The Static Mechanical Performance of Repaired Composite Sandwich Beams: Part I - Experimental Characterisation

Mahdi, S.; Kinloch, A. J.; Matthews, F.L.; Crisfield, M. A.

doi:10.1177/1099636203005002108

Cited by 22 publications

(50 citation statements)

References 3 publications

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“…In Fig. 12, when tested with the TF in compression, the beams performed as well, if not better than, the scarf repaired beams, a conclusion identical to that made when they were tested statically [3]. However, they failed prematurely from delamination of the repair patch when tested with the TF in tension.…”

Section: Fatigue Performance Of the Htc Repaired Beamssupporting

confidence: 70%

“…The results for the static mechanical performance of sandwich beams have been reported in an earlier paper [3]. In the present paper the failure load, failure strain, and bending stiffness of undamaged beams were compared with those of repaired beams.…”

Section: Static Resultsmentioning

confidence: 87%

“…However, it should be noted that failure occurred within 5 mm of the overlap end, and hence very close to the repair patch where modelling studies of HTC repaired beams, based on static loading [6], have identi ed an area of increased strain concentration. Although the static locus of failure was located away from this zone [3], it is suggested that the repeated cyclic loading weakened the beams in this area and hence caused failure to occur. Table 3 that increasing the scarf angle to 6¯did not have a signi cant effect on the fatigue life of HTC scarf repaired beams.…”

Section: High-temperature Cure Repair Systemmentioning

confidence: 99%

“…12, and a summary of the static failure loci and loads [3] is shown in Fig. 13 to allow comparisons to be made.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue performance of undamaged and repaired composite sandwich beams

Mahdi

Kinloch

Matthews

et al. 2003

Proceedings of the Institution of Mechanical Engineers, Part L:

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The behaviour of undamaged (i.e. as-manufactured) and repaired carbon bre reinforced plastic (CFRP) sandwich beams loaded in cyclic four-point bending is described. Three repair con gurations (one overlap and two scarf) were tested in tension and compression, and two repair systems (high-and lowtemperature cure) were employed. The repaired beams always showed an inferior performance compared with the as-manufactured beams. The lifetime was dependent on the repair con guration, with the overlap repairs performing surprisingly well when loaded in compression. The degradation of stiffness with cycling was also investigated and was related to the microscopic evolution of damage.

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Section: Fatigue Performance Of the Htc Repaired Beamssupporting

confidence: 70%

Section: Static Resultsmentioning

confidence: 87%

Section: High-temperature Cure Repair Systemmentioning

confidence: 99%

“…12, and a summary of the static failure loci and loads [3] is shown in Fig. 13 to allow comparisons to be made.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fatigue performance of undamaged and repaired composite sandwich beams

Mahdi

Kinloch

Matthews

et al. 2003

Proceedings of the Institution of Mechanical Engineers, Part L:

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show abstract

“…Ramantani [22] has investigated numerically the behavior of a repaired sandwich beam subjected to the four-point bending. Mahdi [23,24] also compared the behaviour of undamaged and repaired honeycomb sandwich beams …”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations of Honeycomb Sandwich Composite Panels With Open-hole Damage and Scarf Repair Subjected to Compressive Loads

Zhang

Yan

Jin

2015

The Journal of Adhesion

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The mechanical analysis of adhesive repair of honeycomb sandwich composite plate is more complicated than that of the laminated plate repair, because not only the laminated damage, but also the honeycomb buckling should be considered. Experimental and numerical investigations are carried out to understand the damage propagation and ultimate strength of both open-hole and repair plates under compressive load. The results of numerical models are verified by experimental data and they are found in good agreement. It is revealed from the results that the strength of open-hole plate is about 34% of the strength of intact plate, while the strength of repair plate could resume to 76% of that of intact plate after the repair process. It is found that the structure strength increases as the scarf repair angle decreases due to the decline of shear stress in the adhesive. We also present the optimum ply sequence and the optimum number of overlays in considering the improvement of structure strength. This research will be Downloaded by [University of Nebraska, Lincoln] at 10:52 23 August 2015 2 useful in improving the design and analysis techniques for scarf patch repair of sandwich structures.

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Shear performance assessment of repaired honeycomb sandwich composite panels: An experimental and numerical study

et al. 2023

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This article presents an effective test method for evaluating the shear performance of repaired honeycomb sandwich panels consisting of glass fiber/epoxy matrix skin and Nomex honeycomb core. Addressing the insufficient research on the shear performance of honeycomb sandwich panels after repair in existing literature, this study conducted mechanical performance tests on the honeycomb sandwich panels before and after repair using the picture frame test method. Surface strain measurements are obtained using digital image correlation (DIC) techniques, and load–displacement and shear stress–strain curves are generated from the experimental results. The study concludes that the repair method utilized in this investigation is effective in restoring the mechanical properties of the sandwich panels. In addition, finite element models of the honeycomb sandwich panels before and after repair are established, and a comparative analysis is conducted between the experimental and simulation results. The study examines the shear modulus, ultimate load, and failure mode of the repaired and unrepaired specimens. The findings verify the feasibility of the picture frame test method for evaluating the shear performance of honeycomb sandwich panels. This study provides valuable insights into the design of shear performance repair for honeycomb sandwich panels and offers theoretical support for material recycling.

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The Static Mechanical Performance of Repaired Composite Sandwich Beams: Part I - Experimental Characterisation

Cited by 22 publications

References 3 publications

Fatigue performance of undamaged and repaired composite sandwich beams

Fatigue performance of undamaged and repaired composite sandwich beams

Experimental and Numerical Investigations of Honeycomb Sandwich Composite Panels With Open-hole Damage and Scarf Repair Subjected to Compressive Loads

Shear performance assessment of repaired honeycomb sandwich composite panels: An experimental and numerical study

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