PSI - Issue 61

Ahmet Çevik et al. / Procedia Structural Integrity 61 (2024) 291–299 Cevik et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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• Failure propagates both as inter-ply failure at the interface between the plies (delamination) and intra-ply failure at the interfaces between the warp and yarn region inside the plies. • The crack tip speeds are observed to be fluctuating between 1500 m/s and 500 m/s in the curved region whereas for the lower arm fluctuates between 2000 m/s and 1000 m/s. • Intersonic crack tip speed is observed briefly in the arm before full arrest occurs due to the compression of the vertical arm by fixture clamping. • The architecture of the fabric material can play a role in the propagation and speed history of a crack tip. Acknowledgements The authors would like to thank METU Center for Wind Energy for the use of their facilities. References Avalon, S. C., Donaldson, S. L., 2011. Strength of composite angle brackets with multiple geometries and nanofiber-enhanced resins. Journal of Composite Material, 45 , 1017-1030. Chaurasia, B. K., Kumar, D., & Paswan, M. K., 2023. Experimental studies of failure in l-shaped carbon fiber-reinforced polymer composite under pullout and four-point bending. Journal of The Institution of Engineers (India): Series D, 104(2), 569-579. Coker, D., Rosakis, A. J., 2001. Experimental observations of intersonic crack growth in asymmetrically loaded unidirectional composite plates. Philosophical Magazine A, 81(3), 571-595. Gozluklu, B., Uyar, I., & Coker, D., 2015. Intersonic delamination in curved thick composite laminates under quasi-static loading. Mechanics of Materials, 80, 163-182. Hu, Q., Zhang, Y., Mao, Y., Memon, H., Qiu, Y., Wei, Y., & Liu, W., 2019. A comparative study on interlaminar properties of l-shaped two-dimensional (2d) and three-dimensional (3d) woven composites. Applied Composite Materials, 26, 723-744. Kim, J. K., Sham, M. L., 2000. Impact and delamination failure of woven-fabric composites. Composites Science and Technology, 60(5), 745-761. Martin, R. H., Jackson, W. C., 1993. Damage prediction in cross-plied curved composite laminates. In Composite Materials: Fatigue and Fracture, Fourth Volume. ASTM International. Sun, C. T., Kelly, S. R., 1988. Failure in composite angle structures part I: Initial failure. Journal of reinforced plastics and composites, 7(3), 220-232. Tasdemir, B., Coker, D., 2022. Fatigue and static damage in curved woven fabric carbon fiber reinforced polymer laminates. Journal of Composite Material, 56 , 1693-1708. Wang, Q., Li, T., Yang, X., Wang, K., Wang, B., & Ren, M., 2021. Prediction and compensation of process-induced distortions for L-shaped 3D woven composites. Composites Part A: Applied Science and Manufacturing, 141, 106211. Wimmer, G., Kitzmüller, W., Pinter, G., Wettemann, T., & Pettermann, H. E., 2009. Computational and experimental investigation of delamination in L-shaped laminated composite components. Engineering Fracture Mechanics, 76(18), 2810-2820.