Damage of plates due to impact, dynamic pressure and explosive loads

Norman Jones

doi:10.1590/s1679-78252013000400006

Abstract

It is the purpose of this article to present design equations which can be used to predict the damage of ductile plating when subjected to mass impact, dynamic pressure or impulsive loadings. The external loadings are sufficiently severe to produce inelastic material behaviour and produce finite transverse displacement, or geometry change, effects. The damage is characterised as the final or permanent transverse displacement of a plate. The theoretical method predicts values for the maximum permanent transverse displacements which agree reasonably well with the corresponding experimental results generated on aluminium alloy circular, square and rectangular plates. Thus, the equations presented in this article are valuable for preliminary design purposes and for forensic studies, while the experimental data can be used for validating numerical schemes.

Highlights

Simple and reliable theoretical methods are still valuable for design purposes, for preliminary design, hazard assessments, integrity and security studies and for forensic investigations after accidents
Papers have been published over the years which contain theoretical studies and experimental results for the ductile behaviour of circular, square and rectangular plates struck by masses and exposed to dynamic pressure pulses and explosive loadings
Comparisons were made for square aluminium alloy plates and for circular plates, again with encouraging agreement between the theoretical rigid plastic predictions and the corresponding experimental results

Summary

Introduction

Simple and reliable theoretical methods are still valuable for design purposes, for preliminary design, hazard assessments, integrity and security studies and for forensic investigations after accidents In these practical situations, a designer is interested in the damage that a structure sustains under external loadings which produce large deformations and associated inelastic strains. A method of analysis was outlined in [1] and used to predict the response of a fully clamped rectangular plate when struck by a mass impact loading at the plate centre. It transpires that encouraging agreement was obtained with the experimental values for the maximum permanent transverse displacements of square and rectangular mild steel plates. Comparisons were made for square aluminium alloy plates and for circular plates, again with encouraging agreement between the theoretical rigid plastic predictions and the corresponding experimental results

Methods

Discussion

Conclusion