caa a22 4500 465751016 CHVBK 20180323111833.0 cr unu---uuuuu 170327e19901201xx s 000 0 eng 10.1007/BF02321505 doi (NATIONALLICENCE)springer-10.1007/BF02321505 Fatigue damage in centrally notched GR/EP laminates [Elektronische Daten] [M. Jen, J. Hsu, C. Lee] The fatigue properties of graphite/epoxy (Gr/Ep) T300/5208 composite laminates of 16 plies with a central circular hole subjected to tension-tension (T-T) constant-stress amplitudes at room temperature and low humidity have been fully investigated. Studied are four types of notched laminates which are classified as unidirectional, off-axis, orthotropic shear and quasi-isotropic. Some of them were precracked to initiate and guide the crack growth transversely. Our work is experimental and the analysis is based on a semiempirical approach. We have experimentally measured S-N curves, failure surfaces, crack lengths and their corresponding growth directions, delamination areas and transverse delamination lengths for the above series of composites. The fatigue failure mechanism was observed and expressed schematically. To analyze the experimental results, we have categorized the S-N curves by three common equations. The effective transverse crack length of quasi-isotropic laminates was found to be independent of the applied stress. For simplicity, it was modeled by a power law of applied cycles. It was also found that the delamination area could be expressed by a power law of applied cycles. Hence, the so-called modified Paris law, i.e., the power law of cycles, proposed here has been verified as satisfactorily acceptable. Society for Experimental Mechanics, Inc., 1990 Jen M. Department of Mechanical Engineering, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan aut Hsu J. Department of Mechanical Engineering, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan aut Lee C. Department of Mechanical Engineering, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan aut Experimental Mechanics Kluwer Academic Publishers 30/4(1990-12-01), 360-366 0014-4851 30:4<360 1990 30 11340 https://doi.org/10.1007/BF02321505 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02321505 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jen M. Department of Mechanical Engineering, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan aut NATIONALLICENCE 700 1- Hsu J. Department of Mechanical Engineering, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan aut NATIONALLICENCE 700 1- Lee C. Department of Mechanical Engineering, National Sun Yat-Sen University, 80424, Kaohsiung, Taiwan aut NATIONALLICENCE 773 0- Experimental Mechanics Kluwer Academic Publishers 30/4(1990-12-01), 360-366 0014-4851 30:4<360 1990 30 11340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer