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An experimental study on ballistic impact response of jute reinforced polyethylene glycol and nano silica based shear thickening fluid composite

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Defence Technology（防务技术） 2022年第3期18卷 401-409页

作者： Vishwas mahesh Dineshkumar Harursampath vinyas mahesh NMCAD Lab Department of Aerospace EngineeringIndian Institute of Science(IISc)Bangalore560012KarnatakaIndia Department of Industrial Engineering and Management Siddaganga Institute of Technology KarnatakaTumakuru572102India Department of Mechanical Engineering National Institute of Technology SilcharAssam788010India

The present study aims at assessing the ballistic impact behaviour of jute reinforced polyethylene glycol(PEG)and nano silica based shear thickening fluid(STF).Preparation of STF is achieved by dispersing the nano silica particles at different weight percentage loadings of 10%,20%,30%and 40%in PEG and the effect of various weight percentages loading of nano silica particles on ballistic performance of the proposed composites is studied *** studies of the prepared STF’s showed that at all nanosilica loading shear thickening occurred and also the shear thickening was highest at higher loading of nano silica at lower rate of *** study reveals that the ballistic performance of the jute fabric is enhanced with impregnation of *** ballistic results indicate that energy absorption of the proposed composites is enhanced with increased loading of nano silica particles and at the same time,the effect of STF was *** energy absorption(SEA)of the neat fabric and the proposed composites was made use of for the purpose of comparing the energy absorption *** is found that the SEA of proposed composites with 10%nano silica loading is lesser than the neat fabric both in case of 3 layers and 6 *** was also found that proposed composite with 40%nano silica loading exhibits highest SEA compared to neat fabric and its counterparts with its SEA being 3.21 and 3.76 times highest compared to three and six layers of neat fabrics respectively.

关键词： Ballistic impact Shear thickening fluid Nano silica Jute

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On the application of additive manufacturing methods for auxetic structures: a review

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Advances in Manufacturing 2021年第3期9卷 342-368页

作者： Athul Joseph vinyas mahesh Dineshkumar Harursampath Nonlinear Multifunctional Composites Analysis and Design(NMCAD)Laboratory Department of Aerospace EngineeringIndian Institute of ScienceBangalore560012India Department of Mechanical Engineering National Institute of TechnologySilcharAssam788010India

Auxetic structures are a special class of structural components that exhibit a negative Poisson’s ratio(NPR)because of their constituent materials,internal microstructure,or structural *** realize such structures,specialized manufacturing processes are required to achieve a dimensional accuracy,reduction of material wastage,and a quicker ***,additive manufacturing(AM)techniques play a pivotal role in this *** is a layer-wise manufacturing process and builds the structure as per the designed geometry with appreciable precision and ***,it is extremely beneficial to fabricate auxetic structures using AM,which is otherwise a tedious and expensive *** this study,a detailed discussion of the various AM techniques used in the fabrication of auxetic structures is *** advancements and advantages put forward by the AM domain have offered a plethora of opportunities for the fabrication and development of unconventional ***,the authors have attempted to provide a meaningful encapsulation and a detailed discussion of the most recent of such advancements pertaining to auxetic *** article opens with a brief history of the growth of auxetic materials and later auxetic ***,discussions centering on the different AM techniques employed for the realization of auxetic structures are *** basic principle,advantages,and disadvantages of these processes are discussed to provide an in-depth understanding of the current level of ***,the performance of some of the prominent auxetic structures realized through these methods is discussed to compare their benefits and *** addition,the influences of geometric and process parameters on such structures are evaluated through a comprehensive review to assess their feasibility for the later-mentioned ***,valuable insights into the applications,limitations,and prospects of AM for auxetic structures

关键词： Auxetic Additive manufacturing(AM) Negative Poisson’s ratio(NPR) Mechanical performance Unit-cell structure

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An experimental study on ballistic impact response of jute reinforced polyethylene glycol and nano silica based shear thickening fl uid composite

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Defence technology 2022年第3期

作者： Vishwas mahesh Dineshkumar Harursampath vinyas mahesh

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A higher order coupled frequency characteristics study of smart magneto-electro-elastic composite plates with cut-outs using finite element methods

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Defence Technology（防务技术） 2021年第1期17卷 100-118页

作者： M.vinyas D.Harursampath T.Nguyen Thoi Nonlinear Multifunctional Composites Analysis and Design(NMCAD)Laboratory Department of Aerospace EngineeringIndian Institute of ScienceBangalore560012India Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

This article deals with investigating the effect of cut-outs on the natural frequencies of magneto-electroelastic(MEE)plates incorporating finite element methods based on higher order shear deformation theory(HSDT).In order to consider the influence of cut-out,the energy of the cut-out domain is subtracted from the total energy of the entire *** governing equations of motions are derived through incorporating Hamilton’s principle and the solution is obtained using condensation *** proposed numerical formulation is verified with the results of previously published literature as well as the numerical *** addition,this research focuses on evaluating the effect of geometrical skewness and boundary conditions on the frequency *** influence of cut-outs on the degree of coupling between magnetic,electric and elastic fields is also investigated.

关键词： Cut-out Magneto-electro-elastic Natural frequency Higher order shear deformation Coupling

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Influence of active constrained layer damping on the coupled vibration response of functionally graded magneto-electro-elastic plates with skewed edges

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Defence Technology（防务技术） 2020年第5期16卷 1019-1038页

作者： M.vinyas D.Harursampath T.Nguyen-Thoi Nonlinear Multifunctional Composites Analysis and Design(NMCAD)Laboratory Department of Aerospace EngineeringIndian Institute of ScienceBangalore560012India Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

This article makes the first attempt in assessing the influence of active constrained layer damping(ACLD)treatment towards precise control of frequency responses of functionally graded skew-magneto-electroelastic(FGSMEE)plates by employing finite element *** materials are functionally graded across the thickness of the plate in terms of modest power-law *** principal equations of motion of FGSMEE are derived via Hamilton’s principle and solved using condensation *** effect of ACLD patches are modelled by following the complex modulus approach(CMA).Additionally,distinctive emphasis is laid to evaluate the influence of geometrical skewness on the attenuation capabilities of the *** accuracy of the current analysis is corroborated with comparison of previous researches of similar ***,a complete parametric study is directed to understand the combined impacts of various factors like coupling fields,patch location,fiber orientation of piezoelectric patch in association with skew angle and power-law index.

关键词： Vibration control Functionally graded MEE plates Skew angle Active constrained layer damping(ACLD) patches

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On vibration analysis of functionally graded carbon nanotube reinforced magneto-electro-elastic plates with different electro-magnetic conditions using higher order finite element methods

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Defence Technology（防务技术） 2021年第1期17卷 287-303页

作者： M.vinyas D.Harursampath S.C.Kattimani Nonlinear Multifunctional Composites Analysis and Design(NMCAD)Laboratory Department of Aerospace EngineeringIndian Institute of ScienceBangalore560012India Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkal575025India

This article deals with evaluating the frequency response of functionally graded carbon nanotube reinforced magneto-electro-elastic(FG-CNTMEE)plates subjected to open and closed electro-magnetic circuit *** this regard finite element formulation has been *** plate kinematics adjudged via higher order shear deformation theory(HSDT)is considered for *** equations of motion are obtained with the help of Hamilton’s principle and solved using condensation *** is found that the convergence and accuracy of the present FE formulation is very good to address the vibration problem of FG-CNTMEE *** the first time,frequency response analysis of FG-CNTMEE plates considering the effect of various circuit conditions associated with parameters such as CNT distributions,volume fraction,skew angle,aspect ratio,length-to-thickness ratio and coupling fields has been carried *** results of this article can serve as benchmark for future development and analysis of smart structures.

关键词： Carbon nanotube Magneto-electro-elastic Higher order shear deformation theory Coupled frequency Electro-magnetic conditions

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Infl uence of active constrained layer damping on the coupled vibration response of functionally graded magneto-electro-elastic plates with skewed edges

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Defence technology 2020年第5期

作者： M. vinyas D. Harursampath T. Nguyen-Thoi

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On vibration analysis of functionally graded carbon nanotube reinforced magneto-electro-elastic plates with diff erent electro-magnetic conditions using higher order fi nite element methods

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Defence technology 2021年第1期

作者： M.vinyas D.Harursampath S.C.Kattimani

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A higher order coupled frequency characteristics study of smart magneto-electro-elastic composite plates with cut-outs using fi nite element methods

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Defence technology 2021年第1期

作者： M.vinyas D.Harursampath T.Nguyen Thoi

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