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Tensile test simulation

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i am simulating tensile test on quarter model,but as the necking is done it starts expanding ,rather than failing with fracture. And the force vs strain graph also has many dipping regions, which is not close to experimental data. 

i have even use FAIL/XFEM/JOHNS Card , as recommended. kindly help.

force vs strain.JPG


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in the model you shared, the FAIL/XFEM/JOHNS was not referring to material card.  

The quarter symmetry boundary conditions were incorrectly assigned (see attached RD-T: 3500 Tensile Test Setup).

You should also consider mass and/or time scaling, as the natural timestep and the imposed velocity used would take a lot of time to solve. 

RD-T_ 3500 Tensile Test Setup.pdf

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