This post is a place to share several D638 tensile dogbone Abaqus models.   Be careful, because the D638 test specification includes several geometries.

This first one is a D638 Type I specimen, with a Johnson Cook material model for AL2024-T351.  I only have the .inp file, still looking around for the original A/CAE file for this dogbone specimen.  This D638, Type I geometry is 165 mm in total length and 13mm wide in the gauge section of the specimen. This specimen is very commonly used for tensile testing of plastics, with the specimen molded, or die-cut from a compression molded or injection molded plaque. The specimen, when cut from a plaque, is typically about 3mm thick.  In the attached model, the boundary conditions use a kinematic coupling, with a resulting distance between "grips" of about 115 mm.  There is a slight nodal modification used to force necking to occur in the center of the specimen.  In order to mimic the test instrumentation, we use a connector element in the model to output the strain in the same manner as an extensometer.  We output  CU1 for a connector element called "StrainGage25", the 25 indicating it has a gauge length of 25mm.   The aluminum  material model used is taken from an online DOT/FAA paper dated September, 2000, titled : "Experimental Investigations of Material Models for Ti-6Al-4V Titanium and 2024-T3 Aluminum",   See Table 6, page 17 of the paper (you can find the paper online).  The attached .zip file contains the .inp file and a .sta file (run with Abaqus 6.14-1).

I found the .cae file, and modified it to contain 2 different models, the first model is the D638 Type I dogbone and the second model is a D638 Type V dogbone geometry.  Both models contain a polypropylene material modeled with a rate-sensitive elastic-plastic model.   The Type I dogbone model uses a kinematic coupling to apply the "grip".  The Type V dogbone model uses rigid planes as the grips, and ties these rigid planes to the dogbone surfaces.  This modeling practice is a little more visually appealing, it also makes the distance between the grips more apparent.  The Type V dogbone model is a 1/4 symmetric model.  The Type V geometry is 63.5 mm in total length and 3.18mm wide in the gauge section of the specimen. A/CAE makes it pretty easy to change the specimen dimensions (when measured dimensions are slightly different than the nominal).   For the Type V model, if you re-mesh, you will have to redefine the elset called PeakStrain, which is an elset that contains just a single element at the very center of the specimen. That elset was used to create history output for LE11, NE11 and ER11.  The attached .zip file contains a single .cae file, 2 .inp files, and 2 .sta files (run with Abaqus 6.14-1).

Do you have any D638 dogbone models you can share ?

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Edit on 5-15-2015: I have added another D638 dogbone model (zipped .inp file)