Buckling Analysis of Stitched and Unstitched Glass Epoxy Composites

Abstract:

In this paper, the effects of delamination on critical buckling load failure of unidirectional E-glass/epoxy composite laminated plate consisting of delamination at the middle of the mid plane were studied. Experimental work was carried out to determine the buckling load for rectangular composite plates consisting of delamination for various aspect ratios ranging from 0.5 to 3. Stitched and unstitched laminates were prepared by introducing inplane delamination at the mid of the mid plane using Teflon film. These specimens were made with unidirectional fiber of orientation of (0^o/-45^o/45^o/90^o)_s with single inplane delamination at the mid of the mid plane of through width and various lengths of 130 mm and 50 mm. The Plates were made to buckle experimentally by simply supporting the top and bottom edges, and sides were kept free. Buckling load has been found from the graph. The critical buckling load is found to be increased in the stitched laminates when compared with unstitched laminates and is decreased in both stitched and unstitched laminates as the aspect ratio increases. The experimental results were validated by using commercial finite element software of ANSYS.

• Periodical: Advanced Materials Research (Volume 337)
• Pages: 594-597
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.337.594
• Online since: September 2011
• Authors: R. Muruganandhan, Murali Vela
• Keywords: Aspect Ratio, Buckling, Composite, Delamination, Simple Supported End

References

[1] Zuleyha Aslan., Mustafa Sahin.,Buckling behavior and compressive failure of composite laminates containing multiple large delamination, composite structure(2008).

DOI: 10.1016/j.compstruct.2008.08.011

[2] Madhjusudhana, Parlapalli R.,Experimental investigation of delamination buckling of stitched composite laminates, composites part A (2007), Vol. 38;pp.2024-2033.

DOI: 10.1016/j.compositesa.2007.05.001

[3] Lonel Chirica,Studies on buckling of panels with initial deformation made of composite material,Elektronikus folyoirat (2008). ; pp.24-26

[4] Ionel Chirica, 2006, Numerical tests on the buckling of the plates made of composite materials, Romanian technical science academy, MOCM 12 (2006); Volume 3;pp.57-60.

[5] Pan, T.S. Local buckling of stitched composite laminate, Composite part B (1999), Vol. 30, pp.833-840.

DOI: 10.1016/s1359-8368(99)00047-5

[6] Hwang SF, Hung SM, Post buckling behavior of composite laminates with two delaminations under uniaxial compression. Composite structure (2005);Vol. 68; pp.157-165.

DOI: 10.1016/j.compstruct.2004.03.010