Poisson's ratio and the interfacial behaviour of composite materials

Composites ◽  
1995 ◽  
Vol 26 (12) ◽  
pp. 887-889 ◽  
Author(s):  
George Laird ◽  
T.C. Kennedy
Keyword(s):  
Composite Materials ◽  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Interfacial Behaviour

Multilayer Composite Materials with Non-Usual Poisson's Ratios

2007 ◽  
Vol 555 ◽  
pp. 545-552 ◽  
Author(s):  
E.H. Harkati ◽  
Z. Azari ◽  
P. Jodin ◽  
A. Bezazi
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Poisson’S Ratio ◽  
Cellular Materials ◽  
Poisson's Ratio ◽  
Multilayer Composite ◽  
Computer Programme ◽  
Poisson's Ratios ◽  
Poisson’S Ratios

Most of usual materials exhibit Poisson's ratio comprised between 0 and 0.5. But, for some kind of cellular materials, or for some stacking sequences of unidirectional plies, a composite material can exhibit negative or greater than 0.5 Poisson's ratios. In this paper, a study of different stacking sequences such as [±β/±θ]s plies made from highly anisotropic fibre pre-preg is presented. A special computer programme has been developed for this purpose. Eighteen stacking sequences, including the [±θ] ones, have been computed. The results show that at least one of Poisson's ratios varies between -0.8 to +0.4. Such kind of materials may find applications for particular cases, as their strength is significantly increased by this phenomenon.

Intensification of auxetic effect in high stiffness auxetic yarns with potential application as the reinforcing element of composite

2020 ◽  
pp. 152808372097891
Author(s):  
Asal Lolaki ◽  
Mohammed Zarrebini ◽  
Davood Mostofinejad ◽  
Mohsen Shanbeh ◽  
Sayyed Mahdi Abtahi
Keyword(s):  
Composite Materials ◽  
Poisson’S Ratio ◽  
Steel Wire ◽  
Poisson's Ratio ◽  
The Core ◽  
High Stiffness ◽  
Composite Yarn ◽  
Dependent Behavior ◽  
Core Components ◽  
Strain Dependent

Helical auxetic yarn (HAY) is a newly developed composite yarn with negative Poisson’s ratio. HAYs offers advantageous merits as a reinforcing element in composite materials. In this paper high stiffness HAYs composed of Nylon filament core and fine steel wire wrap yarns were developed. The importance of the stiffness ratio of the wrap to the core components in the resultant auxetic yarn was examined. The differences between instantaneous and engineering Poisson’s ratio analyses in the understanding of the strain-dependent behavior of HAY was investigated. Results revealed that the utilization of the fine steel multifilament in the developed HAY samples enormously improves the stiffness of HAY. It was possible to obtain an elastic modulus of 9 GPa and a maximum auxetic effect of –16.82 in the samples. It was concluded that such highly stiff auxetic yarn can successfully be used as reinforcement in various composite materials such as cementitious composites.

scholarly journals Stress Analysis of Bilayer Composite Materials with Various Passion Ratio

2018 ◽  
Vol 7 (4.19) ◽  
pp. 1001
Author(s):  
Yeasin Bhuiyan ◽  
Md. Abdus Salam Akanda ◽  
Karim Egab ◽  
Hassan Raheem Hassan ◽  
Saad K. Oudah
Keyword(s):  
Composite Materials ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Stress Analysis ◽  
Difference Method ◽  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Two Dimensional ◽  
Composites Materials ◽  
Mathematical Expressions

Composites materials are needed because of the widely used in structures and designs. In this work, the stress analysis of two-dimensional bilayer composite materials has a different passion ratio have studied. The materials under consideration are assumed to be perfectly bonded together. Finite difference method is used for the solution of two-dimensional elastic problems. In each layer of the composite, the mechanical properties are isotropic. The results are observed that the results agree well within the acceptable limit, which also confirms the reliability of the finite difference method. Changing in Poisson’s ratio in any layer has significant effects on the results of all layers of the bilayer composite. Due to the mathematical expressions of stresses and displacements for two-dimensional elastic problems, the study of the effects of Poisson’s ratio has a significant influence.  

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