Effect of stress concentrations in flexible matrix composite driveshafts

Stanton G. Sollenberger, Charles E. Bakis, Edward Smith

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Flexible matrix composites (FMCs), consisting of a high volume fraction of strong, rigid fibers in a soft, flexible matrix, are attractive candidate materials for one-piece rotorcraft drivelines that can accommodate misalignment without the use of mid-span flex-joints. This paper reports on a preliminary experimental investigation of the effects of circular through-holes on the stiffness and strength of small-scale, filament-wound FMC shafts under axial compression and axial tension. Shaft with holes were also subjected to spin tests with misalignment from end-to-end. It is shown that the hole has a more deleterious effect on the axial compressive strength than on the axial tensile strength, but that the notch sensitivity of FMCs in general is significantly less than that seen in conventional rigid matrix composites. Based on x-ray radiographic inspection, it is shown that FMC shafts spun with representative flexural strains show no signs of damage growth near the hole. This information is a step towards the implementation of FMC materials in advanced rotorcraft drivelines.

Original languageEnglish (US)
Pages (from-to)1054-1060
Number of pages7
JournalAnnual Forum Proceedings - AHS International
Volume2
StatePublished - 2009

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Stress concentration
Composite materials
Axial compression
Compressive strength
Volume fraction
Tensile strength
Inspection
Stiffness
X rays
Fibers

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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abstract = "Flexible matrix composites (FMCs), consisting of a high volume fraction of strong, rigid fibers in a soft, flexible matrix, are attractive candidate materials for one-piece rotorcraft drivelines that can accommodate misalignment without the use of mid-span flex-joints. This paper reports on a preliminary experimental investigation of the effects of circular through-holes on the stiffness and strength of small-scale, filament-wound FMC shafts under axial compression and axial tension. Shaft with holes were also subjected to spin tests with misalignment from end-to-end. It is shown that the hole has a more deleterious effect on the axial compressive strength than on the axial tensile strength, but that the notch sensitivity of FMCs in general is significantly less than that seen in conventional rigid matrix composites. Based on x-ray radiographic inspection, it is shown that FMC shafts spun with representative flexural strains show no signs of damage growth near the hole. This information is a step towards the implementation of FMC materials in advanced rotorcraft drivelines.",
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Effect of stress concentrations in flexible matrix composite driveshafts. / Sollenberger, Stanton G.; Bakis, Charles E.; Smith, Edward.

In: Annual Forum Proceedings - AHS International, Vol. 2, 2009, p. 1054-1060.

Research output: Contribution to journalArticle

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