本文件规定了一种评估屈曲载荷的方法，该方法: a)考虑液压缸的几何模型，这意味着它不将液压缸视为等效柱， b)可用于表2中规定的所有类型的气缸安装和杆端连接， c)包括由执行计算的人设定并与计算结果一起报告的安全系数k， d)考虑可能的离轴载荷， e)考虑了液压缸的重量，这意味着它不会忽略施加在液压缸上的所有横向载荷， f)可以实现为简单的计算机程序，并且 g)认为圆柱体完全伸展。 规定的方法基于弹性屈曲理论，适用于符合ISO 6020（所有部件）、ISO 6022和ISO 10762的单作用和双作用气缸。如有必要，可使用有限元分析来验证和确定屈曲载荷。 该方法不适用于薄壁气缸、双杆或柱塞气缸。 该方法不是为内部（杆）屈曲开发的。 不考虑球面轴承的摩擦。 注意这种方法主要基于Fred Hoblit的原创工作[2]。该方法已参考标准NFPA/T3.6.37[1]建立。

This document specifies a method for the evaluation of the buckling load which: a) takes into account a geometric model of the hydraulic cylinder, meaning it does not treat the hydraulic cylinder as an equivalent column, b) can be used for all types of cylinder mounting and rod end connection specified in Table 2, c) includes a factor of safety, k, to be set by the person performing the calculations and reported with the results of the calculations, d) takes into account possible off-axis loading, e) takes into account the weight of the hydraulic cylinder, meaning it does not neglect all transverse loads applied on the hydraulic cylinder, f) can be implemented as a simple computer program, and g) considers the cylinder fully extended. The method specified is based on the elastic buckling theory and is applicable to single and double acting cylinders that conform to ISO 6020 (all parts), ISO 6022 and ISO 10762. If necessary, finite element analyses can be used to verify as well as to determine the buckling load. The method is not developed for thin-walled cylinders, double-rods or plunger cylinders. The method is not developed for internal (rod) buckling. The friction of spherical bearings is not taken into account. NOTE       This method is based mainly on original work by Fred Hoblit^[2]. This method has been established in reference to the standard NFPA/T3.6.37^[1].