scholarly journals Modified rule of Mixtures for prediction of Tensile strength of Unidirectional Fibre Reinforced Composites

1997 ◽  
Vol 6 (5) ◽  
pp. 096369359700600 ◽  
Author(s):  
C. S. Lee ◽  
W. Hwang
Keyword(s):  
Tensile Strength ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Reinforced Composites ◽  
Strength Data ◽  
Rule Of Mixtures ◽  
Unidirectional Fibre ◽  
Fibre Reinforced Composites ◽  
Good Agreement

The rule of mixtures was modified based on the concept of effective fibre volume fraction. The degradation parameter of effective fibre volume fraction was proposed in consideration of the microgeometry of composite components. It was shown that the modified rule has good agreement with the experimental strength data and the degradation parameter of effective fibre volume fraction used in this study can be used on general composites.

scholarly journals Effects of compressing parameters and Mg(OH)2 content on mechanical properties and flame retardancy of rice straw-fibre reinforced composites

2021 ◽  
Vol 63 (4) ◽  
pp. 28-35
Author(s):  
Doan Van Hong Thien ◽  
◽  
Thao Phuong Nguyen ◽  
Mong Linh Nguyen Thi ◽  
Ngoc Tuyet Tran ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rice Straw ◽  
Flame Retardancy ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Reinforced Composites ◽  
Fibre Reinforced Composites ◽  
Compression Temperature ◽  
Properties Of Composites

Rice straw fibre was utilized for unidirectional (UD) composites. In this study, the effects of compression temperature, duration, pressure, and fibre volume fraction on the mechanical properties of composites were investigated, respectively. The composite with optimal mechanical properties was prepared at a temperature of 180oC, pressure of 125 kg.cm-2 for 10 min, and at a fibre volume fraction of 40%. Mg(OH)2 was found to be an appropriate additive to enhance the flame retardancy of the composite. Interestingly, this agent also improved the mechanical and thermal insulation properties of the obtained composite.

scholarly journals The Mechanical Properties of Steel-Polypropylene Fibre Composites Concrete (HyFRCC)

2015 ◽  
Vol 773-774 ◽  
pp. 949-953 ◽  
Author(s):  
Izni Syahrizal Ibrahim ◽  
Wan Amizah Wan Jusoh ◽  
Abdul Rahman Mohd Sam ◽  
Nur Ain Mustapa ◽  
Sk Muiz Sk Abdul Razak
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Volume Fraction ◽  
Concrete Strength ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Polypropylene Fibre ◽  
Experimental Results

This paper discusses the experimental results on the mechanical properties of hybrid fibre reinforced composite concrete (HyFRCC) containing different proportions of steel fibre (SF) and polypropylene fibre (PPF). The mechanical properties include compressive strength, tensile strength, and flexural strength. SF is known to enhance the flexural and tensile strengths, and at the same time is able to resist the formation of macro cracking. Meanwhile, PPF contributes to the tensile strain capacity and compressive strength, and also delay the formation of micro cracks. Hooked-end deformed type SF fibre with 60 mm length and fibrillated virgin type PPF fibre with 19 mm length are used in this study. Meanwhile, the concrete strength is maintained for grade C30. The percentage proportion of SF-PPF fibres are varied in the range of 100-0%, 75-25%, 50-50%, 25-75% and 0-100% of which the total fibre volume fraction (Vf) is fixed at 0.5%. The experimental results reveal that the percentage proportion of SF-PPF fibres with 75-25% produced the maximum performance of flexural strength, tensile strength and flexural toughness. Meanwhile, the percentage proportion of SF-PPF fibres with 100-0% contributes to the improvement of the compressive strength compared to that of plain concrete.

Investigation of crack paths in natural fibre-reinforced composites

2015 ◽  
Author(s):  
S. Keck ◽  
M. Fulland
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Crack Growth ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Natural Fibres ◽  
Reinforced Composites ◽  
Crack Paths ◽  
Fibre Reinforced Composites

Nowadays, fibre-reinforced composite materials are widely used in many fields, e.g. automotive and aerospace. Natural fibres such as flax and hemp provide good density specific mechanical properties. Additionally, the embodied production energy in natural fibres is much smaller than in synthetic ones. Within this paper the fracture mechanical behaviour of flax fibre-reinforced composites is discussed. Especially, this paper focuses on the determination and investigation of crack paths in compact tension specimens with three different fibre directions under a static as well as fatigue load. Differences and similarities in the obtained crack paths under different loading conditions are presented. Due to the pronounced orthotropic behaviour of those materials the crack path is not only governed by the stress state, but practically determined by the fibre direction and fibre volume fraction. Therefore, the well-known stress intensity factor solutions for the standard specimens are not applicable. It is necessary to carry out extensive numerical simulations to evaluate the stress intensity factor evolution along the growing crack in order to be able to determine fatigue crack growth rate curves. Those numerical crack growth simulations are performed with the three-dimensional crack simulation program ADAPCRACK3D to gain energy release rates and in addition stress intensity factors.

The effect of microstructure of unidirectional fibre-reinforced composites on mechanical properties under transverse loading: A review

2018 ◽  
Vol 37 (22) ◽  
pp. 1360-1377 ◽  
Author(s):  
Rui Cai ◽  
Tan Jin
Keyword(s):  
Fibre Volume ◽  
Reinforced Composites ◽  
New Materials ◽  
Transverse Loading ◽  
Excellent Performance ◽  
Bonding Quality ◽  
Reinforced Plastic ◽  
Low Weight ◽  
Unidirectional Fibre ◽  
Fibre Reinforced Composites

Unidirectional fibre-reinforced composites are increasingly used in the sectors of aerospace, automotive, construction, marine and other technical applications over the decades due to their low weight, high mechanical, thermal properties and high corrosion resistance. As a result, the understanding of mechanisms of their fracture and failure under different loads especially under transverse loading are very important in order to take full advantage of their excellent performance, to optimise production procedures and to develop new materials with higher performance. This paper reviewed the effects of the microstructure of a composite material (including fibre volume, fibre distribution, bonding quality between fibres and matrix and characteristics of matrix) on the performance of fibre-reinforced plastic composites according to mechanics theories and finite element method for microstructure analysis.

A novel geometric model of four-directional 3D braided preforms

2020 ◽  
pp. 152808372091885
Author(s):  
Zunjarrao Kamble ◽  
Bijoya K Behera
Keyword(s):  
Volume Fraction ◽  
Cell Model ◽  
Geometric Model ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Unit Cell ◽  
Experimental Results ◽  
Unit Cell Model ◽  
Braiding Angle ◽  
Good Agreement

The present research reports the geometric model of four-directional 3D (4D3D) braided preform developed on four-step 3D braiding machine which consists of even and an equal number of yarn carriers in the rows and columns, respectively, on machine bed. The yarn path within the unit cell of the preform was analyzed to establish the correlation between surface braiding angle and interior braiding angle. A single unit cell model approach was used to predict the fibre volume fraction of the preform. It has been observed that the number of yarn carriers in the rows and columns is a critical parameter to decide the geometry of 4D3D braided preform. The fibre volume fraction predicted by the present model was compared with the three-unit cell model, multi-unit cell model and experimental results. A good agreement was observed between model computed results and experimental results.

An experimental study on the interdependence of mercerization, moisture absorption and mechanical properties of sustainable Phoenix sp. fibre-reinforced epoxy composites

2018 ◽  
Vol 49 (9) ◽  
pp. 1233-1251 ◽  
Author(s):  
G Rajeshkumar
Keyword(s):  
Mechanical Properties ◽  
Moisture Absorption ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Fibre Length ◽  
Fibre Volume ◽  
Epoxy Composites ◽  
Compression Moulding ◽  
Fibre Matrix ◽  
Fibre Reinforced Composites

This paper represents the first effort aimed to study the interdependence of mercerization, moisture absorption and mechanical properties of sustainable Phoenix sp. fibre-reinforced epoxy composites fabricated by compression moulding technique. The investigation was carried out by varying the fibre length (10, 20 and 30 mm), fibre volume fraction (10%, 20%, 30%, 40% and 50%), concentration of sodium hydroxide for fibre treatment (5%, 10% and 15%) and immersion temperature (10℃, 30℃ and 60℃). The fibre–matrix interface and failure mechanism was studied by using scanning electron microscopy. The results revealed that the moisture absorption rate increased with the increase in fibre length, fibre volume fraction and immersion temperature result in loss of tensile and flexural properties. The moisture absorbed samples shows 15% and 7% drop in tensile and flexural strength, respectively. However, this loss was less in mercerized fibre-reinforced composites.

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