指定弯头或三通的面内应力增大系数。
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。键入施加应力的节点编号。然后在 SIF/三通标签页中指定 面内应力增大系数（In-Plane SIF， ii) 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 SIF (ii) and Out-Plane SIF (io) boxes, the software performs code-related calculations.