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/INTER/TYPE8

/INTER/TYPE8

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/INTER/TYPE8

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Block Format Keyword

/INTER/TYPE8 - Interface Type 8 (Drawbeads)

Description

This interface is used to simulate drawbeads. It is mainly used in the process industry to model metal forming. Drawbeads are used to prevent the metal strip from sliding during the stamping process. Normals of the master segments must be oriented toward the slave nodes (unsorted group).

Format

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/INTER/TYPE8/inter_ID/unit_ID

inter_title

grnd_IDs

surf_IDm

 

Iform

 

 

 

 

 

 

Fn

Ft

DEPTH

Tstart

Tstop

Blank Format
hmtoggle_plus1Flag Definition

Field

Contents

SI Unit Example

inter_ID

Interface identifier

(Integer, maximum 10 digits)

 

unit_ID

Optional unit identifier

(Integer, maximum 10 digits)

 

inter_title

Interface title

(Character, maximum 100 characters)

 

grnd_IDs

Slave unsorted node group identifier

(Integer)

 

surf_IDm

Master surface identifier

(Integer)

 

Iform

Friction penalty formulation type

Default = 2  (Integer)

= 1: viscous (total) formulation

= 2: stiffness (incremental) formulation. Recommended when the loading speed is low.

 

Fn

Drawbead normal force per unit length

(Real)

Ft

Drawbead restraining force per unit length

(Real)

DEPTH

The drawbead depth

(Real)

Tstart

Start time for contact impact computation

(Real)

Tstop

Temporary deactivation time

(Real)

hmtoggle_plus1Comments
1.The node group for slave surface must be an unsorted group (/GRNOD/NODENS).
2.Iform =1 is not available when using Idt =1 in option /ADMESH/GLOBAL.
3.When Fn ≠ 0, Normal force is computed. The normal force is due to the bending of the blank into the draw bead as the binder closes on the die. The total contact force is the sum of the restraining force and normal force.
4.Fn represents a limiting value. The normal force begins to develop when the distance d between the blank and drawbead line is less than the drawbead depth (DEPTH). When the drawbead is close to blank (distance equal to depth), this normal force reaches a plateau Fn. The value of normal force depends on the penetration as described in the figure below:

inter_type8

Where,

5.If DEPTH = 0 or  stiffness, the slope of the linear part of the curve is reset to the stiffness of the blank so that the same time step than the one without normal force is used to guarantee the stability.

See Also:

Interface TYPE8 in User's Guide

Penalty Method in User's Guide