Acoustic emission in carbon fibre-reinforced plastic materials

Siron, Olivier; Tsuda, Hiroshi

doi:10.1016/s0151-9107(01)80006-4

Cited by 15 publications

(11 citation statements)

References 4 publications

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“…As expected, this shows that [90°1 6 ] samples failure occurs without any fibre breakage and in addition without any fibre/matrix debonding if it is hypothesised that 65dB corresponds to this phenomenon (according to Fig. 9 results [71,72]). …”

Section: Mechanical Behaviour Of [90°1 6 ] Laminatessupporting

confidence: 70%

“…12 the laminate failure occurs without any fibre breakage, since none of the acoustic signals reaches and goes beyond 90dB. Let's now assume (as previously made) that for our laminates a 65dB magnitude [71,72] effectively corresponds to fibre/matrix debonding. In that case, for laminates cured at 160°C or at 200°C, the very first fibre/matrix debondings occur respectively for a 105 and a 90 MPa mechanical tensile stress (Fig.…”

Section: Mechanical Behaviour Of [±45°4] S Laminatesmentioning

confidence: 99%

“…9 Synthesis of refs. [71,72] results: correlation between the magnitude of acoustic signals (in dB) and kind of damages in a carbon/epoxy composite laminate (choice of the representative volume element) and for sufficiently high fibre volume fractions (i.e. at least V f = 60%), the presence of residual stresses induced an increase in laminate transverse ultimate tensile strength.…”

Section: Mechanical Behaviour Of [90°1 6 ] Laminatesmentioning

confidence: 99%

“…equipped with four piezoelectric sensors. Two of them are located near the sample end-tabs in order to eliminate noise signals coming from end-tabs and INSTRON jaws.Acoustic emission has been used for several year to assess the different events occurring during the mechanical testing of composites[71,72]. All damaging mechanisms, for which the propagation ends to cause the fracture of a composite part, generate sounds, noises, elastic waves or acoustic emission.…”

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confidence: 99%

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Designing curing conditions in order to analyse the influence of process-induced stresses upon some mechanical properties of carbon / epoxy laminates at constant Tg and degree of cure

Olivier

Sawi

2010

Int J Mater Form

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In the aim to study of the effects of processinduced stresses upon some mechanical properties of simple stacking sequence composite laminates, three different cure cycles were designed. This was achieved on the basis of a cure kinetics modelling. A minimum number of curing parameters were modified in order to restrain changes in material physical properties. Those latter were determined from the molecular network of the thermosetting matrix to the fibres volume fraction and thermal expansion of the laminated plates. The level of processinduced stresses generated by the three cure cycles was assessed by measuring the out-of-plane deflection on unsymmetrical laminated strips. Manufactured laminates were submitted to a set of tensile tests in order to determine the changes in their mechanical properties due to the different curing conditions. All the mechanical tests were followed by acoustic emission. This has enabled to distinguish the occurrence of the various damaging processes with respect to curing conditions and therefore process-induced stresses. Lastly, process-induced stresses on a micromechanical level were theoretically determined. This determination has enabled a first analysis of the effects of process-induced stresses upon mechanical properties to be settled.

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Section: Mechanical Behaviour Of [90°1 6 ] Laminatessupporting

confidence: 70%

Section: Mechanical Behaviour Of [±45°4] S Laminatesmentioning

confidence: 99%

Section: Mechanical Behaviour Of [90°1 6 ] Laminatesmentioning

confidence: 99%

mentioning

confidence: 99%

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Designing curing conditions in order to analyse the influence of process-induced stresses upon some mechanical properties of carbon / epoxy laminates at constant Tg and degree of cure

Olivier

Sawi

2010

Int J Mater Form

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show abstract

“…Damage was induced by quasi-static transverse loads that were supposed to simulate low velocity impacts [8][9][10][11][12][13]. The Acoustic Emission technique [14][15][16][17][18] was used, during the quasi-static transverse loading tests, in order to monitor the material damage progress and to measure the intensity of the emitted acoustic energy, which is required by the method proposed in [17], for the estimation of the quasi-static residual ultimate tensile strength (σ U * ) of the laminates. Concerning the AE physics, when components are loaded stress redistributions can occur, due to irreversible phenomena caused by damage mechanisms.…”

Section: Introductionmentioning

confidence: 99%