Bug 9158
support *RIGIDWALL_FORCE_TRANSDUCER in LSPP 4.1
2013-11-24

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There are 3 parameters on Card 5 of *control_contact that deal with rigidwalls.

Rigid walls are penalty-based when running an implicit solution, therefore some penetration is expected.   See the variable RWKSF (Card 5, 5th field of *control_contact). 

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Regarding Energy:
Stonewall energy (better known as rigidwall energy) is dissipative and, according 
to the LS-DYNA Theory Manual, is the change in kinetic energy of the slave nodes 
as a result of interaction with the rigidwall (p. 557 of the 2006 Theory Manual pdf file, 
Section 26.14).

In contrast, the non-frictional component of sliding interface energy (better known as 
contact energy) is elastic/recoverable.  

Thus two methods of modeling impact with a rigid surface...

(1) *rigidwall_planar

(2)  meshing a fixed, rigid surface with *mat_rigid and using *contact_...

... are not equivalent. 

The first is a fully plastic impact; the second is a fully elastic impact (neglecting friction).


The friction component of rigidwall force also contributes to rigidwall energy as
demonstrated by ftp://ftp.lstc.com/outgoing/jday/rwall_friction.k.