Estimation of dynamic load factors for elastic cylinders under dynamic internal pressure

This paper discusses the design of a cylindrical test section subjected to dynamic internal pressure for severe accident experiments performed at CEA. A commonly used method consists in computing static equivalent response structure and then applying DLF coefficients. In this paper, Dynamic Load Factor (DLF) coefficients are obtained cylinders. Based on cylinder stepped pressure, set equations is up using membrane theory with modal approach (bending moments neglected theory). As already established, it found that radial axial displacements coupled, resulting Multi-Degree Of Freedom (MDOF) model coupling. The maximum therefore determined both displacements. It reaches value when there specific ratio between radius length (parameter $$\pi R/L$$ equal 1.0), while does not depend geometry. Results compared Finite Elements simulations. On whole, results validated long cylinders (i.e. R/L\le 0.1$$ ). However, differences displacement tend increase an $$R/L$$ (shorter cylinders). regular 2.0 established Single Degree directions exceeded modes coupled. difference can be significantly higher (DLF $$\ge$$ 3.9).