Mechanical Behavior of Laminated Composites with Circular Holes

Abstract:

This paper presents a numerical method for the evaluation of the stress concentration factor (SCF) in three dimensional laminated composites under mechanical loads. The proposed method uses the finite element formulation. The composites materials based on the epoxy matrix and reinforcing fibers are extensively used in aircraft structures due to their high specific characteristics. However, the withstanding of composite structures can be significantly reduced by the addition of geometric singularities, such as perforations or notches. To Analyses the stress concentration around geometrical notches, several studies as analytical, numerical and experimental techniques are available. The stress distribution in a laminated composite plate with the presence of a circular hole was investigated using the finite element method. In order, the results obtained by this study are compared with those reported in literature. The aim of this analysis is to evaluate numerically the factor of stress concentration under the influence of several parameters such as fibers orientation, the mechanical characteristics of composites and the distance between notches of cross-laminated.

• Periodical: Key Engineering Materials (Volume 550)
• Pages: 1-8
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.550.1
• Online since: April 2013
• Authors: Habib Achache, Benali Boutabout, Djamel Ouinas
• Keywords: Fibers Orientation, Finite Element Method (FEM), Laminates, Notches, Stress Concentration Factor

References

[1] T. K. Paul and K. M. Rao, Flexural Analysis of Laminated Composite Plates Containing two Elliptical Holes Using Higher-Order Shear Deformation Theory. Computers & Structures Vol. 55. No. 2. pp.279-285. (1995)

DOI: 10.1016/0045-7949(94)00443-7

[2] N.T. Younis, Assembly stress for the reduction of stress concentration, Mechanics Research Communications 33 (2006) 837–845

DOI: 10.1016/j.mechrescom.2006.03.007

[3] Xu Xiwu, Sun Liangxin and Fan N Xuqi, Stress Concentration of Finite Composite Laminates Weakened by Multiple Elliptical Holes. Inr. J. Solids Structures Vol. 32, No. 20, pp.3001-3014, (1995)

DOI: 10.1016/0020-7683(94)00301-c

[4] Paul TK, Rao KM. Finite element evaluation of stress concentration factor of thick laminated plates under transverse loading. Computers and Structures (1993)

DOI: 10.1016/0045-7949(93)90423-b

[5] K. Ting, K.T. Chen, W.S. Yang, Stress analysis of the multiple circular holes with the rhombic array using alternating method, International Journal of Pressure Vessels and Piping 76 (1999) 503–514

DOI: 10.1016/s0308-0161(99)00022-8

[6] L. Toubal, M. Karama, B. Lorrain, Composite Structures 68 (2005) 31–36

[7] H. Mahiou, A. Bekaou, Composites Science and Technology 57 (1997) 1661–1672.

[8] ABAQUS Finite Element Program, ABAQUS/Standard 6.7.1. Hibbit, Karlsson and Sorensen, Inc. Pawtuket, USA, 2006.