Stiffness Degradation of Fiber-Reinforced Composites under Uniaxial Tensile, Pure Torsional, and Biaxial Fatigue at Cryogenic Temperature

2009 ◽  
pp. 287-287-15 ◽  
Author(s):  
SS Wang ◽  
ES-M Chim ◽  
DF Socie
Keyword(s):  
Cryogenic Temperature ◽  
Fiber Reinforced Composites ◽  
Stiffness Degradation ◽  
Uniaxial Tensile ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Biaxial Fatigue

Biaxial Fatigue of Fiber-Reinforced Composites at Cryogenic Temperatures. Part I: Fatigue Fracture Life and Mechanisms

1982 ◽  
Vol 104 (2) ◽  
pp. 128-136 ◽  
Author(s):  
S. S. Wang ◽  
E. S.-M. Chim ◽  
D. F. Socie
Keyword(s):  
Fatigue Fracture ◽  
Fiber Composite ◽  
Fiber Reinforced Composites ◽  
Fracture Mechanisms ◽  
Reinforced Composites ◽  
Cryogenic Temperatures ◽  
Fiber Reinforced ◽  
Biaxial Fatigue ◽  
Electron Microscopes ◽  
Fracture Stiffness

A study of biaxial fatigue of glass fiber-reinforced composites subjected to in-phase, cyclic tensile and torsional loading at cryogenic temperatures is presented. Fatigue failure of the composite is investigated in terms of cyclic fracture, stiffness degradation, and energy dissipation. Fatigue fracture lives of the cryogenic composite are obtained for the cases of various combinations of cyclic tensile and torsional stresses. A power-law relationship is established between the range of cyclic octahedral shear stress and the number of cycles to fracture. Influences of hydrostatic mean stress and stress biaxiality ratio on fatigue fracture of the fiber composite are determined. Fracture mechanisms in the material during the cryogenic biaxial fatigue are examined by using optical and scanning electron microscopes.

Damage mechanisms characterization of flax fibers–reinforced composites with interleaved natural viscoelastic layer using acoustic emission analysis

2019 ◽  
Vol 53 (18) ◽  
pp. 2623-2637 ◽  
Author(s):  
Abderrahim El Mahi ◽  
Hajer Daoud ◽  
Jean-Luc Rebiere ◽  
Isabelle Gimenez ◽  
Mohamed Taktak ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Mechanical Behavior ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Viscoelastic Layer ◽  
Uniaxial Tensile ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Viscoelastic Composite ◽  
The Impact

In this paper, the static and fatigue behavior of flax fiber-reinforced composites with and without an interleaved natural viscoelastic layer are investigated. Viscoelastic composite plates consist of a soft natural viscoelastic layer which is confined between two identical flax fiber reinforced composites. Different stacking sequences of specimens are tested with uniaxial tensile loading until failure. The mechanical behavior and the acoustic activity of damage sources in various configurations with and without a viscoelastic layer are compared. The analysis of acoustic emission signals and the macroscopic and microscopic observations led to the identification of the main acoustic signatures of different damage modes dominant in each type of composites (with and without a viscoelastic layer). These results allow better identification of the influence of the impact of a viscoelastic layer on the mechanical behavior of different composites. In addition, static and fatigue flexural behavior of unidirectional composites with and without viscoelastic layer are characterized in 3-point bending tests. The effects of viscoelastic layer on the stiffness, hysteresis loops, and loss factor are studied for various numbers of cycles during cyclic fatigue.

Information in United States Patents on works related to ‘Natural Fibers’: 2000-2018

2019 ◽  
Vol 12 (1) ◽  
pp. 4-76 ◽  
Author(s):  
Krittirash Yorseng ◽  
Mavinkere R. Sanjay ◽  
Jiratti Tengsuthiwat ◽  
Harikrishnan Pulikkalparambil ◽  
Jyotishkumar Parameswaranpillai ◽  
...  
Keyword(s):  
United States ◽  
Composite Materials ◽  
Natural Fiber ◽  
Comprehensive Evaluation ◽  
Natural Fibers ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Macro Scale ◽  
Structural Applications

Background: This era has seen outstanding achievements in materials science through the advances in natural fiber-based composites. The new environmentally friendly and sustainability concerns have imposed the chemists, biologists, researchers, engineers, and scientists to discover the engineering and structural applications of natural fiber reinforced composites. Objective: To present a comprehensive evaluation of information from 2000 to 2018 in United States patents in the field of natural fibers and their composite materials. Methods: The patent data have been taken from the external links of US patents such as IFI CLAIMS Patent Services, USPTO, USPTO Assignment, Espacenet, Global Dossier, and Discuss. Results: The present world scenario demands the usage of natural fibers from agricultural and forest byproducts as a reinforcement material for fiber reinforced composites. Natural fibers can be easily extracted from plants and animals. Recently natural fiber in nanoscale is preferred over micro and macro scale fibers due to its superior thermo-mechanical properties. However, the choice of macro, micro, and nanofibers depends on their applications. Conclusion: This document presents a comprehensive evaluation of information from 2000 to 2018 in United States patents in the field of natural fibers and their composite materials.

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