Nonlinear dynamic response of blast-loaded stiffened plates considering the strain rate sensitivity. (March 2020)

• Record Type: Journal Article
• Authors: Peng, Ying; Yang, Ping; Hu, Kang
• Is Part Of: Marine structures. Volume 70(2020)
• Publication Date: 2020-03
• Subjects: Nonlinear dynamic response -- Stiffened plates -- Singly symmetric beam model -- Strain rate sensitivity -- Instantaneous modes; Naval architecture -- Periodicals; Offshore structures -- Periodicals; Architecture navale -- Périodiques; Structures offshore -- Périodiques; Naval architecture; Offshore structures; Periodicals; 620.4162
• DOI: 10.1016/j.marstruc.2019.102699
• Languages: English
• ISSNs: 0951-8339

Abstract

Abstract: The aim of the present paper is to develop a simple theoretical method which can quickly calculate the nonlinear dynamic response of stiffened plates under a blast loading. The large deformation behavior of the stiffened plate is analyzed by using a singly symmetric beam model as representative of the stiffened plate. The material is assumed to be rigid-perfectly plastic, and the strain rate sensitivity is considered by using the Cowper–Symonds constitutive model (CS model). By Lee's extremum principle, the instantaneous modes of nonlinear structural response are determined. A series of calculations are performed to investigate the influence of pulse intensity, pulse duration, plate thickness, stiffener spacing and material property on the displacement response. The obtained results are in good agreement with those of numerical simulations performed by software package ABAQUS, and then a definition for the cases when the simplified method proposed here can be used is provided. Highlights: A simplified theoretical method is proposed to estimate the nonlinear dynamic response of stiffened plates. The strain rate sensitivity is considered in the theoretical analysis. The influences of pulse, plate thickness, stiffener spacing and material property are discussed. The deformation mechanisms may be revealed through the movement of plastic hinges along the beam. A definition for the cases when the simplified method can be used is provided.