Browsing by Author "Jayavardhan, M.L."

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Development of glass microballoon/HDPE syntactic foams by compression molding
(Elsevier Ltd, 2017) Jayavardhan, M.L.; Bharath Kumar, B.R.; Doddamani, M.; Singh, A.K.; Zeltmann, S.E.; Gupta, N.
Thermoplastic resins are widely used in consumer products and industrial components. There is a significant interest in weight reduction of many of those components. Although glass hollow particle filled lightweight syntactic foams with thermoset matrices have been studied in detail, studies on thermoplastic syntactic foams are scarce. The present study is focused on developing a compression molding based processing method for glass microballoon/high density polyethylene (GMB/HDPE) syntactic foams and studying their mechanical properties to develop structure-property correlations. Blending of GMB in HDPE is carried out using a Brabender mixer with processing parameters optimized for minimal filler breakage. Flexural and tensile test specimens are compression molded with 20, 40 and 60 vol% of GMB. Particle fracture increases with increasing GMB content due to increased particle to particle interaction during processing. Additionally, increasing wall thickness makes GMBs stronger and results in reduced particle fracture. Flexural modulus increases while strength decreases with increasing filler content. Tensile strength decreases with increasing filler content, while tensile modulus is relatively unchanged. GMB volume fraction has a more prominent effect than the wall thickness on the mechanical properties of syntactic foams. Specific moduli of GMB/HDPE foams are superior while specific strength is comparable to neat HDPE. © 2017 Elsevier Ltd
Quasi-static compressive response of compression molded glass microballoon/HDPE syntactic foam
(Elsevier Ltd, 2018) Jayavardhan, M.L.; Doddamani, M.
Quasi-static compressive behavior of different density glass microballoon (GMB) reinforced high density polyethylene (HDPE) syntactic foams are investigated in the present work. Reducing the weight of thermoplastic components has been always a high priority in transportation, aerospace, consumer products and underwater vehicle structures. Despite continued interest in developing lightweight thermoplastic syntactic foams, they have not been studied extensively for quasi-static response with focus on wall thickness and volume fraction variations. Compression molded GMB/HDPE sheets are subjected to 0.001, 0.01 and 0.1 s?1 strain rates. Compressive modulus of foams is higher compared to neat HDPE. Increasing strain rates and decreasing filler content increases yield strength for all the foams investigated compared to neat HDPE. Yield strain and energy absorption of GMB/HDPE foams increases with an increasing strain rate and wall thickness. Specific modulus and strength of GMB/HDPE foams are superior and are comparable to neat HDPE. GMB/HDPE foam achieved high stiffness to weight ratio making them suitable for wide variety of applications. Theoretical model based on differential scheme predicts a good estimate of elastic modulus for all the type of GMB/HDPE foams. Finally, property map is exhibited to present comparative studies with existing literature. © 2018 Elsevier Ltd
Tensile behavior of compression molded glass microballoon/HDPE syntactic foams
(2016) Jayavardhan, M.L.; Bharath, Kumar, B.R.; Doddamani, M.; Zeltmann, S.E.; Gupta, N.
Tensile behavior of glass microballoon (GMB) reinforced high density polyethylene (HDPE) matrix syntactic foams is investigated in the present study. GMB's having true particle density 350 kg/m3 are varied in 0, 20, 40 and 60 by vol. % in HDPE matrix using brabender and subsequently compression molded to form the syntactic foam sheets. Experimental results show that the modulus increases while strength decreases with increase in microballoon content. Syntactic foams present lower fracture strain as compared to neat HDPE. For designing syntactic foam microstructures with desired properties theoretical model can be effectively utilized.
Tensile behavior of compression molded glass microballoon/HDPE syntactic foams
(DEStech Publications Inc. info@destechpub.com, 2016) Jayavardhan, M.L.; Bharath Kumar, B.R.; Doddamani, M.; Zeltmann, S.E.; Gupta, N.
Tensile behavior of glass microballoon (GMB) reinforced high density polyethylene (HDPE) matrix syntactic foams is investigated in the present study. GMB's having true particle density 350 kg/m3 are varied in 0, 20, 40 and 60 by vol. % in HDPE matrix using brabender and subsequently compression molded to form the syntactic foam sheets. Experimental results show that the modulus increases while strength decreases with increase in microballoon content. Syntactic foams present lower fracture strain as compared to neat HDPE. For designing syntactic foam microstructures with desired properties theoretical model can be effectively utilized.