Discussion on the opening size of elliptical and oblong holes
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In clause 6.1.2 of HG/T20583-2020, when an oblong or elliptical hole is made in the cylinder or cone and its minor axis is aligned with the radial direction of the cylinder or cone, the size of the hole is determined based on the minor axis of the oblong or elliptical shape. This calculation method differs from that in GB150; the calculated opening size is significantly smaller. Although the longitudinal stress on the cylinder or cone is clearly less than the circumferential stress, this does not conform to GB150. Can this regulation be used for calculations? Please discuss.
Generally, the applicability of hole-opening regulations depends on the specific project conditions and the particular requirements for the holes. The differences in calculations between HG/T20583-2020 and GB150 may be due to the different operating conditions or parameters taken into account when dealing with openings in cylinders or cones. In the HG/T20583-2020 standard, for oblong or elliptical openings in cylinders or cones, when the short axis of these openings is aligned with the radial direction of the cylinder or cone, the size of the opening is determined based on the short axis of the oblong or elliptical shape. Such a provision is likely intended to avoid local stress concentration caused by the openings when the cylinder or cone is subjected to circumferential stress. For GB150, other factors such as the type of openings and the operating environment of the cylinder or cone may be taken into consideration; therefore, its calculation method differs from that of HG/T20583-2020. Therefore, whether to use the provisions in HG/T20583-2020 for calculations needs to be determined based on the actual project requirements and conditions. If you encounter this situation in engineering, it is recommended that you consult professionals or institutions in the relevant field for detailed analysis and guidance. .
This post was last edited by shangrenhc on 2023-10-21 at 10:26. There is an old saying: Adapt to local customs. The design method adopted is GB/T150, and the calculation method for equal-area reinforcement is used; where specific requirements are stipulated, those shall be followed – for example, as per clause 6.3.3.1 of GB/T150.3-2011. If another method is chosen, such as the analytical method, it should be applied accordingly.