Failure Analysis of Composites Plate with Central Opening Hole Subject to Arbitrary Tension Load

The most practical composite structure contains holes as parts of the basic design, such hole cause high-stress gradients. The understanding of the effect of the cutout on the failure criteria of such composite plates is very important in the design of structures. This paper is focused on the investigation of the failure loads around a hole in the composite plate (E-glass/ Epoxy) under the effect of various factors such as fiber volume fraction, loading angle, aspect ratio and fiber orientation. To achieve the objective, two techniques are used I- Analytical, the generalized formulation thus obtained is coded and analytical results are obtained by using MATLAB ver.17 was developed to implement Lekhnitskii’s solution. II-Numerical, the simulation model was developed using finite element software, ANSYS 17.2 was used for analysis purpose. In this work, an experimental test procedure was design and implemented to estimate the strength parameter for composite plate in which used these parameters in the analysis. Based on the results presented hither, the failure index of a composite plate can be safely changed by utilize suitable material properties (𝜈𝜈𝑓𝑓 ≥ 0.3), fiber orientation (θ ≤ 45°) and aspect ratio (a/b ≥ 1.5). In general, it can be stated that the failure index becomes more severe as the aspect ratio of the ellipse becomes more pronounced. To validate the approach the numerical results by using the finite element technique are compared with the predictions of the analytical models, the results show good agreement.