Factor of Safety Calculation

- May 24, 2019 at 6:30 pm
  
  MaxineApoderado
  Subscriber
  
  When ANSYS calculates the Factor of Safety for Epoxy Carbon UD (230 GPa) Wet what variables does it use?
- May 24, 2019 at 8:33 pm
  
  jj77
  Subscriber
  
  For steel (ductile) the safety factor (from stress tool) is yield stress/largest VM stress in model.
  
  So say yield is at 250 MPa and the largest stress is 20 MPa, then that will give a SF of 12.5.
  
  Now for composite one would look at reserve factors (=1/SQRT(FI)) or failure index (FI) that are calculated say according to Tsai Hill or some other failure criteria.
  
  So use this (think it is called composite failure tool and is part of ACP/Post) for composites not the other safety factor tool (is for ductile or brittle mat.), which I tried and of course it gives an error since there is no yield stress defined for a UD carbon FRP.