The current study attempted to evaluate the impact of drilling parameters and delamination on the bearing strength of both neat GFRP (NG) and hybrid GFRP/aluminum (Al)-wire mesh with two various configurations, first with Al-mesh in the outer surface of specimen (AG) and the other with Al-mesh in the core of specimen (GA). Drilling procedure is carried out using $$\varnothing$$
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6 mm carbide twist drill with three different tip angles (90°, 120° and 135°), as well as Three different speeds and feeds (1000, 2000, and 3000 rpm) and (20, 40, and 60 mm/min), respectively. Taguchi and ANOVA analyses are used to analyze the influence of processing parameters. The findings showed that AG specimen experienced the least delamination damage. The maximum bearing strength refers to NG specimen, which is 9.6% and 8.7% more than AG and GA specimens, respectively. Drill point angle has the major effect on bearing strength for both AG and GA specimens, while for NG feed rate is of the major effect. The developed regression model displayed a high level of fitness with an average prediction error of less than 3%.
The analytical approach is presented for both symmetric and anti-symmetric local buckling of the thin-plate in finite sizes and with a center crack under tension. An efficient classical solution based on the principle of minimum total potential energy was provided using only 2 and 1 degrees of freedom for symmetric and anti-symmetric modes and the linear elastic buckling loads are evaluated by the means of RayleighRitz method. In the pre-buckling state, a correction factor for the peak compressive stress in the finite cracked plates is defined with an empirical formula and used in the analytical solution of the buckling. To verify the analytical approach, a wide range of numerical results by aid of finite element method are provided herein and a comparison between theoretical results with the experimental work of other researchers has been done. Both numerical and experimental results accept the accuracy and validity of the presented analytical model.
KeywordsCracked plate; tension; linear elastic buckling; RayleighRitz method.An efficient analytical model to evaluate the first two local buckling modes of finite cracked plate under tension
INTRODUCTIONIn a cracked plate subjected to the tension load, perpendicular to the crack orientation, the developed compressive stress near the crack leads to buckling of crack edges. This phenomenon which can be called as local buckling of cracked plates under tension, has been studied by numerous researchers.The early works were the experimental studies such as the Air Force Flight Dynamics Laboratory (AFFDL) results in AFFDL- TR-65-146 (1965); Zielsdorff and Carlson (1972). Similarly, Dyshel (1990;1999;2002) has presented some variety of experimental results on the stability and fracture of plate with a central crack referred to as a non-classical problem. A.E. Seif and M.Z. Kabir / An efficient analytical model to evaluate the first two local buckling modes of finite cracked plate under tension
In this paper, the general forms of in-plane fields of a finite cracked plate have been achieved in the elastic range by expanding the potential functions of the infinite cracked plate about the crack tip. Subsequently, the stress intensity at the crack tip has been obtained. In addition, the numerical models have been provided by the finite element method.The effect of finite sizes on the stress and displacement fields has been detected and to validate the obtained analytical relations, the least-squares curve fitting has been used. Moreover, the calculated stress intensity correction factors have been compared with the existing results in the literature.
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