Investigation of impact damage in multi-directional tape laminates and its effect on local tensile stiffness

Craven, Robert; Sztefek, Pavel; Olsson, Robin

doi:10.1016/j.compscitech.2008.05.008

Cited by 18 publications

(10 citation statements)

References 12 publications

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“…in negligible stiffness reductions, while the combination of both delaminations and fibre cracks resulted in stiffness reductions similar to the ones observed in experiments (24) . These numerical results are also supported by experiments involving laminates where 5-20mm long central cuts had been made perpendicular to the fibres prior to curing (25) .…”

Section: Stiffness Of Impact Damage Zones In Tensionsupporting

confidence: 79%

“…Detailed models of generic impact damage zones under tension and compression have been presented (24,34) . Figure 22 simulates the 7J damage in the 2mm laminate in Fig.…”

Section: Finite Element Modelling Of Impact Damagementioning

confidence: 99%

“…The fibre OLSSON MODELLING OF IMPACT DAMAGE ZONES IN COMPOSITE LAMINATES FOR STRENGTH AFTER IMPACT 1361 Figure 22. Tensile stiffness of fibre damage combined with different delamination shapes (24) . cracks have a small influence on the average stress but have a large influence on the local buckling mode (34) .…”

Section: Finite Element Modelling Of Impact Damagementioning

confidence: 99%

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Modelling of impact damage zones in composite laminates for strength after impact

Olsson¹

2012

Aeronaut. j. (1968)

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This paper reviews findings on the type, morphology and constitutive behaviour of impact damage zones during loading after impact and their effect on the laminate strength and stability. The paper is limited to tape prepreg based monolithic laminates, although some similarities exist with impact damage in textile based laminates. Damage zones have a complex geometry with several damage types, which results in an interaction and competition between different failure mechanisms, e.g. local and global buckling, compressive failure, and delamination growth. Hence, simplified damage models may provide incorrect predictions of the failure load and failure mechanisms after impact. The constitutive behaviour of damage zones has been studied experimentally in tension and compression using an inverse method, and the results have been compared with detailed FE models of a generic impact damage. The paper is concluded with a discussion on analytical and computational models to predict the resulting strength of impacted laminates.

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Section: Stiffness Of Impact Damage Zones In Tensionsupporting

confidence: 79%

“…Detailed models of generic impact damage zones under tension and compression have been presented (24,34) . Figure 22 simulates the 7J damage in the 2mm laminate in Fig.…”

Section: Finite Element Modelling Of Impact Damagementioning

confidence: 99%

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Modelling of impact damage zones in composite laminates for strength after impact

Olsson¹

2012

Aeronaut. j. (1968)

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“…8; double ellipse delaminations are a feature characteristic of one of four primary delamination patterns summarized by Craven et al [34]. The reverse face of the specimens showed a small amount of ply push-out confined within the 35 mm diameter hole of the tool.…”

Section: Non-destructive Inspectionmentioning

confidence: 97%

The influence of preload and boundary conditions on pre-damaged composite plates subject to soft-body impact

McCallum

2015

Materials & Design

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“…The shear force ratio Q d =Q 0 is calculated based on equation (11), which is 0.987. So according to equation (12), the ratio of flexural stiffness D d /D 0 equals 0.43. The next step is to determine the possible spatial distributions of delaminations that correspond most closely to this estimated value of the reduced bending stiffness.…”

Section: Determining the Number And Length Of Delaminationsmentioning

confidence: 99%

Inverse methods for quantitative assessment of delamination damage based on vibrational response

Rose

Wang

2015

Structural Health Monitoring

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A novel two-step approach for quantifying laminar damages, such as delaminations in composites, is presented. This new approach first employs the gapped smoothing method to locate the edges of damage from the vibrational curvature data, followed by an inverse method to determine the through-thickness location of delaminations that provide the best match with the local reduction in bending stiffness over the damaged region. Practical aspects of the implementation of this procedure are discussed, and the approach is demonstrated using both simulated and experimental data. The role of sample spacing on the accuracy of damage location is investigated systematically and it is shown that an optimum spacing exists for experimental data containing noise. The inverse method is found to be able to provide detailed information of delaminations when the searching space is limited, and it can also be used to determine the effective flexural stiffness for complex delamination damage.

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Investigation of impact damage in multi-directional tape laminates and its effect on local tensile stiffness

Cited by 18 publications

References 12 publications

Modelling of impact damage zones in composite laminates for strength after impact

Modelling of impact damage zones in composite laminates for strength after impact

The influence of preload and boundary conditions on pre-damaged composite plates subject to soft-body impact

Inverse methods for quantitative assessment of delamination damage based on vibrational response

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