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XSHLPRM

ISHELL

ISH3N

ISMSTR

ITHICK

IPLAS

NIP

IDRIL

Field

Contents

ISHELL

4-node shell element formulation flag.

Default = 24 (Integer)

1 - Q4, visco-elastic hourglass modes orthogonal to deformation and rigid modes (Belytschko).

2 - Q4, visco-elastic hourglass without orthogonality (Hallquist). Is incompatible with one integration point for shell element.

3 - Q4, elastic-plastic hourglass with orthogonality.

4 - Q4 with improved type 1 formulation (orthogonalization for warped elements).

12 - QBAT or DKT18 shell formulation.

24 - QEPH shell formulation.

ISH3N

3-node shell element formulation flag.

Default = 2 (Integer)

1 - Standard triangle (C0).

2 - Standard triangle (C0) with modification for large rotation.

30 - DKT18.

31 - DKT_S3.

ISMSTR

Shell small strain formulation flag.

Default = 2 (Integer)

1 - Small strain from time =0 (new formulation compatible with all other formulation flags).

2 - Full geometric non-linearity with optional small strain formulation activation by time step.

3 - Old small strain formulation (only compatible with ISHELL =2).

4 - Full geometric non-linearity (Time step limit has no effect).

ITHICK

Shell resultant stresses calculation flag.

Default = VAR (CONST or VAR)

CONST - Thickness is constant.

VAR - Thickness change is taken into account. Recommended to use IPLAS = NEWT.

IPLAS

Shell plane stress plasticity flag (MATX2, MATX27, and MATX36 only).

Default = NEWT (RAD or NEWT)

RAD - Radial return.

NEWT - Iterative projection with 3 Newton iterations.

NIP

Number of integration points through the thickness.

= 0: defines global integration and is only compatible with MAT1, MATX2, and MATX36.

Default = 5 (Integer 0 < N < 10)

IDRIL

Drilling degree of freedom stiffness flag.

Default = 0 (Integer)

0 = No

1 = Yes