| タイトル | Combined effect of matrix cracking and stress-free edge on delamination |
| 本文（外部サイト） | http://hdl.handle.net/2060/19900011810 |
| 著者（英） | Obrien, T. K.; Salpekar, S. A. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 1990-03-01 |
| 言語 | eng |
| 内容記述 | The effect of the stress-free edge on the growth of local delaminations initiating from a matrix crack in (0 sub 2/90 sub 4) sub s and (+ or - 45.90 sub 4) sub s glass epoxy laminates is investigated using 3-D finite element analysis. The presence of high interlaminar normal stresses at the intersection (corner) of the matrix crack with the stress-free edge, suggests that a mode I delamination may initiate at the corners. The strain energy release rates (G) were calculated by modeling a uniform through-width delamination and two inclined delaminations at 10.6 deg and 45 deg to the matrix crack. All components of G have high values near the free edges. The mode I component of G is high at small delamination length and becomes zero for a delamination length of one-ply thickness. The total G values near the free edge agreed well with previously derived closed form solution. The quasi-3D solutions agreed well with the 3-D interior solutions. |
| NASA分類 | COMPOSITE MATERIALS |
| レポートNO | 90N21126
NAS 1.15:102591
NASA-TM-102591
AVSCOM-TM-90-B-002 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/138327 |
