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RISS 인기검색어
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- 저자 : Khubab Shaker (검색결과 5 건)
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Effect of Fabric Structure on the Performance of 3D Woven Pressure Sensor
Khubab Shaker,Muhammad Umair,Syed Talha Ali Hamdani,Yasir Nawab 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
The textile-based pressure sensors are an integral part of the wearable electronic textiles, that helps to measure thepressure/load applied to the sensor. These sensors are used predominantly for health and sports application, especially tomonitor the blood pressure, heart rate or performance of muscles during exercise. The work done in this research is about theinvestigation of the response of a 3D woven fabric-based pressure sensor by varying the yarn interlacement pattern in 3layered fabric. Four samples were produced using a 3D weaving technique, with two types of yarns i.e. polyester/cotton (59tex) and multifilament steel (55.5 tex). The weave design of face and back layer of the three-layered structure was kept 1/1plain (P), while the weave design of middle layer was changed to plain (P), matt (M), twill (T) or satin (S), resulting instructures PPP, PMP, PTP, and PSP respectively. Working of pressure sensor was evaluated in terms of resistance offered bystructure, both under static and dynamic loading. The dynamic load was applied by the compression and subsequentrelaxation, i.e. under incremental loading followed by decremental unloading. All the structures showed variation inresistance in response to applied load showing potential being used as a pressure sensor. The structures PPP, PMP, and PSPbehaved as a pressure sensor up to 500 grams while the efficient sensor was PTP (plain/twill/plain) with activity up to a loadof 5500 grams. A statistical model was developed for the structure PTP, correlating the resistance with the applied load. Thedeveloped sensors can also be produced inside the fabrics or can be embedded inside garments.
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Usman Ahmed,Asra Tariq,Yasir Nawab,Khubab Shaker,Zubair Khaliq,Muhammad Umair 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6
The conventional woven fabrics (plain, twill, satin, etc.) have yarn undulations, that may lead to the fibre breakageand loss of mechanical strength. This problem was resolved using unidirectional woven structures having straight yarns, butthey provide strength in one direction only. A possible solution is the use of biaxial fabric having yarns at ±45 o asreinforcement, but its fabrication cost is too high. The current study focussed on the development of a composite materialusing conventional fabrics having comparable properties with biaxial fabric composites. Three different reinforcements(plain, twill and unidirectional) were prepared using glass fibre. For composite fabrication, plies were cut, stacked at ±45 oand infused with unsaturated polyester resin to produce a composite equivalent to the biaxial composite. Similarly, thestitched composites were also fabricated by stitching the similar stack (using chain stitch class 101) before impregnating withresin. Laminated composites from biaxial fabric (both stitched and unstitched) were also produced for comparison. All thesecomposites were characterised for tensile and impact properties. The tensile strength of stitched unidirectional compositeswas higher as compared to the other woven and biaxial structures. Similarly, the impact strength was also higher for stitchedunidirectional composite. Hence, the ±45 o stacked unidirectional composite may be used as a potential replacement of biaxialcomposite.
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Optimization of Flame Retardancy & Mechanical Performance of Jute-glass/Epoxy Hybrid Composites
Muhammad Umair,Ayesha Shahbaz,Ahsan Ahmad,Sohaib Arif,Khubab Shaker,Madeha Jabbar,Yasir Nawab 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
One of the limiting factors of natural fiber composites is their lower flame retardancy (FR) and mechanicalstrength as compared to the glass and other synthetic fiber composites. In this research, FR and mechanical properties of thehybrid jute-glass/epoxy composites were optimized. In the first part, different percentages (1 %, 2 % & 3 %) of zirconiumphosphate (ZrP) particles were mixed in epoxy resin to optimize the flame retardancy and mechanical properties of jute/epoxy composites. 3 % ZrP loaded composite showed improved FR and mechanical (tensile and impact) properties followedby 2 % and 1 % respectively. In the second part, optimized percentage of ZrP particles (3 %) was used to fabricate two (02)jute-glass hybrid epoxy composites, and their mechanical (tensile, flexural and impact) and FR properties were evaluated. Hybrid (H1) samples showed better mechanical and FR properties due to presence of glass layer on the outer side ofcomposite with 3 % ZrP particles loading.
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Aakash Ali,Muhammad Ali Nasir,Muhammad Yasir Khalid,Saad Nauman,Khubab Shaker,Shahab Khushnood,Khurram Altaf,Muhammad Zeeshan,Azhar Hussain 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.9
Natural fiber composites have great potential for reducing the product cost, lowering weight and enhancing renewability. Functionality and performance of natural fibers can be enhanced many folds using them together with synthetic fibers. Hybridization of carbon and low-cost natural jute fiber offers a sustainable hybrid composite having high modulus and mechanical strength. This study investigates flexural behavior of carbon/jute epoxy composites experimentally and numerically. Also, impact response is characterized through drop weight method. Study concludes that flexural strength decreases with increase in jute percentage. Simulation of flexural behavior diverges more than 10 % from experimental results. This anomaly is due to waviness of fiber resulting in heterogeneous property distribution in composites. Further, the fracto-graphic study revealed modes of failure. The drop weight impact tests reveal increased damage area with increase in jute percentage.
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Zamurrad Arshad,Muhammad Ali Nasir,Yasir Baig,Muhammad Zeeshan,Rizwan Ahmed Malik,Khubab Shaker,Azhar Hussain,M. Latif,Maryam Sattar,Hussein Alrobei 한국고분자학회 2020 폴리머 Vol.44 No.5
This work focuses on the synthesis of a novel hybrid composite, fabricated by utilizing jute and carbon fibers reinforced epoxy composites through hand layup technique to replace pure carbon-epoxy fiber composites. The mechanical properties were evaluated by drop weight impact and tension-tension fatigue tests. The tension-tension fatigue test was conducted to monitor the dynamic stiffness and fatigue life degradation of hybrid composite materials by varying the layers of jute fiber. The maximum peak load during the impact test was observed as 1081.7 N in case of carbon/jute/ carbon/jute/carbon (CJCJC) stacking sequence composite materials. Finally, the surface morphology of hybrid composite materials was studied with scanning electron microscopy (SEM) after mechanical tests to check the delamination, fiber pull-out and matrix cracks. It can be concluded from the obtained mechanical results that the newly developed composite with 15% jute/carbon-epoxy hybrid materials has the potential to swap carbon-epoxy composite without much loss of fatigue life along with relatively enhanced ductility as well as impact strength.
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