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/FAIL/SPALLING

/FAIL/SPALLING

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/FAIL/SPALLING

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/FAIL/SPALLING - Spalling and Johnson-Cook Failure Model

Description

Describes the Spalling and Johnson-Cook failure model.

Format

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/FAIL/SPALLING/mat_ID/unit_ID

D1

D2

D3

D4

D5

Pmin

Ifail_so

 

 

 

 

 

Optional line:

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

fail_ID

 

 

 

 

 
hmtoggle_plus1Flag Definition

Field

Contents

SI Unit Example

mat_ID

Material identifier

(Integer, maximum 10 digits)

 

unit_ID

Optional unit identifier

(Integer, maximum 10 digits)

 

D1

1st parameter

(Real)

 

D2

2nd parameter

(Real)

 

D3

3rd parameter

(Real)

 

D4

4th parameter

(Real)

 

D5

5th parameter

(Real)

 

Reference strain rate

(Real)

fail_johnson

Pmin

Pressure cutoff

(Real < 0)

symbol_Pa

Ifail_so

Failure model flag

(Integer)

= 1: For each integration point, spalling is allowed: once spalling is detected
(P = Pmin), the deviatoric stress is set to zero and pressure is required to be compressive.

= 2: For each integration point, spalling is allowed and solid element is deleted, if clip0236  for one integration point or layer.

= 3:  For each integration point, spalling is allowed and the deviatoric element stress tensor vanishes, if:

clip0236

= 4: Solid element is deleted, if clip0236 or P = Pmin for one integration point.

 

fail_ID

(Optional) Failure criteria identifier (Comment 3)

(Integer, maximum 10 digits)

 
hmtoggle_plus1Comments
1.This failure model is available for Solid only.
2.In this model two models are combined. The first one is the Johnson-Cook failure model, and the second one is the Spalling model (Spall is detected if (P = Pmin), the deviatoric stress is set to zero and pressure is required to be compressive).

where:

T* is computed in the material law, if this one is thermo plastic, like /MAT/HYD_JCOOK (LAW4).

3.The fail_ID is used with /STATE/BRICK/FAIL and /INIBRI/FAIL. There is no default value. If the line is blank, no value will be output for failure model variables in the /INIBRI/FAIL (written in .sta file with /STATE/BRICK/FAIL option).

See Also:

Spalling with Johnson-Cook Failure in Theory Manual

Failure to Element/Material Compatibility