/FRIC_ORIENT

Block Format Keyword Define specific directions for orthotropic contact friction for the master surface for contact interfaces TYPE7, TYPE19, TYPE24, and TYPE25.

These orientations are used when an orthotropic friction model is defined in /FRICTION Idir=1. Only shell elements are supported.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/FRIC_ORIENT/`fric_ID`
`friction_orientation_title`

Repeat these two lines to define different friction orientation values for specific parts or groups of parts

(1)	(2)	(3)	(5)	(7)	(8)	(10)
/FRIC_ORIENT/`fricorient_ID`
`friction_orientation_title`
`grpart_ID`	`part_ID`
`V`_X		`V`_Y	`V`_Z	`Skew_ID`	$ϕ$	`I`_orth

Definitions

Field	Contents	SI Unit Example
`fric_ID`	Friction identifier (Integer, maximum 10 digits)
`friction_orientation_title`	Friction model title (Character, maximum 100 characters)
`grpart_ID`	Part group identifier /GRPART. (Integer)
`part_ID`	Part identifier. Ignored if, `grpart_ID` is defined. (Integer)
`V`_X	X component for reference vector. Default = 1.0 (Real)
`V`_Y	Y component for reference vector. Default = 1.0 (Real)
`V`_Z	Z component for reference vector. Default = 1.0 (Real)
`Skew_ID`	Skew identifier for reference vector. 2 If the local skew is defined, its X-axis replaces the global vector, $V$ . `V`_X, `V`_Y and `V`_Z coordinates are ignored. Default = 0 (Integer)
$ϕ$	Angle. 2 (Real)	$[\deg]$
`I`_orth	Orthotopic system formulation flag for reference vector. = 0 (Default) The first axis of orthotropy is maintained at constant angle with respect to the X-axis of an orthonormal co-rotational. = 1 The first orthotropy direction is constant with respect to a non-orthonormal system of deformed element. (Integer)

Comments

These friction directions replace the orthotropic directions defined in the property for defined parts.
Orthotropy in local coordinate system via two different ways:
- Skew_ID =0: Orthotropic direction defined with global vector $V$ (components defined in Line 4) and angle $ϕ$ (angle in degree).
- Skew_ID ≠0: Orthotropic direction defined with skew (X-axis in skew replaces the global vector $V$ ) and angle $ϕ$ (angle in degree).
For both ways (with vector $V$ or with skew), the projection of vector $V$ (or x-axis of skew) on shell element plane becomes the vector $V'$ . Then the orthotropic direction (direction 1) is vector $V'$ turned $ϕ_{i}$ degrees where the positive direction is based on the shell normal $n$ .

Figure 1.