OJCM  Vol.9 No.4 , October 2019
Relationship between the Initial Fracture Stress and Fatigue Limit—Simple Prediction Method of Tensile Fatigue Limit of Composite
Abstract: This article presents an experimental study that clarifies the relationship between the initial fracture stress and fatigue limit of glass fiber reinforced unsaturated polyester resin specimens with a laminated structure taken from a pultruded square pipe. Quasi-static bending and tension tests are performed with acoustic emission (AE) measurements to identifying the occurrence of initial fracture during testing. AE and observation results have clarified the occurrence of initial fracture was detected by maximum acoustic energy values and corresponding fiber breakage in the unidirectional (UD) bundles. Moreover, the ratio of initial fracture stress to ultimate strength is 32% in bending and 26% in tension, when comparing stress and strains on the tension side of the UD layer. These values are in good agreement with each other and with the measured tensile fatigue limit when the cyclic stress is at 25% of the tensile strength. Initial fracture stress obtained by static tests is close values to the fatigue limit which will greatly contribute to the prediction of the fatigue limit.
Cite this paper: Imai, Y. , Nishitani, K. , Fortin, G. , Ohtani, A. and Hamada, H. (2019) Relationship between the Initial Fracture Stress and Fatigue Limit—Simple Prediction Method of Tensile Fatigue Limit of Composite. Open Journal of Composite Materials, 9, 338-354. doi: 10.4236/ojcm.2019.94021.

[1]   Hannappel, R. (2017) The Impact of Global Warming on the Automotive Industry. AIP Conference Proceedings, 1871, Article ID: 060001.

[2]   Mamalis, A.G. and Spentaz, K.N. (2013) The Impact of Automotive Industry and Its Supply Chain to Climate Change; Somme Techno-Economic Aspects. European Transport Research Review, 5, 1-10.

[3]   Ishikawa, T. (2015) Overview of Carbon Fiber Reinforced Composites (CFRP) Applications to Automotive Structural Parts, Focused on Thermoplastic CFRP. Journal of the Japan Society for Precision Engineering, 81, 489-493.

[4]   Turner, T.A., Harper, L.T., Warrior, N.A. and Rudd, C.D. (2008) Low-Cost Carbon-Fibre-Based Automotive Body Panel Systems: A Performance and Manufacturing Cost Comparison. Proceedings of the Institution of Mechanical Engineers Part D: Automobile Engineering, 222, 53-63.

[5]   Friedrich, K. and Almajid, A. (2012) Manufacturing Aspects of Advanced Polymer Composites. Applied Composite Materials, 20, 107-128.

[6]   Czél, G., Jalalvand, M. and Wisnom, M.R. (2016) Design and Characterization Advanced Pseudo-Ductile Unidirectional Thin-Ply Carbon/Epoxy-Glass/Epoxy Hybrid Composites. Composite Structures, 143, 362-370.

[7]   Pandita, S.D., Huysmans, G., Wevers, M. and Verpoest, I. (2001) Tensile Fatigue Behavior of Glass Plain-Weave Fabric Composites in On- and Off-Axis Directions. Composites Part A, 32, 1533-1539.

[8]   Padmaraj, M.H., Vijaya, K.M. and Dayananda, P. (2019) Experimental Study on the Tension-Tension Fatigue Behavior of Glass/Epoxy Quasi-Isotropic Composites. Journal of King Saud University—Engineering Science.

[9]   Echtermayer, A.T., Engh, B. and Buene, L. (1995) Lifetime and Young’s Modulus Changes of Glass/Phenolic and Glass/Polyester Composites under Fatigue. Composites, 26, 10-16.

[10]   Kenane, M. and Benzeggagh, M.L. (1997) Mixed-Mode Delamination Fracture Toughness of Unidirectional Glass/Epoxy Composites under Fatigue Loading. Composites Science and Technology, 57, 597-605.

[11]   Feng, H. and Yi, W. (2017) Propagation Characteristics of Acoustic Emission Wave in Reinforced Concrete. Results in Physics, 7, 3815-3819.

[12]   Fotouhi, M., Fragassa, C., Fotouhi, S., Saghafi, H. and Minak, G. (2019) Damage Characterization of Nano-Interleaved CFRP under Static and Fatigue Loading. Fibers, 7, 13.

[13]   Aggelis, D.G. (2011) Classification of Cracking Mode in Concrete by Acoustic Emission Parameters. Mechanics Research Communications, 38, 153-157.

[14]   Arumugam, V., Kumar, C.S., Santulli, C., Sarasini, F. and Stanley, A.J. (2011) A Global Method for the Identification of Failure Modes in Fiberglass Using Acoustic Emission. Journal of Testing and Evaluation, 39, 954-966.

[15]   Imai, Y., Fortin, G., Pinpathomrat, B., Nishitani, K., Memon, A., Yang, Y., Ohtani, A. and Hamada, H. (2019) Quasi-Static Flexural Properties of a Pultruded Glass Fiber/Unsaturated Polyester Square Pipe. Open Journal of Composite Material, 9, 271-284.

[16]   Qiao, P. and Yang, M. (2006) Fatigue Life Prediction of Pultruded E-Glass/Polyurethane Composites. Journal of Composite Materials, 40, 815-837.

[17]   Liang, S., Gning, P.B. and Guillaumat, L. (2012) A Comparative Study of Fatigue Behavior of Flax/Epoxy and Glass/Epoxy Composites. Composites Science and Technology, 72, 535-543.

[18]   Fotouhi, M., Suwarta, P., Jalavand, M, Czel, G. and Wisnom, M. (2016) Detection of Fibre Fracture and Ply Fragmentation in Thin-Ply UD Carbon/Glass Hybrid Laminates Using Acoustic Emission. Composites: Part A, 86, 66-76.

[19]   Cao, X. and Lee, J. (2003) Control of Shrinkage and Final Conversion of Vinyl Ester Resins Cured in Low-Temperature Molding Process. Journal of Applied Polymer Science, 90, 1486-1496.