# Capabilities and Limitations

AMS is compatible with the following options:

## Kinematic Conditions

- Boundary conditions: /BCS
- Imposed velocities: /IMPVEL
- Imposed displacements: /IMPDISP
- Imposed accelerations: /IMPACC
- Tied contacts: /INTER/TYPE2
`Spot`_{flag}0, 1, 2 (kinematic formulation), 25, 27 or 28 (penalty formulation)- Rigid bodies: /RBODY (provided they are not sensor activated or deactivated)
- Fixed rigid walls: /RWALL with
`node_ID`= 0 or blank (in case of friction, it is still advised to use a rigid meshed impactor, due to AMS cost) - Moving rigid walls: /RWALL with
`node_ID`> 0 (in case of friction, it is still advised to use a rigid meshed impactor, due to AMS cost) - Rigid links: /RLINK
- Kinematic joints: /KJOINT (/PROP/TYPE33) and /KJOINT2 (/PROP/TYPE45)
- Cylindrical joints: /CYL_JOINT
- Active sections: /SECT
- Velocities: /VEL/TRA or /VEL/ROT
- Initial velocities: /INIV/TRA or /INIV/ROT

- Rigid bodies can be activated and deactivated with /RBODY/ON and OFF as Engine keywords
- Rigid elements: /RBE2
- Interpolation constraint elements: /RBE3

## Elements

- All classical: trusses, beams, springs, shells, and solids
- 4-node tetra: /TETRA4, only if
`I`_{tetra4}=0 - 10-node tetra: /TETRA10, only if
`I`_{tetra10}=0 - Element formulation:
- QEPH
`I`_{shell}=24 and all other`I`_{shell}options - HEPH
`I`_{solid}=24

- QEPH

## Interfaces

- TYPE2 (see Tied contacts above)
- TYPE7
- TYPE10
- TYPE11
- TYPE19
- TYPE21
- TYPE24
- TYPE25
- Dynamic relaxation: /DYREL, /ADYREL
- Rayleigh damping: /DAMP
- /DT/Eltyp/Keyword3 is compatible with
/DT/AMSThis includes /DT/Eltyp/CST for which the small strain formulation is activated for an element when
(1) $$\text{\Delta}{T}_{sca}\cdot \frac{l}{c}<\text{\Delta}{T}_{\mathrm{min}}$$Where,- $l$
- Element characteristic length,
- $c$
- Speed of sound into the material

- /DT/AMS applied to selected parts (in
/AMS from Starter Input file) does not exclude
concurrent usage of /DT/NODA/CST applied to non-AMS
designated parts of the rest of the model. This is even advised in order to
minimize computing time in models where AMS only applies to selected parts.
Note: It is pointless to use a higher time step in AMS than the one used in classic mass scaling since the smaller time step limits the performance.
- Airbags without reference metrics should work