联接螺栓一般需要预紧到使用载荷的75～80％,根据经验,这个预紧量对多数联接来说是适用的。但有些联接,外加拉伸载荷可使螺栓锁紧力减少到零,对这些联接来说,预紧力就不是75％或80％,而应更高些。在螺栓和被联接零件的弹性极限内,使锁紧力减少到零时的外加载荷值,可由下式计算: 使被联接零件不产生间隙所能承受的最大载荷也可由这一公式算出。因为只要定出公用γ值,最大载荷就可以据上面公式为基础绘制 Bolts generally require a preload of 75 to 80% of the used load. As a rule of thumb, this preload is suitable for most applications. However, some joints, combined with tensile loads, can reduce the bolt locking force to zero, and for these joints, the preload is not 75% or 80%, but should be higher. The value of the applied load when the tightening force is reduced to zero within the elastic limits of the bolt and the part to be joined is calculated from the following formula: The maximum load that can be applied without any play to the part being joined can also be calculated from this formula. Because as long as set the common γ value, the maximum load can be drawn on the basis of the above formula