scholarly journals Study on Fracture Mechanism for Composite Materials Based on the Concept of the Change in Poisson's Ratio

1972 ◽  
Vol 21 (229) ◽  
pp. 921-927
Author(s):  
Taichi FUJII ◽  
Kiyoshi MIZUKAWA ◽  
Masaru ZAKO
Keyword(s):  
Composite Materials ◽  
Fracture Mechanism ◽  
Poisson’S Ratio ◽  
Poisson's Ratio

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.

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