Hi Dears

Recently, I want to know about Yield Stress Criterion.I found it in caesar help.But I think it's not clear. I can't understand those formulas. Who can help me to know it?

Specialy about these item:

S1OT=Maximum Principal Stress, Outside Top= (SLOT+HPSO)/2.0+(((SLOT-HPSO)/2.0)2+TSO2)1/2

S3OT=Minimum Principal Stress, Outside Top=(SLOT+HPSO)/2.0- (((SLOT-HPSO)/2.0)2+TSO2) 1/2

S1IT=Maximum Principal Stress, Inside Top=(SLIT+HPSI)/2.0+(((SLIT-HPSI)/2.0)2+TSI2) 1/2

S3IT=Minimum Principal Stress, Inside Top=(SLIT+HPSI)/2.0- (((SLIT-HPSI)/2.0)2+TSI2) 1/2

S1OB=Maximum Principal Stress, Outside Top=(SLOB+HPSO)/2.0+ (((SLOB-HPSO)/2.0)2+TSO2) 1/2

S3OB=Minimum Principal Stress, Outside Bottom=(SLOB+HPSO)/2.0- (((SLOB-HPSO)/2.0)2+TSO2) 1/2

S1IB=Maximum Principal Stress, Inside Bottom=(SLIB+HPSI)/2.0+ (((SLIB-HPSI)/2.0)2+TSI2) 1/2

S3IB=Minimum Principal Stress, Inside Bottom=(SLIB+HPSI)/2.0- (((SLIB-HPSI)/2.0)2+TSI2) 1/2

RPS=Radial Pressure Stress, Inside
HPSI=Hoop Pressure Stress (Inside, from Lame's Equation)
HPSO=Hoop Pressure Stress (Outside, from Lame's Equation)
SLOT=Longitudinal Stress, Outside Top
SLIT=Longitudinal Stress, Inside Top
SLOB=Longitudinal Stress, Outside Bottom
SLIB=Longitudinal Stress, Inside Bottom
TSI=Torsional Stress, Inside
TSO=Torsional Stress, Outside


Thanks