Validation of Air-Backed Underwater Explosion Experiments with ALE3D

Leininger, L D

Lawrence Livermore National Laboratory

关键词: Plastics;    36 Materials Science;    Ruptures;    Fracture Mechanics;    Underwater Explosions;   

DOI  :  10.2172/917915
RP-ID  :  UCRL-TR-211363
RP-ID  :  W-7405-ENG-48
RP-ID  :  917915

美国|英语

来源: UNT Digital Library

【 摘 要 】

This paper summarizes an exercise carried out to validate the process of implementing LLNL's ALE3D to predict the permanent deformation and rupture of an air-backed steel plate subjected to underwater shock. Experiments were performed in a shock tank at the Naval Science and Technology Laboratory in Visakhapatnam India, and the results are documented in reference. A consistent set of air-backed plates is subjected to shocks from increasing weights of explosives ranging from 10g-80g. At 40g and above, rupture is recorded in the experiment and, without fracture mechanics implemented in ALE3D, only the cases of 10g, 20g, and 30g are presented here. This methodology applies the Jones-Wilkins-Lee (JWL) Equation of State (EOS) to predict the pressure of the expanding detonation products, the Gruneisein EOS for water under highly dynamic compressible flow - both on 1-point integrated 3-d continuum elements. The steel plates apply a bilinear elastic-plastic response with failure and are simulated with 3-point integrated shell elements. The failure for this exercise is based on effective (or equivalent) plastic strain.