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Journal articles on the topic 'Stress fibres'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Arjyal, Bish, and Costas Galiotis. "Localised Stress Measurements in Composite Laminates Using a Raman Stress Sensor." Advanced Composites Letters 4, no. 2 (1995): 096369359500400. http://dx.doi.org/10.1177/096369359500400203.

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A new remote laser Raman stress/ strain sensor for localised measurements in polymer based composites, has been developed and tested. Measurements can be conducted in reinforcing fibres near the surface of laminates. For measurements in the bulk of composites, the exciting laser light has to be transported to the reinforcing fibres via an embedded fibre optic cable. The backscattered light is transmitted through the same fibre optic and is sent to the Raman spectrometer for analysis. The effect of the direction of the fibre optic cable with respect to the axis of the reinforcing fibres is exam

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2

Schiek, Richard L., and Eric S. G. Shaqfeh. "A nonlocal theory for stress in bound, Brownian suspensions of slender, rigid fibres." Journal of Fluid Mechanics 296 (August 10, 1995): 271–324. http://dx.doi.org/10.1017/s0022112095002138.

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A nonlocal theory for stress in bound suspensions of rigid, slender fibres is developed and used to predict the rheology of dilute, rigid polymer suspensions when confined to capillaries or fine porous media. Because the theory is nonlocal, we describe transport in a fibre suspension where the velocity and concentration fields change rapidly on the fibre's characteristic length. Such rapid changes occur in a rigidly bound domain because suspended particles are sterically excluded from configurations near the boundaries. A rigorous no-flux condition resulting from the presence of solid boundari

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3

Pellegrin, S., and H. Mellor. "Actin stress fibres." Journal of Cell Science 120, no. 20 (2007): 3491–99. http://dx.doi.org/10.1242/jcs.018473.

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4

Munir, Muhammad Junaid, Syed Minhaj Saleem Kazmi, Yu-Fei Wu, Xiaoshan Lin, and Muhammad Riaz Ahmad. "Axial Stress-Strain Performance of Recycled Aggregate Concrete Reinforced with Macro-Polypropylene Fibres." Sustainability 13, no. 10 (2021): 5741. http://dx.doi.org/10.3390/su13105741.

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The addition of macro-polypropylene fibres improves the stress-strain performance of natural aggregate concrete (NAC). However, limited studies focus on the stress-strain performance of macro-polypropylene fibre-reinforced recycled aggregate concrete (RAC). Considering the variability of coarse recycled aggregates (CRA), more studies are needed to investigate the stress-strain performance of macro-polypropylene fibre-reinforced RAC. In this study, a new type of 48 mm long BarChip macro-polypropylene fibre with a continuously embossed surface texture is used to produce BarChip fibre-reinforced

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5

Schiek, Richard L., and Eric S. G. Shaqfeh. "Cross-streamline migration of slender Brownian fibres in plane Poiseuille flow." Journal of Fluid Mechanics 332 (February 1997): 23–39. http://dx.doi.org/10.1017/s0022112096003291.

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We consider fibre migration across streamlines in a suspension under plane Poiseuille flow. The flow investigated lies between two infinite, parallel plates separated by a distance comparable to the length of a suspended fibre. We consider the weak flow limit such that Brownian motion strongly affects the fibre position and orientation. Under these conditions, the fibre distribution, fibre mobility and fluid velocity field all vary on scales comparable to the fibre's length thus complicating a traditional volumeaveraging approach to solving this problem. Therefore, we use a non-local derivatio

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6

Ridley, Anne J. "Stress fibres take shape." Nature Cell Biology 1, no. 3 (1999): E64—E66. http://dx.doi.org/10.1038/11034.

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7

Willson, Joseph. "Stress fibres fuel glycolysis." Nature Reviews Molecular Cell Biology 21, no. 4 (2020): 180. http://dx.doi.org/10.1038/s41580-020-0224-1.

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8

Vallenius, Tea. "Actin stress fibre subtypes in mesenchymal-migrating cells." Open Biology 3, no. 6 (2013): 130001. http://dx.doi.org/10.1098/rsob.130001.

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Mesenchymal cell migration is important for embryogenesis and tissue regeneration. In addition, it has been implicated in pathological conditions such as the dissemination of cancer cells. A characteristic of mesenchymal-migrating cells is the presence of actin stress fibres, which are thought to mediate myosin II-based contractility in close cooperation with associated focal adhesions. Myosin II-based contractility regulates various cellular activities, which occur in a spatial and temporal manner to achieve directional cell migration. These myosin II-based activities involve the maturation o

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9

Yan, Cheng, and Sidney Mindess. "Bond between epoxy-coated reinforcing bars and concrete under impact loading." Canadian Journal of Civil Engineering 21, no. 1 (1994): 89–100. http://dx.doi.org/10.1139/l94-009.

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The bond between epoxy-coated reinforcing bars and concrete under static, high strain rate, and impact loading was studied for plain concrete, polypropylene fibre reinforced concrete, and steel fibre reinforced concrete. The bond stress, slip, crack development, the bond stress–slip relationship, and the fracture energy during the bond-slip process were investigated experimentally. The results were compared with those for uncoated reinforcing bars. It was found that for epoxy-coated rebars, the bond resistance decreased, in terms of the maximum local bond stress and the average bond stress; wi

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10

Aksak, Burak, Chung-Yuen Hui, and Metin Sitti. "The effect of aspect ratio on adhesion and stiffness for soft elastic fibres." Journal of The Royal Society Interface 8, no. 61 (2011): 1166–75. http://dx.doi.org/10.1098/rsif.2010.0582.

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The effect of aspect ratio on the pull-off stress and stiffness of soft elastic fibres is studied using elasticity and numerical analysis. The adhesive interface between a soft fibre and a smooth rigid surface is modelled using the Dugdale–Barenblatt model. Numerical simulations show that, while pull-off stress increases with decreasing aspect ratio, fibres get stiffer. Also, for sufficiently low aspect ratio fibres, failure occurs via the growth of internal cracks and pull-off stress approaches the intrinsic adhesive strength. Experiments carried out with various aspect ratio polyurethane ela

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11

Zhang, Xidong, and Adrian R. Russell. "Drained volumetric behaviour and static liquefaction of very loose sand reinforced with synthetic fibres." E3S Web of Conferences 92 (2019): 12001. http://dx.doi.org/10.1051/e3sconf/20199212001.

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Synthetic fibres may be used to reinforce soils. Fibre reinforcement may, for example, improve the mechanical behaviour of very loose sand which is usually susceptible to static liquefaction. In this study, two types of polypropylene fibres are mixed into sand to explore the effect of fibre reinforcement on drained volumetric behaviour and undrained static liquefaction. Drained and undrained stress-controlled triaxial compression tests are conducted on both unreinforced and fibre reinforced samples which are in very loose states. It is observed that, under drained compression, both unreinforce

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12

Lu, Chun, Ping Chen, and Baijie Yu. "Computer Simulation of Thermal Residual Stress of Carbon Fibre/Ppesk Composite." Advanced Composites Letters 16, no. 1 (2007): 096369350701600. http://dx.doi.org/10.1177/096369350701600104.

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A 3-D FEA technique was employed to analyze the thermal stress distribution in a carbon fibre/PPESK composite. The zone close to the free surface and to the inner zone were examined, and the parabolic failure criterion was used to predict the potential failure zone of the composite. The obtained results indicated that the maximum residual stress on the fibre surface was located at the fibre/matrix interface with the longest distance between the fibres and the maximum matrix residual stress was located at the composite inner zone with the closest distance between the fibres. The potential failu

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13

Vigliotti, A., R. M. McMeeking, and V. S. Deshpande. "Simulation of the cytoskeletal response of cells on grooved or patterned substrates." Journal of The Royal Society Interface 12, no. 105 (2015): 20141320. http://dx.doi.org/10.1098/rsif.2014.1320.

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We analyse the response of osteoblasts on grooved substrates via a model that accounts for the cooperative feedback between intracellular signalling, focal adhesion development and stress fibre contractility. The grooved substrate is modelled as a pattern of alternating strips on which the cell can adhere and strips on which adhesion is inhibited. The coupled modelling scheme is shown to capture some key experimental observations including (i) the observation that osteoblasts orient themselves randomly on substrates with groove pitches less than about 150 nm but they align themselves with the

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14

Trojanová, Zuzanka, and Zoltán Száraz. "Mechanical Properties of AS21 Magnesium Alloy Based Composites." Materials Science Forum 482 (April 2005): 363–66. http://dx.doi.org/10.4028/www.scientific.net/msf.482.363.

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The high temperature behaviour of composites with the AS21 magnesium alloy matrix, reinforced by short Saffil fibres was investigated in the temperature interval from room temperature to 300 °C. The yield stress and the maximum stress decrease with increasing temperature. Two types of specimens were investigated – one with fibres plane oriented parallel to the stress axis and the other with perpendicular fibres plane orientation. Light and scanning electron microscopy were used for study of the microstructure of composites. Possible hardening and softening mechanisms are discussed. The shear s

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15

Meena, T., G. Elangovan, and R. Ganesh. "Mechanical Properties and Stress-Strain Behaviour of Hybrid Fibre-Reinforced Self-Compacting Concrete." Advanced Materials Research 984-985 (July 2014): 677–83. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.677.

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Self-Compacting Concrete (SCC) is a highly flowable, self-levelling concrete. Just as in Fibre Reinforced Concrete (FRC), fibres can be incorporated into SCC also to get FRSCC. In the present study hybrid fibres namely, Polypropylene and hooked ended Steel fibres are incorporated in different volume fractions and their fresh and hardened state properties have been studied. Fly ash and Silica Fume obtained as waste from industries are used as replacement for cement, the replacement being 10% and 5% respectively. The behaviour of HFRSCC under compression, tension and flexure has been experimenta

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16

Giannopoulos, I. P., and C. J. Burgoyne. "Stress limits for aramid fibres." Proceedings of the Institution of Civil Engineers - Structures and Buildings 162, no. 4 (2009): 221–32. http://dx.doi.org/10.1680/stbu.2009.162.4.221.

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17

Hamza, A. A., I. M. Fouda, K. A. El-Farhaty, and S. A. Helaly. "Stress birefringence in polypropylene fibres." Polymer Testing 7, no. 5 (1987): 329–43. http://dx.doi.org/10.1016/0142-9418(87)90013-4.

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18

Palanivel, S., and M. Sekar. "Experimental and Numerical Investigation on Stress-Strain Relationships of GFRP and Lateral Ties Confined Polyolefin Fibre Reinforced Concrete under Monotonic Axial Compression." Applied Mechanics and Materials 253-255 (December 2012): 466–73. http://dx.doi.org/10.4028/www.scientific.net/amm.253-255.466.

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In this investigation, the combined confinement effect of spacing of lateral ties, volume fraction of polyolefin fibres and fibre reinforced polymer(FRP) wraps was studied both experimentally and analytically from the point of deformability characteristics of concrete for seismic resistance. Low modulus synthetic fibers such as polyolefin based fibers, it is shown that polyolefin fibers with sufficient tensile strength can successfully enhance the mechanical properties of concrete. The mechanism of delaying and arresting the progressive internal cracking by the fibres can be made use in passiv

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19

Pauw, Brian R., Martin E. Vigild, Kell Mortensen, Jens W. Andreasen, and Enno A. Klop. "A tensile stage for high-stress low-strain fibre studies." Journal of Applied Crystallography 44, no. 6 (2011): 1297–99. http://dx.doi.org/10.1107/s0021889811042373.

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Determining the effects of stress on the internal structure of high-performance fibres may provide insight into their structure–property relationships. The deformation of voids inside a poly(p-phenylene terephthalamide) (PPTA) fibre upon application of stress is one such effect which may be observed usingin situsmall-angle X-ray scattering. For this purpose, a compact in-vacuum stretching device is described here, capable of applying a force of up to 500 N using specially designed fibre clamps. Furthermore, a small radiative heater is placed around the fibre at the measurement position, so tha

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20

Cheney, Jorn A., Nicolai Konow, Andrew Bearnot, and Sharon M. Swartz. "A wrinkle in flight: the role of elastin fibres in the mechanical behaviour of bat wing membranes." Journal of The Royal Society Interface 12, no. 106 (2015): 20141286. http://dx.doi.org/10.1098/rsif.2014.1286.

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Bats fly using a thin wing membrane composed of compliant, anisotropic skin. Wing membrane skin deforms dramatically as bats fly, and its three-dimensional configurations depend, in large part, on the mechanical behaviour of the tissue. Large, macroscopic elastin fibres are an unusual mechanical element found in the skin of bat wings. We characterize the fibre orientation and demonstrate that elastin fibres are responsible for the distinctive wrinkles in the surrounding membrane matrix. Uniaxial mechanical testing of the wing membrane, both parallel and perpendicular to elastin fibres, is used

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21

de Paula, Thaís Martins, Nilo Cesar Consoli, Lucas Festugato, Filipe Favretto, and João Victor Linch Daronco. "Behaviour of fibre-reinforced cemented sand under flexural tensile stress." E3S Web of Conferences 92 (2019): 12005. http://dx.doi.org/10.1051/e3sconf/20199212005.

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In soil improvement, the insertion of cement to the soil matrix provides an increase in strength and rigidity of the material, whereas fibre addition provides an increase in ductility, reducing post-peak loss in strength. This research aims to experimentally analyse the mechanical behaviour of unreinforced and fibre-reinforced cemented sands under flexural tensile monotonic loading conditions. In order to do so, an experimental program was planned using silty sand (Arenito Botucatu), early strength Portland cement – CPIII, and polypropylene fibres 24 mm long and 0.023 mm thick. Three different

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22

Peijs, A. A. J. M., H. J. Schellens, and L. E. Govaert. "Creep behaviour of Hybrid Composites Based on Polyethylene and Carbon Fibres." Advanced Composites Letters 2, no. 6 (1993): 096369359300200. http://dx.doi.org/10.1177/096369359300200602.

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This study investigates the effect of hybridization of high-performance polyethylene (HP-PE) fibres reinforced composites with carbon fibres on the creep behaviour of the resulting hybrid composites. Interesting hybrid effects were related to a lowering of the stress level in the HP-PE fibres upon hybridization and creep, eliminating the plastic flow contribution in the HP-PE fibre.

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23

Koroteeva, L. I., A. V. Sharonov, P. A. Astakhov, N. A. Mironov, and A. V. Sergeeva. "The Design of Composite Materials of Prescribed Structure and Properties." International Polymer Science and Technology 44, no. 7 (2017): 17–20. http://dx.doi.org/10.1177/0307174x1704400704.

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The structure and properties of a composite material (basalt-fibre-reinforced plastic) reinforced by chaotically distributed discrete fibres were determined at the design stage with account taken of the fibre diameter, the critical length of the fibres, the arrangement of fibres within the matrix, and the stress distribution over the length of the fibres. The results of calculation were used in the manufacture of specimens of thermoplastic polymeric material by the developed technology. The given results of experimental investigation of specimens of the thermoplastic material showed that the c

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24

Xu, Zhuo, Hong Hao, and Hong Nan Li. "Influence of Fibre Shapes on Dynamic Compressive Behaviour of Fibre Reinforced Concrete." Applied Mechanics and Materials 82 (July 2011): 112–17. http://dx.doi.org/10.4028/www.scientific.net/amm.82.112.

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In this paper results are reported of impact tests performed to study the influence of different fibre types on dynamic compressive properties of fibre reinforced concrete (FRC). FRC specimens are prepared with the same concrete and 1% of fibres of different types. The compressive impact tests are conducted with an instrumented drop weight impact system consisting of a hard steel drop weight, two 180t fast response loadcells, a high speed video camera, and a fast response data acquisition system. In this study, six fibre types with different shapes and material properties are considered. They

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25

Ajayi, Olufemi, Louis Le Pen, Antonis Zervos, and William Powrie. "Scaling relationships for strip fibre–reinforced aggregates." Canadian Geotechnical Journal 54, no. 5 (2017): 710–19. http://dx.doi.org/10.1139/cgj-2016-0346.

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Previous research on random fibre-reinforced granular materials has shown that the relative dimensions of the grains and fibres significantly affect the macromechanical behaviour of the mixture. However, quantitative data are scarce and most previous work has focused on fine to medium sands, leaving uncertainties regarding the applicability of current knowledge to larger size aggregates such as railway ballast. In this paper, triaxial test data on 1/3 and 1/5 scale railway ballast are used to develop scaling relationships for the size and quantity of fibres needed to achieve the same reinforci

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26

Jiang, Zhaohui, Zengge Guo, Congcong Pu, et al. "Preparation and properties of melt-spinning fluorinated ethylene propylene fibres." High Performance Polymers 29, no. 4 (2016): 476–83. http://dx.doi.org/10.1177/0954008316651689.

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In this work, a novel fibre, fluorinated ethylene propylene (FEP) filament, was fabricated by melt-spinning. In addition, the properties of FEP fibres were investigated through apparent morphological observation, tensile testing, dry-hot shrinkage, differential scanning calorimetry, thermogramitric analysis (TGA) and Fourier transform infrared spectroscopy. Apparent morphological observation shows that FEP fibres present circular cross-sections and smooth surfaces. Just like the conventional fibres prepared by melt-spinning, such as poly (ethylene terephthalate) (PET) and polyamide 6, the stre

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27

Snook, Braden, Levi M. Davidson, Jason E. Butler, Olivier Pouliquen, and Élisabeth Guazzelli. "Normal stress differences in suspensions of rigid fibres." Journal of Fluid Mechanics 758 (October 9, 2014): 486–507. http://dx.doi.org/10.1017/jfm.2014.541.

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AbstractMeasurements of normal stress differences are reported for suspensions of rigid, non-Brownian fibres for concentrations of $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}nL^2d=1.5\text {--}3$ and aspect ratios of $L/d=11\text {--}32$, where $n$ is the number of fibres per unit volume, $L$ is the fibre length and $d$ is the diameter. The first and second normal stress differences are determined experimentally from measurin

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28

Zivkovic, Jelena, and Jan Arve Øverli. "Failure of Lightweight Aggregate Concrete in Compression under Stress Gradients." Nordic Concrete Research 60, no. 1 (2019): 51–66. http://dx.doi.org/10.2478/ncr-2019-0011.

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Abstract The objective of this experiment is to investigate the behaviour of lightweight aggregate concrete (LWAC) under compression and with stress gradients. Experimental program contained three sets of LWAC which were used for production of 21 prisms. Lightweight aggregate argillite slate, called Stalite, from North Carolina had been used. The sets differed in using dry (0.10% moisture content) or saturated (7.9% moisture content) aggregate. The third set included a small amount of polyvinyl alcohol fibres (PVA). The geometry of the prisms were 100 × 140 × 480 mm (width × length × height).

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29

Saravanan, K. G., R. Prabu, A. Sivapragasam, and Nahom Daniel. "Comparative Analysis of Natural Fibre Reinforced Composite Material Using ANSYS." Advances in Materials Science and Engineering 2021 (August 31, 2021): 1–17. http://dx.doi.org/10.1155/2021/9391237.

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The regulations of legislative bodies regarding the recycling and reusage of automotive materials has caused a great deal of obligation among automotive manufacturers to use natural fibres or green composites. Green composites or more commonly known as bio-composites are made up of natural fibres. Natural fibres are used by humankind since prehistoric times. The natural fibre is obtained from plants as well as animals. Since the natural fibre is obtained from natural as well as biological resources, it is biodegradable and recyclable. This paper presents the study and analysis conducted to add

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30

Van Den Oever, M. J. A., and H. L. Bos. "Critical Fibre Length and Apparent Interfacial Shear Strength of Single Flax Fibre Polypropylene Composites." Advanced Composites Letters 7, no. 3 (1998): 096369359800700. http://dx.doi.org/10.1177/096369359800700303.

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The stress transfer in, both elementary and technical, single flax fibre polypropylene composites is studied by determining the critical fibre length and the apparent interfacial shear strength. The influence of improved fibre-matrix interaction is reported and the results are compared with data from literature. The study indicates that the critical fibre length for elementary flax fibres is equal to or even higher than the flax fibre lengths found after extrusion and injection moulding processes. Furthermore, addition of maleic anhydridy modified polypropylene to the matrix results in an appa

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31

Šuba, Oldřich, Libuše Sýkorová, and Ondrej Bilek. "Stress Modelling in Curved Parts of Short Fibres Reinforced Plastic Products." Key Engineering Materials 581 (October 2013): 497–500. http://dx.doi.org/10.4028/www.scientific.net/kem.581.497.

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An investigation was carried out through a study of the influence of material anisotropy of the rounded corners of thin-walled plastic injection molded products reinforced by short-fibres, on the state of stress. It has been shown that the result of such injection-moulded processes is an anisotropic and layered product, whose mechanical behaviour differs for that of isotropic and homogenous solids. Unlike unreinforced plastics, fibre composites exhibit secondary stress effects thus need to be careful consideration in the course in designing of short fibres reinforced plastic products.

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32

Mahzan, Shahruddin, Wahieda M. Bahtiar, and Zaleha Mohamad. "Investigation on the Tensile Strength of Treated and Untreated Woven Sugar Palm Fibre Reinforced Composites." Applied Mechanics and Materials 660 (October 2014): 588–92. http://dx.doi.org/10.4028/www.scientific.net/amm.660.588.

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Natural fibres offer environmental benefits such as biodegradable and can be obtained from renewable resources. However, there is lack of investigations done to characterize and compare different types and orientation done on the natural fibres. This paper determines the tensile strength of sugar palm fibres under various treatment processes. The composites were fabricated using woven sugar-palm fibre treated with alkali and acid and used epoxy resin as the matrices for the composite. The tensile test was done to determine the tensile strength of the composite and the surface morphological ana

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33

Guo, Y., C. Wassgren, B. Hancock, W. Ketterhagen, and J. Curtis. "Computational study of granular shear flows of dry flexible fibres using the discrete element method." Journal of Fluid Mechanics 775 (June 16, 2015): 24–52. http://dx.doi.org/10.1017/jfm.2015.289.

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In this study, shear flows of dry flexible fibres are numerically modelled using the discrete element method (DEM), and the effects of fibre properties on the flow behaviour and solid-phase stresses are explored. In the DEM simulations, a fibre is formed by connecting a number of spheres in a straight line using deformable and elastic bonds. The forces and moments induced by the bond deformation resist the relative normal, tangential, bending and torsional movements between two bonded spheres. The bond or deforming stiffness determines the flexibility of the fibres and the bond damping account

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34

Reis, PJ. "Variations in the strength of wool fibres - A review." Australian Journal of Agricultural Research 43, no. 6 (1992): 1337. http://dx.doi.org/10.1071/ar9921337.

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This review outlines the factors that may influence the strength of wool fibres and the associated changes in structure and protein composition that have been observed in weakened fibres. The strength of a wool staple is dependent on the intrinsic strength of the fibres that it contains and the total cross-sectional area of fibre being tested. The minimum fibre diameter and the rate of change of diameter along a staple are important determinants of strength. Different sheep kept under similar conditions show a large range of staple strengths. Estimates of heritability for staple strength are s

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35

Mostafa, Nawras H., ZN Ismarrubie, SM Sapuan, and MTH Sultan. "Fibre prestressed polymer-matrix composites: a review." Journal of Composite Materials 51, no. 1 (2016): 39–66. http://dx.doi.org/10.1177/0021998316637906.

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This article reviews the literature studies based on improving the mechanical properties of fibre-reinforced composites using fibre-prestressing method. The idea is characterized by pretensioning the fibres either elastically or viscoelastically prior matrix curing. The beginnings of the studies in this field were focused on reducing fibre waviness and breaking the weaker fibres by pretensioning the fibres to a relatively high stress level prior moulding process. In the last three decades, the concept of fibre prestressing had been developed to include its ability to reduce the effect of undes

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36

Psarras, G. C., J. Parthenios, D. Bollas, and C. Galiotis. "Stress and temperature self-sensing fibres." Chemical Physics Letters 367, no. 3-4 (2003): 270–77. http://dx.doi.org/10.1016/s0009-2614(02)01683-4.

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37

ALLEN, S. "Stress-coupling phenomena in anisotropic fibres." Polymer 29, no. 6 (1988): 1091–94. http://dx.doi.org/10.1016/0032-3861(88)90020-1.

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38

Mo, Kim Hung, U. Johnson Alengaram, and Mohd Zamin Jumaat. "Compressive Behaviour of Polyarcylonitrile Fibre Reinforced Lightweight Aggregate Concrete Composite." Advanced Materials Research 1115 (July 2015): 188–91. http://dx.doi.org/10.4028/www.scientific.net/amr.1115.188.

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In this paper, the effect of polyacrylonitrile (PAN) fibre addition at 0%, 0.1% and 0.2% volume fraction on the compressive behaviour such as compressive strength, residual strength upon heat exposure and compressive stress-strain relationship of lightweight oil palm shell concrete (OPSC) was investigated. OPSC with PAN fibres was found to exhibit reduced strength deterioration upon exposure to elevated temperatures of 100 °C, 200 °C and 400 °C. The strain at peak stress and the compressive ductility of OPSC were also increased with the addition of PAN fibres. Despite the reduced workability,

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Kovács, I. "Structural performance of steel fibre reinforced concrete — Part II. Compressive behaviour and stress-strain relationship." International Review of Applied Sciences and Engineering 5, no. 1 (2014): 21–33. http://dx.doi.org/10.1556/irase.5.2014.1.3.

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Abstract The present paper of a series deals with the experimental characterisation of compressive strength and compressive behaviour (stress-strain relationship) of different structural concrete containing different volume of steel fibre reinforcement (0 V%, 0.5V%, 1.0V%, 75 kg/m3, 150 kg/m3) and different configuration of steel fibres (crimped, hooked-end). Compressive tests were carried out on standard cube (150 mm × 150 mm × 150 mm) and cylinder (Ø = 150 mm, l = 300 mm) specimens considering random fibre orientation. Since the fibre orientation may significantly affect the compressive beha

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40

Purslow, P. P., T. J. Wess, and D. W. Hukins. "Collagen orientation and molecular spacing during creep and stress-relaxation in soft connective tissues." Journal of Experimental Biology 201, no. 1 (1998): 135–42. http://dx.doi.org/10.1242/jeb.201.1.135.

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Collagen fibres form cross-helical, cross-ply or quasi-random feltworks in extensible connective tissues; strain-induced reorientation of these networks gives rise to the non-linear mechanical properties of connective tissue at finite strains. Such tissues are also generally viscoelastic (i.e. display time-dependent properties). The hypothesis that time-dependent reorientation of collagen fibres is responsible for the viscoelasticity of such tissues is examined here using time-resolved X-ray diffraction measurements during stress-relaxation and creep transients applied to rat skin and bovine i

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41

Auernhammer, Julia, Tom Keil, Binbin Lin, et al. "Mapping humidity-dependent mechanical properties of a single cellulose fibre." Cellulose 28, no. 13 (2021): 8313–32. http://dx.doi.org/10.1007/s10570-021-04058-4.

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AbstractModelling of single cellulose fibres is usually performed by assuming homogenous properties, such as strength and Young’s modulus, for the whole fibre. Additionally, the inhomogeneity in size and swelling behaviour along the fibre is often disregarded. For better numerical models, a more detailed characterisation of the fibre is required. Herein, we report a method based on atomic force microscopy to map these properties along the fibre. A fibre was mechanically characterised by static colloidal probe AFM measurements along the longitudinal direction of the fibre. Thus, the contact str

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Cadoni, Ezio, Matteo Dotta, and Daniele Forni. "Behaviour of UHPFRCs in compression under high stress-rates." EPJ Web of Conferences 183 (2018): 02005. http://dx.doi.org/10.1051/epjconf/201818302005.

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The paper presents the results obtained on cylindrical Ultra High Performance Fibre Reinforced Concrete specimens with diameter of 30mm and a height of 60mm under compression at high stress rate (1.7–2.3 TPa/s). Four different percentages of fibre reinforcement are considered (1, 2, 3, and 4% fibre content) and compared with the results of the matrix (UHPC). A slight reduction of the strength and fracture time with the introduction of fibres is observed. The experimental results are analysed and discussed with the intent to better understand the mechanical behaviour of UHPFRC materials in case

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Kolařík, Jan. "Composite Artificial Tendons with Hydrogel Matrix." Collection of Czechoslovak Chemical Communications 60, no. 11 (1995): 1995–2005. http://dx.doi.org/10.1135/cccc19951995.

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The brief review is concerned with synthetic model tendons consisting of water-swollen hydrogel matrix and poly(ethylene terephthalate) fibres. Texturized fibres were employed in tendon construction in order to imitate stress-strain and other mechanical properties of natural tendons. Stiffness, creep behaviour, strength, and elongation-at-break of model tendons are predetermined by those of incorporated fibre bundles. Thus, by varying the fibre volume fraction, it is possible to achieve mechanical properties required for various types of tendon prostheses.

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Le, Victoria P., Jeffrey K. Cheng, Jungsil Kim, et al. "Mechanical factors direct mouse aortic remodelling during early maturation." Journal of The Royal Society Interface 12, no. 104 (2015): 20141350. http://dx.doi.org/10.1098/rsif.2014.1350.

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Numerous diseases have been linked to genetic mutations that lead to reduced amounts or disorganization of arterial elastic fibres. Previous work has shown that mice with reduced amounts of elastin ( Eln+/− ) are able to live a normal lifespan through cardiovascular adaptations, including changes in haemodynamic stresses, arterial geometry and arterial wall mechanics. It is not known if the timeline and presence of these adaptations are consistent in other mouse models of elastic fibre disease, such as those caused by the absence of fibulin-5 expression ( Fbln5−/− ). Adult Fbln5−/− mice have d

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Spierts, I. L. Y., H. A. Asker, I. H. C. Voss, and J. W. M. Osse. "Local differences in myotendinous junctions in axial muscle fibres of carp (Cyprinus carpio L.)." Journal of Experimental Biology 199, no. 4 (1996): 825–33. http://dx.doi.org/10.1242/jeb.199.4.825.

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We studied the myotendinous junctions of anterior and posterior red and white axial muscle fibres of carp using stereology. In posterior axial muscle fibres of swimming fish, stress (load on the myotendinous junction) must be higher than in anterior fibres as posterior fibres have a longer phase of eccentric activity. As we expected the magnitude of the load on the junction to be reflected in its structure, we compared the interfacial ratio, the ratio between the area of the junctional sarcolemma and the cross-sectional fibre area, of these muscle fibres. This ratio differed significantly betw

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Wiemer, Niels, Alexander Wetzel, Maximilian Schleiting, et al. "Effect of Fibre Material and Fibre Roughness on the Pullout Behaviour of Metallic Micro Fibres Embedded in UHPC." Materials 13, no. 14 (2020): 3128. http://dx.doi.org/10.3390/ma13143128.

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The use of micro fibres in Ultra-High-Performance Concrete (UHPC) as reinforcement increases tensile strength and especially improves the post-cracking behaviour. Without using fibres, the dense structure of the concrete matrix results in a brittle failure upon loading. To counteract this behaviour by fibre reinforcement, an optimal bond between fibre and cementitious matrix is essential. For the composite properties not only the initial surfaces of the materials are important, but also the bonding characteristics at the interfacial transition zone (ITZ), which changes upon the joining of both

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Xu, Zhi Hong, Wen Yin Liang, and Yu Jing Liang. "Experimental Study of Steel Fibre Bridging Action on Crack Propagation in Fibre Reinforced Concrete." Key Engineering Materials 324-325 (November 2006): 1067–70. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.1067.

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In this paper the bridging action of steel fibres on the model I crack propagation has been studied experimentally for steel fibre reinforced concrete (FRC). From the experimental results three main conclusions are obtained. First, the bridging action increases with the number of the steel fibres across the crack surface and the stress intensity factor near the crack tip decreases thereby. Second, bridging action increases with the strength of the matrix because the matrix with higher strength can provide stronger interfacial bond with steel fibres. Third, the interfacial bonding gets damaged

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Sorzia, Andrea. "Modelling of Creep and Stress Relaxation Test of a Polypropylene Microfibre by Using Fraction-Exponential Kernel." Modelling and Simulation in Engineering 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/3823047.

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A tensile test until breakage and a creep and relaxation test on a polypropylene fibre are carried out and the resulting creep and stress relaxation curves are fit by a model adopting a fraction-exponential kernel in the viscoelastic operator. The models using fraction-exponential functions are simpler than the complex ones obtained from combination of dashpots and springs and, furthermore, are suitable for fitting experimental data with good approximation allowing, at the same time, obtaining inverse Laplace transform in closed form. Therefore, the viscoelastic response of polypropylene fibre

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Osorio, L., E. Trujillo, F. Lens, J. Ivens, I. Verpoest, and AW Van Vuure. "In-depth study of the microstructure of bamboo fibres and their relation to the mechanical properties." Journal of Reinforced Plastics and Composites 37, no. 17 (2018): 1099–113. http://dx.doi.org/10.1177/0731684418783055.

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The mechanical properties of bamboo technical fibre, from the species Guadua angustifolia, have been studied showing values of strength up to 800 MPa and E-modulus up to 43 GPa, proving their adequate tensile properties that make this natural fibre suitable as reinforcement in composite materials. To fully explore the good mechanical properties and to make an adequate use of this new reinforcement, it is indispensable to comprehensively understand the fibre behaviour as a function of the microstructure. Microscopic observations have provided us with an extensive knowledge of the complex micros

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Deshpande, Vikram S., Robert M. McMeeking, and Anthony G. Evans. "A model for the contractility of the cytoskeleton including the effects of stress-fibre formation and dissociation." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 463, no. 2079 (2007): 787–815. http://dx.doi.org/10.1098/rspa.2006.1793.

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A model for the contractility of cells is presented that accounts for the dynamic reorganization of the cytoskeleton. It is motivated by three key biochemical processes: (i) an activation signal that triggers actin polymerization and myosin phosphorylation, (ii) the tension-dependent assembly of the actin and myosin into stress fibres, and (iii) the cross-bridge cycling between the actin and the myosin filaments that generates the tension. Simple relations are proposed to model these coupled phenomena and a constitutive law developed for the activation and response of a single stress fibre. Th

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