Specifies the long-term hoop stress for a partially restrained hydraulic (R_test) condition.
Typical units (depending on your unit system):
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lb/in2
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KPa
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N/mm²
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For information on failure envelope points, see Figure B.1 of ISO 14692-2:2017.
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If you do not specify a value for h_R and a_R then the software uses a simplified failure envelope based on other defined envelope points: al(0:1), al(2:1), and hl(2:1).
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The value of h_R must be less than the value of hl(2:1).