bending strength of delaminated aerospace composites by moustafa kinawy, richard butler, and giles...

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Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797 April 28, 2012 ©2012 by The Royal Society

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Page 1: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Bending strength of delaminated aerospace composites

by Moustafa Kinawy, Richard Butler, and Giles W. Hunt

Philosophical Transactions AVolume 370(1965):1780-1797

April 28, 2012

©2012 by The Royal Society

Page 2: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Delaminated beam coordinates and variables.

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society

Page 3: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Force and moment components at the delamination edge.

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society

Page 4: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Four-point bending test fixture showing specimen with delamination open (loaded above snap-buckling moment).

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society

Page 5: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Applied moment versus displacement for T800/M21 specimen.

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society

Page 6: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Electron scanning microscopy (ESM) images of fracture surfaces for T800/M21 material.

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society

Page 7: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Delamination extension versus number of cycles for T800/M21 specimens at a range of severities.

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society

Page 8: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Delamination extension versus number of cycles for IM7/8552 specimens at a range of severities.

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society

Page 9: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Equilibrium solutions showing analytical displacement Q1 against applied moment per unit width M for a range of imperfections Q0 (T800/M21 specimen).

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society

Page 10: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Out-of-plane displacement Q1 comparison for (a) T800/M21 specimen and (b) IM7/8552 specimen.

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society

Page 11: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Strain energy release rate using the thin-film and mixed-mode analyses for the delaminated, post-buckled beam: T800/M21 specimens.

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society

Page 12: Bending strength of delaminated aerospace composites by Moustafa Kinawy, Richard Butler, and Giles W. Hunt Philosophical Transactions A Volume 370(1965):1780-1797

Strain energy release rate using the thin-film and mixed-mode analyses for the delaminated, post-buckled beam: IM7/8552 specimens.

Moustafa Kinawy et al. Phil. Trans. R. Soc. A 2012;370:1780-1797

©2012 by The Royal Society