Stitch Cracks in Constraint Plies Adjacent to a Cracked Ply
| Autor: | J. Andre Lavoie, Erik Adolfsson |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Delamination Constraint (computer-aided design) Cross ply 02 engineering and technology Structural engineering 021001 nanoscience & nanotechnology Cracking 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Residual stress Fatigue loading Materials Chemistry Ceramics and Composites Thermal residual stress Composite material 0210 nano-technology business |
| Zdroj: | Journal of Composite Materials. 35:2077-2097 |
| ISSN: | 1530-793X 0021-9983 |
| Popis: | A high density form of matrixmicrocracking in constraint plies adjacent to a cracked ply, and here called stitch cracking, was found to form readily in awide variety of [+. n/–. n/902n] s laminates. Stitch cracks appear to form instead of interply delamination at the tip of the crack in the constrained ply, more typical of cross ply laminates, when the included angle is greater than 50°. Stitch cracks do not require fatigue loading to form, but appear due to thermal residual stress and monotonic loading. Stitch cracks were observed to instantly form in –. ° constraint plies next to a cracked 90° ply, apparently when the included angle of the plies was less than about 50°. In addition, they formed in –15° and –60° plies next to corresponding cracked +. ° surface plies. Data on stitch crack length and spacing is included. This paper seeks to raise awareness of stitch cracks by systematically demonstrating that they not only exist, but occur in awide variety of laminates. The data suggest that stitch cracks should not be overlooked during development of composite damage mechanics models. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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