Journal of Science  and Technology of Composites

Journal of Science and Technology of Composites

Experimental and numerical methods for free vibration analysis of sandwich conical shells with anisogrid composite lattice core

Document Type : Research Paper

Authors
Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran.
Abstract
In this study, the modal analysis of sandwich conical shells with a composite lattice core was presented using experimental and numerical methods. For this purpose, samples of such sandwich were made of two identical Kevlar-fabric face sheets and a composite (glass-carbon fibers) lattice core with regular hexagonal cells. Next, modal tests were carried out to extract the natural frequencies and the mode shapes by collecting frequency responses using a laser accelerometer. Also, ABAQUS FE simulations were performed using three-dimensional elements and were validated with the results obtained from modal tests. According to the experimental results, the difference in the natural frequencies of samples is less than 3% for the first mode shape (m,n)=(1,2) and 6% for the second mode shape (m,n)=(1,3). Therefore, it can be concluded that there is the least possible error in the conceptual design and the implementation of various manufacturing processes. In addition, there is good agreement between the results obtained from modal tests and ABAQUS finite element method, i.e. the maximum difference in natural frequencies of the first four mode shape is approximately 16%.
Keywords

Subjects


[1] Vasiliev, V. V., and Morozov, E. V., “Advanced mechanics of composite materials and structures,” Fourth ed., Elsevier, 2018.
[2] Davies, J. M., “Lightweight sandwich construction,” First ed., John Wiley & Sons, 2008.
[3] Vinson, J. R., “The behavior of sandwich structures of isotropic and composite materials,” First ed., Routledg, New York, 1999.
[4] Shatov, A. V., Burov, A. E., and Lopatin, A. V., “Buckling of composite sandwich cylindrical shell with lattice anisogrid core under hydrostatic pressure.,” In Journal of Physics: Conference Series IOP Publishing, Vol. 1546, No. 1, pp. 01213, 2020.
[5] Zarei, M., Rahimi, G. H., and Hemmatnezhad, M., “Global buckling analysis of laminated sandwich conical shells with reinforced lattice cores based on the first-order shear deformation theory,” International Journal of Mechanical Sciences, Vol. 187, No. 12, pp.10587, 2020.
[6] Yang, J. S., Liu, Z. D., Schmidt, R., Schröder, K. U., Ma, L., and Wu, L. Z., “Vibration-based damage diagnosis of composite sandwich panels with bi-directional corrugated lattice cores,” Composites Part A: Applied Science and Manufacturing, Vol. 131, No. 4, pp. 105781, 2020.
[7] Shahgholian-Ghahfarokhi, D., Rahimi, G., Zarei, M., and Salehipour, H., “Free vibration analyses of composite sandwich cylindrical shells with grid cores: Experimental study and numerical simulation,” Mechanics Based Design of Structures and Machines, Vol. 50, No. 2, pp. 687-706, 2022.
[8] Fallah, F., Taati, E., and Asghari, M., “Decoupled stability equation for buckling analysis of FG and multilayered cylindrical shells based on the first-order shear deformation theory,” Composites Part B: Engineering, Vol. 154, No. 12, pp. 225-24, 2018.
[9] Fallah, F., and Taati, E., “On the nonlinear bending and post-buckling behavior of laminated sandwich cylindrical shells with FG or isogrid lattice cores,” Acta Mechanica, Vol. 230, No. 6, pp. 2145-2169, 2019.
[10] Chai, Y., Li, F., and Song, Z., “Nonlinear flutter suppression and thermal buckling elimination for composite lattice sandwich panels,” AIAA Journal, Vol. 57, No. 11, pp. 4863-4872, 2019.
[11] Nazari, A., Naderi, A., Malekzadefard, K., and Hatami, A. “Experimental and numerical analysis of vibration of FML-stiffened circular cylindrical shell under clamp-free boundary condition,” Journal of Science and Technology of Composites, Vol. 6, No. 1, pp. 9-20, 2019.
[12] Shahgholian-Ghahfarokhi, D., and Rahimi, G., “New analytical approach for buckling of composite sandwich pipes with isogrid core under uniform external lateral pressure,” Journal of Sandwich Structures & Materials, Vol. 23, No. 1, pp. 65-93, 2021.
[13] Karttunen, A. T., Reddy, J. N., and Romanoff, J., “Two-scale constitutive modeling of a lattice core sandwich beam,” Composites Part B: Engineering, Vol. 160, No. 3, pp. 66-75, 2019.
[14] Li, C., Shen, H. S., and Yang, J., “Low-velocity impact response of cylindrical sandwich shells with auxetic 3D double-V meta-lattice core and FG GRC facesheets,” Ocean Engineering, Vol. 262, No. 10, pp. 112299, 2022.
[15] Zarei, M., & Rahimi, G. H., “Buckling resistance of joined composite sandwich conical–cylindrical shells with lattice core under lateral pressure,” Thin-Walled Structures, Vol. 174, No. 5, pp. 109027, 2022.
[16] Barbero, E. J., “Finite Element Analysis of Composite Materials using Abaqus,” Second ed., CRC press, 2023.