Effective shock factors for the inelastic damage prediction of clamped plane plates subjected to non-contact underwater explosion

2009 ◽  
Vol 44 (3) ◽  
pp. 211-220 ◽  
Author(s):  
R Rajendran
Keyword(s):  
Damage Assessment ◽  
Underwater Explosion ◽  
Strain Analysis ◽  
Coupling Factor ◽  
Yield Response ◽  
Rectangular Plates ◽  
Current Investigation ◽  
Damage Scenario ◽  
Damage Prediction ◽  
Inelastic Damage

Shock factors are conventionally used to designate the effect of an underwater explosion on a target. The concept of the effective shock factor was introduced by Rajendran and Narasimhan in a paper entitled ‘A shock factor based approach for the damage assessment of plane plates subjected to underwater explosion’, published in the Journal of Strain Analysis in 2006 (volume 41, issue 6, pages 417–425) for predicting the elastic and yield response of circular and rectangular plates; it was revealed that the coupling factor drastically influences the effect of shock factor on the response of plane plates. It will be of immense use to the designer if effective shock factors are introduced for predicting the inelastic damage of target plates, as shock factors notionally present a pessimistic picture about the damage scenario. The current investigation introduces the concept of effective shock factors to the existing prediction methodologies for estimating inelastic damage of plane plates. Water-backed plate is analysed along with air-backed plates to represent the water-filled side shell of a ship.

scholarly journals Landslide damage assessment using the Support Analysis Framework (SAF): the 2009 landsliding event in Calabria (Italy)

2010 ◽  
Vol 26 ◽  
pp. 13-17 ◽  
Author(s):  
O. Petrucci ◽  
A. A. Pasqua ◽  
G. Gullà
Keyword(s):  
Damage Assessment ◽  
Methodological Approach ◽  
Intervention Strategy ◽  
Analysis Framework ◽  
Damage Scenario ◽  
Damage Indices ◽  
Starting Point ◽  
Landslide Damage ◽  
Final Estimate ◽  
Newspaper Data

Abstract. In this paper, a simplified methodological approach is used to assess damage indices related to landslide phenomena that occurred in Calabria (Italy) between November 2008 and January 2009. This approach, which was designed for and applied to single landslides, uses the Support Analysis Framework (SAF), a procedure containing the elements that can be damaged by a landslide grouped in categories. In this paper, we test wide-ranging use of the SAF on a number of landslides, assessing landslide damage on a municipal scale to get a final estimate of the amount of damage caused by all of the landslides that occurred in a selected municipality. Data regarding the damage caused by landslides were gathered from the press. Daily newspapers were systematically collected and elaborated to assess direct, indirect and intangible damage caused during the abovementioned period by a rainfall-triggered landsliding event. In the paper, regional- and provincial-scale results are described, and the methodological approach is briefly described. The application of the proposed methodological approach to the 2009 landsliding event shows that the results can be used to summarise landslide damage from a complex event in order to better plan an intervention strategy at a regional, provincial or municipal scale. The availability of newspaper data during the event and the speed of the proposed approach allow for rapid location of the damaged sectors during the event, which will continuously upgrade the regional damage framework. This can all be done almost in "real time". For regional agencies, this framework can be a starting point to both manage the emergency and to acquire and interpret data giving a more detailed damage distribution so that a response can be organised. Moreover, based on the damage assessment, a characterisation of the landsliding event can also be carried out and used to describe the damage scenario occurring after each type of event.

Underwater Explosion in a Pool and Damage Assessment: A Global Approach From Far-Field to Close Range

2004 ◽  
Author(s):  
O. Loiseau ◽  
K. Cheval ◽  
B. Autrusson
Keyword(s):  
Damage Assessment ◽  
High Strain ◽  
Global Analysis ◽  
Underwater Explosion ◽  
Local Analysis ◽  
Strain Rates ◽  
Method Of Images ◽  
Structure Response ◽  
Starting Point ◽  
Close Range

The concern of this paper is the study of the effects of the detonation produced by an underwater explosive device. This work applies in particular to the study of some industrial pools, filled with water and a few meters deep. These pools are generally build so as to ensure a certain watertightness, this function being obtained for instance by the adjunction of an internal liner, a few millimeters thick and made of stainless steel. Here, we focus on the possible loss of this function both by the damage caused to concrete and the perforation of the liner. Those damages could be either due on one hand to the local deformations related to the global structure response and on the other hand to the local effects of the explosion. The first aspect has been investigated previously, using in particular the so-called “Method of Images (MOI)” (F. Delmaire-Sizes et al, 2001). The second aspect only occurs when the device is in a sufficiently close range so that the pressures produced by the detonation can cause volumetric damage into the materials. The starting point of this second phenomenon is investigated in the paper on the basis of a numerical model for concrete under high pressure and high strain rates (T. J. Holmquist, 1993). The second phenomenon comes in addition with the first one. An example is conducted showing how numerical simulations for the local analysis, coupling Eulerian and Lagrangian computations, complete the previous global analysis.

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