p_solid

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p_solid

Purpose

Element property function for volume elements.

Syntax

il=p_solid('default') 
il=p_solid('database ProId Value')
il=p_solid('dbval ProId Value')
il=p_solid('dbval -unit TM ProId name');

Description

This help starts by describing the main commands : p_solid Database and Dbval. Supported p_solid subtypes and their formats are then described.

[Database,Dbval] ...

Element properties are described by the row of an element property matrix or a data structure with an .il field containing this row (see section 7.4). Element property functions such as p_solid support graphical editing of properties and a database of standard properties.

Accepted value in commands for the database are

d3 2 : 2x2x2 integration rule for linear volumes (hexa8 ... )
d3 -3 : default integration for all 3D elements
d3 3 : 3x3x3 integration rule for quadratic volumes (hexa20 ... )
d2 2 : 2x2x2 integration rule for linear volumes (q4p ... ). You can also use d2 1 0 2 for plane stress, and d2 2 0 2 for axisymetry.
d2 3 : 3x3x3 integration rule for quadratic volumes (q8p ... )

For fixed values, use p_solid('info').

For a tutorial on material/element property handling see section 5.3.1. For a programmers reference on formats used to describe element properties see section 7.4.

Examples of database property construction

  il=p_solid([100 fe_mat('p_solid','SI',1) 0 3 0 2], ...
             'dbval 101 Full 2x2x2','dbval 102 d3 -3');
  il=fe_mat('convert SITM',il);
  il=p_solid(il,'dbval -unit TM 2 Reduced shear')

Subtype 1 : 3D volume element

[ProID fe_mat('p_solid','SI',1) Coordm In Stress Isop ]

ProID	Property identification number
Coordm	Identification number of the material coordinates system (not used yet)
In	Integration rule selection (see integrules Gauss). 0 selects the legacy 3D mechanics element (of_mk_pre.c), -3 the default rule.
Stress	Location selection for stress output (NOT USED)
Isop	Integration scheme (will be used to select shear protection mechanims)

The underlying physics for this subtype are selected through the material property. Examples are 3D mechanics with m_elastic, piezo electric volumes (see m_piezo), heat equation (p_heat).

Subtype 2 : 2D volume element

  [ProId fe_mat('p_solid','SI',2)  Form N In]

ProID	Property identification number
Type	Identifier obtained with fe_mat('p_solid,'SI',2)
Form	Formulation (0 plane strain, 1 plane stress, 2 axisymetric), see details in m_elastic.
N	Fourier harmonic for axisymetric elements that support it
In	Integration rule selection (see integrules Gauss). 0 selects legacy 2D element, -3 the default rule.

The underlying physics for this subtype are selected through the material property. Examples are 2D mechanics with m_elastic.

Subtype 3 : ND-1 coupling element

  [ProId fe_mat('p_solid','SI',2) Integ Form Ndof1 ...]

ProID	Property identification number
Type	Identifier obtained with fe_mat('p_solid,'SI',3)
Integ	Integration rule selection (see integrules Gauss). 0 or -3 selects the default for the element.
Form	1 volume force, 2 volume force proportionnal to density, 3 pressure, 4: fluid/structure coupling, see fsc, 5 2D volume force, 6 2D pressure