/H3D/NODA

Engine Keyword Generate H3D contour output results for nodes.

Format

/H3D/NODA/Keyword3/Keyword4

#optional next line(s) that lists the parts to save results for.

part_ID₁ ... part_ID_N

Definition


Field	Contents	SI Unit Example
`Keyword3`	Output types.
`Keyword4`	Output types.
`part_ID`_N	Optional list of part IDs for which results will be output.

Table 1. Scalar Output
Keyword3	Keyword4	Description
`CSE_FRIC`	None	Nodal surface contact frictional energy (sum of all interfaces energy per unit of area). Not available for Edge to Edge contact.
`CSE_FRIC`	`INTER`= I or ALL	Nodal surface contact frictional energy for the defined interface (energy per unit of area). Not available for Edge to Edge contact.
`DAMA2`		Damage for TYPE2 interface. 2
`DENS`		Element density extrapolated to attached nodes for 3D ALE and FVM nodes of external and internal airbag surfaces.
`DINER`		Nodal inertia change 3
`DMASS`		Nodal mass change. 4
`DT`		Nodal time step
`ENER`		Element specific energy reported to node
`GPS1`	`P`	Element pressure extrapolated to node
`GPS1`	`VONM`	Element von Mises stress extrapolated on node
`MASS`		Nodal mass
`NDMASS`		Non-diagonal mass variation (see time step control /DT/AMS). 5
`NVAR1`, `NVAR2`, ...`NVAR5`		Nodal Variable 1, 2 …5
`P`		Element pressure extrapolated to attached nodes for 3D ALE and FVM nodes of external and internal airbag surfaces.
`SKID_LINE`	`INTER`= I or ALL	This option is available for /INTER/TYPE8 and /INTER/TYPE21. For /INTER/TYPE21, it is the maximum over time of the ratio between tangential force $F_{t}$ and the limit tangential force $F_{t} = P_{s k i d} \cdot \frac{S}{\sqrt{3}}$ . Refer to /INTER/TYPE21 to define `P`_skid. = 0.0 If no sliding or contact = $\frac{F_{t}}{P_{s k i d} \cdot \frac{S}{\sqrt{3}}}$ If sliding and $F_{t} \leq P_{s k i d} \cdot \frac{S}{\sqrt{3}}$ . Output will be between 0 and 1. = 1.0 If sliding and $F_{t} > P_{s k i d} \cdot \frac{S}{\sqrt{3}}$ . For /INTER/TYPE8, drawbead output values are: = 0 No contact. = 1.0 Main node is in contact with a drawbead.
`SSP`		Nodal sound speed (FVMBAG)
`STIF`		Nodal translational stiffness
`STIFR`		Nodal rotational stiffness
`TEMP`		Nodal temperature for thermal exchange or element temperature extrapolated to attached nodes for 3D ALE and FVM nodes of external and internal airbag surfaces.
`VFRAC`		Nodal Volumetric Fraction where the element volumetric fraction extrapolated to attached nodes in LAW37 and LAW51.
`ZVFRAC`		Nodal volumetric fraction.

Table 2. Vector Output
Keyword3	Keyword4	Description
`ACC`		Node acceleration
`AROT`		Rotational acceleration `I`_drot=1 must also be set in /IOFLAG; otherwise, rotational degrees of freedom (DOF) are not computed, and this option is ignored.
`CLUSTER`	`FORCE` `MOMENT`	Spotweld /CLUSTER force or Moment vector in global coordinates
`CONT`		Node contact forces
`CONT`	`MAX`	Maximum nodal contact forces over time
`CONT2`		Tied interface contact force (/INTER/TYPE2)
	`TMAX`	Maximum over time of tied interface contact force (/INTER/TYPE2)
	`TMIN`	Minimum over time of tied interface contact force (/INTER/TYPE2)
`DIS`		Node displacement
`DIS`	`TMAX`	Maximum node magnitude of displacement vector over time
`DROT`		Node rotation `I`_drot= 1 must also be set in /IOFLAG; otherwise, rotational degree of freedom (DOF) are not computed, and this option is ignored.
`FEXT`		External force
`FINT`		Internal force
`FOPT`		Forces or Moments for rigid bodies, rigid walls and sections.
`FRES`		Residual force (`FEXT` – `FINT`)
`FREAC`		Reaction forces for imposed velocities, displacements, accelerations and boundary conditions.
`FVEL`		Gas velocity vectors for fluid flow in Finite Volume Method monitored volume, /FVMBAG1.
`MREAC`		Reaction moments for imposed velocities, displacements, accelerations and boundary conditions.
`PCONT`		Normal or tangential contact pressure. 6
`PCONT`	`TMAX`	Maximum over time of normal or tangential contact pressure.
`PCONT2`		Normal or tangential tied contact pressure. 6
	`TMAX`	Maximum over time of normal or tangential tied contact pressure.
	`TMIN`	Minimum over time of normal or tangential tied contact pressure.
`SHELL_OFFSET`		Displacement vector from the current mesh towards the mid-surface of the shell (used with `I`_offset=1 in /DEF_SHELL card).
`VEL`		Node translational velocity
	`TMAX`	Maximum magnitude of node translational velocity vector over time
	`GRID`	ALE grid translational velocity
`VROT`		Rotational velocities `I`_drot= 1 must also be set in /IOFLAG; otherwise, rotational degree of freedom (DOF) are not computed, and this option is ignored.

Table 3. Tensor Output
Keyword3	Keyword4	Description
`GPS`		Mean nodal stress tensor calculated from the element shape functions. 7 Only available for solid elements with /PROP/TYPE6 (SOL_ORTH), /PROP/TYPE14 (SOLID), /PROP/TYPE20 (TSHELL), /PROP/TYPE21 (TSH_ORTH) and /PROP/TYPE22 (TSH_COMP)
`GPS`	`TMAX`/`N`=I	Mean nodal stress tensor calculated from the element shape functions (7) corresponding to the maximum principal stress (P1) over time. Mean nodal stress tensor calculated from the element shape functions (7) corresponding to the minimum principal stress (P3) over time. Only available with solids elements with /PROP/TYPE6 (SOL_ORTH), /PROP/TYPE14 (SOLID), /PROP/TYPE20 (TSHELL), /PROP/TYPE21 (TSH_ORTH) and /PROP/TYPE22 (TSH_COMP). The option `N`=I allows the maximum stress to be computed only every I cycles to reduce the CPU time. By default, `N`=10.
`GPSTRAIN`		Mean nodal strain tensor calculated from the element shape functions. 7 Only available with solids elements with /PROP/TYPE6 (SOL_ORTH), /PROP/TYPE14 (SOLID), /PROP/TYPE20 (TSHELL), /PROP/TYPE21 (TSH_ORTH) and /PROP/TYPE22 (TSH_COMP).
`GPSTRAIN`	`TMAX`/`N`=I	Mean nodal strain tensor calculated from the element shape functions (7) corresponding to the maximum principal strain (P1) over time. Mean nodal strain tensor calculated from the element shape functions (7) corresponding to the minimum principal strain (P3) over time. Only available with solids elements with /PROP/TYPE6 (SOL_ORTH), /PROP/TYPE14 (SOLID), /PROP/TYPE20 (TSHELL), /PROP/TYPE21 (TSH_ORTH) and /PROP/TYPE22 (TSH_COMP). The option `N`=I allows the maximum strain to be computed only every I cycles to reduce the CPU time. By default, `N`=10.
`GPS1`		Not recommended - use /H3D/NODA/GPS. Mean stress of elements connected to node. Only available for /BRICK and /TETRA4. The stress of the corner node is extrapolated from mean stress at integration point in all elements which are connected to this node.
`GPS2`		Not recommended - use /H3D/NODA/GPS. Mean (using relative element volume) stress of elements connected to node. Only available for /BRICK and /TETRA4. The stress of the corner node is extrapolated from the stress at the integration point.

Example

Node velocity vectors

/H3D/NODA/VEL

Contact pressure for only parts IDs 356 and 293.

/H3D/NODA/PCONT
356 293

Comments

When PART IDs are listed after the /H3D/NODA line the specified results will only be output for those parts.
DAMA2 damage percentages for /INTER/TYPE2 with rupture (Spot_flag = 20, 21, or 22):
$\min (100, 100 \cdot \frac{n o r m a l r e l a t i v e d i s p l a c e m e n t}{\max n o r m a l r e l a t i v e d i s p l a c e m e n t})$
$\min (100, 100 \cdot \frac{tangent r e l a t i v e d i s p l a c e m e n t}{\max t a n g e n t r e l a t i v e d i s p l a c e m e n t})$
$D I N E R = (\frac{I n e r t i a (t) - I_{0}}{I_{0}})$

Where,

$I_{0}$

Nodal inertia at the beginning of the current run

$I n e r t i a (t)$

Current inertia
$D M A S S = (\frac{Δ M}{M_{0}})$ with $Δ M = M - M_{0}$
Where,

$M_{0}$

Nodal mass at the beginning of the restart.

$M$

Current mass.

Note: $Δ M$ is re-set to 0 at the beginning of each restart file.
When /DT/AMS is used, a non-diagonal mass matrix is used to increase the time step. On each line of the mass matrix, the lumped mass $M_{0}$ is increased with some value $Δ M$ which is compensated with non-diagonal terms such that the total mass to remain constant.
$N D M A S S = (\frac{Δ M}{M_{0}})$
For PCONT or PCONT2, two nodal vectors are output:
$P_{n} = \frac{F_{n}}{S}, P_{t} = \frac{F_{t}}{S}$
Where,

$F_{n}$

Sum of normal contact forces applied to the node

$F_{t}$

Sum of tangential contact forces applied to the node

$S$

Extrapolated surface of segments connected to the node
The stress or strain of the corner node is computed using bilinear extrapolation of the shape function from stress or strain at integration points of each element which are connected to this node. For thick shell properties, bilinear extrapolation is computed using integration points of upper and lower layers.