Browsing by Author "Jamshaid, Hafsa"
Now showing 1 - 5 of 5
Results Per Page
Sort Options
- ItemAcoustic, Mechanical and Thermal Properties of Green Composites Reinforced with Natural Fibers Waste(MDPI, 2020-03) Hassan, Tufail; Jamshaid, Hafsa; Mishra, Rajesh; Khan, Muhammad Qamar; Petrů, Michal; Novák, Jan; Chotěborský, Rostislav; Hromasová, MonikaThe use of acoustic panels is one of the most important methods for sound insulation in buildings. Moreover, it has become increasingly important to use green/natural origin materials in this area to reduce environmental impact. This study focuses on the investigation of acoustic, mechanical and thermal properties of natural fiber waste reinforced green epoxy composites. Three different types of fiber wastes were used, e.g., cotton, coconut and sugarcane with epoxy as the resin. Different fiber volume fractions, i.e., 10%, 15% and 20% for each fiber were used with a composite thickness of 3 mm. The sound absorption coefficient, impact strength, flexural strength, thermal conductivity, diffusivity, coefficient of thermal expansion and thermogravimetric properties of all samples were investigated. It has been found that by increasing the fiber content, the sound absorption coefficient also increases. The coconut fiber-based composites show a higher sound absorption coefficient than in the other fiber-reinforced composites. The impact and flexural strength of the cotton fiber-reinforced composite samples are higher than in other samples. The coefficient of thermal expansion of the cotton fiber-based composite is also higher than the other composites. Thermogravimetric analysis revealed that all the natural fiber-reinforced composites can sustain till 300 degrees C with a minor weight loss. The natural fiber-based composites can be used in building interiors, automotive body parts and household furniture. Such composite development is an ecofriendly approach to the acoustic world.
- ItemBasalt hybrid woven textile materials for advanced thermal applications(NATL INST SCIENCE COMMUNICATION-NISCAIR, DR K S KRISHNAN MARG, PUSA CAMPUS, NEW DELHI 110 012, INDIA, 2019-03) Jamshaid, Hafsa; Mishra, Rajesh; Militký, Jiří; Hussain, SajidThe thermal properties of hybrid basalt-polypropylene (B/PP), basalt-polyester (B/PET) and basalt-jute (B/J) as well as non-hybrid structures have been studied. The fabric structures have been developed as plain weave (PW) for B/PP, B/PET & B/J; matt weave (MW) for B/PP, B/PET & B/J; and 1/3 twill weave (TW) for basalt-PP, basalt-PET, and basalt-Jute along with the non-hybrid fabrics. The thermal properties of the fabrics, such as thermal conductivity and thermal resistance are studied along with the physiological behavior. Thermal properties are measured by Alambeta and TCi. Correlation between theoretical and experimental measurement of thermal conductivity are also studied. Air permeability is tested by air permeability tester. Based on the results, the influence of fabric structure on specific thermal insulation parameters are analyzed. The findings show that there is a significant impact on thermal properties of basalt hybrid woven structures by geometrical parameters of weave. Structure and fibre type have strong influence on thermal properties. Twill weave structures show higher air permeability and thermal resistance in all combinations.
- ItemCharacteristics of Woven Basalt and Hybrid Structures as Composite Reinforcement(TEXTILE BIOENGINEERING & INFORMATICS SOCIETY LTD, TBIS 2010 SECRETARIAT MN104, HONG KONG POLYTECHNIC UNIV, HONG KONG SAR, 0000, PEOPLES R CHINA, 2018) Jamshaid, Hafsa; Mishra, Rajesh; Militký, JiříIn this study, experimental investigations are carried out to check the thermal and mechanical behavior of woven Basalt/PET and Basalt/PP fiber hybrid woven fabric epoxy composite laminates. Fabricated composite samples are subjected to mechanical and thermal characterization. Results are discussed in terms of fiber effect, weave geometry and the resin effect. The results reveal that the hybridization of basalt in different weaves leads to significant improvement in the mechanical properties of composites. The modulus is significantly increased in composites due to interfacial bonds between fibers and resin. Thermal behavior of fiber and composite was observed by Thermal Gravimetric Analysis. Thermal properties are also affected by hybridization. Thermal conductivity is strongly affected by resin properties. Fractography studies of the damaged surface are also demonstrated.
- ItemHybrid woven structures(Technická Univerzita v Liberci, ) Jamshaid, HafsaTato disertační práce poskytuje podrobnější informace o vlastnostech čedičových vláken vedle běžně používaných vláken, a to pro návrh a vývoj hybridních tkaných textilií určených pro výrobu kompozitních materiálů, zejména betonu vyztuženého textilií (TRC). Zkoumány jsou různé kombinace čedičové hybridní tkaniny s ohledem na mechanické, tepelné, akustické, elektrické a jiné vlastnosti, přičemž vliv hybridizace a struktury tkaných textilií je studován detailněji. Mechanické vlastnosti jsou predikovány s použitím a strukturální modely korelovány s výsledky získanými z provedených experimentů. Čedičová vlákna jsou velmi perspektivním materiálem díky jejich ohnivzdornosti spojené s lávovým původem, vynikajícím mechanickým vlastnostem a relativně nízké ceně. Na druhou stranu, tato vlákna doposud nebyla podrobena rozsáhlejšímu průzkumu, protože je možno je považovat za relativně nový typ vlákna. V technických článcích je možno nalézt jen omezené množství údajů o jejich chování po zpracování, jež je spojeno se stárnutím materiálu. Disertační práce prozkoumává možnosti využití čedičových vláken v kombinaci s jinými typy přízí a následně také vliv hybridní tkané struktury na nosnost kompozitu a dobu jeho životnosti. V této studii je vyšetřeno nosné chování TRC kompozitu (kompozitní systém tvořený jemnozrnnou betonovou matricí a výztuží složenou z vysoce funkčních vláken zpracovaných do plošné textilie) při jednoosém namáhání tahem. Průzkum je zaměřen na výztužnou schopnost hybridní tkané struktury. Při začleňování textilní struktury do betonu je zřejmé, že veškeré příze nejsou impregnovány cementovou matricí kompletně, což vede k heterogenitě systému beton - příze přispívajícímu ke komplexní nosnosti a defektnímu chování TRC kompozitu. Hlavním cílem této práce je tedy průzkum hybridizačních efektů na nosné chování TRC kompozitu.
- ItemINFLUENCE OF ANTISTATIC POLYESTER FIBERS ON THE PROPERTIES OF COTTON AND POLYESTER SINGLE JERSEY KNITTED FABRICS(Technical University of Liberec, ) Asfand, Norina; Basra, Sikander Abbas; Daukantienė, Virginija; Jamshaid, Hafsa; Ali, Zulfiqar; Technická univerzita v LiberciIn this research, the influence of the antistatic polyester fibers containing carbon black on the comfort properties of 100% and blended cotton as well as on 100% and blended polyester single jersey knitted fabrics was evaluated. The research results revealed that the behavior of the investigated knitted fabrics was dependent on their structure and mechanical characteristics. The electrical resistance of knitted fabrics decreased significantly due to the use of 4% antistatic polyester fibers. The electrical resistance of the pure and blended cotton knitted fabric was lower than that of the pure and blended polyester knitted fabrics. Antistatic polyester fibers positively influenced the air permeability of the polyester knitted fabric. The air permeability of 100% and blended cotton fabrics was approximately 3.5 times compared to both 100% and blended polyester fabrics, respectively. The carbon black polyester fibers influenced the decrease in thermal resistance, the increase in vapor permeability, and the minor increase in vapor resistance of both cotton and polyester knitted fabrics. Thermal resistance was lower, water vapor resistance was significantly higher, and relative water vapor permeability was slightly lower for the cotton and cotton/antistatic polyester knitted fabrics than for the polyester and polyester / antistatic polyester knitted fabrics, respectively. Therefore, the research results revealed that the presence of 4% antistatic polyester fibers in cotton and polyester knitted fabrics positively influenced their antistatic behavior and improved or almost did not alter their comfort properties.