness and achieves a more uniform distribution of track loads on the sleepers.It effectively reduces the load borne by the sleeper directly under the wheel load,with a 7.89%reduction in the pressure on the sleeper.Furthermore,the laying of the USP changes the lateral resistance sharing ratio of the ballast bed,significantly reducing the stress level of the ballast bed under train loads,with an average stress reduction of 42.19 kPa.It also reduces the plastic displacement of ballast particles and lowers the peak value of rotational angular velocity by about 50%to 70%,which is conducive to slowing down ballast bed settlement deformation and reducing maintenance costs.In summary,laying the USP has a potential value in enhancing the stability and extending the lifespan of the ballast bed in heavy-haul railway systems. 展开更多
关键词 Heavy-haul railway Under-sleeper pad Discrete element method Multi-flexible body dynamic coupling analysis mechanical behavior Quality state
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Dynamic Simulation of Mechanical System for Quickfeeding Shells in Gunboat4 被引量:1
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作者 ZHANG Xu, ZHANG Jia-tai, HU Sheng-haiCollege of Mechanical and Electrical Engineering, Harbin Engineering University,Harbin 150001 ,China 《哈尔滨工程大学学报(英文版)》 2002年第2期51-54,共4页
A mechanical system for quickfeeding shells in gunboat is particularly analyzed from a dynamic view. SD nonlinear structural simulation is completed by means of dynamic explicit finite element method. Analysis results... A mechanical system for quickfeeding shells in gunboat is particularly analyzed from a dynamic view. SD nonlinear structural simulation is completed by means of dynamic explicit finite element method. Analysis results prove that the mechanical structure is feasible substantially, the material of outer surfaces near striking and overstress position should be improved and measures should be taken to avoid parts high temperature. And all analysis results give a principal theoretical basis for further work. 展开更多
关键词 quickfeeding SHELLS mechanical system dynamic analysis EXPLICIT FINITE ELEMENT
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Dynamic-mechanical analysis and SEM morphology of wood flour/polypropylene composites
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作者 GUO Chui-gen SONG Yong-ming WANG Qing-wen SHEN Chang-sheng 《Journal of Forestry Research》 SCIE CAS CSCD 2006年第4期315-318,共4页
A study was conducted to investigate the effects of compatibilizers, including Maleic anhydride grafted polypropylene (MA-PP) and maleic anhydride grafted ethylene-propylene-diene copolymer (MA-EPDM), on wood-flou... A study was conducted to investigate the effects of compatibilizers, including Maleic anhydride grafted polypropylene (MA-PP) and maleic anhydride grafted ethylene-propylene-diene copolymer (MA-EPDM), on wood-flour/polypropylene (WF/PP) composites. WF/PP composites were prepared by direct extrusion profiles using a twin-screw/single-screw extruder system. DMA analysis showed that the loss factor of composites decreased and the storage modulus improved in the presence of MA-PP, which indicated much better interfacial adhesion between the PP matrix and wood flour filler than in the absence of compatibilizer. Morphological feature based on SEM observation showed that MA-PP and MA-EPDM improved the dispersion of the wood particles in the plastic matrix. MA-EPDM is a soft segment, although it improved the interfacial adhesion, storage modulus decreases with adding of MA-EPDM. As compatibilizer of wood-flour/polypropylene composites, both DMA analysis and SEM feature proved that MA-PP was superior to MA-EPDM. 展开更多
关键词 Wood flour POLYPROPYLENE COMPOSITES dynamic-mechanical analysis
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A New Method of Shock Dynamic Analysis of Multi-degree-of-freedom Systems
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作者 邹光荣 吴辉 《Defence Technology(防务技术)》 SCIE EI CAS 2008年第2期95-99,共5页
A new method is presented to analyze multi-degree-of-freedom (MDOF) dynamic systems subjected to an external shock excitation. A two-degree-of-freedom theoretical system with linear characteristics is exemplified to i... A new method is presented to analyze multi-degree-of-freedom (MDOF) dynamic systems subjected to an external shock excitation. A two-degree-of-freedom theoretical system with linear characteristics is exemplified to illustrate the procedure of this method. The equations of motion of the dynamic system are established via matrix method. The dynamic responses of the dynamic system under an external shock excitation of a half-sine type are obtained by MATLAB and ANSYS. It is proved that the new method is helpful to analyze MDOF dynamic systems. 展开更多
关键词 固体力学 冲击力 动力分析 MDof 数字方法
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DYNAMICS ANALYSIS OF 2-DOF SPHERICAL PARALLEL MECHANISM 被引量:2
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作者 李成刚 王化明 朱剑英 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2009年第2期95-100,共6页
The analytical formulations of the velocity and the acceleration of a 2-DOF spherical parallel mechanism are derived by the screw theory. Based on building its dynamics model by the principle of virtual work and recip... The analytical formulations of the velocity and the acceleration of a 2-DOF spherical parallel mechanism are derived by the screw theory. Based on building its dynamics model by the principle of virtual work and reciprocal product of the screw, the equation of the motor moment is obtained. Through the transformation of dynamics model, the configuration space method of the dynamics equation and the corresponding coefficients are presented. Finally, the result of an example shows that the inertia moment and the gravity play a more important role than the coriolis and centrifugal moment, and the former is ten times of the latter in the magnitude. So, the latter can be neglected only when the velocity of mechanism is very slow. 展开更多
关键词 KINEMATICS MECHANICS dynamics analysis screw theory spherical parallel mechanism
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Design and dynamic analysis of a scissors hoop-rib truss deployable antenna mechanism 被引量:1
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作者 Bo Han Xiangkun Li +3 位作者 Jian Sun Yundou Xu Jiantao Yao Yongsheng Zhao 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第6期399-413,共15页
As the support mechanism of space-borne antennas,space deployable antenna mechanism belongs to complex multi-closed-loop coupling mechanism,configuration design and dynamic analysis are more difficult than general par... As the support mechanism of space-borne antennas,space deployable antenna mechanism belongs to complex multi-closed-loop coupling mechanism,configuration design and dynamic analysis are more difficult than general parallel mechanism.In this paper,an unequal-length scissors mechanism(ULSM)is proposed by changing the position of the internal rotational joint through a basic scissors mechanism.A scissors hoop-rib truss deployable antenna mechanism(SHRTDAM)is constructed by replacing the parabolic rib with the ULSM.Kinematic analysis of SHRTDAM is conducted,and the degree of freedom(DOF)of the whole antenna mechanism is analyzed based on screw theory,the result showed that it has only one DOF.Velocity and acceleration characteristics of SHRTDAM are obtained by the screw derivative and rotation transformation.Based on Lagrange equation,dynamic model of this mechanism is established,the torque required to drive the mechanism is simulated and verified by Adams and MATLAB software.In addition,a ground experiment prototype of 1.5-m diameter was fabricated and a deployment test is conducted,which demonstrated the mobility and deployment performance of the whole mechanism.The mechanism proposed in this paper can provide a good reference for the design and analysis of large aperture space deployable antennas. 展开更多
关键词 Scissors mechanism Deployable antenna Screw theory Kinematic analysis dynamic analysis
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Application of Grey System to Rock Dynamic Mechanics Field Under Blasting Loading
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作者 刘殿书 赵红平 +1 位作者 陈寿峰 谢夫海 《International Journal of Mining Science and Technology》 SCIE EI 1999年第1期64-68,共5页
It is the key problem to be solved ror the development of Lagrange analysis bow to ase limited Lagrangian gauges and calculate the main information about the dynamic mechanical property of rock under blasting loading.... It is the key problem to be solved ror the development of Lagrange analysis bow to ase limited Lagrangian gauges and calculate the main information about the dynamic mechanical property of rock under blasting loading. This paper, using grey system, sets up a GM (1, 1 ) model relatal wltk characeristic time, and a theoretical analysis about tbe dynamic mechanical property has been carried out.The result of numerical simulation proves that the model is effective and feasible. 展开更多
关键词 LAGRANGE analysis GREY system dynamic MECHANICS
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Unascertained Factor Method of Dynamic Characteristic Analysis for Antenna Structures
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作者 朱增青 梁震涛 陈建军 《Defence Technology(防务技术)》 SCIE EI CAS 2008年第3期167-172,共6页
The dynamic characteristic analysis model of antenna structures is built,in which the structural physical parameters and geometrical dimensions are all considered as unascertained variables.And a structure dynamic cha... The dynamic characteristic analysis model of antenna structures is built,in which the structural physical parameters and geometrical dimensions are all considered as unascertained variables.And a structure dynamic characteristic analysis method based on the unascertained factor method is given.The computational expression of structural characteristic is developed by the mathematics expression of unascertained factor and the principles of unascertained rational numbers arithmetic.An example is given,in which the possible values and confidence degrees of the unascertained structure characteristics are obtained.The calculated results show that the method is feasible and effective. 展开更多
关键词 计算数学 固体力学 结构动力学 性状分析
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Mechanics analysis of a wheelchair robot with wheel-track coupling mechanism 被引量:3
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作者 李敬一 白阳 +2 位作者 靳飞 王冬晓 高学山 《Journal of Beijing Institute of Technology》 EI CAS 2013年第3期301-307,共7页
A barrier-free wheelchair robot with a mechanism coupled by wheel and track is presen- ted in this paper. Using the wheelchair, the lower limb disabled persons could be more relaxed to take part in outdoor activities ... A barrier-free wheelchair robot with a mechanism coupled by wheel and track is presen- ted in this paper. Using the wheelchair, the lower limb disabled persons could be more relaxed to take part in outdoor activities whether on flat ground or stairs and obstacles in the city. The wheel- track coupling mechanism is designed and the stability of the bodywork of the wheelchair robot on the stairs is analyzed. In order to obtain the stability of wheelchair robot when it climbs obstacles, centroid projection method is applied to analyze the static stability, stability margin is proposed to provide the stability under some dynamic forces, and the push rod rotation angle in terms of the guaranteed stability margin is given. Finally, the dynamic model of the wheelchair robot based on Lagrange equation is established, which can be a theoretical foundation for the wheelchair control system design. 展开更多
关键词 wheelchair robot wheel/track coupling mechanism centroid projection method sta-bility margin dynamic analysis
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Theoretical analysis of thermoviscoelastic contact between friction lining and wire rope in mine friction hoists 被引量:2
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作者 PENG Yu-xing ZHU Zhen-cai CHEN Guo-an 《Mining Science and Technology》 EI CAS 2009年第4期518-521,共4页
Serious accidents of mine hoists caused by high-speed sliding between friction lining and wire rope are often seen in coal mines.In order to solve this problem,we analyzed the contact characteristics between friction ... Serious accidents of mine hoists caused by high-speed sliding between friction lining and wire rope are often seen in coal mines.In order to solve this problem,we analyzed the contact characteristics between friction lining and wire rope.Then we carried out a dynamic mechanical analysis(DMA) to explain the change in mechanical properties of the friction lining as function of temperature and load frequency and found that temperature has a stronger effect on the mechanical properties than the frequency.We used multiple regression analysis to obtain the thermoviscoelastic constitutive relations of the friction lining.As well we derived the analytic solution for the thermoviscoelastic contact radius and pressure by combining the theory of viscoelastic contact mechanics with thermoviscoelastic constitutive relations. 展开更多
关键词 contact mechanics THERMOVISCOELASTICITY friction lining dynamic mechanical analysis mine hoist
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Dynamics and intermittent stochastic stabilization of a rumor spreading model with guidance mechanism in heterogeneous network 被引量:1
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作者 Xiaojing Zhong Yukun Yang +2 位作者 Runqing Miao Yuqing Peng Guiyun Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第4期96-108,共13页
We propose a novel rumor propagation model with guidance mechanism in hetero geneous complex networks.Firstly,the sharp threshold of rumor propagation,global stability of the information-equilibrium and information-pr... We propose a novel rumor propagation model with guidance mechanism in hetero geneous complex networks.Firstly,the sharp threshold of rumor propagation,global stability of the information-equilibrium and information-prevailingequilibrium under R_(0)<1 and R_(0)>1 is carried out by Lyapunov method and LaSalle's invariant principle.Next,we design an aperiodically intermittent stochastic stabilization method to suppress the rumor propagation.By using the Ito formula and exponential martingale inequality,the expression of the minimum control intensity is calculated.This method can effectively stabilize the rumor propagation by choosing a suitable perturb intensity and a perturb time ratio,while minimizing the control cost.Finally,numerical examples are given to illustrate the analysis and method of the paper. 展开更多
关键词 guidance mechanism heterogenous network global dynamic analysis aperiodically intermittent stochastic stabilization
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一种双电机驱动的无人机机械爪结构设计与有限元分析
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作者 盛敬 吴树良 +1 位作者 刘国满 马欣 《南昌工程学院学报》 2025年第1期54-61,68,共9页
针对传统的无人机抓取系统多采用单一电机驱动,存在响应速度慢、抓取角度单一、对物体的形状适应性差等问题,通过理论计算和SolidWorks建模设计了一种抓取角度可调、形状适应性强、双电机驱动的飞行机械爪。首先对动力装置、传动装置和... 针对传统的无人机抓取系统多采用单一电机驱动,存在响应速度慢、抓取角度单一、对物体的形状适应性差等问题,通过理论计算和SolidWorks建模设计了一种抓取角度可调、形状适应性强、双电机驱动的飞行机械爪。首先对动力装置、传动装置和抓取装置三部分进行结构设计;然后通过ANSYS Workbench进行推拉曲柄和机架的静强度分析和寿命测试,对传动齿轮进行瞬态分析和齿根弯曲强度分析,拟合了迭代次数内摩擦应力变化。结果显示零件所受应力均小于材料的屈服强度,寿命达到持续运行下的工况要求;验证了机械爪的强度可靠性和材料合理性。 展开更多
关键词 双电机驱动 飞行机械爪 结构设计 静力学分析 瞬态动力学分析
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基于拉格朗日反分析法的砂岩动态力学特性
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作者 张子健 陈骏 +3 位作者 朱锐 余浩然 李冉鑫 张渊通 《爆炸与冲击》 北大核心 2025年第3期24-36,共13页
为深入研究深部地层中砂岩在冲击荷载作用下的动态力学特性,建立了一种改进的霍普金森压杆实验系统,对灰砂岩长杆试件开展了不同加载速率的动态压缩实验,并结合高速数字图像相关技术(DIC)监测试件表面位移场和应变场的演化过程,探讨了... 为深入研究深部地层中砂岩在冲击荷载作用下的动态力学特性,建立了一种改进的霍普金森压杆实验系统,对灰砂岩长杆试件开展了不同加载速率的动态压缩实验,并结合高速数字图像相关技术(DIC)监测试件表面位移场和应变场的演化过程,探讨了灰砂岩在近场冲击加载下的拉伸破坏的规律。从DIC分析得到的位移场中提取出不同质点位移时程曲线,进行了拉格朗日反分析算法计算,获得了灰砂岩材料的全场应力-应变规律。结果表明:灰砂岩长杆试件以拉伸破坏为主,且出现了近加载端破碎、远离加载端层裂的现象;灰砂岩长杆试件的动态抗压强度因子随应变率增大而增大,有明显的应变率效应;随着加载速率升高,各测点应力峰值与应变峰值均呈增大趋势;在同一加载速率下,灰砂岩长杆的应力-应变曲线呈现出近端测点曲线包络远端测点曲线的现象。 展开更多
关键词 动态力学特性 数字图像相关法 拉格朗日反分析 砂岩 动态强度增强因子
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局部放电中声波产生机理及仿真分析
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作者 王巍然 安志武 《应用声学》 北大核心 2025年第2期489-496,共8页
局部放电是电力设备安全运行的严重隐患。超声法可以探测局部放电发出的声波并定位声源,是一种被广泛应用的检测手段。为了更加准确地描述局部放电产生超声波的机理和过程,该文针对电晕放电这一典型的局部放电现象在理论上分析了其产生... 局部放电是电力设备安全运行的严重隐患。超声法可以探测局部放电发出的声波并定位声源,是一种被广泛应用的检测手段。为了更加准确地描述局部放电产生超声波的机理和过程,该文针对电晕放电这一典型的局部放电现象在理论上分析了其产生声波的机理。该理论基于流体动力学理论,将带电粒子的连续性方程、电场泊松方程和有源声波方程进行耦合,并利用有限元仿真求解出了声场分布。结果表明:声源附近处的声波频率和放电电流脉冲频率保持一致;声波具有较强的指向性,针尖正下方的声场明显强于其他方向;随着传播距离的增大,声波出现明显衰减,且高频分量衰减更快,表现为峰值频率向低频漂移;放电电流脉冲幅值、声压大小和峰值频率均和外接电压幅值呈正相关。相关结果能较好地明晰电学量与声学量之间的关系,为局部放电超声检测法的定量化研究提供一定帮助。 展开更多
关键词 局部放电 电晕放电 发声机理 仿真分析 流体动力学模型
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Taylor撞击实验及其应用研究进展
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作者 敬彬 胡文军 陶俊林 《材料导报》 北大核心 2025年第2期210-219,共10页
材料在冲击、爆炸等高应变率加载情况下的动态塑性力学行为与静载下有着显著区别,正确认识材料动态力学行为是建立准确可靠的材料动态本构模型和数值模拟的重要基础。Taylor撞击实验是一种表征材料动态力学行为的经典实验技术,在军事、... 材料在冲击、爆炸等高应变率加载情况下的动态塑性力学行为与静载下有着显著区别,正确认识材料动态力学行为是建立准确可靠的材料动态本构模型和数值模拟的重要基础。Taylor撞击实验是一种表征材料动态力学行为的经典实验技术,在军事、航天和核能等领域发挥着重要作用,为相关技术的改进和优化提供了有力支持。本文简要回顾了经典一维理论模型、弹塑性波传播、数值模拟和动态本构关系在Taylor撞击实验中的研究进展。分别对Taylor撞击实验的理论发展、实验技术的发展和Taylor撞击实验的应用进行详细介绍。最后探讨分析了Taylor撞击实验研究的重点、难点和今后研究的方向,为工程实践和相关问题的解决提供参考。 展开更多
关键词 Taylor撞击实验 动态力学行为 一维分析模型 动态本构模型 弹塑性波传播
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织物内增强TPO防水卷材的分析和比较
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作者 姜广明 丁晓晨 +3 位作者 刘广 刘志维 韩忠强 胡水 《工程质量》 2025年第3期12-16,21,共6页
论文研究了两种织物内增强型TPO防水卷材的成分和性能,不同TPO防水卷材产品的TPO材料含量、填料含量、阻燃剂含量不同,TPO材料中PP和PE的比例也不同。两种TPO防水卷材的拉伸性能都满足国家标准的规定,热老化后拉伸性能的保持率也能达到... 论文研究了两种织物内增强型TPO防水卷材的成分和性能,不同TPO防水卷材产品的TPO材料含量、填料含量、阻燃剂含量不同,TPO材料中PP和PE的比例也不同。两种TPO防水卷材的拉伸性能都满足国家标准的规定,热老化后拉伸性能的保持率也能达到国家标准的要求。比较这2种TPO防水卷材,FSJC-1样品的热老化性能保持率和颜色保持性要优于FSJC-3样品。 展开更多
关键词 织物内增强 热塑性聚烯烃 防水卷材 动态热机械分析 拉伸性能 热老化
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基于Adams二次开发的导气式转膛自动机动力学建模与分析
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作者 丁传俊 郭飞 +1 位作者 李浩 孙天云 《兵器装备工程学报》 北大核心 2025年第1期63-68,共6页
为了提高导气式转膛自动机发射动力学模型的建模准确性和效率,提出了2种基于Adams二次开发的建模方法。通过综合利用Sfosub、Sysfnc和Reqsub子程序,实现内弹道和导气室参数在Adams中的耦合求解和对外输出。通过编写建模宏命令,一次性地... 为了提高导气式转膛自动机发射动力学模型的建模准确性和效率,提出了2种基于Adams二次开发的建模方法。通过综合利用Sfosub、Sysfnc和Reqsub子程序,实现内弹道和导气室参数在Adams中的耦合求解和对外输出。通过编写建模宏命令,一次性地完成三维模型导入、铰与接触建立、内弹道子程序调用和提交计算等全部建模操作,极大地提高了建模效率。结果显示该方法建模效率高,能够反映自动机实际运动规律,具备推广应用价值。 展开更多
关键词 兵器科学与技术 ADAMS 二次开发 导气式转膛自动机 动力学建模
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GSM-R进路预告故障自动分析系统的设计与实现
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作者 戴俊勉 许全利 +1 位作者 胡江云 崔成 《铁道通信信号》 2025年第1期64-69,共6页
针对当前GSM-R进路预告业务故障分析覆盖面窄、工作效能低的现状,研究进路预告业务工作原理、GSM-R接口监测数据,分析铁路局相关设备运维工作要求。利用决策树算法、大数据分析和云计算技术,设计开发GSM-R进路预告故障自动分析系统,实... 针对当前GSM-R进路预告业务故障分析覆盖面窄、工作效能低的现状,研究进路预告业务工作原理、GSM-R接口监测数据,分析铁路局相关设备运维工作要求。利用决策树算法、大数据分析和云计算技术,设计开发GSM-R进路预告故障自动分析系统,实现进路预告故障动态监测、原因自动分析、故障闭环管理和业务指标统计等功能。该系统在测试期间,未发生数据丢失和软硬件故障,进路预告故障动态监测和业务指标统计准确率达到100%,故障原因自动分析正确率大于95%,为GSM-R进路预告业务运用质量提升和同类系统开发、升级提供参考。 展开更多
关键词 GSM-R 进路预告 接口监测数据 故障动态监测 故障自动分析
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Design of a Non-cooperative Target Capture Mechanism 被引量:2
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作者 WANG Chen NIE Hong +1 位作者 CHEN Jinbao PAN Zhengwei 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2019年第1期146-153,共8页
A passive compliant non-cooperative target capture mechanism is designed to maintain the non-cooperative target on-orbit. When the relative position between capture mechanism and satellite is confirmed,a pair of four-... A passive compliant non-cooperative target capture mechanism is designed to maintain the non-cooperative target on-orbit. When the relative position between capture mechanism and satellite is confirmed,a pair of four-bar linkages lock the docking ring,which is used for connecting the satellite and the rocket. The mathematical model of capture mechanism and capture space is built by the Denavit-Hartenberg(D-H)method,and the torque of each joint is analyzed by the Lagrange dynamic equation. Besides,the capture condition and the torque of every joint under different capture conditions are analyzed by simulation in MSC. Adams. The results indicate that the mechanism can capture the non-cooperative target satellite in a wide range. During the process of capture,the passive compliant mechanism at the bottom can increase capture space,thereby reducing the difficulty and enhance stability of the capture. 展开更多
关键词 NON-COOPERATIVE target passive COMPLIANCE CAPTURE MECHANISM KINEMATICS analysis dynamics analysis
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Physical and damping properties of kenaf fibre filled natural rubber/thermoplastic polyurethane composites 被引量:4
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作者 A.M.Noor Azammi S.M.Sapuan +1 位作者 Mohamad R.Ishak Mohamed T.H.Sultan 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2020年第1期29-34,共6页
The paper presents the investigation of the effect of alkaline treatment of sodium hydroxide(NaOH) on physical and dynamic mechanical analysis(DMA) viscoelastic properties of kenaf fibre filled natural rubber(NR)/ther... The paper presents the investigation of the effect of alkaline treatment of sodium hydroxide(NaOH) on physical and dynamic mechanical analysis(DMA) viscoelastic properties of kenaf fibre filled natural rubber(NR)/thermoplastic polyurethane(TPU) composites.The treated kenaf fiber,NR and TPU were weighed and proportioned according to the required compositions and were blended using hot mixed Brabender machine.The polymer composites were then fabricated using the hot press to form a sample board.The sample was cut and prepared and water absorption,density,thickness swelling and DMA tests were performed.As far as physical properties are concerned,composites with the highest NR amount of shows the best results,which indicates good fiber bonding adhesion.The polymer composites with the highest amount of TPU shows the highest damping properties at high temperature. 展开更多
关键词 KENAF fiber ALKALINE treatment THERMOPLASTIC POLYURETHANE Natural rubber dynamic mechanical analysis
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