Ship Blast Analysis

Naval vessels and Submarines structures in their fighting role are susceptible to explosion of torpedoes, mines, TNT etc. The damage inflicted by Contact explosion consists of direct shock wave damage to hull, whipping damage to keel and mechanical damage to onboard equipment and associated systems. The order to design a shock resistant structure, it is important to simulate these structures and loads and then subsequently analyze the same to predict the response (as performing experiments would be expensive). The TNT (Trinitrotoluene) explosion analysis of large structures like ships could be considered as one of the most complicated numerical analysis. Loads can be calculated by using published empirical formulas, which are complicated if calculated the large structure. By using of the FE Software ANSYS, backed up with in the developed software, for Explosion analysis of structures.

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FE Analysis of Ship Structures Under Blast Loads

Volume 2: Structures, Safety and Reliability ◽

10.1115/omae2008-57294 ◽

2008 ◽

Cited By ~ 1

Author(s):

Satyaranjan Sinha ◽

D. G. Sarangdhar

Keyword(s):

Solution Process ◽

Mechanical Damage ◽

Underwater Explosion ◽

Time History ◽

Complex Loading ◽

Large Structure ◽

Empirical Formulas ◽

Load Calculation ◽

Underwater Shock ◽

Shock Simulation

Naval vessels and Submarines structures in their fighting role are susceptible to Underwater shock generated due to explosion of torpedoes, mines, depth charges etc. The damage inflicted by Non-Contact Underwater explosion consists of direct shock wave damage of hull, whipping damage of keel and mechanical damage to onboard equipment and associated systems. Hence in order to design a shock resistant structure or to know the shock withstandibility of the same, it is important to simulate these structures and loads and then subsequently analyze the same to predict the response (as performing experiments would be expensive). The Underwater explosion analysis of large structures like ships could be considered as one of the most complicated numerical analysis. The most important steps of these analyses are, the accurate load calculation and then the solution process. Loads can be calculated using published empirical formulas, which are complicated if calculated for a large structure. Also the application of load time history for large structure is a tedious job. To solve the complications related to load calculation and application, an in-house software named IRUNDEX, was developed, which, not only calculates the complex loading at all panels comprising the ship structure, but could also apply the loads (using ANSYS Macro) within minutes, thus saving considerable percentage of time taken for the analysis. It could be recognized that underwater shock simulation and analysis should form an important criterion to verify the design of any Naval Vessel or structure susceptible to explosions. This present work illustrates the use of the FE Software ANSYS, backed up with the in-house developed software, for Underwater Explosion analysis of structures.

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Proteins and direct methods

Zeitschrift für Kristallographie - Crystalline Materials ◽

10.1524/zkri.1991.197.3-4.197 ◽

1991 ◽

Vol 197 (3-4) ◽

Cited By ~ 7

Author(s):

Fan Hai-fu ◽

Hao Quan ◽

M. M. Woolfson

Keyword(s):

First Principles ◽

Figure Of Merit ◽

Direct Methods ◽

Large Structure ◽

Low Resolution ◽

Figures Of Merit ◽

Large Structures ◽

Resolution Data

AbstractConventional direct methods, which work so well for small structures, are less successful for macromolecules. Where it has been demonstrated that a solution might be found using direct methods it is then found that the usual figures of merit are unable to distinguish the few good sets of phases from the large number of sets generated. The reasons for the difficulties with very large structures are considered from a first-principles approach taking into account both the factors of having a large number of atoms and low resolution data. A proposal is made for trying to recognize good phase sets by taking a large structure as a sum of a number of smaller structures for each of which a conventional figure of merit can be applied.

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