İki eksenli gerilme altındaki kompozit plakalarda dairesel delik çevresindeki gerilme dağılımları

Öz

Bu çalışmada, iki eksenli yükleme koşulları altındaki dairesel delikli karbon/epoksi kompozit plakalarda, delik etrafında meydana gelen gerilme dağılımları incelenmiştir. Öncelikle, Filiou ve Soutis [10] tarafından gerilme dağılımı için önerilen yaklaşık çözüm polinomlarının elde edilişi verilmiştir. Daha sonra, sonlu elemanlar yöntemi (FEM) kullanılarak oluşturulan modeller farklı iki eksenli yükleme oranlarıyla (λ) yüklenerek gerilme dağılımları elde edilmiştir. FEM ve analitik yöntemle elde edilen gerilme dağılımları karşılaştırılmış ve açıklamalar yapılmıştır

Anahtar Kelimeler

• Tabakalı kompozit malzemeler, iki eksenli yükleme, gerilme analizi

Öz

In this study, stress distributions around circular holes in carbon/epoxy composite plates under biaxial loading conditions are investigated. At first, the derivation of the approximate polynomial stress distributions developed by Filiou and Soutis is given [10]. Then, the stress distributions are obtained from the finite element models that are subjected to loading at various biaxiality ratios (λ). The analytical results are compared with the results obtained from FEM and explanations are given

Anahtar Kelimeler

• Layered composite materials, biaxial loading, stress analysis

Kaynakça

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3. Whitney, J. M. and Nuismer, R. J., ‘Stress Fracture Criteria for Laminated Composites Containing Stress Concentrations’, J. Comp. Mater. 8, 1974, 253–265.
4. Soutis, C. and Fleck, N. A., ‘Static Compression Failure of Carbon Fibre T800/924C Composite Plate with a Single Hole’, J. Comp. Mater. 24, 1990, 536–558.
5. Soutis, C., ‘Failure of Notched CFRP Laminates Due to Fibre Microbuckling: A Topical Review’, J. Mech. Behav. Materials 6, 1996, 309–330.
6. Savin, G. N., Stress Concentration around Holes, translated by Mr. E. Gros for the Depart. Sci. & Industrial Research, W. Johnson (ed.), Pergamon Press, 1961.
7. Lekhnitskii, S. G., Anisotropic Plates, translated from the second Russian edition by S.W. Tsai and T. Cheron, Gordon and Breach Science Publishers Inc., New York, 1968.
8. Filiou, C. and Soutis, C., Compression-Failure Modelling under Biaxial Loading, Progress Report II, Agreement no. SMCFU/654, DRA, October 1995.

9. Filiou, C. and Soutis, C., ‘Approximate Biaxial Stress Solution for Orthotropic Open-Hole Composite Laminates’, Adv. Comp. Letters 5, 1996, 107–112.
10. Filiou, C. and Soutis, C., ‘Approximate Stress Solution for Orthotropic Open-Hole Laminates Subjected to Biaxial Loading’, in 4th Internat. Conf. Deformation and Fracture of Composites, Sponsored by the Institute of Materials, UMIST, Manchester, UK, 24–26 March 1997, pp. 121–130.
11. Soutis, C., and Filiou, C., ‘Stress Distributions around Holes in Composite Laminates Subjected to Biaxial Loading’ Applied Composite Materials, 5, 1998, 365–
12. Konish, H. J. and Whitney, J. M., ‘Approximate Stresses in an Orthotropic Plate Containing a Circular Hole’, J. Comp. Mater. 9, 1975, 157–166.
13. ANSYS, User’s manual, Version 10.0, Swanson Analysis Systems, Inc., Houston, TX, USA. Hong, C. S., Crews, J. H. Jr., ‘Stress-Concentration Factors for Finite Orthotropic Laminates With a Circular Hole and Uniaxial Loading’, NASA Technical Paper 1469,
14. Tan, S. C., ‘Stress Concentrations in Laminated Composites’, Technomic Publishing Company Inc. (Lancester, Pennsylvania, USA), 1994.