Open Access Open Access  Restricted Access Subscription or Fee Access

Effects of ply sequence of adjacent plies on the determination of delamination fracture toughness in carbon/epoxy composites

Ashok Kumar Prodduturi, Ravinder Reddy Pinninti, Gupta AVSSKS


The influence of ply sequence on the resistance to delamination fracture of composite laminates can be determined by Double Cantilever Beam (DCB) tests. However, to observe only the effect of delamination interface on the toughness value, both the global and local effects due to ply sequence should be uncoupled. The present work uses four DCB specimens prepared from carbon/epoxy fabric with different stacking sequences by maintaining same global elastic properties. The measured GIc values are higher than that of unidirectional laminates due to fiber bridging occurred between θ - oriented plies.
This paper presents an experimental study on the interlaminar fracture toughness in Mode I of each lay-up under quasi-static condition. Experimental results show that the measured Mode I interlaminar fracture toughness in terms of critical strain energy release rate, GIc at the crack initiation increases with both adjacent and sub-adjacent ply angles. The R-curve plateau values increases with the ply angle of adjacent plies

Full Text:



Whitney JM., Browning CE, Hoogsteden W, (1982) A Double Cantilever Beam Test for Characterizing Mode I Delamination of Composite Materials. J Reinf Plast Compos, 1: 297

O’Brien TK, (1984) Mixed-mode strain-energy release rate effects on edge delamination of composites. Effects of defects in composite materials. ASTM STP, 836:125–142.

O'Brien, TK., (1982) Characterization of Delamination Onset and Growth in a Composite Laminate, Damage in Composite Materials, ASTM STP 775: 140-167.

ASTM D 5528-13,(2013) Standard test method for mode I interlaminar fracture toughness of unidirectional fiber-reinforced polymer matrix composites. In: Annual Book of ASTM Standards, 30.06, American Society for Testing Materials.

ISO 15024, (2001) Fibre-reinforced plastic composites Determination of mode I interlaminar fracture toughness, GIC, for unidirectionally reinforced materials. International organization of standardization, Geneva, Switzerland, 24

Brunner AJ, Blackman BRK, Davies P, (2008) A status report on delamination resistance testing of polymer-matrix composites. Eng Fract Mech, 75(9): 2779-2794.

Winkins DJ, Eisenmann JR, Camin RS, Margolis WS, Benson RA, (1982) Characterising Delamination growth in graphite-epoxy. Damage in Composite Materials ASTM STP 775: 168-83.

Choi H, (1984) The characterization of mode I delamination failure in non-woven multidirectional laminates. Compos 15: 277-90.

de Morais AB, de Moura MF, Marques AT, de Castro PT, (2002) Mode I interlaminar fracture of carbon/epoxy cross-ply composites. Compos Sci Technol, 62: 679-686.

Pereira AB, de Morais AB,(2004) Mode I interlaminar fracture of carbon/epoxy multidirectional laminates. Compos Sci Technol , 64:2261-70.

Bin Mohamed Rehan MS, Rousseau J, Fontaine S, Gong XJ, (2017) Experimental study of the influence of ply orientation on DCB mode-I delamination behavior by using multidirectional fully isotropic carbon/epoxy laminates, Compos Struct, 161: 1-7

Davdson BD, Schapery RA, (1988) Effect of finite width on deflection and energy release rete of an orthotropic double cantilever specimen. J Compos Mater, 22:640-56.

Gong XJ, Hurez A, Verchery, (2010) On the determination of delamination toughness by using multidirectional DCB specimens. Polym Test, 29(6):658-666.

Benzeggagh ML, Gong XJ, Laksimi A, Roelandt JM, (1991) On the test of mode I delamination and the importance of stratification. Polym Eng Sci, 31(17): 1286-1292.

Choi NS, Kinloch AJ, Williams JG, (1999) Delamination fracture of multidirectional carbon –fiber/epoxy composites under mode I, mode II and mixed mode I/I loading. J Compos Mater, 33(1):73-100.

Hiley MJ, (2000) Delamination between multi-directional ply interfaces in carbon-epoxy composites under static and fatigue loading, in European Structural Integrity Society, J.G. Williams and A. Pavan, Editors. Elsevier. 61-72.

Robinson P, Song DQ, (1992) A modified DCB specimen for Mode I testing of multidirectional laminates. J Compos Mater, 26: 1554-77.

Ashok Kumar P, Ravinder Reddy P, Sharath Chandra N, Gupta AVSSKS, (2009)“Investigation of Stress Intensity Factor for a Plate with Hole Using FEA,” Int J Theor Appl Mech, 4(2): 223-233.


  • There are currently no refbacks.