scholarly journals Research on Extrusion of Rubber Composites Reinforced by Short Fibers Orientation Based on FEA

2018 ◽  
Vol 38 ◽  
pp. 02022
Author(s):  
Dewei Zhang ◽  
Chuansheng Wang ◽  
Bo Shen ◽  
Shaoming Li ◽  
Huiguang Bian
Keyword(s):  
Flow Field ◽  
Extrusion Process ◽  
Short Fiber ◽  
Rubber Matrix ◽  
Real Problem ◽  
Short Fibers ◽  
Rubber Composites ◽  
Field Velocity ◽  
Fibers Orientation ◽  
Cut Resistance

In recent years, rubber composites reinforced by short fibers has been researched deeply, because of its good performances such as higher wear resistance, higher cut resistance and so on. Some research results indicated that if short fibers get orientation in rubber composites, the performances of rubber products could be promoted greatly. But how to make short fibers get orientation in rubber matrix during extrusion is still a real problem. And there are many parameters affect the short fibers orientation. So, in this paper, the effects of die structure including expansion-die and dam-expansion-die on extrusion flow field of short fiber and rubber composite material during extrusion process has been researched by Polyflow. And the FEA results about the pressure field, velocity field and the velocity vector of the rubber composites flow field indicate that, comparing with expansion-die and the dam-expansion-die, the latter one is better for the extrusion process of rubber composites and making short fibers get radial orientation in rubber matrix.

scholarly journals FEA of flow field of short fiber and rubber composite material during extrusion process

2018 ◽  
Vol 153 ◽  
pp. 022019
Author(s):  
D W Zhang ◽  
C S Wang ◽  
B Shen ◽  
C P Chen ◽  
S M Li ◽  
...  
Keyword(s):  
Composite Material ◽  
Flow Field ◽  
Extrusion Process ◽  
Short Fiber ◽  
Rubber Composite

Radial Orientation Mechanism and Research of Short Fiber in Extrusion Die

2012 ◽  
Vol 476-478 ◽  
pp. 2271-2279 ◽  
Author(s):  
Cai Jun Liu
Keyword(s):  
Mathematical Model ◽  
Fixed Point ◽  
Flow Field ◽  
Rigid Body ◽  
Extrusion Process ◽  
Short Fiber ◽  
Expansion Ratio ◽  
Mechanics Model ◽  
Extrusion Die ◽  
Radial Orientation

Combining with Jeffery equation and mechanics model of fixed point of Euler rigid body, research was done to study the mechanism and method of the short fiber radial orientation and characteristics of movement in tread extrusion process. The influence of tension flow field and shear flow field in flow channel on short fibers orientation has been systemically analyzed by flow characteristics of the tread during the extrusion process and combining with Jeffery equation and mechanics model of fixed point of Euler rigid body. The result show that the expansion ratio and the expanding angle of cross section are the key factors to determine the radial orientation of short fiber. Mathematical model of short fiber radial orientation was established. The extrusion die, which has a hinder dam by adopting such principle has been designed. The result also show that the best expansion ratio was 3-4, obtaining the average orientation angle between 70o-80o. and the rationality of the radial oriented mechanism and the mathematical model are verified.

Research on Vulcanization Process of Short Fiber-Rubber Composite Material

2012 ◽  
Vol 501 ◽  
pp. 325-329
Author(s):  
Chuan Sheng Wang ◽  
De Wei Zhang ◽  
Lei Guo ◽  
Xian Kui Zeng ◽  
Xiao Bo Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Physical And Mechanical Properties ◽  
Short Fiber ◽  
Short Fibers ◽  
Iron Wire ◽  
Rubber Composite ◽  
Fibers Orientation ◽  
Vulcanization Process

Vulcanization process is the last step of manufacturing rubber products. For tire tread which is made of short fiber rubber composite material, vulcanization is complex due to during vulcanization process the flow of mixed rubber maybe change short fibers orientation. As a result, during vulcanization process, several pieces of iron wire have been put in the mold to play the role of tire patterns for the first step research. The experimental results indicate that the flow of mixed rubber would not change short fibers orientation greatly, and physical and mechanical properties of short fiber-rubber composite material keep as good as that vulcanized without iron wire.

scholarly journals Common Origin of Filler Network Related Contributions to Reinforcement and Dissipation in Rubber Composites

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2534
Author(s):  
Sriharish Malebennur Nagaraja ◽  
Sven Henning ◽  
Sybill Ilisch ◽  
Mario Beiner
Keyword(s):  
Network Topology ◽  
Filler Content ◽  
Matrix Composition ◽  
Rubber Matrix ◽  
Butadiene Rubber ◽  
Rubber Composites ◽  
Different Temperatures ◽  
Filler Network ◽  
General Perspective ◽  
Rubber Filler

A comparative study focusing on the visco–elastic properties of two series of carbon black filled composites with natural rubber (NR) and its blends with butadiene rubber (NR-BR) as matrices is reported. Strain sweeps at different temperatures are performed. Filler network-related contributions to reinforcement (ΔG′) are quantified by the classical Kraus equation while a modified Kraus equation is used to quantify different contributions to dissipation (ΔGD″, ΔGF″). Results indicate that the filler network is visco-elastic in nature and that it is causing a major part of the composite dissipation at small and intermediate strain amplitudes. The temperature dependence of filler network-related reinforcement and dissipation contributions is found to depend significantly on the rubber matrix composition. We propose that this is due to differences in the chemical composition of the glassy rubber bridges connecting filler particles since the filler network topology is seemingly not significantly influenced by the rubber matrix for a given filler content. The underlying physical picture explains effects in both dissipation and reinforcement. It predicts that these glassy rubber bridges will soften sequentially at temperatures much higher than the bulk Tg of the corresponding rubber. This is hypothetically due to rubber–filler interactions at interfaces resulting in an increased packing density in the glassy rubber related to the reduction of free volume. From a general perspective, this study provides deeper insights towards the molecular origin of reinforcement and dissipation in rubber composites.

The Mechanical Behavior of Short-Fiber-Elastomer Composites

1976 ◽  
Vol 49 (5) ◽  
pp. 1167-1181 ◽  
Author(s):  
A. Y. Coran ◽  
P. Hamed ◽  
L. A. Goettler
Keyword(s):  
Test Piece ◽  
Composite Plates ◽  
Short Fiber ◽  
Strength Properties ◽  
Unidirectional Composite ◽  
Short Fibers ◽  
Principal Stresses ◽  
Elastomer Composites ◽  
Ultimate Limit ◽  
Time Of Failure

Abstract The measured elastic and strength properties of angle-ply composites of short fibers and rubber depend on test-piece geometry. In general, higher tensile moduli and strengths are obtained when plies are both thin and wide. Once the effects of test-piece geometry are taken into account, elastic properties can be calculated as functions of the properties of a single ply. Classical compliance transformation equations can be used. However, because of the invariance of shear modulus in aligned composites, the tensor transformation equations are somewhat simplified. Tensile strengths of off-axis unidirectional composite plates and balanced-angle plies can be fitted by Hill's criterion. Unidirectional composites tend to fail in the weakest mode, depending on the angle of stress, but laminating causes all principal stresses in a ply to be near their ultimate limit at the time of failure.

scholarly journals Machnical properties of short fiber-rubber composites.

1985 ◽  
Vol 58 (4) ◽  
pp. 224-231 ◽  
Author(s):  
MICHIO ASHIDA
Keyword(s):  
Short Fiber ◽  
Rubber Composites

Crack Resistance Function Analysis of Flexible Short Fiber in Asphalt

2011 ◽  
Vol 243-249 ◽  
pp. 4182-4187
Author(s):  
Zhi Yong Ding ◽  
Jing Liang Dai ◽  
Bo Peng
Keyword(s):  
Mechanical Model ◽  
Function Analysis ◽  
Short Fiber ◽  
Calculation Model ◽  
Tensile Failure ◽  
Spherical Coordinates ◽  
Short Fibers ◽  
Flexible Fiber ◽  
Fiber Bridging ◽  
Resistance Function

after reasonably analyzing characteristics of flexible fiber reinforcement fragile material, the mechanical model of individual fiber is established while being pulled out from asphalt; the spherical coordinates is adopted to establish the calculation model for short fiber bridging stress evenly distributed in space to calculate the value of bridging stress generated by short fibers while asphalt is breaking; the fiber asphalt sample in big size is adopted to perform low temperature tensile failure test to practically measure bridging stress of short fiber; fit the calculated value and measured value of bridging stress by adjusting parameters in the calculation model to check the rationality of fiber bridging stress in calculation method and model.

New Rotor with Variable Clearance in the Short Fiber Rubber Composite Mixing

2013 ◽  
Vol 328 ◽  
pp. 387-392
Author(s):  
Cai Jun Liu ◽  
Chuan Sheng Wang
Keyword(s):  
Production Efficiency ◽  
Short Fiber ◽  
Short Fibers ◽  
Mixing Chamber ◽  
Small Clearance ◽  
Rubber Composite ◽  
Mixing Quality ◽  
And Performance

The mixing mechanism of short fiber/rubber composite was analyzed. The clearance between the rotor edge peak and mixing chamber influenced mixing, dispersion and length of the short fibers in compound. The new rotor was designed with variable clearance. The large clearance gap improve the mixing, and the small clearance gap helped to improve the dispersion of short fiber. The mixing quality and performance of short fiber/rubber composite were improved by using the new rotor, and the production efficiency increased.

scholarly journals EFFECT OF SHORT FIBERS ORIENTATION ON MECHANICAL PROPERTIES OF COMPOSITE MATERIAL – FIBER REINFORCED CONCRETE

2017 ◽  
Vol 23 (8) ◽  
pp. 1091-1099 ◽  
Author(s):  
Vitalijs LUSIS ◽  
Andrejs KRASNIKOVS ◽  
Olga KONONOVA ◽  
Videvuds-Arijs LAPSA ◽  
Rimvydas STONYS ◽  
...  
Keyword(s):  
Fiber Reinforced Concrete ◽  
Fracture Mechanisms ◽  
Short Fibers ◽  
Structural Element ◽  
Fibre Concentration ◽  
Four Point Bending ◽  
Fibre Concrete ◽  
Simulation Results ◽  
Fibers Orientation ◽  
Short Steel Fibres

Traditional fiberconcrete structures have fibres in the mix oriented in all spatial directions, distributed in the struc­tural element volume homogenously, what not easy to obtain in practice. In many situations, structurally more effective is the insertion of fibres into the concrete structural element body by forming layers, with a predetermined fibre concentration and orientation in every layer. In the present investigation, layered fibre concrete is under investigation. Short steel fibres were at­tached to flexible warps with the necessary fibres concentration and orientation. Warps were placed into the prismatic mould separating them by concrete layers without fibres. Prisms were matured and tested under four-point bending. The bending-affected mechanical behaviour of cracked fibre concrete was simulated numerically by using a developed struc­tural model. Comparing the simulation results with experimental data, material micromechanical fracture mechanisms were analysed and evaluated.

Flow-field velocity measurements for nonisothermal systems

1991 ◽  
Author(s):  
Edward J. Johnson, Jr. ◽  
Paul V. Hyer ◽  
Paul W. Culotta ◽  
Ivan O. Clark
Keyword(s):  
Flow Field ◽  
Velocity Measurements ◽  
Field Velocity
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