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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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Influence of thickness and projectile shape on penetration resistance of the compliant composite

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Defence Technology（防务技术） 2021年第1期17卷 245-256页

作者： vishwas mahesh Sharnappa Joladarashi Satyabodh M.Kulkarni Department of Mechanical Engineering National Institute of Technology Karnataka SurathkalMangalore 575025India Department of Industrial Engineering and Management Siddaganga Institute of TechnologyTumakuru 572103KarnatakaIndia

The present study deals with development of conceptual proof for jute rubber based flexible composite block to completely arrest the projectile impacting the target at high velocity impact of 400 m/s through numerical simulation approach using finite element(FE)*** proposed flexible composite blocks of repeating jute/rubber/jute(JRJ)units are modelled with varying thickness from 30 mm to 120 mm in increments of 30 mm and impacted by flat(F),ogival(O)and hemispherical(HS)shaped *** the considered projectiles are impacted with proposed flexible composite blocks of different thicknesses and the penetration behaviour of the projectile in each case is *** penetration depth of the projectile in case of partially penetrated cases are considered and the effect of thickness and projectile shape on percentage of penetration depth is statistically analyzed using Taguchi’s design of experiments(DOE).Results reveal that the though proposed flexible composite block with thickness of 90 mm is just sufficient to arrest the complete penetration of the projectile,considering the safety issues,it is recommended to use the flexible composite with thickness of 120 *** nature of damage caused by the projectile in the flexible composite is also *** studies show that thickness of the block plays a prominent role in determining the damage resistance of the flexible composite.

关键词： Flexible composite blocks Jute Rubber High velocity Projectile shapes Thickness Damage resistance Penetration depth

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A comprehensive review on material selection for polymer matrix composites subjected to impact load

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Defence Technology（防务技术） 2021年第1期17卷 257-277页

作者： vishwas mahesh Sharnappa Joladarashi Satyabodh M.Kulkarni Department of Mechanical Engineering National Institute of Technology Karnataka SurathkalMangalore575025India

Polymer matrix composites(PMC)are extensively been used in many engineering *** natural fibers have emerged as potential replacements to synthetic fibers as reinforcing materials composites owing to their fairly better mechanical properties,low cost,environment friendliness and *** of appropriate constituents of composites for a particular application is a tedious task for a designer/*** loading has emerged as the serious threat for the composites used in structural or secondary structural application and demands the usage of appropriate fiber and matrix combination to enhance the energy absorption and mitigate the *** objective of the present review is to explore the composite with various fiber and matrix combination used for impact applications,identify the gap in the literature and suggest the potential naturally available fiber and matrix combination of composites for future work in the field of impact *** novelty of the present study lies in exploring the combination of naturally available fiber and matrix combination which can help in better energy absorption and mitigate the failure when subjected to impact *** addition,the application of multi attributes decision making(MADM)tools is demonstrated for selection of fiber and matrix materials which can serve as a benchmark study for the researchers in future.

关键词： Polymer matrix composites Natural fibers Green composite Impact characterization Flexible composite MADM Approach

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Damage mechanics and energy absorption capabilities of natural fiber reinforced elastomeric based bio composite for sacrificial structural applications

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Defence Technology（防务技术） 2021年第1期17卷 161-176页

作者： vishwas mahesh Sharnappa Joladarashi Satyabodh M.Kulkarni Department of Mechanical Engineering National Institute of Technology Karnataka SurathkalMangalore575025India

The present study deals with the experimental,finite element(FE)and analytical assessment of low ballistic impact response of proposed flexible‘green’composite make use of naturally available jute and rubber as the constituents of the composite with stacking sequences namely jute/rubber/jute(JRJ),jute/rubber/rubber/jute(JRRJ)and jute/rubber/jute/rubber/jute(JRJRJ).Ballistic impact tests were carried out by firing a conical projectile using a gas gun apparatus at lower range of ballistic impact *** ballistic impact response of the proposed flexible composites are assesses based on energy absorption and damage *** revealed that inclusion of natural rubber aids in better energy absorption and mitigating the failure of the proposed *** the three different stacking sequences of flexible composites considered,JRJRJ provides better ballistic performance compared to its *** damage study reveals that the main mechanism of failure involved in flexible composites is matrix tearing as opposed to matrix cracking in stiff composites indicating that the proposed flexible composites are free from catastrophic *** obtained from experimental,FE and analytical approach pertaining to energy absorption and damage mechanism agree well with each *** proposed flexible composites due to their exhibited energy absorption capabilities and damage mechanism are best suited as claddings for structural application subjected to impact with an aim of protecting the main structural component from being failed catastrophically.

关键词： Flexible composite Ballistic impact Energy absorbed Rubber Damage mechanism

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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 2022年第3期

作者： vishwas mahesh Dineshkumar Harursampath Vinyas mahesh

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Damage mechanics and energy absorption capabilities of natural fiber reinforced elastomeric based bio composite for sacrificial structural applications

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Defence Technology 2021年第1期

作者： vishwas mahesh Sharnappa JOLADARASHI Satyabodh M. KULKARNI

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Influence of thickness and projectile shape on penetration resistance of the compliant composite

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Defence Technology 2021年第1期

作者： vishwas mahesh Sharnappa Joladarashi Satyabodh M.Kulkarni

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A comprehensive review on material selection for polymer matrix composites subjected to impact load

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Defence Technology 2021年第1期

作者： vishwas mahesh Sharnappa JOLADARASHI Satyabodh M. KULKARNI

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Building Resilience Through Disaster Waste Management——UN Environment's Experiences and Approaches

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工程科学与技术 2018年第3期50卷 15-23页

作者： PRADHAN mahesh XU Qing International Environmental Technology Centre United Nations Environment Programme Sichuan Academy of Environmental Sciences

Integrating disaster waste issue is a critical component of making humanitarian action fit for the future,anticipating global risks and challenges such as increased vulnerability due to climate change and environmental *** requires a fundamental shift towards a model that not only strengthens the response to crises but also learns and adapts in order to anticipate and act before such waste *** article conducted analyses on the characteristics of disasters in the past two *** confound disaster waste management,including the timing and magnitude of each disaster,and the amounts and types of waste that will be *** these reasons alone,disaster waste management must be an integral part of development planning and *** 10 years since the 2008 Wenchuan earthquake,this article highlights that disaster waste management is not only debris clearance or waste management following a disaster,but also includes prevention and pre-disaster preparedness aspects in terms of enhancing resilience of local ***"mainstreaming,"ensures that disaster waste management(DWM)will be treated as a priority issue,on an ongoing *** on UN Environment's experiences and approaches,this paper emphasises that preparedness is the key,and that priority should be accorded to integrating disaster contingency planning in national and city level waste management strategies as well as mainstreaming waste management issues within broader disaster preparedness and response plans and *** is envisaged that the issues presented and the gaps identified in this paper will provide a basis for future comprehensive and cohesive research on disaster waste *** turn,this research can lead to better preparedness and response on disaster waste management.

关键词： disaster waste disaster risk reduction waste management Sendai Framework

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Hyaluronic acid as a rescue therapy for trinitrobenzene sulfonica cid-induced colitis through Cox-2 and PGE_2 in a Toll-like receptor 4-dependent way

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第9期12卷 712-719页

作者： mahesh MAHASETH Department of Gastroenterology West China Hospital of Sichuan University

We hypothesized whether systemic administration of high-molecular-weight hyaluronic acid(HMW HA) could rescue trinitrobenzene sulfonic acid(TNBS)-induced colitis through Toll-like receptor 4(TLR4) signal.C3H/HeN mice and C3H/HeJ mice were *** were divided into four groups:control,50% ethanol treatment group,TNBS treatment group,and TNBS plus HA treatment *** weight changes,clinical scores,macroscopic scores,and histological scores were *** 2(Cox-2) and prostaglandin E 2(PGE 2) expressions were measured both in colons and peritoneal macrophages from these *** was a rescue therapy for the colitis induced by TNBS only in C3H/HeN *** clinical score,macroscopic score,and histological score were much lower in C3H/HeN mice receiving TNBS plus HA ***-2 and PGE 2 expressions only increased in C3H/HeN *** Cox-2 expressing cells were *** can also promote the production of Cox-2 and PGE 2 in peritoneal macrophages from C3H/HeN *** data demonstrated that HMW HA can rescue TNBS-induced colitis through inducing Cox-2 and PGE 2 expressions in a TLR4-dependent *** may be the effector cells of HMW HA.

关键词： Trinitrobenzene sulfonic acid(TNBS) colitis Therapy Hyaluronic acid Toll-like receptor

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