![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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/1.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/2.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/3.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/4.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/5.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/6.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/7.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/8.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/9.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/10.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/11.jpg)
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](https://reader036.vdocuments.site/reader036/viewer/2022062423/5697bf861a28abf838c882db/html5/thumbnails/12.jpg)
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