SMART Method for Crack-Growth Simulation

- March 27, 2019 at 3:51 pm
  
  HanakJiri
  Subscriber
  
  Hello,
  
  I am using SMART method in Ansys APDL for crack growth simulation. I want to ask, what SMART uses for determine the next crack growth direction. In the help section about this method, there is only stated wich condition must be fulfilled for crack to start growing and what will be the next crack extension. But there is not mention according wich theory SMART determine the crack extension direction.
  
  Is it using Sih criterion (needs K1 and K2) or something else?
  
  Thanks for reponse.
- March 29, 2019 at 3:27 pm
  
  David Weed
  Ansys Employee
  
  Hi,
  
  In the context of fatigue crack growth, the direction of the crack is determined by the interaction of KI and KII as explained here:
  
  https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v193/ans_frac/franundcgrowmech.html%23fraccgrowmechanics
- March 29, 2019 at 3:32 pm
  
  HanakJiri
  Subscriber
  
  Hello,
  
  thank you for response. I am using static crack growth, so I didnt pay much attention to the context of the fatigue crack growth. Is ansys using the same equation in case of static growth please?
  
  Thanks
- March 29, 2019 at 3:52 pm
  
  David Weed
  Ansys Employee
  
  Hi,
  
  Yes, this is valid for static crack growth as well. Instead of using delta K, we simply use static KI and KII values.
- March 29, 2019 at 4:08 pm
  
  HanakJiri
  Subscriber
  
  Great, thanks a lot! Last question, you are using the max value of KI and KII or the avarage value across the crack front?
- October 11, 2020 at 12:06 pm
  
  hoda2020
  Subscriber
  
  I used smart crack method in ansys workbench 19.2 on notched steel beam to study fatigue crack growthnI research more in this method, but I can't insert load as step applied instead of ramped appliedn
- October 20, 2020 at 8:23 am
  
  hoda2020
  Subscriber
  
  Please, any one can help men
- October 23, 2020 at 2:26 am
  
  danielshaw
  Ansys Employee
  
  SMART automatically applies the load in one substep. The specified number of substeps controls the number of solutions performed with each new crack increment.n
- October 24, 2020 at 10:38 am
  
  hoda2020
  Subscriber
  
  Thanks for your response,nI used in smart methodn1/ Methodology is. (fatigue) n2/ used (life cycle) n3/ stress ratio 0.4nWhen I insert force , as default (ramped) must be change to ( step applied) automatically( as you mean in your comment)But this don't occur, the value still as ramped not step nHow solve this problem? nIs the problem in my version of program or there's another solution?
- December 4, 2020 at 7:30 pm
  
  danielshaw
  Ansys Employee
  
  You can issue the KBC,1 command to force the load to be step applied.n