scholarly journals MODELLING FLAX FIBRE STRETCHING AND TEARING PROCESS UNDER SINGLE AXIS LOAD

2021 ◽  
Vol 52 (2) ◽  
pp. 19-26
Author(s):  
Evgeniy L. Pashin ◽  
Aleksandr V. Orlov
Keyword(s):  
Tensile Strength ◽  
Mechanical Model ◽  
Flax Fibre ◽  
Fibrous Matrix ◽  
Observed Behaviour

The article examines existing works considering the process of tearing of flax fibre, specifically fibrous matrix and linkages within it. In particular authors point out the necessity of taking into account the destruction of individual fibres during deformation and tearing process. The end result of this analysis is a multipart mechanical model allowing for various effects that may take place during the said process. This model is implemented in software and used to model the behaviour of several strands of fibre of varying quality. The results match the observed behaviour of actual samples with similar properties, which allows using the model presented to estimate the effect various properties of flax fibre have on its tensile strength.

scholarly journals Influence of Flax Fibre Hybridization on Mechanical Behaviour of Sisal Fibre-Polypropylene Composites Prepared with an Injection Moulding Machine

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
J. Allen Jeffrey ◽  
A. Sivakumar ◽  
R. Naveen Kumar ◽  
A. Anbazhagan ◽  
G. Manojkumar ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Flax Fibre ◽  
Physical Parameters ◽  
Sisal Fibre ◽  
Polypropylene Composites ◽  
Specific Strength ◽  
Flax Fibres ◽  
Low Weight ◽  
Moulding Machine ◽  
Low Modulus

Due to their low weight, high specific strength, and low environmental impact, sisal fibre-polypropylene composites have gained popularity. However, the material has a low modulus and poor moisture resistance, among other shortcomings. This study investigated how flax fibre hybridization affects the physical parameters of sisal fibre-polypropylene composites. We used maleic anhydride-grafted polypropylene to improve compatibility between fibres and polypropylene. Adding flax fibres to polypropylene-silica composites resulted in increased tensile strength, flexibility, and impact strength, according to researchers. Water resistance was further improved by adding flax fibres. Tensile strength values of polypropylene-sisal fibre composites filled with 0, 5, 10, 15, and 20 wt% of flax fibres were 29.46, 30.56, 31.57, 33.12, and 34.64 MPa, respectively.

Bacterial Cellulose Reinforced Flax Fibre Composites: Effect of Nanocellulose Loading on Composite Properties

2015 ◽  
Vol 825-826 ◽  
pp. 1063-1067
Author(s):  
Marta Fortea-Verdejo ◽  
Elias Bumbaris ◽  
Koon Yang Lee ◽  
Alexander Bismarck
Keyword(s):  
Tensile Strength ◽  
Bacterial Cellulose ◽  
Flax Fibre ◽  
The Other ◽  
Cellulose Content ◽  
Polypropylene Composites ◽  
Flax Fibres ◽  
Paper Making ◽  
Fibre Composites ◽  
Composite Properties

Loose hierarchical flax fibres/polypropylene composites were manufactured in a simple way based on a paper-making process in order to include nanocellulose and allow the hornification of the nanofibres in a controlled manner. The effect of flax fibre content on the flax/polypropylene composites and the influence of nanocellulose on the properties of these composites are discussed. By increasing the flax content a slight decrease of the tensile strength and an increase of the Young´s modulus were observed. On the other hand, no significant effect was noticed when increasing the bacterial cellulose content in the composites.

Holding Strength of Bond to Diamond Grain within Vitrified Abrasives

2010 ◽  
Vol 177 ◽  
pp. 657-659
Author(s):  
Zheng Xin Li ◽  
Rui Zhang ◽  
Xue Feng Yang ◽  
Xiang Rong Deng
Keyword(s):  
Tensile Strength ◽  
Mechanical Model ◽  
Mathematic Model ◽  
Strength Test ◽  
Flow Diagram ◽  
Grinding Wheel ◽  
Tensile Strength Test ◽  
Calculating Method ◽  
Strength Based ◽  
Diamond Grain

This paper first analyzes the characteristics of holding strength of ceramic adhesive to diamond grains within vitrified abrasives grinding wheel, subsequently put forwards a calculating method of holding strength based on the data of the samples tensile strength test and fractography analysis. The holding strength mechanical model and the mathematic model are presented in this paper, which is figured out by load strength analyzing and idealized assumptions. Considering the holding strength computational complexity a set of software was designed to calculate the strength with the Excel data sheets exported from the tensile strength test and micro image analysis. Its flow diagram was shown in this paper.

Performance of SiO2-impregnated flax fibre reinforced polymers under wet dry and freeze thaw cycles

2020 ◽  
Vol 55 (2) ◽  
pp. 251-263
Author(s):  
Kenneth Mak ◽  
Amir Fam
Keyword(s):  
Tensile Strength ◽  
Mechanical Damage ◽  
Tensile Modulus ◽  
Flax Fibre ◽  
Short Term ◽  
Freeze Thaw ◽  
Post Exposure ◽  
Flax Fibres ◽  
Pull Out ◽  
Term Performance

Flax fibres are of growing interest as a reinforcing fibre; however, they are susceptible to moisture and have demonstrated poor bond to conventional hydrophobic resins. Although there are multiple approaches to address these issues, research has heavily focused on their short-term performance. In this research program, the performance of flax fibre reinforced polymer (FFRP), manufactured using SiO2-impregnated flax fibre, is assessed for its short-term performance as well as its long-term performance when exposed to wet-dry (WD) and freeze-thaw (FT) cycles. Treated FFRP showed improved bond between the fibre and resin as well as resistance to fibre pull-out. It exhibited a tensile strength of 144 ± 15 MPa and a tensile modulus of 8.6 ± 0.35 GPa. When exposed to WD cycles, delamination between the fibre and resin were observed. The onset of statistically significant mechanical damage occurred after four WD cycles, with a final 3% reduction in strength and a 6% reduction in modulus post-exposure. When exposed to FT cycles, FFRP experienced cracking within the fibre, as well as delamination at the interface. The onset of statistically significant mechanical damage occurred after 50 FT cycles, which manifested as a final 5% reduction in tensile strength and 10% reduction in tensile modulus post-exposure. Regardless of treatment, FFRP demonstrated the same damage mechanisms as untreated variants.

Prediction of Tensile Properties of Injection Moulding Flax Fibre Reinforced Polypropylene from Morphology Analysis

2013 ◽  
Vol 554-557 ◽  
pp. 1573-1582 ◽  
Author(s):  
Eric Lafranche ◽  
Carla Isabel Martins ◽  
Vania M. Oliveira ◽  
Patricia Krawczak
Keyword(s):  
Tensile Strength ◽  
Fibre Diameter ◽  
Fibre Length ◽  
Young Modulus ◽  
Flax Fibre ◽  
Fibre Content ◽  
Fibre Property ◽  
Fibre Shape ◽  
Shape Ratio ◽  
Diameter Distributions

The Young modulus and tensile strength of flax fibre reinforced polypropylene were determined and compared with the micromechanical models usually used in the case of short glass fibre reinforced composites. The fibre length and fibre diameter distributions of the injected reinforced of 2, 4, 8 and 22vol% compound were determined and used to the models in order to evaluate the expected properties of the composites. The mechanical properties were interpreted on the base of real fibre content, fibre orientation, fibre length and diameter distributions and morphology of the composites. The Kelly-Tyson’s model of the tensile strength prediction has been modified to take in consideration the fibre property variability due to the large distribution of fibre shape ratio induced by the process. Finally matrix modulus has been adjusted to take into account the change of crystallinity with fibre content.

In-plane tensile strength of concrete masonry

1982 ◽  
Vol 9 (3) ◽  
pp. 413-421 ◽  
Author(s):  
Robert G. Drysdale ◽  
Ahmad A. Hamid
Keyword(s):  
Tensile Strength ◽  
Test Data ◽  
Concrete Block ◽  
Relative Influence ◽  
Concrete Masonry ◽  
Tension Tests ◽  
Test Parameters ◽  
Current Design ◽  
Observed Behaviour ◽  
Important Objective

Splitting tension tests of concrete block masonry specimens were used to investigate the in-plane tensile strength of concrete block masonry. The strength and geometric properties of the blocks and of various strength grouts were included as test parameters. Explanations for the observed behaviour were suggested. In addition to providing test data for evaluating current design provisions for tension produced by combinations of in-plane loads, documentation of the relative influence of grouting is an important objective of this paper. The results indicate inconsistencies with the current design assumption that grouted blockwork is equivalent to construction with solid units. Some general conclusions related to design provisions are provided.

scholarly journals Influence of Nanofiller Dispersion on Electrical and Mechanical Properties of Epoxy Alumina Nanocomposites

2021 ◽  
Vol 31 (4) ◽  
pp. 217-225
Author(s):  
Neelmani ◽  
Ramanujam Sarathi ◽  
Hisayuki Suematsu ◽  
Toshikatsu Tanaka
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Water Droplet ◽  
High Frequency ◽  
Mechanical Model ◽  
Alumina Nanoparticles ◽  
Uniform Dispersion ◽  
Negative Effect ◽  
Modelling Studies ◽  
Inception Voltage

The electrical and mechanical properties of the epoxy alumina nanocomposites depend on the uniform dispersion of the nanofiller in the epoxy matrix. Epoxy alumina nanocomposites were prepared using 1, 3, and 5 wt% of alumina nanofiller, and electrical and mechanical properties were analyzed using experimental and modelling studies. Water droplet initiated corona inception voltage (CIV) was identified using fluorescence fiber technique and by Ultra High Frequency (UHF) technique, under AC and DC voltages. The CIV formed due to water droplet have reduced drastically with increase in number of droplets and fluorescent fiber technique found to be more sensitive to identify water droplet initiated discharges. A micro mechanical model was proposed to analyse the combined effect of the interphase and agglomeration properties of the alumina nanoparticles on the tensile strength of epoxy alumina nanocomposites. Variation in ϕagg, Eagg, and E were analysed by adopting the non-parametric distribution of alumina nanoparticles and Young’s modulus increased with the increment in the alumina nanofiller dispersion level. The presence of aggregated particles exhibits a negative effect on the tensile properties of nanocomposites.

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