In this study, the effect of change of notch type on non-linear buckling behavior in composite plates was investigated experimentally and numerically. The composite plate is produced by applying the vacuum infusion method using carbon and aramid hybrid woven fabric and epoxy. Primarily, in the composite plates, a circular hole in the middle, a U single edge notch and semicircle double edge notches are formed. The specimens were subjected to buckling tests, being placed on their two edges, while the others were free. Afterwards, the load displacement graphs of the plates under pressure load were obtained experimentally for the behavior before and after buckling. In the numerical study, non-linear buckling analysis was performed using the finite element method. As a result, experimental and numerical buckling behaviors were obtained in accordance with each other. Since the net cross section bearing the pressure load is equal for all notch types, an effective difference between the maximum damage loads has not been achieved. So, the variation of notch type does not change the load displacement behavior characteristics of the plates after buckling. However, due to the unsymmetrical geometry in U notched plates, an uneven change in horizontal displacements along the width of the plate was achieved. The maximum stress concentration formed around the notch increased after buckling with the increase of displacement in vertical direction.
Funding statement: This work was supported by the Scientific and Technical Research Council of Turkey (TUBITAK) under Grant No. 217M140 and was supported by Scientific Research Projects Coordination Unit of Firat University (FUBAP). Project number MF.16.43.
About the authors
Serkan Erdem received his BSc degree from the Department of Mechanical Engineering, Selcuk University, Konya, Turkey in 2006. He received his MSc and PhD degree from the Department of Mechanical Engineering, Firat University, Elazig, Turkey in 2013, and 2020, respectively. He is currently a postdoctoral researcher in the same department. His research interests include buckling, fiber reinforced composites, failure analysis, biomechanics.
Mustafa Gur received his BSc, MSc and PhD degrees from the Department of Mechanical Engineering, Firat University, Elazig, Turkey in 1985, 1989 and 1995, respectively. He is currently Assistant Professor in the same department. His research interests include solid mechanics, fiber reinforced composites and failure analysis.
Mete Onur Kaman received his BSc and MSc degrees from the Department of Mechanical Engineering, Firat University, Elazig, Turkey in 1999 and 2000, respectively. He received his PhD degree from the Department of Engineering Science, Middle East Technical University, Ankara, Turkey in 2006. He is currently Professor in the Department of Mechanical Engineering, Firat University, Elazig, Turkey. His research interests include fracture mechanics, fiber reinforced composites and failure analysis.
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