That’s a detailed answer:In Abaqus, you can define a failure criterion based on the maximum stress in a specific element (not cell, as elements are the basic unit of analysis in Abaqus). Once this criterion is reached, you can terminate the analysis using the Abaqus/Standard or Abaqus/Explicit solvers.

To define the failure criterion based on maximum stress in an element, you can use the *CRITERIA option in Abaqus. Here is an example input file snippet that sets the failure criteria for maximum principal stress in an element:

===============code=========

*EL FILE

ELSET, ELSET_NAME

*ELASTIC

E, NU

*DENSITY

DENSITY

*HOURGLASS STIFFNESS

KH

*CRITERIA, MATERIAL=MAT_NAME

MAX_PRINCIPAL, STRESS, ELSET=ELSET_NAME, VALUE=STRESS_VALUE

=====================================================

In this input file, ELSET_NAME is the name of the element set that contains the elements for which the failure criterion is defined. MAT_NAME is the name of the material used in the analysis. STRESS_VALUE is the maximum allowable principal stress for the element.

Once the failure criterion is defined, you can use the Abaqus/Standard or Abaqus/Explicit solver to run the analysis. In the input file for the solver, you can use the *STEP option to define the analysis steps. You can set the maximum number of steps to be executed using the MAXIMUM NUMBER OF STEPS option. To terminate the analysis when the failure criterion is reached, you can use the *STATIC option in Abaqus/Standard or the *DEATH option in Abaqus/Explicit.

Here is an example input file snippet for Abaqus/Standard that terminates the analysis when the failure criterion is reached:

======================code========================

*STEP, NAME=STEP_NAME, NLGEOM=YES

*STATIC

MAXIMUM NUMBER OF STEPS, MAX_NUM_STEPS

*BOUNDARY

BOUNDARY CONDITIONS

*OUTPUT

OUTPUT REQUESTS

*END STEP

*NODE FILE

U, RF

*EL FILE

S

*END FILE

=================

In this input file, STEP_NAME is the name of the analysis step, MAX_NUM_STEPS is the maximum number of steps to be executed, and BOUNDARY CONDITIONS are the applied loads and constraints. The *NODE FILE and *EL FILE options are used to output the nodal and elemental results, respectively.

To terminate the analysis when the failure criterion is reached, you can modify the *STEP option as follows:

========code ===============

*STEP, NAME=STEP_NAME, NLGEOM=YES

*STATIC

MAXIMUM NUMBER OF STEPS, MAX_NUM_STEPS

*BOUNDARY

BOUNDARY CONDITIONS

*OUTPUT

OUTPUT REQUESTS

*CRITERIA, DIRECTION=MAX_PRINCIPAL, MAXIMUM, MATERIAL=MAT_NAME

*END STEP

=========================

In this modified input file, the *CRITERIA option is added to the *STEP option. This option defines the failure criteria based on the maximum principal stress in the element set specified earlier. When the maximum principal stress exceeds the value specified in the *CRITERIA option, the analysis is terminated.