scholarly journals Mechanical properties of waste silk fibre reinforced PLA bio composites manufactured through hand layup method

2021 ◽  
Vol 2027 (1) ◽  
pp. 012016
Author(s):  
V. Mohanavel ◽  
T Sathish ◽  
M. Ravichandran ◽  
K. Arul ◽  
Ram Subbiah
Keyword(s):  
Mechanical Properties ◽  
Silk Fibre

scholarly journals Mesoscale structure development reveals when a silkworm silk is spun

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Quan Wan ◽  
Mei Yang ◽  
Jiaqi Hu ◽  
Fang Lei ◽  
Yajun Shuai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hierarchical Structure ◽  
Ex Vivo ◽  
Silk Fibre ◽  
Structure Development ◽  
Sequence Of Events ◽  
Spinning Process ◽  
Consolidation Phase ◽  
Definition Of ◽  
Silkworm Silk

AbstractSilk fibre mechanical properties are attributed to the development of a multi-scale hierarchical structure during spinning. By careful ex vivo processing of a B. mori silkworm silk solution we arrest the spinning process, freezing-in mesoscale structures corresponding to three distinctive structure development stages; gelation, fibrilization and the consolidation phase identified in this work, a process highlighted by the emergence and extinction of ‘water pockets’. These transient water pockets are a manifestation of the interplay between protein dehydration, phase separation and nanofibril assembly, with their removal due to nanofibril coalescence during consolidation. We modeled and validated how post-draw improves mechanical properties and refines a silk’s hierarchical structure as a result of consolidation. These insights enable a better understanding of the sequence of events that occur during spinning, ultimately leading us to propose a robust definition of when a silkworm silk is actually ‘spun’.

Influence of Chopped Fibre Length on the Mechanical and Thermal Properties of Silk Fibre-Reinforced Poly(Butylene Succinate) Biocomposites

2005 ◽  
Vol 13 (5) ◽  
pp. 479-488 ◽  
Author(s):  
Sang Muk Lee ◽  
Seong Ok Han ◽  
Donghwan Cho ◽  
Won Ho Park ◽  
Seung Goo Lee
Keyword(s):  
Mechanical Properties ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Coefficient Of Thermal Expansion ◽  
Fibre Length ◽  
Present System ◽  
Silk Fibre ◽  
Mechanical And Thermal Properties ◽  
Butylene Succinate ◽  
Linear Coefficient

The influence of chopped fibre length on the mechanical and thermal properties of silk fibre ( Bombix mori) reinforced poly(butylene succinate) (PBS) biocomposites has been investigated in terms of tensile and flexural properties, thermal stability, thermal expansion, and dynamic mechanical properties. The chopped fibre lengths studied were 3.2 mm, 6.4 mm, 12.7 mm, and 25.4 mm. The results demonstrate that chopped silk fibres play an effective role in improving the mechanical properties of PBS in the present system. At a fixed fibre loading of 40 wt%, the tensile strength and modulus of the PBS control were improved by 69% and 228%, respectively, in comparison with those of the biocomposite reinforced with 25.4 mm silk fibres. The flexural strength and modulus of PBS were also greatly improved by 167% and 323%, respectively. The thermal properties of PBS resin increased when incorporating chopped silk fibres in the composite matrix. The biocomposites had much lower linear coefficient of thermal expansion (CTE) values and higher storage moduli than the PBS controls above the glass transition region, especially with reinforcing silk fibres of 25.4 mm long.

Synthesis and Characterization of Silk Fibre Reinforced Cepu Composites

2010 ◽  
Vol 123-125 ◽  
pp. 391-394 ◽  
Author(s):  
T.M. Mruthyunjaya Swamy ◽  
Manjula Koregala Sidde Gowda ◽  
Siddaramaiah ◽  
Joong Hee Lee
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Castor Oil ◽  
Glutaric Acid ◽  
Biological Fluids ◽  
Chain Extender ◽  
Synthesis And Characterization ◽  
Silk Fibre ◽  
Fibre Composites

Composites of silk fibre reinforced chain extended polyurethane (CEPU) was synthesized by the reaction of castor oil with different diisocyanates and glutaric acid as chain extender. The effect of incorporation of silk fibre into neat CEPU on the physico- mechanical properties and thermal behaviours (TGA and DMA) has been investigated. The incorporation of silk fibre into CEPUs resulted in an enhancement of tensile strength and Tg. The effects of biological fluids and salt solution on swelling behavior of CEPU biocomposites were reported. Key words: Castor oil, silk fibre, composites, polyurethane, DMA, TGA.

scholarly journals A Study on the Dynamic Mechanical Properties of Silk Fibre Composites

2011 ◽  
Vol 410 ◽  
pp. 106-109
Author(s):  
Mei Po Ho ◽  
Hao Wang ◽  
Chun Kit Ho ◽  
Kin Tak Lau
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Medical Engineering ◽  
Dynamic Mechanical Properties ◽  
Silk Fibre ◽  
Mechanical And Thermal Properties ◽  
Bone Implant ◽  
Dynamic Mechanical ◽  
Fibre Composites ◽  
Biodegradable Properties

Silk fibre has been popularly used for bio-medical engineering and surgically-operational applications because of its biocompatible and bio-resorbable properties for centuries. Using silk fibre as reinforcement for some bio-polymers to enhance the stiffness of scaffolding and bone implant plates has been developed. However, its dynamic mechanical properties with the biodegradable properties have not yet well understood. In this paper, the dynamic mechanical and thermal properties of degraded and non-degraded silk fibre reinforced Polylactic acid (PLA) composites are discussed.

scholarly journals Mechanical properties of Bombyx mori silkworm silk fibre and its corresponding silk fibroin filament: A comparative study

2019 ◽  
Vol 181 ◽  
pp. 108077 ◽  
Author(s):  
Shaoyong Chen ◽  
Mingyue Liu ◽  
Huiming Huang ◽  
Lan Cheng ◽  
Hong-Ping Zhao
Keyword(s):  
Mechanical Properties ◽  
Comparative Study ◽  
Bombyx Mori ◽  
Silk Fibroin ◽  
Silk Fibre ◽  
Silkworm Silk

scholarly journals Connecting caddisworm silk structure and mechanical properties: combined infrared spectroscopy and mechanical analysis

Open Biology ◽  
2016 ◽  
Vol 6 (6) ◽  
pp. 160067 ◽  
Author(s):  
Nicholas N. Ashton ◽  
Huaizhong Pan ◽  
Russell J. Stewart
Keyword(s):  
Mechanical Properties ◽  
Metal Ions ◽  
Metal Ion ◽  
Large Strain ◽  
Fibre Strength ◽  
Silk Fibre ◽  
Initial Stiffness ◽  
Stress Plateau ◽  
Transition Dipole ◽  
Initial Strength

The underwater silk of an aquatic casemaking caddisfly larvae ( Hesperophylax occidentalis) is viscoelastic, and displays distinct yield behaviour, large strain cycle hysteresis and near complete recovery of its initial strength and stiffness when unloaded. Yield followed by a stress plateau has been attributed to sequential rupture of serial Ca 2+ -cross-linked phosphoserine (pS) β-domains. Spontaneous recovery has been attributed to refolding of the Ca 2+ /pS domains powered by an elastic network. In this study, native Ca 2+ ions were exchanged with other metal ions, followed by combined mechanical and FTIR analysis to probe the contribution of pS/metal ion complexes to silk mechanical properties. After exchange of Ca 2+ with Na + , the fibres are soft elastomers and the infrared spectra are consistent with C v3 symmetry of the – groups. Multivalent metal ions decreased the – symmetry and the symmetric stretching modes ( v s ) split in a manner characteristic of ordered phosphate compounds, such as phosphate minerals and lamellar bilayers of phosphatidic acid lipids. Integrated intensities of the v s bands, indicative of the metal ion's effect on transition dipole moment of the P–O bonds, and thereby the strength of the phosphate metal complex, increased in the order: Na + < Mg 2+ < Sr 2+ < Ba 2+ < Ca 2+ < Eu 3+ < La 3+ < Zn 2+ < Fe 2+ . With a subset of the metal ion series, the initial stiffness and yield stress of metal ion-exchanged fibres increased in the same order: establishing the link between phosphate transition dipole moments and silk fibre strength.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

Sign in / Sign up

Export Citation Format

Share Document