Effect of porosity distribution on flexural and free vibrational behaviors of laminated composite shell using a novel sinusoidal HSDT

This work analyzes the impact of porosity on the static and dynamic behaviors of laminated composite shells using a novel high-order shear deformation theory. The employed model considers five unknown variables with a new sinusoidal shear function which provides precise distribution of transversal shear stresses through the thickness direction of the shell. The porosity can occur in the structure and can reduce their mechanical properties. For this purpose, three different porosity distributions in the thickness direction are considered in this investigation, the first model has the same percentage of the micro-void in the all thickness, the second one the percentage of the porosity is higher in the upper and lower surfaces contrary the third model the porosity percentage is maximum at the means axis. The governing differentials equations are derived using Hamilton’s principle and solved by Navier’s method. In the numerical results, transversal deflection, natural frequencies and axial and shear stresses are determined for laminated composite plates and shells with porosity, to verify the exactness and effectiveness of the new shell theory and to compare the results with those of the other solutions previously published.

---

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).