Bending of Composite Cylindrical Shells with Circular Cutouts: Experimental Validation

An experimental study of unstiffened graphite-epoxy cylindrical shells with cutouts subjected to bending load is presented. Two cylinders were tested: a classical laminated cylinder with constant-stiffness and a fiber-steered cylinder with variable stiffness in circumferential direction. Both cylind...

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Bibliographic Details
Published in:Journal of aircraft 2019-07, Vol.56 (4), p.1534-1550
Main Authors: Labans, Edgars, Bisagni, Chiara, Celebi, Mansur, Tatting, Brian, Gürdal, Zafer, Blom-Schieber, Agnes, Rassaian, Mostafa, Wanthal, Steven
Format: Article
Language:English
Subjects:
Airframes
Collapse
Composite structures
Correlation analysis
Cylinders
Cylindrical shells
Damage assessment
Data compression
Digital imaging
Displacement
Finite element method
Fuselages
Graphite fiber reinforced plastics
Graphite-epoxy composites
Stiffness
Strain gauges
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Summary:An experimental study of unstiffened graphite-epoxy cylindrical shells with cutouts subjected to bending load is presented. Two cylinders were tested: a classical laminated cylinder with constant-stiffness and a fiber-steered cylinder with variable stiffness in circumferential direction. Both cylinders were tested until collapse in displacement control. Displacements and strains were measured by displacement sensors, strain gauges, and two digital image correlation systems. Analysis of the test data indicates that the highest stressed area was the edges of the cutouts where local displacements created large compression strains. The experimental data were compared with progressive damage analysis results obtained with a finite element analysis that included measured geometrical imperfections. The research contributes to the knowledge of variable-stiffness composite structures and their applications in aircraft fuselages.
ISSN:1533-3868
0021-8669
1533-3868
DOI:10.2514/1.C035247