/DEF_SHELL

Block Format Keyword This keyword is used to set default values for certain parameters in all shell properties, but options could still be changed in each property set input and in this case, the latter will prevail.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/DEF_SHELL
Ishell Ismstr Ithick Iplas Istrain     Ish3n Idril  

Definitions

Field Contents SI Unit Example
Ishell Shell element formulation flag
=1
Default if /IMPLICIT is not used in deck
Q4, visco-elastic hourglass modes orthogonal to deformation and rigid modes (Belytschko)
=2
Q4, visco-elastic hourglass without orthogonality (Hallquist)
=3
Q4, elasto-plastic hourglass with orthogonality
=4
Q4 with improved type 1 formulation (orthogonalization for warped elements)
=12
QBAT shell formulation
=24
Default if /IMPLICIT is used in deck
QEPH shell formulation

(Integer)

  
Ismstr Shell small strain formulation flag
=1
Small strain from time = 0
(new formulation compatible with all other formulation flags)
=2 (default)
Full geometric nonlinearities with possible small strain formulation activation in Radioss Engine (option /DT/Eltyp/Iflag)
=3
Old small strain formulation (only compatible with Ishell =2).
=4
Full geometric nonlinearities (in Radioss Engine, option /DT/SHELL/CST has no effect).

(Integer)

  
Ithick Shell resultant stresses calculation flag
=1
Thickness change is taken into account.
=2 (Default)
Thickness is constant.

(Integer)

  
Iplas Shell plane stress plasticity flag
=1
Default if /IMPLICIT is used in deck.
Iterative projection with three Newton iterations.
=2
Default if /IMPLICIT is not used in deck.
Radial return

(Integer)

  
Istrain Compute strains for post-processing flag
=1 (Default)
Yes
=2
No

(Integer)

  
Ish3n 3-node shell element formulation flag
=1
Standard triangle (C0)
=2 (Default)
Standard triangle (C0) with modification for large rotation
=30
DKT18
=31
DKT_S3, which based on DTK12 of BATOZ

(Integer)

  
Idril Drilling DOF stiffness flag
=0
Default if /IMPLICIT is not used in deck
No
=1
Default if /IMPLICIT is used in deck
Yes

(Integer)

  

Comments

  1. This card is read only once. Only the first card /DEF_SHELL written in the model is used. The other card /DEF_SHELL is ignored.
  2. Refer to the comments in /PROP/TYPE1 (SHELL) for more information about these input options.