TABAKALI KOMPOZİT PLAKLARIN DÜŞÜK HIZLI DARBE ETKİSİNİN DENEYSEL ÇALIŞMASI

Öz

Bu çalışma düşük hızlı darbe yükü etkisi altında E-cam elyaf/epoxy tabakalı plakların tepkisinin incelenmesi ile ilgilidir. Darbe testleri, özel olarak tasarlanmış düşey ağırlık düşürme test cihazı kullanılarak yapılmıştır. Bu çalışmada 8 kat simetrik olarak tabakalanmış kompozitler kullanılmıştır. Bu kompozitler, [0/90]_2s, [-30/30]_2s, [-45/45]_2s olarak üç faklı şekilde istiflenmiştir ve sonuçları birbirleri ile karşılaştırılmıştır. Hasar oluşumları numunede batmadan başlayarak tam delinme durumuna kadar kademeli olarak incelenmiştir. Çalışmalar 140mmx140mm’lik kare plakların iki ve dört taraflı ankastre bağlantı durumlarında yapılmıştır. Darbe yükleri plak ortalarına uygulanmıştır.

Anahtar Kelimeler

• Düşük hızlı darbe,E-cam fiber/epoxy,tabakalı kompozit malzemeler

AN EXPERIMENTAL STUDY OF LOW VELOCITY IMPACT RESPONSE FOR COMPOSITE LAMINATED PLATES

Öz

This paper deals with the response of E-glass/epoxy laminated plates subjected to low velocity impact loading. Impact tests were performed using a specially designed vertical drop-weight testing machine. The samples used for this study were 8 plies symmetric laminated composites. These composites were characterized by three different stacking sequences, [0/90]_2s, [-30/30]_2s, [-45/45]_2s, and they were compared with each other. Specimens were impacted at constant weight and different impact energies. Damage processes examined step by step from initiation of damage to final perforation. The studies were carried out on plate dimension of 140mm x140mm with both four and two opposite sides clamped. Impact loads were applied at the center of each plate. 

Effect of different clamped cases, stacking sequences and impact energies were investigated on the composite structures.

Anahtar Kelimeler

• Low velocity impact; E-glass/epoxy; laminated composite materials

Kaynakça

1. [1] Komorowski J.P., D. Lefebvre, C. Roy, and C. Randon, “Stacking Sequence Effects and Delamination Growth in Graphite/Epoxy Laminates Under Compression-Dominated Fatigue Loading,” Composite Materials Fatigue and Fracture, Fifth Volume, ASTM STP1230, R.H. Martin, ed., American Society for Testing and Materials, Philadelphia, PA, pp. 249-267, (1995).
2. [2] Ratwani, M.M. and H. P. Kan, “Effect of Stacking Sequence on Damage Propagation and Failure Modes in Composite Laminate,” Damage in Composite Materials, ASTM STP 775, K.L. Reifsnider, ed., ASTM, pp. 211-228, (1982).
3. [3] Stinchcomb, W.W., K.L. Reifsnider, P. Yeung, and J. Masters, “Effect of Ply Constraint on Fatigue Damage Development in Composite Material Laminates,” Fatigue of Fibrous Composite Materials, ASTM STP 723, pp. 64-84, (1981).
4. [4] Robinson P, Davies GAO. Impactor mass and specimen geometry effects in low velocity impact on laminated composites. Int J Impact Eng;12(2):189–207 (1992).
5. [5] Liu D, Raju BB, Dang X. Size effects on impact response of composite laminates. Int J Impact Eng;21(10):837–54 (1998).
6. [6] Cantwell WJ. Geometrical effects in the low velocity impact response of GFRP. Compos Sci Technol; 67(9):1900–8 (2007).
7. [7] Abrate, S., Impact on Laminated Composite Materials, Applied Mechanics Review, Vol. 44, No.4, pp. 155-190, (1991).
8. [8] Abrate, S., Impact on Laminated Composites: Recent Advences, Applied Mechanics Review, Vol. 47, No 11, pp. 517-554, (1994).

9. [9] Abrate, S., Modeling of Impacts on Composite Structures, Composite Structures, Vol. 51, pp. 129-138, (2001).
10. [10] Thanomslip C, Hogg PJ., Penetration Impact Resistance of Hybrid Composites Based on Commingled Yarn Fabrics, Comp. Sci. Thecnol. Vol. 63, pp 467-82, (2003).
11. [11] Sadasivam B., Mallick PK., Impact Damage Resistance of Random Fiber Reinforced Automotive Composites, J. Theroplast. Compos. Mater., Vol. 15, pp 181-91, (2002).
12. [12] Naik NK., Ramasimha R., Arya H., Prabhu SV., ShamaRAo N., Impact Response and Damage Tolerance Characteristics of Glass-Carbon/Epoxy Hybrid Composite Plates, Composite Part B, 32:565-74, (2001).
13. [13] Aslan Z., Karakuzu R., Sayman O., Dynamic Characteristics of Laminated Woven E-glass/Epoxy composite plates subjected to low velocity heavy mass impact, J. Compos Mater 36(21): 241-42, (2002).
14. [14] Aslan Z., Karakuzu R., Okutan B., The Response of Laminated Composite Plates Under Low Velocity Impact Loading. Compos Struct, 59:119-27, (2003).