scholarly journals Hi-Nicalon fiber-reinforced celsian matrix composites: Influence of interface modification

1998 ◽  
Vol 13 (6) ◽  
pp. 1530-1537 ◽  
Author(s):  
Narottam P. Bansal ◽  
Jeffrey I. Eldridge
Keyword(s):  
Fiber Strength ◽  
Mechanical Damage ◽  
Young Modulus ◽  
Matrix Cracking ◽  
Fiber Reinforced Composites ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Coated Fiber ◽  
Point Bend

Unidirectional celsian matrix composites having 42–45 vol% of uncoated or BN-SiC coated Hi-Nicalon fibers were tested in three-point bend at room temperature. The uncoated fiber-reinforced composites showed catastrophic failure with strength of 210 ± 35 MPa and a flat fracture surface. In contrast, composites reinforced with coated fibers exhibited graceful failure with extensive fiber pullout. Values of first matrix cracking stress and strain were 435 ± 35 MPa and 0.27 ± 0.01%, respectively, with ultimate strength as high as 960 MPa. The elastic Young modulus of the uncoated and coated fiber-reinforced composites were 184 ± 4 GPa and 165 ± 5 GPa, respectively. Fiber push-through tests and microscopic examination indicated no chemical reaction at the uncoated or coated fiber-matrix interface. The low strength of composite with uncoated fibers is due to degradation of the fiber strength from mechanical damage during processing. Because both the coated- and uncoated-fiber-reinforced composites exhibited weak interfaces, the beneficial effect of the BN-SiC dual layer is primarily the protection of fibers from mechanical damage during processing.

A review of applications of CT imaging on fiber reinforced composites

2021 ◽  
pp. 002199832110507
Author(s):  
Yantao Gao ◽  
Wenfeng Hu ◽  
Sanfa Xin ◽  
Lijuan Sun
Keyword(s):  
Mechanical Damage ◽  
Ceramic Matrix Composites ◽  
Ct Imaging ◽  
Fiber Reinforced Composites ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
X Ray ◽  
Materials Research ◽  
Physical And Chemical

With the development of X-ray computed tomography over the last few decades, it is gradually considered to be a powerful tool in the field of materials research. This paper presents a comprehensive review of applications of CT imaging on fiber reinforced composites, from polymer composites to ceramic matrix composites. The principle of X-ray CT and experimental tomography setups was described firstly. Then, in situ experimental devices developed in recent years were illustrated. Furthermore, the applications of X-ray CT imaging on manufacturing process, modeling, mechanical damage, physical, and chemical behaviors were reviewed in detail. Besides, advantages and limitations of X-ray CT imaging were pointed out and the future development was prospected.

Optical Microscopy of Fiber-Reinforced Composites

2010 ◽  
Author(s):  
Brian S. Hayes ◽  
Luther M. Gammon
Keyword(s):  
Optical Microscopy ◽  
Polymer Matrix Composites ◽  
Fiber Reinforced Composites ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Structural Variations ◽  
And Performance ◽  
Areas Of Interest ◽  
Tools And Techniques

Optical Microscopy of Fiber-Reinforced Composites discusses the tools and techniques used to examine the microstructure of engineered composites and provides insights that can help improve the quality and performance of parts made from them. It begins with a review of fiber-reinforced polymer-matrix composites and their unique microstructure and morphology. It then explains how to prepare and mount test samples, how to assess lighting, illumination, and contrast needs, and how to use reagents to bring out different phases and areas of interest. It also presents the results of several studies that have been conducted using optical microscopy to gain a better understanding of processing effects, toughening approaches, defects and damage mechanisms, and structural variations. The book includes more than 180 full-color images along with clear and concise explanations of what they reveal about composite materials and processing methods. For information on the print version, ISBN 978-1-61503-044-6, follow this link.

A Review on Mechanical and Acoustic Emission Behavior of Basalt Fiber Reinforced Composites

2018 ◽  
Vol 1148 ◽  
pp. 37-42
Author(s):  
Vemu Vara Prasad ◽  
Tanna Eswara Rao
Keyword(s):  
Acoustic Emission ◽  
Polymer Matrix ◽  
Failure Modes ◽  
Natural Fiber ◽  
Polymer Matrix Composites ◽  
Basalt Fiber ◽  
Fiber Reinforced Composites ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced

Now a day’s eco-friendly natural fiber used as the reinforcement for the fabrication of the light weight, lower cost and biodegradable polymer matrix composites. One of such available natural reinforcement for the composite material is basalt fiber. The present paper gives a review on how the basalt fiber reinforced polymer matrix composite behave when they are adhesively, riveted and hybrid joined with other reinforcements such as aluminum, which is used for the particular or other applications and which joint gives better efficiency , suited for given application were discussed and the three joining techniques were investigated. Behavior of basalt fiber reinforced composites for the frequencies at which frequencies the failures like adhesive failure, light fiber tear, and mixed failure modes will occur. These three types of failure modes are investigated with the help of acoustic emission monitoring system.

Influence of Loading Frequency on Thermal and Micro-Mechanical Damage During Fatigue of Flax Fiber Reinforced Composites

2020 ◽  
Author(s):  
Md. Zahirul Islam ◽  
Chad A. Ulven
Keyword(s):  
High Performance ◽  
Thermal Damage ◽  
Natural Fiber ◽  
Mechanical Damage ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Loading Frequency ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Self Heating

Abstract Like synthetic fiber reinforced composites, natural fiber reinforced composites possess a good potential to be used in high performance applications due to their good balance of mechanical and damping properties. Composite materials used in sporting goods equipment and automotive applications are subjected to repeating, regular loads. Therefore a clear understanding about the reliability of composite materials under fatigue/cyclic loading is important for their design in high performance applications. Currently, the fatigue performance of natural fiber reinforced composites are not well understood or characterized. The fatigue damage of flax fiber reinforced polymer matrix composites can be divided into two components: thermal damage due to self-heating in the sample and micro-mechanical damage due to damage creation (i.e. crack initiation, crack propagation, delamination, etc.). In this study, fatigue tests were conducted at four different loading frequencies and the two energy components defined were separated experimentally. The fatigue life of flax fiber reinforced composites was found to decrease with increasing loading frequency. Thermal damage due to the high self-heating temperature of the sample was found to be the main responsible form of energy which decreases fatigue life with increasing loading frequency. Micro-mechanical damage due to cyclic loading was not found to change significantly with increasing loading frequency.

scholarly journals Natural Composite Reinforced by Lontar (Borassus flabellifer) Fiber: An Experimental Study on Open-Hole Tensile Strength

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Jefri Bale ◽  
Kristomus Boimau ◽  
Marselinus Nenobesi
Keyword(s):  
Tensile Strength ◽  
Unsaturated Polyester ◽  
Specific Area ◽  
Matrix Cracking ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Hole Configuration ◽  
The Matrix

A research has been conducted in the present study to investigate the effect of hole configuration on tensile strength of lontar fiber-reinforced composites. The lontar fiber-reinforced composites used in this study were produced by hand lay-up process. The lontar fiber-reinforced composites consist of short random fiber of 5 cm that contains 32% of nominal fiber volume as the reinforcement and unsaturated polyester as the matrix. The results show that the differences of hole configuration have an effect on tensile strength of lontar fiber-reinforced composites. It is found that the specific area of four-hole specimens experiences smaller strain propagation due to the redistributed stress and no stress passes through the hole. The damage of lontar fiber-reinforced composites with different hole configurations in tension is fairly straight and transverse to the loading axis, where the initial damage occurs in the form of matrix cracking, propagates into interfacial failure in form of delamination, and ultimately failed mainly due to the fiber breakage.

Design, Fabrication and Analysis of Advanced Polymer Based Kevlar-49 Composite Material

2014 ◽  
Vol 592-594 ◽  
pp. 122-127
Author(s):  
M. Kaliraj ◽  
P. Narayanasamy ◽  
M. Rajkumar ◽  
M. Mohammed Mohaideen ◽  
I. Neethi Manickam
Keyword(s):  
Composite Material ◽  
Volume Fraction ◽  
Fatigue Behavior ◽  
Fiber Reinforced Composites ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Wide Range ◽  
The Matrix ◽  
Set Up

The fatigue behavior of reinforced composites is complex and the present knowledge of fatigue study still needs extensive investigation of the micromechanical composite behavior. In fiber reinforced composites mechanical properties are highly dependent on their compositions, the matrix type as well as the volume fraction of the reinforcement and their arrangements such as random orientation and distribution, which increase the complexity in the study of fatigue damage behavior. There exist several classes of models to predict the fatigue life or the fatigue degradation of fiber reinforced composites but there exists so far no fatigue model that can be applied to a wide range of fiber reinforced composites. Thus, modifications of fatigue models are always needed in accordance with the micromechanical behavior of different fiber/matrix composites. In this paper the fatigue failure is rectified by using polymer based Kevlar composite material. The design and fabrication involves the design of polymer matrix like as fiber and resin, hardener etc. Kevlar-49 is chosen for as fabricating material to carry out this work. The fabrication set up is made by Vacuum Bag and it is demonstrated satisfactorily.

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