OJCM  Vol.7 No.1 , January 2017
Fatigue Behavior of Open-Holed CFRP Laminates with Initially Cut Fibers
Carbon fiber-reinforced plastic (CFRP) laminates with initially cut fibers (ICFs) have good formability without large degradation of static strength; however, their fatigue behavior has not been investigated thus far. In this paper, we investigated fatigue behavior and damage progress of open-holed CFRP laminates with ICFs having interlayers. Three types of CFRP laminates were employed: a laminate without ICF fabricated using an autoclave (Continuous-A), a laminate with ICF fabricated using an autoclave (ICF-A) and a laminate with ICF fabricated using press molding (ICF-P). First, fatigue test was conducted to obtain S (maximum stress)-N (the number of cycles to failure) curves in order to reveal fatigue strength. The fatigue tests for several specimens were interrupted at three prescribed numbers of cycles to observe damage progress. It is found that the Continuous-A laminate shows little strength degradation in the S-N curve while fatigue strength in both ICF laminates is decreased by approximately 30% at N of 106. In contrast, the damage progress of the ICF-P laminate is the least among the three laminates while the delamination progress at both edges and around the hole in the Continuous-A laminate is the most prominent.
Cite this paper: Sudarsono, S. , Ogi, K. (2017) Fatigue Behavior of Open-Holed CFRP Laminates with Initially Cut Fibers. Open Journal of Composite Materials, 7, 49-62. doi: 10.4236/ojcm.2017.71003.

[1]   Taketa, I., Okabe, T. and Kitano, A. (2008) A New Compression-Molding Approach Using Unidirectionally Arrayed Chopped Strands. Composites: Part A, 42, 1884-1890.

[2]   Taketa, I., Okabe, T. and Kitano, A. (2009) Strength Improvement in Unidirectional Arrayed Chopped Strands with Interlaminar Toughening. Composites: Part A, 40, 1174-1178.

[3]   Yashiro, S. and Ogi, K. (2009) Fracture Behavior in CFRP Cross-Ply Laminates with Initially Cut Fibers. Composites: Part A, 40, 938-947.

[4]   Taketa, I., Sato, N., Kitano, A., Nishikawa, M. and Okabe, T. (2010) Enhancement of Strength and Uniformity in Unidirectionally Arrayed Chopped Strands with Angled Slits. Composites: Part A, 41, 1639-1646.

[5]   Taketa, I., Okabe, H., Matsutani, H. and Kitano, A. (2011) Flowability of Unidirectionally Arrayed Chopped Strands in Compression Molding. Composites: Part B, 42, 1764-1769.

[6]   Li, H., Wang, W.X., Takao, Y. and Matsubara, T. (2013) New Designs of Unidirectionally Arrayed Chopped Strands by Introducing Discontinuous Angled Slits into Prepreg. Composites: Part A, 45, 127-133.

[7]   Li, H., Wang, W.X. and Matsubara, T. (2014) Multiscale Analysis of Damage Progression in Newly Designed UACS Laminates. Composites: Part A, 57, 108-117.

[8]   O’Higgins, R.M., McCarthy, M.A. and McCarthy, C.T. (2008) Comparison of Open Hole Tension Characteristics of High Strength Glass and Carbon Fibre-Reinforced Composite Materials. Composites Science and Technology, 68, 2770-2778.

[9]   Mall, S., Katwyk, D.W., Bolick, R.L., Kelkar, A.D. and Davis, D.C. (2009) Tension-Compression Fatigue Behavior of a HVARTM Manufactured Unnotched and Notched Carbon/ Epoxy Composite. Composite Structures, 90, 201-207.

[10]   Yashiro, S. and Okabe, T. (2011) Estimation of Fatigue Damage in Holed Composite Laminates Using an Embedded FBG Sensor. Composites: Part A, 42, 1962-1969.

[11]   Kawai, M. and Shiratsuchi, T. (2012) Vanishing Notch Sensitivity Approach to Fatigue Life Prediction of Notched Cross-Ply CFRP Laminates at Room Temperature. Journal of Composites Materials, 46, 2935-2950.

[12]   Fujita, Y., Matsutani, H., Kawamoto, S., Takehara, T. and Taketa, I. (2014) Mechanical Property and Flowability of Quasi-Isotropic UACS Laminates. Proceedings of the 16th European Conference on Composite Materials, Seville, 22-26 June 2004.