Composites Science and Technology

Items from 1 to 20 out of 6,715 results

article

The effects of a water environment on anomalous absorption behavior in graphite/epoxy composites

J. Zhou, J.P. Lucas

Composites Science and Technology > 1995 > 53 > 1 > 57-64

The effects of a water environment on moisture (H ₂ O) absorption characteristics of a unidirectional T300/934 graphite/epoxy composite material have been investigated by the measurement and analysis of weight change, hygrothermal induced expansion, surface crack formation, and surface mass loss. Specimens were immersed in distilled water at 45, 60, 75, and 90°C for more than 8000 h. Weight-change...

article

A double-plate finite-element model for the impact-induced delamination problem

S. Zheng, C.T. Sun

Composites Science and Technology > 1995 > 53 > 1 > 111-118

A double-plate model is proposed to simulate a composite laminate with impact-induced delamination. Mindlin plate finite elements with large deflection have been employed to calculate stress and strain fields. On the basis of the modified crack closure method, a general expression for the strain energy release rate at the delamination front is derived. The proposed model was first evaluated by using...

article

A new methodology for the prediction of fatigue failure in multidirectional fiber-reinforced laminates

F. Ellyin, Z. Fawaz

Composites Science and Technology > 1995 > 53 > 1 > 47-55

This paper deals with the development of a new methodology for the prediction of fatigue failure in multidirectional fiber-reinforced laminates. It is proposed that the lamina-to-laminate prediction concept be refined to take into account the constrained condition of the individual laminae in a multidirectional laminate. In practical terms, this means that basic properties of the individual laminae...

article

Effect of ageing on the physical and mechanical properties of sisal-fiber-reinforced polyethylene composites

S. Thomas, K. Joseph, C. Pavithran

Composites Science and Technology > 1995 > 53 > 1 > 99-110

The effects of ageing on the mechanical properties and dimensional stability of cardanol derivative of toluene diisocyanate (CTDIC) treated and untreated sisal/LDPE composites have been studied. The ageing properties of the sisal composites were compared to those of glass-fiber composites aged under identical conditions. The tensile properties and dimensional stability were evaluated under two different...

article

Tailoring thermal deformation by using layered beams

R.C. Wetherhold, J. Wang

Composites Science and Technology > 1995 > 53 > 1 > 1-6

In application, many thin structural components such as beams, plates and shells experience a through-thickness temperature variation. This temperature variation can produce both an in-plane expansion and an out-of-plane (bending) curvature. Given that these thin components interact with or connect to other components, we often wish to minimize the thermal deformation or march the thermal deformation...

article

Conference diary

Composites Science and Technology > 1995 > 53 > 1 > 119-120

article

Experimental evaluation of delaminations in composite plates by the use of lamb waves

B.S. Wong, K.S. Tan, N. Guo, C.G. Tui

Composites Science and Technology > 1995 > 53 > 1 > 77-84

The fundamental S ₀ mode of Lamb waves can be used in testing for delaminations in plate material. By scanning over the surface beneath which a delamination lies, it is possible to measure the size of the delamination. The amplitude of the wave decreases over a delamination. It has been found that the phase velocity does not change significantly with the depth of delamination. The rate of...

article

Heat-treatment parameters for a 359/Al ₂ O ₃ /10p composite modified wiyh 0.07 wt% strontium

F.H. Samuel, A.M. Samuel

Composites Science and Technology > 1995 > 53 > 1 > 85-98

In melt-produced composites, the properties of particle-reinforced aluminum metal-matrix composites (MMCs) can be compromised by the interfacial reactions that may occur between the molten matrix and the reinforcement depending on the melt conditions. The reinforcement can also considerably influence the response of the matrix alloy to solution heat treatment and age-hardening. A study of the melting...

article

Residual strength evaluation of impacted GRP laminates with acoustic emission monitoring

R. Teti, G. Caprino

Composites Science and Technology > 1995 > 53 > 1 > 13-19

This paper deals with tensile testing of GRP laminates containing impact damage generated with different impact energies. Acoustic emission (AE) detection and analysis was used to attempt the prediction of residual tensile strength after impact (RTSAI). A modified version of a previous model for residual strength of center-hole composite laminates is proposed. Its rationale is the introduction of...

article

The effects of ageing and whisker-orientation on wear behaviour of SiC _w /Al composites under unlubricated sliding friction

D.Z. Wang, H.X. Peng, J. Liu, C.K. Yao, more

Composites Science and Technology > 1995 > 53 > 1 > 21-25

The effects of ageing and whisker-orientation on the wear behaviour of SiC _w /Al composites under unlubricated sliding friction have been investigated. The surface profiles of 52100 steel rings against MMC samples with different ageing treatments were also studied. The results show that the whisker orientation in an as-extruded SiC _w /Al composite exerts a significant influence on...

article

Effect of isothermal exposure on the failure behavior of 1D-SCS6/super-α2 intermetallic-matrix composites

F. Della Martina, Y. Le Petitcorps, J.M. Quenisset, B. Coutand

Composites Science and Technology > 1995 > 53 > 1 > 65-75

The effects of isothermal exposure on the failure mechanisms of composites with a titanium aluminide matrix have been investigated through the evaluation of their tensile properties at room temperature after high-temperature heat treatments. The composites have been processed by hot pressing unidirectional arrays of SiC filaments between Ti ₃ Al based foils. Owing to the importance of the...

article

Elastic moduli and interlaminar shear strength of a bidirectional carbon/carbon composite after heat treatment

K. Kromp, A. Domnanovich, H. Peterlik, B. Wanner

Composites Science and Technology > 1995 > 53 > 1 > 7-12

In this work a bidirectionally laminated carbon/carbon composite has been heat treated ('graphitized') at three different temperatures (1800, 2100, and 2400°C). The Young's modulus, E ₁ ₁ , the intralaminar modulus, G ₁ ₂ , and the interlaminar shear modulus, G ₁ ₃ , were measured by a resonant beam method for the three modifications. It is shown that an increase...

article

Effects of a composite-like stress state on the fracture of epoxies

L.A. Berglund, L.E. Asp, P. Gudmundson

Composites Science and Technology > 1995 > 53 > 1 > 27-37

The strain to failure of a transversely loaded composite is much lower than for the pure matrix in uniaxial tension. Several studies of composites suggest the triaxial matrix stress state as one of the explanations. In order to investigate this experimentally, a triaxial tensile test previously used for rubbers (the poker-chip rest) was successfully applied to four epoxies in the glassy state. The...

article

Effect of temperature and strain rate on interfacial shear stress transfer in carbon/epoxy model composites

C. Migliaresi, M. Detassis, A. Pegoretti

Composites Science and Technology > 1995 > 53 > 1 > 39-46

The amount of stress transferred in a composite from the matrix to the fibre has been determined in an epoxy/carbon system by using a fragmentation test on single-fibre model composites (microcomposites), as a function of temperature and strain rate. Experiments, performed on microcomposites containing commercial carbon fibres, with and without sizing agent, and an epoxy resin of low glass transition...

article

Compression strength reductions in composite laminates due to multiple-layer waviness

S.J. Bell, D. O'Hare Adams

Composites Science and Technology > 1995 > 53 > 2 > 207-212

The effects of multiple-layer regions of waviness on static compression strength were investigated. A single-step fabrication method was developed for fabricating multiple-nested wavy 0 ^° layers into otherwise wave-free thermoset crossply laminates. Laminates were fabricated with varying percentages of 0 ^° layers containing layer waviness, but all with a constant layer wave severity...

article

The effect of fibre waviness on the mechanical properties of unidirectional fibre composites: A review

M.R. Piggott

Composites Science and Technology > 1995 > 53 > 2 > 201-205

Four properties of unidirectional fibre composites are shown to be influenced by fibre waviness. Compressive strength (and also modulus) can be related to fibre waviness by relatively simple equations. Loss in strength during fatigue does not lend itself so easily to simple analysis, but seems to be readily explicable if the fibres are not straight. Shear strength parallel to the fibres is greater...

article

Determination of 3D fiber orientation distribution in thermoplastic injection molding

J.J. McGrath, J.M. Willie

Composites Science and Technology > 1995 > 53 > 2 > 133-143

An automated optical section method for quantifying the orientation state of short fibers in injection molded parts is presented. The method is based on imaging tracer fibers in index of refraction-matched transparent composites. The experimental methods and performance characteristics of the method are described. The method is non-destructive, operator-independent, economical and rapid. Scanning...

article

A quantitative comparison of morphology and fibre orientation in push-pull processed and conventional injection-moulded parts

H.-C. Ludwig, G. Fischer, H. Becker

Composites Science and Technology > 1995 > 53 > 2 > 235-239

Push-pull processing is a new processing technology for thermoplastic materials. The mould has two gates which are connected to two synchronised injection units. The melt is moved several times through the mould during the packing phase. This modified filling process influences the orientation of fibres and matrix in a part significantly: the core layer of short-fibre-reinforced material is completely...

article

The use of Moire interferometry as an aid to standard test-method development for textile composite materials

P.G. Ifju, J.E. Masters, W.C. Jackson

Composites Science and Technology > 1995 > 53 > 2 > 155-163

The viability of advanced textile composites as an efficient aircraft material is currently being addressed in the NASA Advanced Composites Technology (ACT) Program. One of the expected milestones of the program is to develop standard test methods for these complex material systems. Current test methods for laminated composites may not be optimum for textile composites, since the architecture of the...

article

Ultrasonic NDE techniques for the evaluation of matrix cracking in composite laminates

K.V. Steiner, R.F. Eduljee, X. Huang, J.W. Jr. Gillespie

Composites Science and Technology > 1995 > 53 > 2 > 193-198

Experimental methods for detecting matrix cracking in composites specimens are often costly and time consuming. In an effort to maximize the information obtained from experimental tests and to establish a correlation between the experimental and non-destructive evaluation (NDE) techniques, a series of investigations have been undertaken. To evaluate the progression of matrix cracks in BMI composite...

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B. MECHANICAL PROPERTIES (994)
B. ELECTRICAL PROPERTIES (398)
A. POLYMER–MATRIX COMPOSITES (PMCS) (368)
A. CARBON NANOTUBES (354)
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C. DELAMINATION (164)
A. CARBON FIBRES (156)
D. SCANNING ELECTRON MICROSCOPY (SEM) (156)
B. FRACTURE (154)
A. PARTICLE-REINFORCED COMPOSITES (148)
B. INTERFACIAL STRENGTH (143)
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C. ELASTIC PROPERTIES (130)
A. SMART MATERIALS (125)
COMPOSITES (123)
A. POLYMERS (120)
A. CARBON FIBERS (118)
B. MICROSTRUCTURE (118)
B. MODELLING (117)
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INTERFACE (108)
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B. IMPACT BEHAVIOUR (106)
A. LAYERED STRUCTURES (105)
B. THERMOMECHANICAL PROPERTIES (104)
NANO COMPOSITES (104)
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D. RAMAN SPECTROSCOPY (74)
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A. STRUCTURAL COMPOSITES (70)
COMPOSITE (69)
D. ACOUSTIC EMISSION (68)
A. LAMINATE (67)
A. FIBERS (66)
E. EXTRUSION (65)
POLYMER-MATRIX COMPOSITES (65)
B. SURFACE TREATMENTS (64)
C. MODELING (64)
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A. ADHESIVE JOINTS (50)
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INFONA - science communication portal

Composites Science and Technology

The effects of a water environment on anomalous absorption behavior in graphite/epoxy composites

A double-plate finite-element model for the impact-induced delamination problem

A new methodology for the prediction of fatigue failure in multidirectional fiber-reinforced laminates

Effect of ageing on the physical and mechanical properties of sisal-fiber-reinforced polyethylene composites

Tailoring thermal deformation by using layered beams

Conference diary

Experimental evaluation of delaminations in composite plates by the use of lamb waves

Heat-treatment parameters for a 359/Al ₂ O ₃ /10p composite modified wiyh 0.07 wt% strontium

Residual strength evaluation of impacted GRP laminates with acoustic emission monitoring

The effects of ageing and whisker-orientation on wear behaviour of SiC _w /Al composites under unlubricated sliding friction

Effect of isothermal exposure on the failure behavior of 1D-SCS6/super-α2 intermetallic-matrix composites

Elastic moduli and interlaminar shear strength of a bidirectional carbon/carbon composite after heat treatment

Effects of a composite-like stress state on the fracture of epoxies

Effect of temperature and strain rate on interfacial shear stress transfer in carbon/epoxy model composites

Compression strength reductions in composite laminates due to multiple-layer waviness

The effect of fibre waviness on the mechanical properties of unidirectional fibre composites: A review

Determination of 3D fiber orientation distribution in thermoplastic injection molding

A quantitative comparison of morphology and fibre orientation in push-pull processed and conventional injection-moulded parts

The use of Moire interferometry as an aid to standard test-method development for textile composite materials

Ultrasonic NDE techniques for the evaluation of matrix cracking in composite laminates

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