Papers by Keyword: Rubber

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Authors: Zhi Min Xie, Jing Zhang, You Shan Wang
Abstract: The rubbery materials play an important role in the acoustic metamaterials composed of locally resonant structures. To determine the unusual behavior of the dynamic mass density and bulk modulus in acoustic metamaterials in detail, better understanding of the viscoelasticity of rubbery materials is necessary. In the present work, we demonstrated the difference between the fractional and integer constitutive models in describing the viscoelastic behaviors in terms of the natural rubber (NR) and silicone rubber (SR). Test results for the relaxation modulus show that the Maxwell model is not suitable for NR and SR. The fractional Scott-Blair model gave a better estimation for the relaxation modulus but had a more sophisticated relation than the classical Maxwell model did. Compared with the other constitutive models, the fractional Maxwell model gave a better description of the mechanical properties for NR and SR, but it involved four independent parameters to be determined experimentally. By fitting test results in the double logarithmic plot of the modulus and loading time, all the parameters of the fractional Maxwell model were obtained. The present work provided a base for the analysis of the membrane-type acoustic metamaterials.
Authors: Ya Bin Chen
Abstract: This paper is devoted to the analysis of frictional contact problems with large deformations and displacements between hyper-elastic body and rigid body. The material nonlinearity and contact nonlinearity are separated and, the geometrically nonlinear behavior is described by the total Lagrange formulation. The Coulomb friction law is employed to simulate the friction between rigid vessel and rubber by the use of augmented Lagrange approach with node-to-segment formulation. A formulation of finite element is taken in this paper to describe the frictional contact problem, which is solved by the Newton-Raphson iterative procedure. It is shown that the augmented Lagrange technique significantly avoids locking and over-constraining and provides optimal convergence rate. Finally, the numerical results show that the accuracy and efficiency of augmented Lagrange approach in modeling large deformation frictional contact problem.
Authors: Xiao Bo Wang, Chuan Sheng Wang
Abstract: Detecting carton black is the basis of evaluating carton black’s dispersion, which is important for researching mixing process. Considering the difference of gray between rubber and carton black, K-Means algorithm was adopted to recognize carton black. With the consideration of some deviations where using K-Means algorithm to recognize carton black with small size, rubber image was optimized on the basis of inflection point. Application of optimizing rubber image and K-Means algorithm improves the accuracy of detecting carton black, which supplies support for evaluating carton black’s dispersion precisely.
Authors: Xiao Bo Wang, Chuan Sheng Wang
Abstract: Distinguishing carton black and impurity is important for evaluating carton black’s dispersion in rubber. There are two types of impurities, filamentous impurity and scratch. According to the characteristics of filamentous impurity, the ratio of perimeter to solidity of region and hole’s area were calculated to distinguish this type of impurity. If hole’s area was larger than 3 or the value of the ratio larger than 160, the region was regarded as filamentous impurity. Scratch was very like line, which could be identified by the way of hough translation. The treatment of impurities based on morphology is helpful for improving the accuracy of detecting carton black and calculating carton black’s dispersion.
Authors: Xiao Bo Wang, Chuang Sheng Wang
Abstract: It’s important to recognize carton black in rubber image for detecting carton black dispersion. This new method adopts special algorithm that depends on rubber image’s character to optimize background color of rubber image and make carton black clearer. In addition, this method can distinguish some abnormal factors through calculating oblate degree of white region. Application of this new method is useful for getting exact information of carton black and supplying correct data for evaluating carton black dispersion.
Authors: Ming Tian, You Ping Wu, Wen Li Liang, Li Jun Cheng, Li Qun Zhang
Authors: Ahmad Azrem Azmi, Mohd Mustafa Al Bakri Abdullah, Che Mohd Ruzaidi Ghazali, Andrei Victor Sandu, Kamarudin Hussin
Abstract: This paper aims to investigate the potential use of recycled tire rubber in concrete. In Malaysia, rubber consumption of tires in January – June 2014, rose up to 8.4% from 0.388 million tonnes. These numbers keep on increasing year-over-year with the numbers of vehicles, as do the future problems relating to waste tires. Over the past few years, a number of researchers have studied on incorporated the waste tires into cement based materials. In an attempt to reduce the magnitude of this issue, recycled tire rubber has gained interest in concrete improvement. The used of recycled tire rubber in the reinforcement in concrete is considered as value added materials for sustainable development by reusing waste materials. It is believed that using waste tire rubber in concrete could be an alternative way to replace fine and coarse aggregate (sand and gravel) in improving the properties of concrete. Rubberized concretes can be used in architectural applications such as side walk pavement, nailing concrete, in road constructions where high strength is not necessary, outdoor playground mat, in wall panels that require low unit weight, in sound barriers as sound absorbers, and in railroads to fix the rails to the ground.
Authors: Ahmad Azrem Azmi, Mohd Mustafa Al Bakri Abdullah, Che Mohd Ruzaidi Ghazali, Andrei Victor Sandu, Kamarudin Hussin, Donny Arief Sumarto
Abstract: Utilization of waste materials such as waste tire rubber in the building industry can help prevent environmental pollution whilst contributing to the design of more economical buildings. Preliminary studies show that workable rubberized portland cement concrete mixtures can be made provided that appropriate percentages of tire rubber are used in such mixtures. This article provides the overview of some of published paper using tire waste rubber in portland cement concrete. The researchers mostly investigated the properties of fresh and hardened concrete. The workability, density, air content, unit weight, compressive strength, modulus of elasticity, freezing and thawing resistance, abrasion resistance and thermal properties of the waste tire rubber in concrete were discussed.
Authors: Wen Hao Hsing, Chuang Ting Yeh, Ming Cheng Lin
Abstract: In this study, to change the proportion of 20%、21% RFL solution content, and in which compounds were added 7%, 8% of the IL-6 conditions, in the different EP100, EP200, EP300 fabrics, testing adhesion strength the changes between of fabric and fabric, fabric and rubber, respectively, for different concentrations under the conditions, observed in viscosity variations of the RFL solution. The results indicate that, the viscosity of RFL solution will increase with the ratio improve and the concentration of IL-6 conditions, in 21% RFL solution content and adding 8% of the IL-6 can reach the best results, EP 100 fabric and fabric of the adhesion strength is 21.24kgf, the adhesion strength of fabric and rubber is 28.09 kgf.
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