Experimental and numerical investigation of stiffener effects on buckling strength of composite laminates with circular cutout

Abstract

In the notched structures, to achieve maximum buckling resistance in comparison with structural weight, the optimal design of a stiffener is very important. In this research, after a review of the existing literature, nonlinear buckling behavior of composite plates containing the cutout with three different designs of stringer was investigated. The considered stiffeners are planer, longitudinal, and ring types. The buckling experiments were carried out on the stiffened plates containing a circular notch. Moreover, to achieve an efficient prediction of the buckling in the stiffened laminate with the hole, a finite strip method is developed based on the Airy stress function and von Karman’s large deformation equations. Studies show that there is a good agreement between the postbuckling behaviors derived from developed finite strip method with experimental results. Fast convergence of the considered finite strip method compared with the finite element results shows its efficiency for prediction of buckling behavior in laminated composites. The results show that the buckling load-bearing capacities of perforated plates with a longitudinal and planer stiffener are higher compared with the other stiffener, respectively. The detailed parametric study on the effects of thickness of the plate and stiffener and opening diameter on buckling behavior was performed using experiments and modeling.

A Numerical Study of the Effect of Component Dimensions on the Critical Buckling Load of a GFRP Composite Strut under Uniaxial Compression

“…This was illustrated using the inflection points at which the internal bending moments were zero and the curvature of the structure changed its sign. It showed the possible buckling failure location on the structure such that designers can propose an appropriate solution for strengthening the structure by using stiffeners or other methods [36,37]. Thus, the first buckling mode shape of the strut corresponding to different κ values was investigated and is illustrated in Table 4.…”

Buckling performance of co‐cured and stiffened composite structure with embedded multilayer damping membranes

“…Mo et al [27] combined finite element numerical simulation and experimental research to investigate the buckling and post-buckling performance of composite stiffened plates, and analyzed the influence of the thickness of the skin layer and the distance between the ribs on the buckling and post-buckling performance of the structure. Shojaee et al [28] used the finite element method to study the buckling performance of composite thin-walled stiffened plates with openings, and analyzed the influence of rib height and opening diameter on the buckling performance. Motezaker et al [29] solved the natural frequency, critical buckling load, and structural deflection of the annular nanoplate based on the layering theory and the Hamiltonian principle, and compared with the results of published literature to verify the correctness of the theoretical method.…”

Buckling characteristics of cut-out borne composite stiffened hyperbolic paraboloid shell panel

“…Mouhat et al 49 used nonlinear finite element modeling to consider the effect of ply orientation on nonlinear buckling of composite stiffened panel. Shojaee et al 50 investigated stiffener effect on buckling strength of composite laminates with circular cutout. Atilla et al 51 studied the effect of size, number and location of the circular cut-out on buckling loads of laminated composite plates using commercial software ANSYS.…”