TY - JOUR
TI - Statistical assessment of natural frequency values obtained from numerical analyses in the tapered composite laminated beams
AU - Ovali Ismail
JN - Thermal Science
PY - 2023
VL - 27
IS - 4
SP - 3241
EP - 3250
PT - Article
AB - In the last years, the glass/epoxy laminated composites which are a  combination of glass reinforcement and epoxy matrix are widely used in the  field of automotive and aerospace due to their strength/weight ratio. The  proposed study statistically evaluates the natural frequency data obtained  by the numerical analysis of glass reinforced epoxy matrix beams with  Taguchi method. Accordingly, numerical analyzes were performed based on L27  orthogonal array at different levels of tapered angle (0, 0.25, and 0.5),  fiber orientation angle (30°, 600°, and 900°), and a/l ratio (delamination  ratio) (0, 0.25, and 0.5). The obtained results were evaluated with analysis  of variance (ANOVA), regression analysis, main effects, and interactions  plots. Lastly, it was observed that the tapered angle changes directly with  the natural frequency and inversely with a/l delamination rate, and there is  a dramatic increase in the natural frequency at the 30° angle. With  regression analysis, the effects of main, interaction, and squares of  factors on natural frequency are predicted with a coefficient of  determination of 95.63%. Finally, the optimum natural frequency is obtained  at third level of the tapered angle (A = 0,5), the first level of angle (B =  30°) and a/l ratio (C = 0) as 40.091 Hz.