Test and Numerical Analysis of Underwater Explosion on Circular Plates

2012 ◽  
Vol 187 ◽  
pp. 74-79
Author(s):  
A.A. Sheikhi Koohsar ◽  
S.M.S. Nasereddini ◽  
E. Bazrafshan
Keyword(s):  
Numerical Analysis ◽  
Strain Rate ◽  
Good Accuracy ◽  
Underwater Explosion ◽  
Steel Plates ◽  
Test Results ◽  
Circular Plates ◽  
Two Phase ◽  
Strain Rate Effects ◽  
Rate Effects

Underwater explosion is a complex discussion because it has two phase environment including shock waves, bubble effects, cavitation, high strain rate, geometric and material non linearity. Results of underwater explosion tests on the circular steel plates have been discussd. Test results compared with numerical analysis results which it is done by LS-DYNA code. LS-DYNA is the software which is used to analyze large dynamic deflections by use of explicit method. We found that this code has good accuracy to predict the maximum deflections. Strain rate effects included in the program by use of Cowper-Symonds relation.

Elastic, Finite Deflection and Strain Rate Effects in a Mode Approximation Technique for Plastic Deformation of Pulse Loaded Structures

1980 ◽  
Vol 22 (4) ◽  
pp. 189-197 ◽  
Author(s):  
P. S. Symonds
Keyword(s):  
Strain Rate ◽  
General Scheme ◽  
Rate Sensitivity ◽  
Finite Geometry ◽  
Approximation Technique ◽  
Test Results ◽  
Rigid Plastic ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
Clamped Beams

A general scheme is proposed for including effects of elastic deformation, finite geometry changes, and strain rate sensitivity in a simple approximate scheme for estimating maximum transient and permanent deformations in structures subjected to load pulses of high intensity. The method is applied here to fully clamped beams of mild steel subjected to explosive loading. Comparisons are made between estimates from the present method and test results, as well as with estimates by various rigid-plastic methods and (to a limited extent) with results from numerical methods.

Assessment of material strain rate effects on square steel plates under lateral dynamic impact loads

2017 ◽  
Vol 13 (2) ◽  
pp. 217-225 ◽  
Author(s):  
Kun Liu ◽  
Bin Liu ◽  
R. Villavicencio ◽  
Zili Wang ◽  
C. Guedes Soares
Keyword(s):  
Strain Rate ◽  
Steel Plates ◽  
Impact Loads ◽  
Dynamic Impact ◽  
Strain Rate Effects ◽  
Rate Effects

Strain-rate effects in self-boring pressuremeter tests in clay

2006 ◽  
Vol 43 (9) ◽  
pp. 915-927 ◽  
Author(s):  
Vincenzo Silvestri
Keyword(s):  
Strain Rate ◽  
Radial Strain ◽  
Strain Curve ◽  
Soil Mass ◽  
Test Results ◽  
Pressuremeter Test ◽  
Strain Rate Effects ◽  
Expansion Curve ◽  
Rate Effects ◽  
Strain Relationship

A method is proposed for assessing the effect of strain rate on pressuremeter test results in clay. The approach takes into account the strain rate used to expand the cavity and its variation within the soil mass, both of which influence the value of the undrained shear strength deduced from the pressuremeter expansion curve. The method is applied to quantify strain-rate effects in idealized materials and in model pressuremeter test results. The pressuremeter-deduced stress–strain curve is also used to predict the total pressure – radial strain relationship observed in one of the model tests.Key words: pressuremeter test, clays, strain rate, idealized materials, model tests.

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