Rheometry of compression moulded fibre-reinforced polymer composites: Rheology, compressibility, and friction forces with mould surfaces

Guiraud, Olivier; Dumont, Pierre; Orgéas, Laurent; Favier, Denis

doi:10.1016/j.compositesa.2012.06.006

Cited by 39 publications

(23 citation statements)

References 31 publications

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“…Moreover, its low viscosity enables room-temperature infusion. SMC and A-SMC are ideal for large structural automotive components because of their high strength-to-weight ratio [6,7]. Due to significant tooling investment, overall component cost savings resulting from part consolidation, with the same coefficient of thermal expansion as steel and excellent corrosion resistance; A-SMC is an ideal alternative to metals and can be used in the same fluctuating temperature environments [8,9].…”

Section: Introductionmentioning

confidence: 99%

High strain rate visco-damageable behavior of Advanced Sheet Molding Compound (A-SMC) under tension

Shirinbayan

Fitoussi

Meraghni

et al. 2015

Composites Part B: Engineering

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a b s t r a c tAdvanced Sheet Molding Compound (A-SMC) is a serious composite material candidate for structural automotive parts. It has a thermoset matrix and consists of high weight content of glass fibers (50% in mass) compared to standard SMC with less than 30% weight fiber content. During crash events, structural parts are heavily exposed to high rates of loading and straining. This work is concerned with the development of an advanced experimental approach devoted to the micro and macroscopic characterization of A-SMC mechanical behavior under high-speed tension. High speed tensile tests are achieved using servo-hydraulic test equipment in order to get required high strain rates up to 100 s À1 . Local deformation is measured through a contactless technique using a high speed camera. Numerical computations have led to an optimal design of the specimen geometry and the experimental damping systems have been optimized in terms of thickness and material properties. These simulations were achieved using ABAQUS explicit finite element code. The developed experimental methodology is applied for two types of A-SMC: Randomly Oriented (RO) and Highly Oriented (HO) plates. In the case of HO samples, two tensile directions were chosen: HO-0 (parallel to the Mold Flow Direction (MFD)) and HO-90 (perpendicular to the MFD). High speed tensile tests results show that A-SMC behavior is strongly strain-rate dependent although the Young's modulus remains constant with increasing strain rate. In the case of HO-0 , the stress damage threshold is shown an increase of 63%, when the strain rate varies from quasi-static (0.001 s À1 ) to 100 s À1 . The experimental methodology was coupled to microscopic observations using SEM. Damage mechanisms investigation of HO and RO specimens showed a competition between two mechanisms: fiber-matrix interface debonding and pseudo-delamination between neighboring bundles of fibers. It is shown that pseudo-delamination cannot be neglected. In fact, this mechanism can greatly participate to energy absorption during crash. Moreover, the influence of fiber orientation and imposed velocity is studied. It is shown that high strain rate and oriented fiber in the tensile direction favor the pseudo-delamination.

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Section: Introductionmentioning

confidence: 99%

High strain rate visco-damageable behavior of Advanced Sheet Molding Compound (A-SMC) under tension

Shirinbayan

Fitoussi

Meraghni

et al. 2015

Composites Part B: Engineering

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“…A high viscosity epoxy matrix is required to avoid fibre/matrix separation during moulding [12], which can be a particular problem for ribbed parts [13]. However, a high viscosity can limit macroscopic charge flow due to higher friction levels at the mould-composite interface [14], increasing the required moulding pressures. Initial coverage of the tool therefore tends to be high (~80-90%), inevitably increasing the amount of touch-labour required to layup and position the charge, negating some of the advantages of using a moulding compound over a prepreg system.…”

Section: Introductionmentioning

confidence: 99%

Flow characteristics of carbon fibre moulding compounds

Evans

Qian

Turner

et al. 2016

Composites Part A: Applied Science and Manufacturing

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This paper presents the development of a low-cost carbon fibre moulding compound using an automated spray deposition process. Directed Fibre Compounding (DFC) is used to produce charge packs directly from low cost carbon fibre tows and liquid epoxy resin. A range of material and process related parameters have been studied to understand their influence on the level of macroscopic charge flow, in an attempt to produce a carbon fibre moulding compound with similar flow characteristics to conventional glass fibre SMCs.Charge packs covering just 40% of the mould can be effectively used to process DFC, without detrimentally affecting void content, fibre distribution and mechanical properties. Tensile stiffness and strength values of 36GPa and 320MPa are reported for isotropic materials (100% charge coverage), which increase to 46GPa and 408MPa with flow induced alignment (50% charge coverage) at 50% fibre volume fraction.

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“…Furthermore, the processed entanglements were subjected to compression cycles at various temperatures and strain rates ranging respectively from 293 K to 353 K and from 4 10 −4 s −1 to 3.7 10 −2 s −1 . The samples were placed inside a compression rheometer with parallel plates equipped with an inner heating system [28] and mounted on a mechanical machine (MTS DY26, maximum force 100 kN). During the tests, the recorded compression force, F , and the current sample height, H, were used to estimate the nominal 6 compression stress σ = 4F/πD 2 0 and global axial compression Hencky strain ε g = ln(H/H 0 ).…”

Section: Thermomechanical Characterizationmentioning

confidence: 99%

Entangled single-wire NiTi material: A porous metal with tunable superelastic and shape memory properties

et al. 2015

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International audienceNiTi porous materials with unprecedented superelasticity and shape memory were manufactured by self-entangling, compacting and heat treating NiTi wires. The versatile processing route used here allows to produce entanglements of either superelastic or ferroelastic wires with tunable mesostructures. Three dimensional (3D) X-ray microtomography shows that the entanglement mesostructures are homogeneous and isotropic. The thermomechanical compressive behavior of the entanglements was studied using optical measurements of the local strain field. At all relative densities investigated here (similar to 26-36%), entanglements with superelastic wires exhibit remarkable macroscale superelasticity, even after compressions up to 25%, large damping capacity, discrete memory effect and weak strain-rate and temperature dependencies. Entanglements with ferroelastic wires resemble standard elastoplastic fibrous systems with pronounced residual strain after unloading. However, a full recovery is obtained by heating the samples, demonstrating a large shape memory effect at least up to 16% strain

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Rheometry of compression moulded fibre-reinforced polymer composites: Rheology, compressibility, and friction forces with mould surfaces

Cited by 39 publications

References 31 publications

High strain rate visco-damageable behavior of Advanced Sheet Molding Compound (A-SMC) under tension

High strain rate visco-damageable behavior of Advanced Sheet Molding Compound (A-SMC) under tension

Flow characteristics of carbon fibre moulding compounds

Entangled single-wire NiTi material: A porous metal with tunable superelastic and shape memory properties

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