Sutthinane Nilbuaklee¹, Chanyut Kolitawong¹, Banpot Horbanluekit^1,2

The International Conference on Computational & Experimental Engineering and Sciences, Vol.13, No.1, pp. 4-10, 2009, DOI:10.3970/icces.2009.013.004

Abstract The purpose of this research is to determine fracture effects of vulcanize elastomer at various thickness to width ratios under opening mode fracture mechanics. The J-integral values from finite element method are compared with those from experiment. In this research, fracture tests perform under Single Edge Notch Tensile (S.E.N.T) tests using the multiple-specimen method. Compare to the experimental data, the numerical results are acceptable at the deep crack length, i.e. high crack length to width ratio. The k values from the 3-D numerical calculation show that thin sheet is dominated by plane stress state, but thick sheet is dominated by… More >

M. Uchida¹, N. Tada¹, Y. Tomita²

The International Conference on Computational & Experimental Engineering and Sciences, Vol.6, No.2, pp. 91-98, 2008, DOI:10.3970/icces.2008.006.091

Abstract Micro- to mesoscopic deformation behavior of semi-crystalline polymer with randomly distributed rubber particles is evaluated by numerical simulation. In this model, dimension of mesostructure is identified by volume fraction of interface region around the rubber particles. The effects of strain rate and size of mesostructure on macroscopic stress-strain relation and strain distribution in mesoscopic area are discussed. In the earlier stage of deformation, the slope of stress-strain relation changes by rubber particle size while stress in the following deformation is mainly affected by the tensile strain rate. The anisotropic deformation in lamellar oriented interface region causes change in the strain… More >

A. Takahashi¹, K. Motoyama², K. Misaji^1,*

The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.2, pp. 42-42, 2019, DOI:10.32604/icces.2019.05446

Abstract Seismic isolation laminated rubber is used as an effective means for suppressing damage to buildings and people in buildings by earthquakes. The restoring-force characteristic of the rubber has non-linerar-vibration characteristics which depend on the displacement amplitude. PFT-ELS (Equivalent linear system using the restoring force model of power function type) has been applied for calculating approximate responses of various non-linear-vibration systems [Kazuhito, M., et al. (1994); Koichi, S., et al. (1995); Koichi, S., et al. (1996)]. The authors have also applied to optimize the non-linear vibration characteristics of the isolation rubber using PFT-ELS and GA [Ayumi, T., et al. (2017)]. However,… More >

V. Subrahmanian^1,*, M. Albert Noble Einstien²

Journal of Renewable Materials, Vol.7, No.2, pp. 171-192, 2019, DOI:10.32604/jrm.2019.00090

Abstract Nowadays an alternate source of filler from renewable and plant derivatives are being thought of in rubber industries due to their reliability, environmental and economic benefits. Rice Husk Ash (RHA) a byproduct of the rice milling industry is obtained on partial and as well as full combustion of the rice husks. This ash is a good source of silica, silicates and needle shaped carbon and hence can be used as filler for cements. In the present study, a detailed investigation was carried out to understand the RHA as reinforcing material using mechanical properties and fractography using SEM. The rubbers studied… More >

Marcin Masłowski*, Justyna Miedzianowska and Krzysztof Strzelec

Journal of Renewable Materials, Vol.6, No.7, pp. 746-754, 2018, DOI:10.32604/JRM.2018.00121

Abstract Novel elastomer biocomposites based on straw fibers (raw or chemically modified) as reinforcing elements of natural rubber (NR) were reported and studied. Oat straw fibres with different average lengths were used. Lignocellulose materials were incorporated into the elastomer, before and after chemical surface modification involving sodium hydroxide. Fourier transform infrared spectroscopy (FTIR) and microscopy techniques were employed for characterization of fillers. The kinetics of rubber mixtures, as well as rheometric properties of compounds were determined. The cross-linking density was executed on the basis of equilibrium solvent-swelling measurements applying the modified Flory–Rehner equation. The morphology of biocomposites samples was analyzed by… More >

Ewa Głowińska*, Janusz Datta, Paulina Parcheta and Natalia Kaźmierczak

Journal of Renewable Materials, Vol.6, No.7, pp. 680-687, 2018, DOI:10.32604/JRM.2018.00003

Abstract The aim of this work was to investigate the influence of Spirulina (Spirulina platensis) as a natural filler on the curing characterization, morphology and mechanical, thermomechanical and thermal properties of natural rubber (NR) based composites. Spirulina was introduced into NR mixture in amount of 0 phr, 10 phr and 30 phr. The vulcanization process was carried out at the determined process condition by using hydraulic press at optimum vulcanization time (t90). It was noticed that Spirulina affected on the reduction of t90, and scorch time (t2) of the NR mixtures. Obtained vulcanizates were subjected to the number of tests e.g.… More >

Nikolay Dishovsky^1*, Petrunka Malinova¹, Ivan Uzunov²

Journal of Renewable Materials, Vol.6, No.4, pp. 402-412, 2018, DOI:10.7569/JRM.2017.634171

Abstract Natural products from agricultural wastes are finding importance in the polymer industry due to their many advantages such as being lightweight, low cost and environmentally friendly. In the present study the potential of the two types of rice husk ash (RHA) prepared under different conditions as fillers in natural rubber-based elastomer composites was investigated. The fillers were prepared by rice husks incineration and characterized by means of X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET) specific surface area, Hg-porosimetry and N2-adsorption. The evaluation involved determining the vulcanization characteristics of the compounds and their… More >

TK. N. Tran^1,2, A. Guyomard-Lack³, C. Cerclier³, B. Humbert³, G. Colomines¹, J-F. Pilard², R. Deterre¹, J. Le Bideau^3,*, E. Leroy^4,*

Journal of Renewable Materials, Vol.6, No.3, pp. 251-258, 2018, DOI:10.7569/JRM.2017.634174

Abstract Natural rubber (NR), besides being an abundant renewable resource for the elastomer industry, can be a potential resource for the design of innovative biobased polymer networks. The present work is based on "telechelic" liquid natural rubber oligomers obtained by controlled chemical degradation of NR. The chain ends of such oligomers can then be functionalized (with acrylate functions in the present case) and reacted with multifunctional crosslinkers in order to form networks. What's more, the initial solubility of such thermosetting system in an ionic liquid (IL) can be used for the formulation of ionogels. Such solid networks typically containing 80% of… More >

E. Ferretti¹

CMC-Computers, Materials & Continua, Vol.31, No.2, pp. 87-112, 2012, DOI:10.3970/cmc.2012.031.087

Abstract The present study follows a previous study on the stress and strain profiles along the cross-section of waste tire rubberized concrete plates for airport pavements, subjected to quasi-static loads [Ferretti and Bignozzi (2012)]. Further results on the in-situ performance of concrete plain and rubberized taxiways have been collected and presented here. The experimental program has been undertaken at the Guglielmo Marconi airport of Bologna (Italy). It concerns two portions of the taxiway, one built with plain concrete and one with rubberized concrete. Each portion has been fitted with strain gauges embedded in concrete for the acquisition of vertical strains. More >

E. Ferretti

CMC-Computers, Materials & Continua, Vol.30, No.3, pp. 237-284, 2012, DOI:10.3970/cmc.2012.030.237

Abstract The procedure of the effective law outlined in this paper [Ferretti (2001); Ferretti and Di Leo (2003); Ferretti (2004b)] is an experimental procedure for identifying the constitutive law in uniaxial compression of brittle heterogeneous materials, and is based on the physical, analytical and numerical discussions about the existence or otherwise of strain-softening [Ferretti (2004a); Ferretti (2005)]. This procedure allows us to correct several incongruities that characterize the average stress versus average strain diagrams: it produces evidence against strain-softening in uniaxial compression [Ferretti (2004b)], whose existence may be questioned from a physical point of view [Ferretti (2004a); Ferretti (2005)], it provides… More >