This study is particularly focused on renewable materials of bio-composites. Our work draws on the extraction method and the mechanical characterisation of natural fibres of artichokes (Cyanara cardunculus L) which are produced naturally and in abundance in the northern regions of Algeria particularly so in the northeast. It also draws on the manufacturing of composite with bio-reinforcement models consisting of long fibres of laminated materials of the Cyanara cardunculus L type compiled with unsaturated polyester resin. Standardised sample test-pieces are then drawn from these models so as to carry out tensile and shear tests to evaluate their mechanical behaviour. Additionally, the diversity in characteristics necessitates the use of statistical approaches in order to estimate the proper Weibull parameters of natural fibres, based on a Weibull distribution.
The present study addresses the effect of attached mass on dynamic properties of composite laminate plates, under flexural vibration, for clamped-free-free-free boundary conditions. Furthermore, factors influencing the effect of attached mass on natural frequencies of laminate composite are studied using the Taguchi method. The considered factor parameters are: attached mass weight, attached mass locations from the clamped edge, staking sequences, and number of layers. The results of this study indicate that the dynamic characteristics of the laminate composite plates are sensitive to the attached mass, where the natural frequencies are found to be inversely proportional to the mass weight. The results was found that the locations of the attached mass and number of layers were the most important factors affecting the natural frequencies, where the location of the masses fell into the antinodes and into the nodal area of vibration, respectively. In addition, the paper presents a good correlation between the numerical results obtained by the ANSYS software and those obtained experimentally.
In this research, the compressive behavior of structures consisting of two types of cells were studied (honeycombs and re-entrant), in order to know the effect of the ratios of these cells on the mechanical properties of the structures. In addition, by controlling the Poisson’s ratio with a constant Young’s modulus, three types of structures (traditional honeycomb, auxetic and zero Poisson’s ratio (ZPR)) were obtained together with the ability to control their mechanical properties without changing the geometric properties of the cell. Numerical models were created and compared with the results obtained from the structures manufactured by the 3D printer experimentally, and where the Young’s modulus, Poisson factor and compressive deformation were close to the experimental results. In this current research, new structures have been proposed by incorporating traditional honeycomb cells with auxiliary honeycomb cells into a single structure without changing the cell geometry. The aim was to control the Poisson’s ratio in order to obtain all types of structures mentioned above without changing the geometric properties of the cell.
In this paper, we propose a quick and easy method to investigate the vibration behavior of orthotropic composite plates under the effect of thickness. In previous works, many investigations were carried out to challenge the effectiveness of this new method. To get insight about the level of accuracy of this method, the effect of boundary conditions, rigidity ratio and the effect of dimension ratio were discussed. The prediction of frequency responses using the qualitative method match very well with those obtained from finite element method. The first six frequency modes are obtained from the results achieved by the finite element method using ANSYS. The comparative and qualitative analysis of frequency responses allowed the justification of the position and the threshold of the respective modal frequencies of the plates in accordance with the results obtained from the numerical and analytical methods in use.
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