scholarly journals Tensile Properties of Pandanus Atrocarpus based Composites

1970 ◽  
Vol 1 (1) ◽  
Author(s):  
Hoo Tien Nicholas Kuan ◽  
Meng Chuen Lee
Keyword(s):  
Tensile Properties ◽  
Composite Laminates ◽  
Volume Fraction ◽  
Tensile Tests ◽  
Natural Fibre ◽  
Engineering Industry ◽  
Strength Increase ◽  
Fibre Reinforcement ◽  
Compression Moulding ◽  
Composite Fabrication

Pandanus atrocarpus, or locally known as mengkuang plant is likely to be potential natural fibre reinforcement in composite. Both the Pandanus leaves, and fibres extracted from the Pandanus leaves were used in composite fabrication. Fibres were extracted from Pandanus leaves with water retting process. Pandanus composites were laminated using compression moulding method. The tensile properties of composite laminates based on lamination of Pandanus leaf- and extracted Pandanus fibre-reinforced polyethylene were investigated. Tensile tests have shown that composite laminates based on extracted Pandanus fibre reinforced polyethylene were more superior than using the Pandanus leaf itself without extracting its fibre. Tests exhibited that increasing the volume fraction of Pandanus fibre resulted in strength increase. This suggests that Pandanus fibre- based composites could offer a range of mechanical properties for use in the engineering industry.

scholarly journals Enhancement of Mechanical Properties of Flax-Epoxy Composite with Carbon Fibre Hybridisation for Lightweight Applications

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 109 ◽  
Author(s):  
Hom Nath Dhakal ◽  
Mohini Sain
Keyword(s):  
Carbon Fibre ◽  
Tensile Properties ◽  
Composite Laminates ◽  
Failure Modes ◽  
Epoxy Composite ◽  
Hybrid Composites ◽  
Environmental Scanning Electron Microscopy ◽  
Tensile Modulus ◽  
Tensile Tests ◽  
Flax Fibre

The effect of unidirectional (UD) carbon fibre hybridisation on the tensile properties of flax fibre epoxy composite was investigated. Composites containing different fibre ply orientations were fabricated using vacuum infusion with a symmetrical ply structure of 0/+45/−45/90/90/−45/+45/0. Tensile tests were performed to characterise the tensile performance of plain flax/epoxy, carbon/flax/epoxy, and plain carbon/epoxy composite laminates. The experimental results showed that the carbon/flax fibre hybrid system exhibited significantly improved tensile properties over plain flax fibre composites, increasing the tensile strength from 68.12 MPa for plain flax/epoxy composite to 517.66 MPa (670% increase) and tensile modulus from 4.67 GPa for flax/epoxy to 18.91 GPa (305% increase) for carbon/flax hybrid composite. The failure mechanism was characterised by examining the fractured surfaces of tensile tested specimens using environmental scanning electron microscopy (E-SEM). It was evidenced that interactions between hybrid ply interfaces and strain to failure of the reinforcing fibres were the critical factors for governing tensile properties and failure modes of hybrid composites.

Mechanical Behavior After Stress Relaxation in PVDF

2018 ◽  
Author(s):  
Rafael Luis Menezes Freitas ◽  
Celio Costa ◽  
Erica Gervasoni Chaves ◽  
Sylvia Teixeira
Keyword(s):  
Stress Relaxation ◽  
Tensile Properties ◽  
Room Temperature ◽  
Volume Fraction ◽  
Tensile Tests ◽  
Yield Strain ◽  
Cooling Temperature ◽  
Cooling Conditions ◽  
C 23 ◽  
Processing Stress

This study presents the mechanical properties evaluation of two commercial grades of PVDFs, which were extruded with the same parameters but with different cooling temperatures. After processing, stress relaxation with 7% strain was imposed and tensile properties were measured. The cooling temperature after extrusion were 4°C, 23°C and 80°C. Then, the PVDFs were submitted to stress relaxation at 23°C and 7% strain. The as processed and after relaxation samples were characterized by FTIR, XRD, DSC and tensile tests at 23°C. The stress relaxation at 23 °C resulted in no change in volume fraction of crystallinity for PVDF A and B. The XRD and FTIR, for both PVDFs, showed that the crystalline phases were the same, for all cooling conditions and did not change after the stress relaxation. The tensile properties at room temperature showed that the yield stress was a little affect by the cooling temperature, while Young’s Modulus and yield strain were insensible to the cooling temperature. After the stress relaxation, these three tensile properties were slightly affected for both grades.

Mechanical characterization and damage events of flax fabric-reinforced biopolymer composites

2019 ◽  
Vol 28 (8-9) ◽  
pp. 631-644
Author(s):  
Abderrazak Chilali ◽  
Mustapha Assarar ◽  
Wajdi Zouari ◽  
Hocine Kebir ◽  
Rezak Ayad
Keyword(s):  
Tensile Modulus ◽  
Tensile Tests ◽  
Natural Fibre ◽  
Poly Lactic Acid ◽  
Fibre Reinforcement ◽  
Butylene Succinate ◽  
Environment Friendly ◽  
Biodegradable Composite ◽  
Biodegradable Poly ◽  
Biopolymer Composites

Natural fibre-reinforced biopolymer composites are of special interest because they are entirely bioresourced, recyclable and biodegradable. Poly(lactic acid) (PLA), poly(hydroxybutyrate- co-hydroxyvalerate) (PHBV) and poly(butylene succinate) (PBS) are among the most known environment-friendly biodegradable thermoplastics. Unfortunately, they present unbalanced mechanical characteristics when they are taken separately. The aim of this work is to overcome this problem using a blending process accompanied with fibre reinforcement. For this purpose, entirely biodegradable composite materials were fabricated and characterized. These biocomposites are based on two different ternary PLA/PHBV/PBS blends reinforced with twill flax fabrics and fabricated using extrusion and film-stacking techniques. Monotonic and cyclic load–unload tensile tests followed by acoustic emission and scanning electron microscopy observations were performed. In particular, the obtained biocomposites present interesting mechanical properties with a tensile modulus of 20 GPa and an ultimate tensile strength of 110 MPa.

scholarly journals Fabrication of Aramid Fiber Knitted Fabric Reinforced Polypropylene Composites

1998 ◽  
Vol 7 (3) ◽  
pp. 096369359800700 ◽  
Author(s):  
N.K. Cuong ◽  
Z. Maekawa
Keyword(s):  
Tensile Properties ◽  
Composite Laminates ◽  
Tensile Tests ◽  
Compression Molding ◽  
Aramid Fiber ◽  
Molding Pressure ◽  
Knitted Fabric ◽  
Aramid Fibers ◽  
Polypropylene Composites ◽  
Impregnation Time

In this paper, the effects of fabrication conditions on mechanical properties of aramid fiber knitted fabric reinforced thermoplastic polypropylene composites have been investigated. Composite laminates were fabricated by variation of impregnation time and compression molding pressures. Impregnation of matrix resin into aramid fibers was identified by observing cross-sections of laminates. Tensile tests were carried out on samples cut from the laminates parallel to the wale and course directions. Tensile properties increased with increasing the impregnation time or the compression molding pressure. The tensile properties also display higher in wale direction than in course direction. SEM micrographs of fractured surfaces reveal poor adhesion between aramid fibers and polypropylene matrix.

Tensile Strength of Untreated Napier Grass Fibre Reinforced Unsaturated Polyester Composites

2014 ◽  
Vol 554 ◽  
pp. 189-193 ◽  
Author(s):  
J.A. M. Haameem ◽  
M.S. Abdul Majid ◽  
E.A.H. Engku Ubaidillah ◽  
Mohd Afendi ◽  
R. Daud ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Composite Laminates ◽  
Unsaturated Polyester ◽  
Tensile Tests ◽  
Natural Fibre ◽  
Maximum Strength ◽  
Napier Grass ◽  
Fibre Composites ◽  
Polyester Composite ◽  
Polyester Composites

This paper describes the experimental investigation of the tensile strength of untreated Napier grass fibre reinforced polyester composites. Napier grass fibres were extracted trough conventional water retting process and used as reinforcing materials in the polyester composite laminates. Tensile tests were then conducted for the composite specimens from the laminates at 25% fibre loading using the electronic extensometer setup to obtain the tensile properties. The results show significant differences in tensile strength between random short fibres laminates and random long fibre laminates with the long fibres yield almost 45 % higher in the strength. The laminates also show higher maximum strength compared to other commonly available natural fibre composites with over 70 % increase in the maximum strength compared to the short kenaf fibre reinforced composites.

scholarly journals Effect of Fiber Orientation on the Tensile Properties of Jute Epoxy Laminated Composite

2012 ◽  
Vol 5 (1) ◽  
pp. 43-54 ◽  
Author(s):  
R. M. Hossain ◽  
A. Islam ◽  
A. W. Van Vuure ◽  
V. Ignaas
Keyword(s):  
Tensile Strength ◽  
Tensile Properties ◽  
Volume Fraction ◽  
Laminated Composite ◽  
Tensile Tests ◽  
Experimental Results ◽  
Jute Fiber ◽  
Longitudinal Tensile Strength ◽  
Resin Infiltration ◽  
Composite Field

Jute, the pride of Bangladesh, has gained interest in the composite field due to its superior specific properties compared to artificial manmade fibers like glass, kevlar, etc. In this study, jute composites made with the vacuum assisted resin infiltration (VARI) techniques were investigated. Jute fiber preform stacking sequences were (0/0/0/0), 0/+45°/-45°/0 and 0/90°/90°/0. For all cases, a total of 25% volume fraction of jute fiber was incorporated. The developed composites were characterized by tensile tests and the experimental results thus obtained were compared with that of the theoretical values. After tensile tests, fracture surfaces were cut and observed under high resolution FEG SEM.  In the case of 0/0/0/0 and 0/+45°/-45°/0 lamina composites, longitudinal tensile strength has been found to be higher than that of the transverse direction. However, for 0/90°/90°/0 lamina composites, tensile strengths in both directions were very close to each other. For all developed composites, experimental results revealed that the tensile properties of the developed composites strongly depend on the tensile strength of jute fiber and that the tensile properties of jute fiber are very much defect-sensitive. Finally, a discussion of the tensile behaviors of the composites is initiated in terms of the fracture morphologies observed under the SEM.© 2013 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v5i1.10519        J. Sci. Res. 5 (1), 43-54 (2013) 

scholarly journals Evaluation of Tensile Properties and Damage of Continuous Fibre Reinforced 3D-Printed Parts

2018 ◽  
Vol 774 ◽  
pp. 161-166 ◽  
Author(s):  
Octavio Andrés González-Estrada ◽  
Alberto Pertuz ◽  
Jabid E. Quiroga Mendez
Keyword(s):  
3D Printing ◽  
Tensile Properties ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Tensile Tests ◽  
Fused Deposition Modelling ◽  
Printing Process ◽  
Fused Deposition ◽  
3D Printed

Three-dimensional (3D) printing technology has been traditionally used for the production of prototypes. Recently, developments in 3D printing using Fused Deposition Modelling (FDM) and reinforcement with continuous fibres (fiberglass and carbon fibre), have allowed the manufacture of functional prototypes, considerably improving the mechanical performance of the composite parts. In this work, we characterise the elastic tensile properties of fibre reinforced specimens, considering the variation of several parameters available during the printing process: fibre orientation, volume fraction, fill pattern, reinforcement distribution. Tensile tests were performed according to ASTM D638 to obtain Young’s modulus and ultimate strength for different material configurations available during the printing process. We also perform a fractographic analysis using Scanning Electron Microscopy (SEM) to give an insight of the failure mechanisms present in the specimens.

scholarly journals The Elastic Properties of Unidirectional Bamboo Fibre Reinforced Epoxy Composites

2019 ◽  
Vol 8 (3) ◽  
pp. 7187-7193
Keyword(s):  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Three Dimensional ◽  
Weight Ratio ◽  
Natural Fibre ◽  
Fibre Volume ◽  
Good Choice ◽  
Fibre Reinforcement ◽  
Bamboo Fibre ◽  
Structural Applications

Natural fibres such as kenaf, jute, bamboo, flax and wood have been the subject of intensive researches in the area of fibre reinforced composite due to their environmental advantages of being renewable, biodegradable and sustainable. Bamboo fibre can be a good choice of natural fibre reinforcement for structural applications due to its excellent strength to weight ratio that is comparable to that of mild steel. In this study, mechanical properties of both continuous and short bamboo fibre reinforced composites are predicted using micromechanical approaches. The finite element method was used where three-dimensional micromechanical representative volume element with square and hexagonal packing geometry was implemented. The results were then compared with the findings from analytical approach that includes the rule of mixture and the Halpin-Tsai model. It was found that for all properties, the FEM and analytical methods give comparable trends of property on volume fraction plots. Furthermore, the longitudinal modulus given by all models are in excellent agreement as it increases linearly with the increase in bamboo fibre volume fraction.

Effect of α2 Precipitation on Creep and Tensile Properties of Ga-Added Near-α Titanium Alloys

2018 ◽  
Vol 941 ◽  
pp. 747-752 ◽  
Author(s):  
Tomonori Kitashima ◽  
Masuo Hagiwara ◽  
Tsutomu Ito ◽  
Masao Hayakawa ◽  
Satoshi Iwasaki
Keyword(s):  
Tensile Properties ◽  
Creep Strain ◽  
Room Temperature ◽  
Volume Fraction ◽  
Tensile Elongation ◽  
Lamellar Microstructure ◽  
Tensile Tests ◽  
Strain Rates ◽  
Bimodal Microstructure ◽  
Creep Tests

The effect of α2precipitation on the creep and tensile properties was investigated for bimodal and lamellar microstructures in two Ga-added near-α Ti alloys with Al equivalences of 10.6 and 11.5. Fine α2phase formed in the α phase of both alloys. The volume fraction of the α2phase for the Al equivalences of 10.6 and 11.5 is equivalent to 57.6 % and 73.3 %, respectively, in the binary Ti-Al system at 600 °C. Creep tests were carried out under a constant stress of 310 MPa at 600 °C and tensile tests were performed at room temperature. Lamellar microstructure showed lower minimum creep strain rates than bimodal microstructure for both alloys. The increase in Al equivalence increased creep life by a factor of 1.6 and decreased the minimum creep strain rate from 6.51 × 10-8s-1to 3.99 × 10-8s-1in bimodal microstructure. In addition, the increase in Al equivalence decreased room temperature tensile elongation although both alloys contained a similar volume fraction of equiaxed α in a bimodal microstructure.

Effect of internal pores on tensile properties of Co-Cr-Mo alloy fabricated by selective laser melting

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hyeon-Tae Im ◽  
Hyun-Su Kang ◽  
Hyeon-Goo Kang ◽  
Hyo Kyu Kim ◽  
Jun Choi ◽  
...  
Keyword(s):  
Tensile Properties ◽  
Selective Laser Melting ◽  
Volume Fraction ◽  
Tensile Deformation ◽  
Hot Isostatic Pressing ◽  
Tensile Tests ◽  
Laser Melting ◽  
Content Type ◽  
Tensile Deformation Behavior ◽  
Ε Phase

Purpose The purpose of this paper is to examine the effect of internal pores on the tensile properties of a Co–Cr–Mo alloy fabricated by selective laser melting (SLM). Design/methodology/approach The size and volume fraction of pores were controlled through high temperature annealing (HTA) and hot isostatic pressing (HIP). Findings After HTA, the size and fraction of pores decreased compared with the as-built SLM sample, and no pores were observed after HIP. Tensile tests of the HTA and HIP samples showed nearly similar tensile deformation behavior. From the results, the authors found that the size of the internal pores formed in the SLM process had little effect on the tensile properties. The as-built SLM sample had less elongation than the HTA and HIP samples, which would not the effect of porosity, but rather the effect of the residual stress and the retained ε phase after the SLM process. Originality/value Although pores are a main factor that influence the mechanical properties, the effect of pores on the tensile properties of Co–Cr–Mo alloys fabricated by SLM has not been studied. Therefore, in this study, the effect of pores on the tensile properties of a Co–Cr–Mo alloy fabricated by SLM was studied.

Sign in / Sign up

Export Citation Format

Share Document