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.

Defect Types and Ultrasonic Nondestructive Testing for Fiber-Reinforced Composites

2013 ◽  
Vol 834-836 ◽  
pp. 233-236
Author(s):  
Lin Dong Liu ◽  
Xiao Qing Wu
Keyword(s):  
Failure Modes ◽  
Fiber Reinforced Composites ◽  
Fracture Mechanisms ◽  
Reinforced Composites ◽  
Non Destructive Testing ◽  
Fiber Reinforced ◽  
Destructive Testing ◽  
The Common ◽  
Non Destructive ◽  
Ultrasonic Ndt

In this paper, an attempt is made to introduce the defect types relevant to ultrasonic non-destructive testing, and then, we explain how these defects generate in fiber-reinforced composites. The common failure modes which occur are described and discussed. The significance of each of the fracture mechanisms, in terms of their effects on the residual load-bearing properties, is considered. The second part describes briefly the main relevant ultrasonic NDT methods used to identify these defects and indicates the sensitivity to the different types of defect.

scholarly journals Mechanical Properties of Banana Fabric and Kenaf Fiber Reinforced Epoxy Composites: Effect of Treatment and Hybridization

2019 ◽  
Vol 8 (10) ◽  
pp. 1870-1874
Keyword(s):  
Mechanical Properties ◽  
Natural Fiber ◽  
Fiber Composite ◽  
Fiber Reinforced Composites ◽  
Synthetic Fiber ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Kenaf Fiber ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

Nowadays, Natural Fiber Reinforced composites (NFCs) are emerging to be a good substitute for synthetic fiber reinforced composites as NFCs have many advantages such as low density, high specific strength, recyclability, low cost and good sound abatement quality etc. Among all types of NFCs, a vast study has been done on banana fiber and kenaf fiber reinforced composite. However, only limited work has been done on the banana fabric, kenaf fiber reinforced composite and the effect of their hybridization on mechanical properties. In this paper, an attempt has been made to study the mechanical properties of the banana fabric, kenaf fiber and hybrid banana fabric/kenaf fiber reinforced composites. Effect of alkali treatment on kenaf fiber reinforced composite is discussed in the paper. For the present work, plain-woven banana fabric and randomly oriented kenaf fiber are used as reinforcement while the epoxy resin is used as a matrix. samples are fabricated using hand lay-up and vacuum bagging method. Curing is done at ambient temperature (250C-300C) for 48h. Tensile, impact and hardness test has been performed on a specimen according to ASTM standards. Improvement in mechanical properties is observed after alkali (6% NaOH) treatment on kenaf fiber reinforced composite. Tensile testing behavior of randomly oriented kenaf fiber composite has been studied using Finite element method and results are compared with experimental investigations. This topic present big potential because it seeks to find solution for sustainable development with environmental concerns.

EFFECTS OF SURFACE CHARACTERISTICS ON MECHANICAL AND DIELECTRIC PROPERTIES OF ADHESIVELY BONDED CARBON FIBER COMPOSITES

2021 ◽  
Author(s):  
MINHAZUR RAHMAN ◽  
GAYATHRI KOLA ◽  
MONJUR MORSHED RABBY ◽  
MUTHU RAM PRABHU ELENCHEZHIAN ◽  
RELEBOHILE GEORGE QHOBOSHEANE ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Fiber Composite ◽  
Surface Characteristics ◽  
The State ◽  
Fiber Reinforced Composites ◽  
Carbon Fiber Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Bond Performance ◽  
Lap Shear

The rapid rise of fiber reinforced composite usage in aircraft, spacecraft and automobile industries made the proper comprehension of repair and joining of these materials a crucial aspect. Adhesive bonding is one of the most advantageous and desirable joining and repair technique for fiber reinforced composites. However, the heterogeneity of fiber reinforced composites and the complex interfacial nature of the adhesive bonds, makes most non-destructive evaluation and assessment techniques ineffective to assess the state of the bond. Different manufacturing and surface preparation techniques impart different surface characteristics to the adherends, hence proper understanding of the state of bonds is dependent upon the characteristics of the adherend surfaces. In this approach, carbon fiber composite adherends with controlled surface modifications were made into lap-shear test specimens using film adhesive. The effects of surface characteristics such as surface roughness and surface free energy of the adherend surfaces, on bond performance are studied. These surface characteristics are found to be an indicator of bond performance and can even be used to explain failure modes. Moreover, the performance of these bonds with varying surface characteristics are analyzed non-destructively by dielectric spectroscopy and compared with the mechanical performance of the bonds.

scholarly journals Effect of Fiber Orientation on Tensile and Flexural Properties of Ramie Fiber Composite

2019 ◽  
Vol 9 (1) ◽  
pp. 1728-1732
Keyword(s):  
Mechanical Properties ◽  
Fiber Composite ◽  
Fiber Reinforced Composites ◽  
Ramie Fiber ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Current Effort ◽  
Automobile Body ◽  
Attachment Strength ◽  
Naoh Solution

This current effort appraised the effect of fiber alignment on mechanical possessions of ramie fiber reinforced epoxy composites. In this study ramie fiber is used by means of reinforcement which treated with NaOH solution for improving the attachment strength among fiber and resin by eliminating moisture substances. Models of dissimilar alignments of ramie fiber reinforced composites remained made-up by hand – layup process and studied their mechanical possessions like tensile power and flexural power. The effort of this investigational study devises remained approved out to determine the mechanical properties. The results of this study indicate the orientation 0o /0o shows the enhanced mechanical properties compare to 0o /90o , 45o /-45o and 0o /45o /-45o /90o . It remained projected that the usage 0 o /0o orientation of ramie fiber composite as the alternates for artificial fiber in the development of the automobile body and engineering structure

Applications of Composites on Textile Machinery

2011 ◽  
Vol 233-235 ◽  
pp. 1222-1226
Author(s):  
Sai Nan Wei ◽  
Li Chen
Keyword(s):  
Carbon Fiber ◽  
High Speed ◽  
Rational Design ◽  
Fiber Composite ◽  
Rapid Development ◽  
Fiber Reinforced Composites ◽  
High Price ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Carbon Fiber Composite

High performance fiber reinforced composites have a long history and wide usage in aerospace, sports, military, etc. In this paper applications of composites on textile machinery were elaborated, such as carbon-fiber reinforced plastic (CFRP) guide bar, composite rapier belt and rapier head in rapier loom, nylon shuttle, carbon fiber composite heddle frame for high-speed looms, transmission shaft, needle bed, conveyor belts. It indicated that the composites can improve the performance obviously. Along with the rapid development of textile, fiber reinforced composites are continuous replacing the traditional materials as cast iron, steel and aluminum textile machine parts, But the applications of composites on textile machinery are still in the initial stage. High price is the major obstruction factor for its development. Through improving the level of automation technology, reducing producing cost, rational design of structure, the producing cost can be sharply reduced, which is also benefit for textile machinery development.

Experimental and Numerical Studies on Integration Thermoplastic Composite Compatible Piezoelectric Ceramics for Actuatory Application of Cylindrical Hollow Structures

2015 ◽  
Vol 825-826 ◽  
pp. 556-562
Author(s):  
Tony Weber ◽  
Maik Gude ◽  
Tobias Kastner
Keyword(s):  
Fiber Composite ◽  
Construction Material ◽  
Experimental Studies ◽  
Thermoplastic Composite ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Structure Topology ◽  
Definition Of

Regarding the economical use of fiber-reinforced plastics (FRP) as a construction material for structural components whose additional value caused not only in their high specific mechanical properties. Due to the layerwise structure definition of continuous fiber reinforced composites the corresponding production technologies offers a high potential for integration of additional functional elements. Past efforts to the integration of functions in fiber-reinforced composites usual provide in front of a passive use of the piezoelectric effect (eg. structural-health monitoring). Through efficient and structurally defined using of piezoceramic actuators, the planar structure topology of cylindrical hollow FRP profiles can be actively influenced. Based on experimental studies on the definition of basic concepts for the integration of thermoplastic compatible piezoceramic modules (TPM) in fiber composite tubular segments, this paper deals with the understanding and performance capabilities of such actuarical hollow frp structures. The selective excitation and manipulation of the vibration behavior of such rotationally symmetric structures serves for generation of wave effects with radial translational characteristic. The performed experimental studies on the structural behavior of active piezo integral pipe segments are abstracted and compared by means of numerical simulations using multi-physical elements.

Fiber Reinforced Composite Materials in Architecture

2015 ◽  
Vol 789-790 ◽  
pp. 1171-1175
Author(s):  
Saniye Karaman Öztaş
Keyword(s):  
Composite Materials ◽  
Fiber Composite ◽  
Chemical Properties ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Technical Performance ◽  
Reinforced Composite ◽  
Materials Used

Composite materials are made from two or more constituent materials with significantly different physical or chemical properties. The materials work together to give the composite more excellent properties than its components.Fiber reinforced composite materials constitute a widely used group of the composites. There are many researches about fiber reinforced composites. This study focused on fiber reinforced composite materials used in architecture unlike other researches. It was aimed to specify the benefits of the fiber composite materials for architecture and discussed several recent developments related to these materials. A literature review was made by grouping composites materials. The study reported that more research is needed for fiber reinforced composites to improve their technical performance, environmental and economic properties.

Finite Element Analysis of Influence of Nanoparticle on Hybrid Composites Reinforced by Fiber and Nanoparticle

2014 ◽  
Vol 1033-1034 ◽  
pp. 892-895
Author(s):  
Xiao Qiang Wang ◽  
Wei Tao Zhao ◽  
Bo Fang ◽  
Ye Wei Zhang
Keyword(s):  
Mechanical Property ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Materials ◽  
Fiber Composite ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Finite Element Software

In order to improve the strength and toughness of materials, nanoparticle is always embedded into epoxy resin and fiber composite materials. The influence of the number, distribution and mechanical property of nanoparticle arranged around the fiber on fiber reinforced composites is evaluated in this paper. A finite element analysis under a tensile load is performed by using commercial finite element software named as ABAQUS. Both the stress contour and progressive damage failure mode of the representative volume element (RVE) model of fiber reinforced composites are obtained. A series of computational experimental results indicate that both the space geometry property and mechanical property of nanoparticle have a significant effect on the stiffness and strength properties of these composite materials.

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