【Daily Question】【Static Equipment – AC Version...Question 160】June 9, 2019 Multiple-choice questions...Essay questions
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bg14.jpg【Daily Question】【AC Version for Static Equipment...Question 160】 June 9, 2019 Multiple-choice questions...Essay questions ..................................................... Reward rules: 3 Wealth for participation, 5–10 Wealth for answers that are close to the correct ones. ........................................................................... Why are straight edges designed for elliptical end caps? --------------------- Answer: (1) It reduces additional bending stress, facilitating the connection of cylinders; it also makes it easier to thin out the sections when there are differences in thickness. (2) Separate the edge stress from the welding stress to reduce the stress peak.
1). Avoid overlapping the ring weld joint between the head and the cylinder with the area subject to edge stress. Not only can defects exist in the ring weld, but welding residual stresses are also inevitable; if these stresses overlap with the edge stress, it results in very unfavorable loading conditions； 2). From a manufacturing perspective, having straight edges also facilitates welding ；
(1) Reduces additional bending stress, facilitating cylinder connection, and makes it easier to thin the material when there are differences in thickness. (2) Avoid stress concentration to prevent intergranular corrosion.
First, consider the level of processing and manufacturing of the head. Second, ensure that the additional bending stress resulting from the extra bending moment at the junction between the cylinder and the head does not overlap with the residual welding stresses in that area.
Eliminate edge stress on the straight edges of the head, ensure the welding quality between the head and the cylinder, and reduce stress concentration in the welds
(1) Reduces additional bending stress, facilitating cylinder connection, and makes it easier to thin the material when there are differences in thickness. (2) Separate the edge stress from the welding stress to reduce the stress peak.
The elliptical head is composed of half an ellipsoidal surface and a short cylinder; the straight-edge section serves to prevent a sudden change in the radial curvature radius at the weld joint between the head and the cylinder, thereby improving the stress conditions on the weld