Analysis of the Effect of an Open Hole on the Buckling of a Compressed Composite Plate

Abstract

This paper investigates the effect of an open hole on the stability of a compressed laminated composite plate. The study was carried out in two ways: using experimental tests and numerical analysis. As a result of the experiment, the buckling form and path of the plate were recorded. The form of buckling was determined using the ARAMIS non-contact measurement system. The critical load value was determined from the working path using the approximation method. The experimental results were verified by numerical analysis based on the finite element method. FEM investigations were carried out in terms of a linear eigenproblem analysis. This allowed the bifurcation load and the corresponding buckling form of the numerical model of the plate to be determined. Investigating the effect of the hole in the compressed plate at a critical state showed high agreement between the proposed test methods. No clear effect of the hole size on the buckling of the plate was observed. In contrast, a clear effect of the hole on the critical load value was determined. The maximum decrease in the critical load value was 14%. The same decrease was observed for the stiffness of the post-critical characteristics. It was shown that the [45|−45|90|0]s composite plate had more than three times lower strength compared to [0|−45|45|90]s and [0|90|0|90]s. The novelty of this article is the development of a research methodology based on new interdisciplinary research methods for describing the influence of the central hole on the stability of compressed composite plates. The ABAQUS system was used for the numerical analysis.

Stability and Failure of Thin-Walled Composite Plate Elements with Asymmetric Configurations

“…This setup closely aligned with the freely supported boundary conditions assumed in the numerical analysis [56]. Testing on physical models of thin-walled elements, which were fabricated using the autoclave technique [57][58][59], facilitated the validation of the numerical model.…”

“…This setup closely aligned with the freely supported boundary conditions assumed in the numerical analysis [56]. Testing on physical models of thin-walled elements, which were fabricated using the autoclave technique [57][58][59], facilitated the validation of the numerical model. Experimental tests were conducted on composite samples, with the laminate ply configuration as previously described, at three distinct fiber orientations: 30 • , 45 • , and 60 • .…”

Study on the Mechanical Properties of a Carbon-Fiber/Glass-Fiber Hybrid Foam Sandwich Structure

“…Eyvazian et al [20] studied the buckling and crushing behavior of foam core mixed composite sandwich columns under edge compression load, analyzing the effects of panel thickness, laminate sequence configuration, aspect ratio, boundary conditions, and thickness resin pin on the specimen behavior. The study shows that using resin pins can change the unstable Euler buckling mode to a more stable progressive end crushing, significantly increasing the buckling load, improving the bearing capacity and energy absorption capacity of the sandwich structure, and the opening has a significant impact on the stability of the laminate under compressive load [21].…”