STRAIN

The STRAIN function returns the strain acting on a designated node on a flexible body.

Format

Using reference marker

Using 3 reference nodes

Arguments definition

Node ID

Node number, including the names of the FFlex or RFlex Body, or argument number for the nodes to calculated for the strain value

Type

Symbol that indicates the type of strain to measure

Strain	Type	Discription
Basic strain	X	x direction from x face
	Y	y direction from y face
	Z	z direction from z face
	XY	y direction from x face
	YZ	z direction from y face
	ZX	z direction from z face
Principal strain	E1	First principal
	E2	Second principal
	E3	Third principal
Intensity	INT
Von-mises strain	VON

Setting Reference Frame

RMarker

The name or argument number of the standard marker for direction to be measured

3 reference nodes

The name or argument number of the 3 reference nodes which define reference frame to be measured

Position

Recovery Postion for FFlex output node

Type	Meaning of Caculated data
TOP	SOLID + SHELL TOP + BEAM MAX DIST
BOTTOM	SOLID + SHELL BOTTOM + BEAM MAX DIST
MD	SOLID + SHELL TOP + BEAM MAX DIST
C	SOLID + SHELL TOP + BEAM C
D	SOLID + SHELL TOP + BEAM D
E	SOLID + SHELL TOP + BEAM E
F	SOLID + SHELL TOP + BEAM F
MV	SOLID + SHELL TOP + BEAM MAX VMISES
TOP_MD	SOLID + SHELL TOP + BEAM MAX DIST
TOP_C	SOLID + SHELL TOP + BEAM C
TOP_D	SOLID + SHELL TOP + BEAM D
TOP_E	SOLID + SHELL TOP + BEAM E
TOP_F	SOLID + SHELL TOP + BEAM F
TOP_MV	SOLID + SHELL TOP + BEAM MAX VMISES
BOTTOM_MD	SOLID + SHELL BOTTOM + BEAM MAX DIST
BOTTOM_C	SOLID + SHELL BOTTOM + BEAM C
BOTTOM_D	SOLID + SHELL BOTTOM + BEAM D
BOTTOM_E	SOLID + SHELL BOTTOM + BEAM E
BOTTOM_F	SOLID + SHELL BOTTOM + BEAM F
BOTTOM_MV	SOLID + SHELL TOP + BEAM MAX VMISES
ONLY_TOP	SHELL TOP
ONLY_BOTTOM	SHELL BOTTOM
ONLY_MD	BEAM MAX DIST
ONLY_C	BEAM C
ONLY_D	BEAM D
ONLY_E	BEAM E
ONLY_F	BEAM F
ONLY_MV	BEAM MAX VMISES
ONLY_SOLID	SOLID

If the recovery position is not specified, the default value is the TOP for shell and MD for beam.

If the RFlex body has only one stress shape, this argument is ignored.

Reference Frame defined by 3 reference nodes

Figure 1 Definition of 3 nodal points reference frame

The reference frame defined by 3 nodal points is like above figure. X direction is parallel to the vector from reference node1 to reference node2 and Z direction is normal to the face which consist of 3 nodal points.

Example

STRAIN(Body1_FE.node1,X,Ground.InertiaMarker)

STRAIN(1,VON,2) < Argument: (1) Body1_FE.node1 (2) Ground.InertiaMarker >

Figure 2 Example Expression using Strain function using RM

STRAIN(1,VON,2,3,4) < Argument: (1) Body1_FE.node50588 (2) Body1_FE.node50578 (3) Body1_FE.node50579 (4) Body1_FE.node50562 >

Figure 3 Example Expression using Strain function using 3 reference nodes

Note

The strain expression must not be used to apply the dependent force. Only the expression is used in the post procedure.

In order to see the strain result for non-output nodes in Scope Expression, all component such as EX, EY etc should be included in output files.