Internal Blast in a Compartment-type Vessel. Part 1: Finite Element Modeling Investigation
DEFENCE RESEARCH AND DEVELOPMENT CANADA VALCARTIER (QUEBEC)
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The objective of this document is to investigate the feasibility of using the LS-DYNA code to perform a finite element analysis to study the structural damage of a typical compartment-type vessel caused by an internal blast. The work is divided into two investigations one considers the generation and propagation of the blast and the other investigation looks at the material-damage and failure models that could be used to predict the damage on the compartment structure. The first investigation presents results and lessons learned from four studies. These studies simulated the blast propagation using the arbitrary lagrangian eulerian ALE approach in LS-DYNA. This investigation included parametric studies as well. Regardless of the work done, it was not possible to generate a finite element model, fine enough and yet still manageable to capture maximum incident pressure and impulse with a domain large enough to include the whole compartment. Alternative methods, such as the raytracer approach, were not part of this work but should be addressed in the future. The second investigation discusses different issues regarding the use of damage and failure models in LS-DYNA. It is recommended to develop an ad hoc method to predict the damage and failure in large scale model. This method should include a material-damage model, a failure criterion, as well as a study on the mesh. Experimental data should also be used to validate the model.
- Computer Programming and Software
- Marine Engineering