Prerequisites:   Continuum Damage Mechanics: References

This example was constructed using R2022x FD02 on the public cloud.  (For R2022x the environment variable SMAMATCAL_DAMAGECALIBRATION=1 set in your Catenv file, Env.txt).

Construction of a ductile damage model in Abaqus for metals such as steel, aluminum, etc, can be thought of in several steps :

1) Create an elastic-plastic material model that is valid well past ultimate into the necking region of the deformation. This is a key ingredient, perhaps the most important step.

    a)  It is useful to begin this process by using uniaxial tensile test data up to ultimate.  This step can be accomplished quickly using the material calibration app in the 3DExperience platform. 

    b)  Use the uniaxial test data up to damage initiation to further define the elastic-plastic model.  The most common way of doing this is using an FE simulation of the test, using what is often called an inverse method.  This step can be accomplished using the FE-mode calibration in the calibration app, an example is shown here: Necking of a titanium dogbone specimen

    c)  Validate, or refine this elastic-plastic model by simulating all of the various tests that have been performed. It is well known that the damage for most metals is dependent upon the state of stress triaxiality, thus various test specimen geometries are used to understand this dependence. The failure strain may also be dependent upon the Lode angle, and perhaps the strain-rate.  Thus additional tests, with additional specimen geometries, may also be used.

CDM Step1a Create the elasto-plastic material model up to ultimate (numerical mode)

CDM Step 1b  Use FE-mode to create the elastic-plastic material model using the uniaxial test all the way to incipient failure.

CDM Step 1ab - post showing both of the above steps.

CDM Step 1c, Use all 6 test data sets to refine the elastic-plastic material model.

CDM Step 2, Calibrate the *damage initiation parameters.

CDM Step 3, Calibrate the *damage evolution parameters.

Back to: Sharing Material Test Data

Back to:  Material Modeling and Calibration - An Overview and Curriculum