Mechanical APDL Structural Analysis Guide

TBDATA Comments

Input

Constant

Critical Mode I energy-release rate, I

C

> 0

C1

Critical Mode II energy-release rate, 



> 0

C2





η C3 η > 0

The B-K criterion is intended for composite interfacial fracture and is suitable for 3-D mixed-mode
fracture simulation.

Example 12.4: B-K Criterion Input

g1c=10.0

g2c=20.0

h=2

TB,CGCR,1,,,BK

TBDATA,1,g1c,g2c,h

12.1.3.5. Modified B-K Fracture Criterion

The modified B-K (or Reeder) [ 9 ] option, is expressed as:

T











 

T







 

T

 

T

=

+ ( − ) +( − )













 +











−η 1

where 
,^
, and^
are Mode I, Mode II, and Mode III critical energy-release rates, respectively,
and η is the material constant. All four values can be defined as a function of temperature and are input
via the TBDATA command, as follows:

TBDATA Comments

Input

Constant

Critical Mode I energy-release rate, 



> 0

C1





Critical Mode II energy-release rate, 



> 0

C2





Critical Mode III energy-release rate, 



> 0

C3





η C4 η > 0

When 



= 



, the modified B-K criterion reduces to the B-K criterion.

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VCCT-Based Crack Growth Simulation