当安全销横截面上的切应力达到其极限值时,销 钉被剪断,即剪断条件为 F F As Td/4 解得 4F =0.0153m=15.3m CT当安全销横截面上的切应力达到其极限值时，销 钉被剪断，即剪断条件为 2 u S S S π / 4  = = = d F A F 解得 0.0153m 15.3mm π 4 u S = = =  F d