Performance of long fiber reinforced thermoplastics subjected to transverse intermediate velocity blunt object impact

Bartus, S. D.; Vaidya, Uday

doi:10.1016/j.compstruct.2004.07.023

Cited by 68 publications

(29 citation statements)

References 17 publications

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“…3 The fibre aspect ratio is important because the fibre length must exceed a critical fibre length , c for loading the fibre to its maximum strength. The maximum stress on the fibre s max is given by the following equation 3,4 ' c d~s max 2t i (1) where t i is the shear strength of the fibre/matrix interface (assuming that the interface strength is greater than the matrix yield stress), d is the diameter of the glass fibre and s max is the fracture strength of the fibre. Processing of the LFT is generally done by extrusioncompression moulding which results in a considerable amount of preferential fibre orientation.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional microstructure based modelling of Young's modulus of long fibre thermoplastic composite

Goel

Chawla

Vaidya

et al. 2008

Materials Science and Technology

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The dependence of physical and mechanical properties on microstructure is well known. Various numerical and analytical methods are routinely employed to predict the properties of multiphase materials but these models make certain simplifying assumptions about the microstructure of the material, such as homogeneity, that are not accurate. In the present work, a microstructure based finite element code called object oriented finite element method (OOF) has been used to investigate the longitudinal elastic modulus of a long fibre reinforced thermoplastic (LFT) composite (glass fibre/polypropylene). The modulus value predicted by OOF was then compared with the experimental value and values predicted by various models. It is shown that by taking into account the important microstructural parameters in the composite, i.e. the actual fibre orientation and distribution, accurate prediction of modulus can be obtained. List of symbolsd fibre diameter E cl longitudinal composite modulus E f fibre modulus E m matrix modulus G m shear modulus of the matrix , c critical fibre length r fibre radius R mean spacing of the fibres V f fibre volume fraction V m matrix volume fraction X i factor defining geometric packing arrangement of the fibres b shear lag parameter g , fibre length-efficiency factor g o Krenchel orientation factor j empirical factor s max fibre fracture strength t i shear strength of the fibre/matrix interface w max maximum packing fraction of the reinforcement w n fibre angle with respect to applied load Y function of the fibre volume fraction and w max

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Section: Introductionmentioning

confidence: 99%

Two-dimensional microstructure based modelling of Young's modulus of long fibre thermoplastic composite

Goel

Chawla

Vaidya

et al. 2008

Materials Science and Technology

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“…Although impact velocity alone does not describe the impact properties of a material but it can affect the energy dissipated during an impact (Bartus et al 2004). The change of the impactor's momentum as it passes through the specimen relates to the energy consumed by the fracture process.…”

Section: Effect Of Impactor Velocity On Composite Platesmentioning

confidence: 99%

The impact damage response of plain woven natural silk/epoxy laminated composite plates

Ude¹,

Ariffin²,

Sopian³

et al. 2010

Int. J. Eng. Sci. Tech

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This paper presents the impact response of woven natural silk (WNS)/Epoxy composite. The composite specimens were prepared in configurations of 10, 15, 20, 25 and 30 ply of WNS. Drop weight impact test was carried out under varied impact energies of 32J, 48J and 64J. Examinations of load bearing capability, energy absorption capability and damage process from initiation of damage to final perforation, with regards to increasing number of WNS Ply and increasing impact loads were investigated. It was observed that load bearing capability increases with increase in the number of WNS ply. Further investigation of each plate revealed that load bearing capability increases with increase in impact load. The energy absorption capability also increased with increase in the number of WNS ply. It is important to note that as the thickness of the specimen increases, delamination and surface area damage increased. The scanning electronics microscope (SEM) result showed mechanism of failure as a combination of delamination, fibre-matrix debonding, fibre breakage and interlaminar matrix cracking.

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“…More specifically, the addition of glass fiber in cut threads to a HDPE matrix produces a compound material of longitudinal elasticity module and fracture strength higher for HDPE under static loads (7,8), lower fluency coefficients (9) and greater impact strength (10).…”

Section: Introductionmentioning

confidence: 99%

Comportamiento de Sistemas Provisionales de Protección de Borde de polietileno de alta densidad frente a cargas estáticas y de impacto

et al. 2012

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We have tested under static and dynamic load temporary edge protection systems (TEPS) formed by a continuous fence, some are made of high density polyethylene (HDPE) and others have been manufactured using a composite material, adding glass fiber at a matrix of HDPE at a rate of 4%.Tests under static and impact have been performed according to standard UNE-EN 13374, class systems A and B. It has been found the influence of aging on TEPS and samples of the same materials as the TEPS.All tested TEPS exceed the strength requirements and accidental load and requirements compared to dynamic loads. The incorporation of glass fibers results in a composite material with a modulus of elasticity higher and significantly less creep. We haven't seen dependence on the results with the degree of aging or in SPPB or in the samples.Keywords: polymer; fiberre in forced; composite; flexural strength; creep. RESUMENSe han ensayado bajo cargas estáticas y dinámicas sistemas provisionales de protección de borde (SPPB) formados por una valla continua, unos fabricados con polietileno de alta densidad (HDPE) y otros con un material compuesto, añadiendo un 4% de fibra de vidrio a una matriz de HDPE.Los ensayos, bajo cargas estáticas y de impacto, se han realizado según la norma UNE-EN 13374, para sistemas clase A y B. Se ha comprobado la influencia del envejecimiento sobre SPPB y probetas de los mismos materiales que los SPPB.Todos los SPPB ensayados superan los requisitos de resistencia y de carga accidental y los requisitos frente a cargas dinámicas. La incorporación de fibras de vidrio da lugar a un material compuesto con un módulo de elasticidad significativamente más alto y con menor fluencia. No se aprecia dependencia de los resultados con el grado de envejecimiento ni en los SPPB ni en las probetas. INTRODUCTIONPolyethylene is a thermoplastic polymer combining a series of physical and mechanical properties such as a low density and a good strength-weight ratio, which together with the easiness to process it, becomes suitable for a great variety of applications, being plastic the mostly produced one (1, 2). Depending on the polymerization process employed, different types of polyurethane are obtained depending on the density. High density Polyurethane (HDPE) usually has densities in between 0.94 and 0.97 g/ cm 3 , the longitudinal elasticity is low, around 2000 N/mm 2 and presents high fluency values even for loads far from its elastic limit and for a short time, mainly for stress concentrators producing a fragile failure process (3-5).HDPE has excellent properties to be used as a component in collective protections (CP), where stresses are produced, mainly as impacts. The low value of the elasticity module, together with the great deformations reached before fracture, implies the possibility of absorbing a great quantity of energy. However, the low elasticity modules can be an inconvenience in certain occasions, as movements higher than the admitted by the standards regulating CP used are reached with HDPE systems. Moreover, agi...

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Performance of long fiber reinforced thermoplastics subjected to transverse intermediate velocity blunt object impact

Cited by 68 publications

References 17 publications

Two-dimensional microstructure based modelling of Young's modulus of long fibre thermoplastic composite

Two-dimensional microstructure based modelling of Young's modulus of long fibre thermoplastic composite

The impact damage response of plain woven natural silk/epoxy laminated composite plates

Comportamiento de Sistemas Provisionales de Protección de Borde de polietileno de alta densidad frente a cargas estáticas y de impacto

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