ABAQUS allows direct user specification of the stiffness recovery factors. The experimental observation in most quasi-brittle materials, including concrete, is that the compressive stiffness is recovered upon crack closure as the load changes from tension to compression. This requires the definition of many steps, interactions and predefined fields on changing regions in the thermal and structural model. A plug-in has been developed to simply the set-up of more complex welding models: the Abaqus Welding Interface. More on that in a later blog, to be called Welding simulation using Abaqus - Part 2.

CrackedSoftware >Zencrack >F.E. interfaces >Abaqus

Zencrack has an interface to Abaqus/Standard. A brief overview of the interface is given below.

The interface to Abaqus works via the .inp and .odb (or .dat or .fil) files:
  • An uncracked mesh must be supplied as an Abaqus .inp file. This may be generated in any suitable pre-processor.
  • Zencrack then combines the uncracked mesh with data in the Zencrack input file to create a .inp file for the cracked component.
  • The cracked mesh is submitted for analysis by Abaqus.
  • When the Abaqus analysis is completed, Zencrack extracts results directly from the Abaqus output (.odb, .dat or .fil files). The necessary results are generated via output requests that were created in the cracked mesh .inp file.

If crack growth is required, Zencrack carries out crack advancement using the results of the Abaqus analysis and generates a new .inp file for an advanced crack position. Champion sprinkler valve manual lever. The new cracked mesh is then submitted for analysis. This process is shown schematically in the Zencrack flowchart.

This interface is able to provide the following fracture mechanics parameters after processing the results from an Abaqus analysis:

  • The magnitude and direction of the maximum energy release rate, G, at each node along the crack front.
    • Calculated via data from the Abaqus *CONTOUR INTEGRAL, TYPE=J option.
    • For non-linear analysis this term is J, though it is processed in the same way by Zencrack.
  • The stress intensity factors KI, KII and KIII at each node along the crack front.
    • Calculated from nodal displacements.
    • Direction for crack growth is calculated from Ks.
    • The stress intensity factors are also converted into an equivalent energy term.
    • Equations used are only valid for linear elastic isotropic materials.
  • The stress intensity factors from the option *CONTOUR INTEGRAL, TYPE=K FACTORS can also be requested requested and their values post-processed.
  • The T-stresses from the option *CONTOUR INTEGRAL, TYPE=T-STRESS can also be requested and their values post-processed.
  • The Ct-integral can be calculated and used in a creep analysis i.e. *CONTOUR INTEGRAL, TYPE=C.

The analysis results may be post-processed using the Zencrack GUI or utility programs provided with Zencrack. These allow visualisation of crack growth profiles, xy plotting and generation of .csv files for use in a spreadsheet. In addition, all of the standard Abaqus output files are available for post-processing e.g. the .odb file. During a crack growth analysis, the standard Abaqus files can be saved after successive Abaqus analyses to allow subsequent post-processing of multiple crack positions.

Abaqus/CAE plug-ins

From Zencrack version 7.9-1 the Zencrack GUI replaces and improves upon many of the capabilities of the plug-in for Abaqus/CAE and is the recommended way to create and maintain Zencrack input files. It also provides a means to run Zencrack and to post-process the crack growth profiles. However, the plug-in retains some usefulness when partitioning a geometry as the crack front viewer can be used to display a spline or crack front position on the geometry to help in the partitioning process.

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Abaqus Welding Interface Cracked

The plug-in appears as a 'Zencrack tree' alongside the Model and Results trees and allows generation and review of a complete Zencrack input file from within /CAE or Viewer.

Welding

Abaqus Welding Interface Cracked Bandicam

Windows

Some data for the Zencrack input file is related directly to nodes and/or elements in the uncracked mesh file. By opening an odb file for the uncracked model, this data for the Zencrack input file can be picked directly from the model on the screen.

Welding

Abaqus Welding Interface Cracked Ms Office

The plug-in also contains a 'crack front viewer' option. This is primarily intended to allow definition of splines for the Zencrack user-defined initial crack front option. However, this capability is useful in other ways. For example:

  • for allowing the initial crack position to be visualised while partitioning and meshing the uncracked model
  • for displaying one or more crack positions from a growth analysis
  • for displaying (x,y,z) positions at which data is reported in a csv file when using the 'process' post-processing utility program.
A short video is available giving an example of the use of the plug-in to define a complete Zencrack input file. It includes picking of crack-block, split set, relaxation and edge data.


'Analysis options'


'Split set picker'

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'Crack front viewer'

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