Indicates the out-of-plane sustained stress index (Io) value.
Specify this value for any point in the piping system by selecting the SIFs & Tees on the Classic Piping Input Dialog. Type the node number to which the stress index applies. Then, specify the Out-Plane Index (io) value on the SIFs/Tees auxiliary tab.
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For more information on stress intensification factors (SIFs), see Stress Intensification Factors and Stress Indices Details.
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For more information on using local coordinate systems to define in-plane and out-plane, see Tee Elements and Stress Intensification Factors (SIFs) in CAESAR II Local Coordinate Definitions.
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If you do not specify a value for In-Plane Index (Ii), CAESAR II uses B31J values, which most codes consider "more applicable data" for calculations. If B31J data is not available for B31.3 and some other piping codes, the software sets the value to the greater value of either 0.75 multiplied by the In-Plane SIF value (ii) or 1.0.
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B31J contains special provisions for calculating the sustained stress index (SSI).