PSI - Issue 2_A

Ido Simon et al. / Procedia Structural Integrity 2 (2016) 205–212

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8 I. Simon et al. / Structural Integrity Procedia 00 (2016) 000–000 In addition, if a ”no growth” design law is to be followed, it is suggested here that ∆ G Ie f f thr may be used. While G Imax thr is dependent on R P , it is proposed here that ∆ G Ie f f thr is a constant depending only on the material and layup. Another four tests for measuring the delamination propagation rate da / dN under constant amplitude fatigue cycles are being conducted on an additional four DCB specimens. The fatigue tests are being carried out using the same four cyclic displacement ratios as in the earlier tests, namely R d = 0.1, 0.33, 0.5 and 0.75. Repeatability of these tests will be examined. ASTMStandard D 6115-97 (reapproved 2011). Test method for m ode I fatigue delamination growth onset of unidirectional fi ber-reinforced polymer matrix composites. Space Simulation; Aerospace and Aircraft; Composite Materials, Vol. 15.03, American Society for T esting and Materials, West Conshohocken, PA, pp. 343–348 (2011). Banks-Sills, L., Ishbir, C., Fourman, V., Rogel, L. and Eliasi, R. Interface fracture toughness of a multi-directional woven composite. Int. J. Fract. 182: 187-207 (2013). Bathe, K.J. ADINA–Automatic Dynamic Incremental Nonlinear Analysis, Version 8.6.0, ADINA R&D, Inc. Watertown, MA (2009). Bolotin, V.V. Delaminations in composite structures: its origin, buckling, growth and stability. Compos. Part B 27: 129-145 (1996). Brunner, A.J., Murphy, N., and Pinter, G. Development of a standardized procedure for the characterization of interlaminar delamination propaga tion in advanced composites under fatigue mode I loading conditions. Eng. Fract. Mech. 76: 2678-2689 (2009). Ishbir, C., Banks-Sills, L., Fourman, V. and Eliasi, R. Delamination propagation in a multi-directional woven composite DCB specimen subjected to fatigue loading. Compos. Part B 66: 180-189 (2014). Jones, R., Stelzer, S. and Brunner, A.J. Mode I, II and mixed mode I / II delamination growth in composites. Compos. Struct. 110: 317–324 (2014). Jones, R., Hu, W. and Kinloch, A.J. A convenint way to represent fatigue crack growth in structural adhesives. Fatigue Fract. Eng. Mater. Struct. 38: 379–391 (2014). Martin, R. H. and Murri, G. B. Characterization of mode I and mode II delamination growth and thresholds in AS4 / PEEK composites. In: Composite Materials: Testing and Design. ASTM STP 1059, Garbo, S.P. (ed.) American Society for Testing and Materials, Philadelphia, PA, pp. 251-270 (1990). Raju, I.S. Fracture mechanics concepts, stress fields, stra in energy release rates, delamination initiation and growth criteria. In: Delamination Behaviour of Composites. Sridharan, S. (ed.) Woodhead Publishing Ltd., Cambridge, England, pp. 3–27 (2008). Rasband, W.S. ImageJ. U.S. National Institutes of Health, Bethesda, Maryland, USA, http: // imagej.nih.gov / ij / , 1997-2014 (accessed January, 2015). Stelzer, S., Brunner, A.J., Argu¨elles, A., Murphy, N., Cano, G.M. and Pinter, G. Mode I delamination fatigue crack grow th in unidirectional fiber reinforced composites: results from ESIS TC4 round-robins. Eng. Fract. Mech. 116: 92-107 (2014). References