scholarly journals Delamination mechanisms in fiber-reinforced composites structures tested at different loadings

2020 ◽  
Vol 12 (1) ◽  
pp. 175-182 ◽  
Author(s):  
Adriana STEFAN ◽  
George PELIN ◽  
Alina DRAGOMIRESCU ◽  
Alexandra PETRE ◽  
Sorina ILINA
Keyword(s):  
Carbon Fibers ◽  
Composite System ◽  
High Strength ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Mechanical Loads ◽  
Synthetic Fibers ◽  
Low Weight ◽  
Mechanical And Physical Properties ◽  
Strength And Stiffness

Composite materials are a special class which has some advantages like low weight, high strength and stiffness. For a composite system they are very suitable for aerospace, marine and auto applications due to the low density. Among all the synthetic fibers, carbon fibers are now considered the first material to be used for reinforcement due to their proper cost, as compared to aramid, and better mechanical and physical properties. This paper is an experimental work and presents the preliminary results regarding the evaluation of CFRP prepreg based on M18/1 carbon fiber prepreg developed by manual lay-up/autoclave curing. The obtained materials were tested at different mechanical loads and the failure mode was analyzed with the aim of evaluating their performances. The mechanism by which the fibers are delaminated in the composite system is assessed. To verify if the structure has defects that can interfere with the delamination process, ultrasonic nondestructive testing has been used. Also, for a better understanding of the delamination mechanism, the numerical simulation was used.

scholarly journals Graphene-Coated Sensor Yarn for Composite Preforms

Proceedings ◽  
2020 ◽  
Vol 32 (1) ◽  
pp. 21
Author(s):  
Fernando ◽  
Ali ◽  
Tan ◽  
He
Keyword(s):  
High Strength ◽  
Textile Fibre ◽  
Reinforced Composites ◽  
Low Weight ◽  
Strength And Stiffness ◽  
Fibre Reinforced Composites

There is extensive research to demonstrate that textile fibre reinforced composites can produce high strength and stiffness at a low weight allowing them to become excellent candidates for applications requiring improved strength and lighter structures compared to their metallic counterparts. [...]

ARTIFICIAL GENERATION OF 2-D FIBER REINFORCED COMPOSITE MICROSTRUCTURES WITH STATISTICALLY EQUIVALENT FEATURES

2021 ◽  
Author(s):  
JAMAL F. HUSSEINI ◽  
SCOTT E. STAPLETON ◽  
EVAN J. PINEDA
Keyword(s):  
Volume Fraction ◽  
Real Life ◽  
High Strength ◽  
Material Behavior ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Equivalent Models ◽  
Reinforced Composite ◽  
Low Weight

Fiber reinforced composites are used widely for their high strength and low weight advantages in various aerospace and automotive applications. While their use may be sought after, modeling of these material requires increasing fidelity at the lower scales to capture accurate material behavior under loading. The first steps in creating statistically equivalent models to real life cases is developing a method of rapid evaluation and artificial microstructure generation. The outlined work is capable of tracking microscale fiber positions and determining regions of localized volume fraction extrema (high and low end). Groupings of high and low volume fraction regions are called clusters and their geometry is used to characterize the microstructure. These cluster features can be evaluated for both artificial models and actual scans, allowing correlation to be established which can ultimately be used to regenerate statistically equivalent models. The results of this work show that if one feature is to be correlated, a model can be generated which matches almost exactly. But once more features are equally taken into account, the regeneration loses accuracy.

Compressive behaviors of ultra-low-weight foamed cement-based composite reinforced by polypropylene short fibers

2020 ◽  
Vol 29 (8) ◽  
pp. 1306-1325
Author(s):  
Yuanyi Yang ◽  
Qi Zhou ◽  
Yi Deng ◽  
Jinhui Lin
Keyword(s):  
Damage Model ◽  
Fiber Reinforced Composites ◽  
Plastic Behavior ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Static Compression ◽  
Synthetic Fibers ◽  
Compression Performance ◽  
Brittle Behavior ◽  
Low Weight

With advantages in sustainability, low thermal conductivity, and self-weight, the foamed cement-based composites have captured tremendous attention in various low strength structural and nonstructural applications. This paper aimed to investigate the effects of the short polypropylene fibers on the quasi-static compression performance of the ultra-low-weight foamed cement-based composites. The results show that the elasticity modulus, peak strength, and ultimate linear strength of the fiber-reinforced composites are increased by 208%, 42%, and 71%, respectively. The plateau stress and the densification strain energy of fiber-reinforced composites are improved by up to 49% and 47%. Simultaneously, the failure mode of the fibrous sample is altered from a brittle behavior to plastic behavior. The significance of this work shows that short synthetic fibers can improve the compressive capacity considerably, turning out to be an effective strategy for obtaining higher mechanical strengths associated with ultra-low-weight typical cement-based elements. According to the experiment results, a constructive damage model is carried out to describe the compressive properties of short PP fiber-reinforced composites. Thus, such theoretical curves can describe the compression behavior successfully and can be potentially applied in practical project and numerical simulation. This work can also be useful toward the foundation of optimal design for toughening behavior in fiber-reinforced lightweight cement elements.

scholarly journals Current technologies for recycling fiber-reinforced composites

2020 ◽  
Vol 70 (3) ◽  
pp. 24-28
Author(s):  
Aleksandra Jelić ◽  
Danijela Kovačević ◽  
Marina Stamenović ◽  
Slaviša Putić
Keyword(s):  
Composite Materials ◽  
New Technologies ◽  
High Strength ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
High Toughness ◽  
Reinforced Composite ◽  
Low Weight

High strength, high toughness, and low weight make fiber-reinforced composite materials important as an alternative to traditional materials. Due to their application in different fields, such as construction, aviation, marine, automotive technologies and biomedicine, their production has increased leading to the increasement of composite wastes. New technologies for managing fiber-reinforced composite wastes have been developed to solve the issue of end-of-life of these materials. The aim of this paper is to emphasize recycling technologies used for fiber reinforced composites, and their potential reusage.

Critical Evaluation of the Stiffening Effect of Carbon Nanotubes in Composites

2004 ◽  
Vol 261-263 ◽  
pp. 1487-1492 ◽  
Author(s):  
Dong Li Shi ◽  
Xi Qiao Feng ◽  
Yonggang Y. Huang ◽  
Keh Chih Hwang
Keyword(s):  
Critical Evaluation ◽  
High Strength ◽  
Great Promise ◽  
Low Density ◽  
Reinforced Composites ◽  
Mechanical And Physical Properties ◽  
The Matrix ◽  
Reinforcing Material ◽  
Strength And Stiffness ◽  
Stiffening Effect

Owing to their superior mechanical and physical properties, cCarbon nanotubes (CNTs) seem to hold a great promise as an ideal reinforcing material for composites of high-strength and low-density. HOWEVER, In most of the experimental results to date, however, only modest improvements in the strength and stiffness have been achieved by incorporating carbon nanotubeCNTs in polymers. There are many factors that influence the overall mechanical property properties of CNT-reinforced composites, e.g. the weak bonding between CNTs and matrix, the waviness and agglomeration of CNTs. In the presentis paper, we use the Mori-Tanaka method to evaluate the effects of these factors on the moduli stiffness of CNTs-CNT-reinforced composites are examined. It is established found that the waviness and agglomeration may significantly reduce the stiffening effect of CNTs, while the interface adhesion between the matrix and CNTs has little influence the moduli of CNTs-reinforced composites little.

Investigation of Fiber-Reinforced Modified Epoxy Resin Composites

2012 ◽  
Vol 510-511 ◽  
pp. 577-584 ◽  
Author(s):  
A. Quddos ◽  
Mohammad Bilal Khan ◽  
R.N. Khan ◽  
M.K.K. Ghauri
Keyword(s):  
Epoxy Resin ◽  
High Strength ◽  
Polymeric Matrix ◽  
Fiber Reinforced Composites ◽  
Resin Matrix ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Epoxy Resin Matrix ◽  
The Matrix ◽  
Modified Epoxy

The impregnation of the fiber with a resin system, the polymeric matrix with the interface needs to be properly cured so that the dimensional stability of the matrix and the composite is ensured. A modified epoxy resin matrix was obtained with a reactive toughening agent and anhydride as a curing agent. The mechanical properties of the modified epoxy matrix and its fiber reinforced composites were investigated systematically. The polymeric matrix possessed many good properties, including high strength, high elongation at break, low viscosity, long pot life at room temperature, and good water resistance. The special attentions are given to the matrix due to its low out gassing, low water absorption and radiation resistance. In addition, the fiber-reinforced composites showed a high strength conversion ratio of the fiber and good fatigue resistance. The dynamic and static of the composite material were studied by thermo gravimetric analysis (TGA), Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM) with EDX. The influences of processing technique such as curing and proper mixing on the mechanical and interfacial properties were determined. The results demonstrated that the modified epoxy resin matrix is very suitable for applications in products fabricated with fiber-reinforced composites.

Natural Fiber Reinforced Synthetic Polymer Composites

2019 ◽  
Vol 23 ◽  
pp. 6-30
Author(s):  
Volkan Uğraşkan ◽  
Abdullah Toraman ◽  
A. Binnaz Hazar Yoruç
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibers ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Thermal And Mechanical Properties ◽  
Fiber Reinforced ◽  
Promising Alternative ◽  
Alternative Sources

In early composite materials, the use of petroleum based fibers such as glass and carbon fibers, aramid etc. was common. In order to reduce the dependency on petroleum based sources and environmental pollution, researchers have focused on the search for alternative sources. Natural fibers are abundant, recyclable and biodegradable plant derived materials. Besides, thanks to good physical, thermal and mechanical properties, natural fibers become promising alternative for composites. This review includes information about natural fiber reinforced composites’ components, manufacturing methods, mechanical properties and applications.

scholarly journals Simplified Material Solution for Orthotropic Symmetrical GFRP Laminates for Structural Facades

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Yuchao Zhao ◽  
Xu Jiang ◽  
Qilin Zhang ◽  
Xuhong Qiang
Keyword(s):  
Design Theory ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Free Form ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Complex Design ◽  
Low Weight ◽  
Strength And Stiffness ◽  
Material Solution

GFRP (glass-fiber-reinforced polymer), as a composite material, possesses many favorable properties including high strength and low weight and is amenable to unique processing methods; therefore, it is a potential free-form surface material. However, the complex design theory owing to anisotropy limits its application. Thus, a simplified material solution becomes significant. In this study, the strength and stiffness of orthotropic symmetrical GFRP laminates are derived theoretically, and a simplified material solution is proposed to simplify the anisotropy as isotropy. Then, using the numerical simulation of an actual orthotropic symmetrical GFRP laminate free-form facade structure, the effectiveness of the simplified material solution is analyzed and evaluated. This solution can provide guidance for similar GFRP facades and further promote the application of GFRP in engineering.

Frictional Sliding of Microcracks under Compression

2004 ◽  
Vol 261-263 ◽  
pp. 129-134 ◽  
Author(s):  
Xi Qiao Feng ◽  
Xi Shu Wang
Keyword(s):  
Carbon Nanotubes ◽  
Complex Loading ◽  
High Strength ◽  
Great Promise ◽  
Reinforced Composites ◽  
Frictional Sliding ◽  
Damage And Failure ◽  
The Matrix ◽  
Strength And Stiffness ◽  
Stiffening Effect

It is of interest to understand damage and failure mechanisms of microcracks and their evolution as a function of loading history, especially in the case of complex loading. Owing to their superior mechanical and physical properties, carbon nanotubes (CNTs) seem to hold a great promise as an ideal reinforcing material for composites of high-strength and low-density. HOWEVER, In most of the experimental results, only modest improvements in the strength and stiffness have been achieved by incorporating carbon nanotubes in polymers. There are many factors that influence the overall mechanical property of CNT-reinforced composites, e.g. the weak bonding between CNTs and matrix, the waviness and agglomeration of CNTs. In the present paper, we use the Mori-Tanaka method to evaluate the effect of these factors on the moduli of CNTs-CNT-reinforced composites. It is established that the waviness and agglomeration may significantly reduce the stiffening effect of CNTs, while the interface between the matrix and CNTs influence the moduli of CNTs-reinforced composites little.In this paper, the frictional sliding of microcracks under complex triaxial loading is analyzed, and the obtained results are incorporated into the constitutive relation of microcrack-weakened brittle materials.

scholarly journals Influence of process parameters on the tensile properties of DREF-3000 friction spun hybrid yarns consisting of waste staple carbon fiber for thermoplastic composites

2017 ◽  
Vol 89 (1) ◽  
pp. 32-42 ◽  
Author(s):  
Mir Mohammad Badrul Hasan ◽  
Stefanie Nitsche ◽  
Anwar Abdkader ◽  
Chokri Cherif
Keyword(s):  
Carbon Fiber ◽  
Process Parameters ◽  
Polyamide 6 ◽  
Fiber Reinforced Composites ◽  
Thermoplastic Composites ◽  
Reinforced Composites ◽  
Influence Of Process Parameters ◽  
Low Weight ◽  
Carbon Fiber Reinforced Composites ◽  
The Relationship

Due to their excellent strength, rigidity, and damping properties, as well as low weight, carbon fiber reinforced composites (CFRCs) are being widely used for load bearing structures. On the other hand, with an increased demand and usage of CFRCs, effective methods to re-use waste carbon fiber (CF) materials, which are recoverable either from process scraps or from end-of-life components, are attracting increased attention. In this paper, hybrid yarns consisting of waste staple CF (40 and 60 mm) and polyamide 6 staple fibers (60 mm) are manufactured on a DREF-3000 friction spinning machine with various process parameters, such as spinning drum speed, suction air pressure, and core–sheath ratio. The relationship between different textile physical properties of the hybrid yarns, such as tensile strength, elongation, and evenness with different spinning parameters, core–sheath ratio, and input CF length is revealed.

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