Comparative study and optimization of the mechanical behavior of sandwich beams loaded in three point bending

F Bourouis, F Mili



The sandwich material presents a certain interest in term of rigidity and specific resistance for the aeronautic structure design. The study of this material meets always the choice problem of their constituents (coating and core) in order to find the optimal mechanical characteristic. The aim of this work is to do a comparative study of the mechanical behavior of the sandwich beams loaded in three point bending. The structures considered consist of two skins of composite material with unidirectional fibers of six plies Glass/epoxy, Carbon/epoxy or Kevlar/epoxy of stacking sequence [0°/90°]3s and [45°/-45°]3s and the core is in Alporas , Corecel, PVC, or Polyurethane foams. The different results obtained from the Matlab code showed that the correct choice of the material of the coatings and of the core that improves the mechanical behavior of the sandwich beam. In order to increase the performance of sandwich beams, in three points bending, an optimization program based on the principles of genetic algorithms has been developed to maximize the tensile strength of face yielding and face wrinkling failure modes. The equations used to evaluate the individuals in population results from the classical laminate theory with transverse shear stresses and discrete variables. Operators of genetic algorithms (selection, crossover and mutation) are applied to the children of a hundred generations. To achieve optimal solutions, the result appeared effective despite all the non-deterministic nature of genetic algorithms. But, to achieve maximum effectiveness, it’s important to choose smartly the parameters of genetic algorithms depending on the nature of the problem studied and the mechanical characteristics of the function to be optimized.

Full Text:



Ashby, M.F., Evans, A.G., Fleck, N.A., Gibson, L.J., Hutchinson, J.W., & Wadley, H. (2000). Metal foams a design guide, Butter worth Heinemann. United States of America.

Berthelot, J.M. (1996). Mechanical Behaviour of Composite Materials and Structures, Masson., Paris.

Craig, A.S., & Norman, A.F. (2004). Material selection in sandwich beam constructions. Scripta Materialia, 50, 1335-1339.

Gdoutos, E. E., Daniel, I. M., & Wang, K. A. (2003). Compression facing wrinkling of composite sandwich structures. Mechanics of materials, 35(3-6), 511-522.

Hamidreza, S., Bahador S., Hoseini ,F.A., & Ahmadzadeh, M. (2012). Use of Genetic Algorithms for Optimal Design of Sandwich Panels Subjected to Underwater Shock Loading. Strojniski Vestnik/Journal of Mechanical Engineering, 58(3), 156-164.

Jin, D., Thomas, H.H. (2003). Flexural behavior of sandwich beams fabricated by vacuum-assisted resin transfer molding. Composite Structures, 61(3), 247-253.

Tahani, M., Kolahan, F., & Sarhadi, A. (2005). Genetic algorithm for multi-objective optimal design of sandwich composite laminates with minimum cost and maximum frequency. In International Conference on Advances in Materials, Product Design & Manufacturing Systems.

Zinker, D. (1995). An Introduction to Sandwich Construction. EMAS Solihull., United Kingdom.

Article views 479

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Civil Engineering and Architecture Faculty- University Amar Telidji of Laghouat JBMS@2019.