Compressive Behavior of a Glass/Epoxy Composite Laminates with Single Delamination

Document Type: Research Paper


Department of Mechanical Engineering, University of Kashan


The buckling and postbuckling behaviors of a composite beam with single delamination are investigated. A three-dimensional finite element model using the commercial code ANSYS is employed for this purpose. The finite elements analyses have been performed using a linear buckling model based on the solution of the eigenvalues problem, and a non-linear one based on an incremental-iterative method. The large displacements have been taken into account in the nonlinear analysis. Instead of contact elements a new delamination closure device using rigid compression-only beam elements is developed. Effect of delamination length, position through thickness and stacking sequence of the plies on the buckling and postbuckling of laminates is investigated. It has been found that significant decreases occur in the critical buckling loads after a certain value of the delamination length. The position of delamination and the fiber orientation also affect these loads.


[1] Kachanov L.M., 1976, Separation of composite materials, Mechanika Polimerov 5: 918-922.

[2] Chai H., Babcock C.D., Knauss W.G., 1981, One-dimensional modeling of failure in laminated plates by delamination buckling, International Journal of Solids and Structures 17:1069-1083.

[3] Wang S.S., Zahlan N.M., Suemasu H., 1985, Compressive stability of delaminated random short fiber composites: Part I-Modeling and method of analysis, Journal of Composite Materials 19(4): 296-316.

[4] Wang S.S., Zahlan N.M., Suemasu H., 1985, Compressive stability of delaminated random short fiber composites: Part II- Experimental and analytical results, Journal of Composite Materials 19(4): 317-333.

[5] Vizzini A.J., Lagace P.A., 1987, The buckling of a delaminated sublaminate on an elastic foundation, Journal of Composite Materials 21: 1106-1117.

[6] Kutlu Z., Chang F.K., 1992, Modeling compression failure of laminated composites containing multiple through-width delaminations, Journal of Composite Materials 26: 350-387.

[7] Wang J.T., Cheng S.H., Lin C.C., 1995, Local buckling of delaminated beams and plates using continuous analysis, Journal of Composite Materials 29: 1374-1402.

[8] Hwang S.F., Mao C.P., 1999, The delamination buckling of single-fiber system and interply hybrid composites, Composite Structures 46: 279-287.

[9] Zor M., 2003, Delamination width effect on buckling loads of simply supported woven-fabric laminated composite plates made of carbon/epoxy, Journal of Reinforced Plastics and Composites 22: 1535-1546.

[10] Zor M., Sen F., Toygar M.E., 2005, An investigation of square delamination effects on the buckling behavior of laminated composite plates with a square hole by using three-dimensional FEM analysis, Journal of Reinforced Plastics and Composites 24(11): 1119-1130.

[11] Arman Y., Zor M., Aksoy S., 2006, Determination of critical delamination diameter of laminated composite plates under buckling loads, Composite Science and Technology 66(15): 2945-2953.

[12] ANSYS 9, Theory Reference.

[13] Southwell R.V., 1932, On the analysis of experimental observations in problems of elastic stability, in: Proceedings of the Royal Society of London 135: 601-616.