Back
 OJCM  Vol.8 No.3 , July 2018
Effect of Needle Punching Process on a Chopped Strand Mat Composite with an Open Hole
Abstract: The easiest and most reliable joining method is the mechanical joint with a bolt and nut or rivet. However, in the case of composite laminates, mechanical joint properties decrease because of lower interlaminar properties compared to in-plane properties around hole. This study investigated needle punching process with the aim of improving the mechanical properties in the thickness direction of fiber-reinforced plastic composite laminates with an open hole. Needle punching process was applied to glass fiber chopped strand matused as the reinforcement for the composite laminates. Open-hole tensile tests and observations of end cross-sections after the tests were performed. The tensile properties and fracture mechanism of the specimens subjected to needle punching process were investigated. In addition, characteristic distance (a parameter for evaluating resistance to fracture in open-hole tensile test specimens) was also calculated to examine the effects of needle punching process conditions on fracture toughness. Tensile strength was improved by more than 15% by needle punching process. However, when a certain needle punching density was exceeded, the mechanical properties worsened. In addition, characteristic distance increased with increasing needle punching density. Thus, these results suggest that there is an optimal needle punching density with respect to strength and characteristic distance.
Cite this paper: Ichikawa, D. , Hamada, H. and Ohtani, A. (2018) Effect of Needle Punching Process on a Chopped Strand Mat Composite with an Open Hole. Open Journal of Composite Materials, 8, 110-123. doi: 10.4236/ojcm.2018.83009.
References

[1]   Yamaguchi, Y. (1996) Joining Fiber Reinforced Plastics. Journal of the Japan Welding Society, 65, 463-468.
https://doi.org/10.2207/qjjws1943.65.6_463

[2]   Fukuda, H., Ben, G. and Suemasu, H. (2011) Compendium of Composite Materials and Technology. New Edition, 404-417.

[3]   Sato, C. (2014) Adhesive Bonding for FRP. Journal of the Adhesion Society of Japan, 50, 175-178.
https://doi.org/10.11618/adhesion.50.175

[4]   Hatta, H., Kougo, Y., Asano, T. and Sawada, Y. (1997) Pin Joint Strength of C/C Composites. Transactions of the Japan Society of Mechanical Engineers Series A, 63, 1586-1593.
https://doi.org/10.1299/kikaia.63.1586

[5]   Nojima, T. and Kusaka, T. (1997) Fracture Behaviors of CFRP Laminates in Mode I Interlaminar Fracture Toughness Testing. Transactions of the Japan Society of Mechanical Engineers Series A, 63, 879-885.
https://doi.org/10.1299/kikaia.63.879

[6]   Iwahori, Y. and Ishikawa, T. (2014) Impact Damage to Laminar Reinforced Composite Materials. The Proceeding of the Materials and Processing Conference, Hiroshima, 13 November 2014, 185-186.

[7]   Yamauchi, Y., Kurokawa, T. and Kusaka, T. (1993) Estimation of Dynamic Interlaminar Fracture Toughness of CFRP by ENF Test Using SHPB Method. Journal of the Society of Materials Science, 42, 1445-1451.
https://doi.org/10.2472/jsms.42.1445

[8]   Arai, M., Hirokawa, J., Hanamura, Y., Ito, H., Hojo, M. and Quaresimin, M. (2014) Characteristic of ModeⅠFatigue Crack Propagation of CFRP Laminates Toughened with CNF Interlayer. Composites Part B, 65, 26-33.
https://doi.org/10.1016/j.compositesb.2014.02.025

[9]   Kusaka, T., Kurokawa, T. and Yamauchi, Y. (1994) Strain Rate Dependence of Mode II Interlaminar Fracture Toughness of Unidirectional CF/Epoxy Composite Laminates. Journal of the Society of Materials Science, 43, 445-450.
https://doi.org/10.2472/jsms.43.445

[10]   Zhang, Z., Hazemoto, M., Yang, Y. and Hamada, H. (2013) Fracture Analysis of Needle Punched Nonwoven Composite with Open Holes. Proceedings of the 19th International Conference on Composite Materials (ICCM), Montreal, 28 July-2 August 2013, 8458-8466.

[11]   Lee, S. and Kang, T. (2000) Mechanical and Impact Properties of Needle Punched Nonwoven Composites. Journal of Composite Materials, 34, 816-840.
https://doi.org/10.1177/002199830003401001

[12]   Nuismer, R. and Labor, J. (1978) Applications of the Average Stress Failure Criterion: Part I-Tension. Journal of Composite Materials, 12, 238-249.
https://doi.org/10.1177/002199837801200302

[13]   Nuismer, R. and Labor, J. (1978) Applications of the Average Stress Failure Criterion: Part II-Compression. Journal of Composite Materials, 13, 49-60.
https://doi.org/10.1177/002199837901300104

[14]   Miura, Y. (1985) Non-Woven Fabrics. Kobunshikankokai, Kyoto, 56-57.

[15]   Ichikawa, D., Marui, R., Morii, T. and Ohtani, A. (2015) Static and Dynamic Properties of Needle Punched Chopped Strand Mats Composite with Open Hole. Proceedings of the 20th International Conference on Composite Materials (ICCM-20), Copenhagen, 19-24 July 2015, 1-10.

[16]   Whitney, J. and Nuismer, R. (1974) Stress Fracture Criteria for Laminated Composites Containing Stress Concentrations. Journal of Composite Materials, 8, 253-265.
https://doi.org/10.1177/002199837400800303

[17]   Ichikawa, D., Marui, R., Morii, T. and Ohtani, A. (2017) Effect of Needle Punching Process on Fatigue and Residual Properties of Chopped Strand Mat Composites. Proceedings of the 2017 International Conference on Materials & Processing (ICMP2017), Los Angeles, 4 June 2017, 1-7.

[18]   Ichikawa, D., Morii, T., Hamada, H. and Ohtani, A. (2018) Effect on Residual Strength Properties of Needle Punched Chopped Strand Mat Composites. Mechanical Engineering Journal, 5, 1-9.
https://doi.org/10.1299/mej.17-00445

 
 
Top