Considering the start of the cracks in the middle of the sample and the acts boundary conditions on both sides of the strain stress curve for composite It is linearly drawn up to the point of initial submission and then with a positive slope reaches the maximum amount of tolerable stress and the composite portable section due to the concentration of cracks and the increase of the width of the cracks It leads to failure. The estimated coefficients in the damage model concrete plastics have been applied with good approximation. The results of the linear strain of the experimental results are the same but there is an error in the nonlinear region. Is the problem of the parameters of plastic damage to concrete or suggest another model?
Dear Mohammad Safari,
I tried to reproduce the material behaviour of concrete in my simulation by using measured values of the 4-point-bending experiment - including the softening ; this way the uncertainty of the material behaviour should be minimized. Of course there are small deviations because of the smeared modelling (bending strength and young's modulus). Additional the support conditions need to be calibrated.
So the softening of the material is not just defined by a theory e.g. exponential softening - the simulated material behaviour should be pretty close to the experimental reality. (see figure 5)
Please find here an abstract concerning my nonlinear simulation in Ansys: https://tu-dresden.de/zih/hochleistungsrechnen/hpc-monat?set_language=en
or here the pre-print:
Preprint Modeling the stiffness degradation of concrete based on phys...
All other documents could be found here: (CC-technology) https://www.researchgate.net/profile/Juergen_Ries
Dear Jürgen
Thank you so much for sharing your experience with me. I studied your activities. It seems that the tensions that determine the size of yield and failure levels are very important. I'll solve this problem with new solution (implicit solver).
Best regards
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