Archive for March, 2007

Interface Component Analysis

Published by Suri Bala March 15th, 2007 in LS-DYNA Bytes. 0 Comments

Interface component analysis is a unique feature that helps to speed design variation studies for non-structural components using a model fragment of the full system model. It works by first storing the displacement time history of user-defined nodes to a disk on a file system. The stored file is a binary file and its name [...]

MultiStage Dependent or Independent Simulations using *CASE

Published by Suri Bala March 11th, 2007 in LS-DYNA Bytes. 11 Comments

A powerful feature of LS-DYNA v970 and beyond that has yet to gain widespread popularity is the *CASE keyword. Here are two examples to highlight the use of *CASE.

Sequential and Independent Simulations
Ex: Head Impact (FMVSS 201)

*keyword
$
$ Impact 1
$
*case_begin_1
*title
position 1 impact
*include
vehicle_model.i
*include
head_position_1.i
*case_end_1
$
$ Impact 2
$
*case_begin_2
*title
position 2 impact
*include
vehicle_model.i
*include
head_position_2.i
*case_end_2
$
$ ….
*end

Sequential and Dependent Simulations
Ex: Cumulative Bumper [...]

Modeling Off-Axis Dependent Yield Stress for Honeycombs using MAT_126

Published by Suri Bala March 8th, 2007 in LS-DYNA Bytes and LS-DYNA Materials. 0 Comments

Honeycomb cell structures are popular among weight conscious designers due to their high strength to weight ratio. In the automotive space, aluminum based honeycomb structures are widely used to represent barriers to simulate a controlled energy absorption. Honeycomb structures are highly anisotropic and requires adequate testing to characterize them. This post focusses on the characterization [...]

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