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The structural discontinuity can be either gross or local. Gross structural discontinuity is a region where a source of stress and strain intensification affects a relatively large portion of the structure and has a significant effect on the overall stress or strain pattern. Some of the examples are head-toshell and flange-to-shell junctions, nozzles, and junctions between shells of different diameters or thicknesses. Local structural discontinuity is a region where a source of stress or strain intensification affects a relatively small volume of material and does not have a significant effect on the overall stress or strain pattern or on the structure as a whole.

The primary bending is the component of primary stress proportional to the distance from the centroid of the solid section, and is produced by mechanical loads. This definition excludes discontinuities and concentration. The concept of bending stress is akin to the situation of beam bending, with a neutral axis along the center line with regions of tension and compression. The membrane stress is the component having a constant value through the section and represents an average value. 2 Secondary stress Secondary stress originates through the self-constraint of a structure.

The proposed limits are shown below. 1. Design condition: Pm Pm þ Pb Copyright 2005 by CRC Press, Inc. All Rights Reserved. 2 ASME Code limits. 2. Testing condition: Pm 0:9Sy Pm þ Pb 0:9 Sy ; forPm P m þ Pb ½ð0:9 þ0:1 À Þ=ð1 À ފSy À ½ð À 1Þ=ð1 À ފPm for 0:67Sy Pm 0:67Sy ð4:12Þ 0:9Sy 3. 2Sm or Sy. The value of is 1/ for full sections identified as ones for which no abrupt changes in boundary occur. Copyright 2005 by CRC Press, Inc. All Rights Reserved. 75 The procedure for obtaining and will be discussed later.

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