6.1 Smeared Cracking

Cracking is specified as a combination of tension cut-off, tension softening and shear retention. Cracking cannot be combined with orthotropic material. See §18.1 for background theory of cracking in DIANA. The following are some instructive examples of input data for crack models.

    (file.dat)

'MATERI'
   1  CRACK  1
      CRKVAL 3.
      TAUCRI 1
      BETA   0.03
      TENSIO 1
      TENVAL 0.00333

Constant stress cut-off. Constant shear retention. Linear tension softening, f_t = 3 N/mm² , G_f = 0.05 N/mm , h = 10 mm .

    (file.dat)

'MATERI'
   2  TENSIO 2
      TENVAL 3. 0.  1. 0.00133  0. 0.006  0. 100000.

Bilinear tension softening, f_t = 3 N/mm² , G_f = 0.05 N/mm , h = 10 mm . Diagram Hillerborg, breakpoint at ${\tfrac{{1}}{{3}}}$f_t and ${\tfrac{{2}}{{9}}}$$\varepsilon_{{\mathrm{u}}}^{}$ . The last branch must also be specified.

    (file.dat)

'MATERI'
   3  TENSIO 5
      TENVAL 3. 0.05 10.

Nonlinear tension softening according to Hordijk et al., f_t = 3 N/mm² , G_f = 0.05 N/mm , h = 10 mm .

    (file.dat)

'MATERI'
   4  TENSIO 1
      TENVAL 0.0019

Linear tension stiffening, $\sigma_{{\mathrm{y}}}^{}$ = 400 N/mm² , E_steel = 210000 N/mm² .