Fragment loading using SPH particles

[Wong Ming Hao]

Dear all,

I am trying to simulate casing-fragment loading on RC structures using SPH particles. The explosive is modeled using Lagrangian solid elements, and a node-to-surface penalty contact is defined between the casing and explosive to transfer detonation pressure to the casing.

However, I am unable to achieve the required fragment velocity of approximately 1000 m/s. Could anyone suggest suitable *CONTROL_SPH and *SECTION_SPH settings, or advise on parameters that may affect fragment acceleration in this model?

Thanks,
Ming Hao

[l...@schwer.net]

1\ What is the explosive type and where did you get the material and equation-of-state input parameters?

 

2\ Is the detonation point at the end of the cylinder or somewhere along the length?

 

                --len

Thanks,
Ming Hao

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[Dennis Chen]

Hello, I want to ask if anyone can share with me some good references or examples related to the modelling of the explosion event inside a bullet casing right after hammer strikes.    I like to ask for advice on good reference reading materials to explain both what is really happening and how lsdyna can be used to represent this physics.   I've seen paper related to Mat_075 and EOS_JWL, etc, but info i have is scattered. 

Thank you for your advice and help in advance.

To view this discussion visit https://groups.google.com/d/msgid/ls-dyna2/000401dcde27%24762c7c70%2462857550%24%40schwer.net.

[l...@schwer.net]

The web site:  LSDYNA Conference Papers

provides access to most of the LS-DYNA Conference manuscripts (PDF files).

 

This is an excellent resource when searching for LS-DYNA related topics via search string or author name, e.g. “ALE Mapping” or “Schwer.”

 

                              --len

To view this discussion visit https://groups.google.com/d/msgid/ls-dyna2/CACLqvhFjc%2BGioTkHq59YjvP34W1WpO9icrvEE7KjEBA4upjfFw%40mail.gmail.com.