/FAIL/NXT - Forming Limit Diagram based on Stresses
Description
Describes the forming limit based on stresses.
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fail_ID |
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In this example material LAW32 with /FAIL/NXT is used. The curve of upper limit for fracture (3D mode) is scaled with /MOVE_FUNCT.
#RADIOSS STARTER #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----| /UNIT/1 unit for mat Mg mm s #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----| #- 2. MATERIALS: #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----| /MAT/HILL/1/1 void_steel # RHO_I 7.8E-9 # E NU 210000 .3 # A EPSILON_0 n EPS_max SIGMA_max 582 0.009 .258 0 0 # EPS_DOT_0 m 0 0 # r00 r45 r90 Iyield0 1.0 1.0 1.0 0 #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----| /FAIL/NXT/1/1 # fct_ID1 fct_ID2 Ifail_sh 100 101 1 #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----| #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----| /FUNCT/100 SR-mode # X Y -1.2 1.2 -1 1.3 -0.8 1.36 -0.6 1.42 -0.4 1.47 0.2 1.5 0.4 1.45 0.6 1.33 1 1.5 1.5 1.85 2 2.25 2.5 2.55 #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----| /FUNCT/101 3D-mode # X Y -1.3 1.35 -1.1 1.6 -0.9 1.9 -0.7 2.2 -0.5 2.55 -0.3 2.85 -0.1 3.15 0 3.2 0.3 3.15 0.7 2.95 1.1 2.7 1.3 2.65 1.5 2.7 1.9 2.8 2.3 2.95 2.7 3.1 3.1 3.2 /MOVE_FUNCT/101 scale for 3D-mode # Ascalex Fscaley Ashiftx Fshifty 0 2.0 0 0 #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----| #ENDDATA /END #---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----| |
According to the value of f , the status for fracture is: Free: if 0 < f < 1 Warning: if 1 < f < 2 Danger: if f > 2. In this case, the element failed. In this case, f is set equal to 2.
where, and are the two current principal stresses.
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