Capabilities and Limitations

Kinematic Conditions

  • Boundary conditions: /BCS
  • Imposed velocities: /IMPVEL
  • Imposed displacements: /IMPDISP
  • Imposed accelerations: /IMPACC
  • Tied contacts: /INTER/TYPE2 Spotflag 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
    • /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 Itetra=0
    • 10-node tetra: /TETRA10
  • Element formulation:
    • QEPH Ishell=24 and all other Ishell options
    • HEPH Isolid=24
  • Interfaces: /DT/AMS is only compatible with interfaces:
    • TYPE2 (see Tied contacts above)
    • TYPE7
    • TYPE10
    • TYPE11
    • TYPE19
    • TYPE21
    • TYPE24
  • Dynamic relaxation: /DYREL
  • Rayleigh damping: /DAMP
  • /DT/Eltyp/Keyword3 is compatible with /DT/AMS (except, /DT/INTER/CST that only applies to the nodes not concerned by /DT/AMS, that is, nodes not belonging to the part group (grpart_ID) declared in Starter /AMS, similarly to /DT/NODA/CST). This includes /DT/Eltyp/CST for which the small strain formulation is activated for an element when (1)
    Δ T s c a ⋅ l c < Δ T min MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbbG8FasPYRqj0=yi0dXdbba9pGe9xq=JbbG8A8frFve9 Fve9Ff0dmeaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaqGuoGaam ivamaaBaaaleaacaWGZbGaam4yaiaadggaaeqaaOGaeyyXIC9aaSaa aeaacaWGSbaabaGaam4yaaaacqGH8aapcaqGuoGaamivamaaBaaale aaciGGTbGaaiyAaiaac6gaaeqaaaaa@4575@
    Where,
    l MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbbG8FasPYRqj0=yi0dXdbba9pGe9xq=JbbG8A8frFve9 Fve9Ff0dmeaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaWGSbaaaa@374F@
    Element characteristic length,
    c MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbbG8FasPYRqj0=yi0dXdbba9pGe9xq=JbbG8A8frFve9 Fve9Ff0dmeaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaWGJbaaaa@3746@
    Speed of sound into the material
  • /DT/AMS applied to selected parts (in /AMS from Starter Input file) does not exclude a joint 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 that 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