I really like the DCB specimen provided in Workshop 4 of the Composites class.  This is because by being a training class workshop, the Abaqus model is explained and documented well.   This is a 2D model, using CPE4I plane strain elements for the beams and COH2D4 cohesive elements to model the adhesive bonding the beams.  There are a total of 1880 elements: 1600 in the beams (arms) and 280 cohesive elements.

This zip file below contains 11 files:

_README.docx

abaqus_v6.env         set to have no parts and assemblies output from Abaqus CAE

coh_*                        2 related Abaqus input files.  no parts & assemblies is used

COMP_W04-DCB-Cohesive.pdf      The workshop description.

dcb_*                        4 related Abaqus CAE files

ws_*                         2 related Abaqus CAE python scripts for creating models

As is often the case for workshop models, this one is set up to run quite quickly.  This is also helpful when using the Calibration app in 3DX.   However, the original model shows a fairly coarse traction-separation result due to the coarse time-stepping and the viscosity value used.   

coh_noparts_orig.inp

     0.01, 1., 1e-08, 1.0      runtime = 133 secs    422 incs, 1382 passes thru solver          

coh_noparts.inp

    0.001, 1., 1e-08, .001  runtime = 241secs    1110 incs, 2090 passes thru solver

                     Same result, just zooming in near the peak force.

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