指定面内持续应力指数（Ii）的值。
在经典管道输入对话框中选中 SIF & 三通复选框，为管道系统中的任意一点指定该值。键入应用应力指数的节点编号。然后在 SIF/三通标签页中指定面内指数(Ii) 的值。
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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 in the In-Plane Index (Ii) box, CAESAR II sets the value to the greater value of either 0.75 multiplied by the In-Plane SIF value (ii) or 1.0.