Leszek Wittenbeck

Numerical analysis of sandwich beam with corrugated core under three-point bending

The strength problem of sandwich beam with corrugated core under three-point bending is presented.The beam are made of steel and formed by three mutually orthogonal corrugated layers. The finite element analysis (FEA) of the sandwich beam is performedwith the use of the FEM system - ABAQUS. The relationship between the applied load and deflection in three-point bending is considered.

Experimental three-point bending of sandwich beam with corrugated core

Presented paper isdevoted to experimental test of three-point bending of sandwich beam. The core of the beam was formed by three mutually orthogonal corrugated layers.

Approximate solutions of equilibrium equations of sandwich circular plate

The paper is devoted to a sandwich circular plate consisting of two facings and a core with variable mechanical properties. The simply supported plate is compressed in the middle plane. The mathematical and physical model of the plate is formulated, and also the field of displacements. The system of equilibrium equations is derived basing on the principle of the total potential energy. Then the system is approximately solved. Three formulas for an unknown function of displacements are assumed. The solutions (critical loads) are compared and presented in Figures and Tables.

Stability of Elastic Orthotropic Circular Cylindrical Vessels

This paper is devoted to stability investigation of orthotropic circular cylindrical vessels subjected to external pressure. An untypical orthotropic structure that consist of two layers: smooth-external and corrugated-internal is proposed. The investigation is divided into two steps. In first one analytical formulas describing buckling behaviour are derived. In second step numerical analysis is performed by using FEM to obtain the correlation between analytical and numerical results. Authors also considered linear and nonlinear buckling analysis. During the linear analysis the influence of vessel geometry on critical pressure is determined. Nonlinear analysis is carried out to create equilibrium paths which show the behaviour of vessels in post-buckling state. The results of the analysis are presented in figures.Copyright