Specifies the long-term axial stress at 1:1 stress ratio. According to ISO 14962 2005, hoop stress has the same value as that for axial stresses at a 1:1 stress ratio, that is hl(1:1)=al(1:1). However, CAESAR II allows you to type different values for al(1:1) and hl(1:1) for a generalized failure profile. In this case, CAESAR II displays a warning message in the Error Checker.
Typical units (depending on your unit system):
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lb/in2
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KPa
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N/mm²
If you do not define al(1:1) and hl(1:1), the software uses a simplified envelope for plain pipe.