Hi

I am trying to model FRP strands inside Prestressed Concrete.

i wrote a UMAT code for defining Constitutive law for FRP.

The linear analysis runs fine, however, after defining CDP I am getting sudden change in stresses as shown in Image.

Note that FRP strands have been defined Linear always as strands are not suppose to go non-linear during Analysis.

What could be the possible reason for this ?

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