Energy absorption processes in fibrous composites

Zee, R.H.; Hsieh, Cheng-Ta

doi:10.1016/s0921-5093(97)00735-1

Cited by 45 publications

(23 citation statements)

References 30 publications

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“…High strain rate impact events involve complex compressive, tensile, and shear stress states, multi-mode failure processes, elastic deformation, as well as kinetic energy transfer to the composite [1,2]. Interestingly, with FRPCs, energy dissipation in the polymer matrix alone can be responsible for 20-35% of the total energy dissipation [3], however, few studies have focused on improving high rate dissipative capabilities of matrixonly performance in ballistic environments [4]. Epoxy resins that have high stiffness and strength required for structural applications are heavily exploited in fiber reinforced composites, but they are notoriously brittle [5].…”

Section: Introductionmentioning

confidence: 99%

Overcoming the structural versus energy dissipation trade-off in highly crosslinked polymer networks: Ultrahigh strain rate response in polydicyclopentadiene

Knorr

Masser

Elder

et al. 2015

Composites Science and Technology

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a b s t r a c tBallistic performance, at effective strain rates of (10 4 -10 5 s À1 ), for polymeric dicyclopentadiene (pDCPD)was compared with two epoxy resin/diamine systems with comparable glass transition temperatures. The high rate response was characterized in terms of a projectile penetration kinetic energy, KE 50 , which describes the projectile kinetic energy at a velocity with a 50% probability of sample penetration. pDCPD showed superior penetration resistance, with a 300-400% improvement in ballistic energy dissipation, when compared with the structural epoxy resins. In addition, unlike typical highly crosslinked networks that become brittle at low temperatures, the improved pDCPD performance occurred over a very broad temperature range (À55 to 75°C), despite exhibiting a glass transition temperature characteristic of structural resins ($142°C). In addition to the high T g , pDCPD exhibited a room temperature glassy storage modulus of 1.7 GPa, offering the potential to circumvent the common structural versus energy dissipation trade-off encountered with conventional crosslinked polymers. Quasi-static measurements suggested that the performance of pDCPD is phenomenologically related to higher fracture toughness and lower yield stress relative to typical epoxies, while molecular dynamics simulations suggest the origin is the lack of strong non-covalent interactions and the facile formation of nanoscale voids to accommodate strain in pDCPD.Published by Elsevier Ltd.

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Section: Introductionmentioning

confidence: 99%

Overcoming the structural versus energy dissipation trade-off in highly crosslinked polymer networks: Ultrahigh strain rate response in polydicyclopentadiene

Knorr

Masser

Elder

et al. 2015

Composites Science and Technology

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“…They are useful as an alternative to more conventional statistical tools in exploring the prognostic information in a performance evaluation data set [42]. They are likely to be useful to expert analyst in their assessment and design of ballistic textiles in general [19,26,34]. However the proposed model does not take into account the variability of ballistic performance properties and material properties arising due to effect of different fabrics layers which need to be addressed with different set of test data and in particular to take address the issues of the composite layer as a whole [25].…”

Section: Resultsmentioning

confidence: 99%

Investigation and modeling on protective textiles using artificial neural networks for defense applications

Ramaiah

Chennaiah

Satyanarayanarao

2010

Materials Science and Engineering: B

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a b s t r a c tKevlar 29 is a class of Kevlar fiber used for protective applications primarily by the military and law enforcement agencies for bullet resistant vests, hence for these reasons military has found that armors reinforced with Kevlar 29 multilayer fabrics which offer 25-40% better fragmentation resistance and provide better fit with greater comfort. The objective of this study is to investigate and develop an artificial neural network model for analyzing the performance of ballistic fabrics made from Kevlar 29 single layer fabrics using their material properties as inputs. Data from fragment simulation projectile (FSP) ballistic penetration measurements at 244 m/s has been used to demonstrate the modeling aspects of artificial neural networks. The neural network models demonstrated in this paper is based on back propagation (BP) algorithm which is inbuilt in MATLAB 7.1 software and is used for studies in science, technology and engineering. In the present research, comparisons are also made between the measured values of samples selected for building the neural network model and network predicted results. The analysis of the results for network predicted and experimental samples used in this study showed similarity.

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“…Resultados mais completos podem ser obtidos com o uso do ensaio de impacto instrumentado e corpos de prova pré-trincados e, neste caso, os conceitos da mecânica da fratura podem ser aplicados nas análises (Williams;Rager, 2001 (Gowda et al, 1999), (Zee, 1998 Entre os componentes principais das fibras lignocelulósicas, a hemicelulose é a principal responsável pela absorção de umidade da fibra, ainda que a lignina e a celulose não cristalina tenham também sua importância (Das et al, 2000). O tratamento alcalino extrai ao menos parte da hemicelulose e, desta forma, seria esperado redução no nível de absorção de umidade da fibra.…”

Section: Resistência Ao Impactounclassified

Compósito de resina poliuretano derivada de óleo de mamona e fibras vegetais

Silva¹

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Neto e ao Toninho, ambos do GQATP-IQSC, pelo fornecimento da resina, por permitir a utilização dos equipamentos do seu laboratório e pelas indispensáveis sugestões na utilização da resina.Ao Prof. Dr. Elias Hage Jr. por permitir a utilização dos equipamentos de DMTA e de ensaios mecânicos e ao amigo Nelson pela ajuda na realização dos ensaios de DMTA. Ás indústrias LWARCEL -Celulose e papel Ltda e Diniz S/A -Fábrica devassouras e capachos, que doaram as fibras de sisal e coco, respectivamente. Aos amigos Neilor, Geraldo e Volnei do Departamento de EngenhariaMecânica pela amizade e grande ajuda no início da realização deste trabalho.Ao amigo Douglas de Brito e ao Prof. Dr. Sergio Campana do IQSC pela realização de experimentos de análises térmicas. À Sandra Patrícia pelas sugestões na realização do tratamento das fibras. Aos técnicos do Departamento de Engenharia de Materiais, Aeronáutica eAutomobilística, Tico, Silvano, João, Pedro e Alberto pela ajuda na realização do trabalho experimental.Às secretárias, Regina, Ana, Eliete e Lúcia pelos serviços prestados.Às bibliotecárias Eleninha e Elenise pelos serviços prestados.Aos amigos e companheiros de trabalho, Ricardo, Heloisa, Cassius, Marcelo, Falcão, Nei e Omar pela amizade e auxílio. xi ABSTRACTThe new paradigm in preserving the environment and the use of natural

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Energy absorption processes in fibrous composites

Cited by 45 publications

References 30 publications

Overcoming the structural versus energy dissipation trade-off in highly crosslinked polymer networks: Ultrahigh strain rate response in polydicyclopentadiene

Overcoming the structural versus energy dissipation trade-off in highly crosslinked polymer networks: Ultrahigh strain rate response in polydicyclopentadiene

Investigation and modeling on protective textiles using artificial neural networks for defense applications

Compósito de resina poliuretano derivada de óleo de mamona e fibras vegetais

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