Dynamic analysis of a stiffened composite plate under blast load: A new model and experimental validation

• Published in: International journal of impact engineering 2020-09, Vol.143, p.103591, Article 103591
• Main Authors: Balkan, Demet, Demir, Özgür, Arıkoğlu, Aytaç
• Format: Article
• Language: English
• Subjects: Blast loads; Boundary conditions; Carbon-epoxy composites; Composite structures; Dynamic response; Dynamical systems; Equations of motion; Galerkin method; Galerkin's method; Honeycomb cores; Laminar composites; Laminates; Mathematical models; Non-uniform blast load; Nonlinear dynamics; Nonlinear equations; Numerical analysis; Stiffened composite Plate; Stiffeners
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2020.103591

•A new model is offered for the plate with stiffener.•The effect of sandwich stiffeners on the dynamic response of laminated composite plates under the non-uniform blast load is examined.•A parametric study was conducted to compare the current methods with the developed plate / stiffener mathematical model and the Galerkin's method used for the solution of this model.•Galerkin's solution were compared with the finite element method for optimal multi-parameter stiffened plate design stage.•A special experimental setup was used for the blast tests. In this paper, the nonlinear dynamic behavior of a laminated composite plate with sandwich stiffener subjected to the non-uniform blast load is investigated. The main plate examined has four layers carbon/epoxy and the stiffeners composed of carbon/epoxy face sheets and polypropylene honeycomb core. The experimental and theoretical studies are carried out in order to investigate the effect of sandwich stiffeners on the dynamic response of laminated composite plates under the blast load. In the theoretical study, the equations of motion of the stiffened laminated composite plate are derived by the use of virtual work principle. Geometric nonlinearities are modelled by taking von Kármán Large Deformation Theory into account for the sandwich plate. The clamped boundary conditions are considered for all edges of the plate. The equations of motion are discretized into the time domain by using Galerkin's method. The nonlinear coupled equations system is solved by NDSOLVE function of Mathematica Software and the displacements, strains and stresses are calculated in order to investigate the stiffened laminated composite plate's response to the blast load. The experimental, theoretical and numerical analysis results are compared.