| Autor: |
D.W. Sleight, I.S. Raju, John T. Wang |
| Rok vydání: |
1995 |
| Předmět: |
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| Zdroj: |
Composites Engineering. 5:277-296 |
| ISSN: |
0961-9526 |
| DOI: |
10.1016/0961-9526(94)00097-s |
| Popis: |
Fracture mechanics analyses of composite skin-stiffener debond configurations using shell elements are presented. Two types of debond configurations are studied: a flange skin strip debond configuration and a skin-stiffener debond configuration. The flange-skin strip configuration examines debond growth perpendicular to the stiffener while the skin-stiffener configuration examines debond growth parallel to the stiffener. Four-node and 9-node shell elements are used to model both debond configurations. The stiffener flange and skin are modeled as two different layers of elements whose translational degrees-of-freedom, in the bonded portion, of the corresponding flange and skin nodes are constrained to be identical. Strain energy release rate formulae are presented for both 4-node and 9-node element models based on the virtual crack closure technique (VCCT). In addition, average values of the strain energy release rates are calculated using a gradient method. The VCCT formulae and the gradient method are used to compute the strain energy release rates ( G -values) for both debond configurations. The G -values predicted by these methods are compared with those predicted by plane-strain and 3D finite element analyses. Excellent correlation is obtained among all the analysis results, thus helping to validate the VCCT formulae derived for the 4- and 9-node shell elements. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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