动静态扭矩为何有差别

Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,如何在一个连接件上测量扭矩,动态扭矩,:,在拧紧螺栓的同时用在线式扭矩传感器测量,静态扭矩,:,安装后用扭矩扳手测量,软连接静态扭矩较动态扭矩要偏小，原因是衰减。,VDI2230,里系统的方法设置螺拴即有计算扭矩衰减这一步骤,计算步骤,R4,确定预加负荷损失,losses.,由于局部嵌入和不同的热膨胀特性，螺拴预加负荷可能会损失,Aluminium Joint,Steel Bolt,均值,标准偏差,(Sigma),3 Sigma,装配手测,(,动态,)(,静态,),100.2 88,100.5 84,100.7 92,100.3 86,100.4 90,100.8 88,100.5 86,100.2 85,100.2 84,100.4 84,100.42 86.7,0.21 2.8,0.63 8.3,软连接上实测值,硬连接上由于较高的静态摩擦力，静态扭矩可比动态扭矩要高。右下图中倒,V,的拐点即是扭力扳手测得的硬连接上的静态扭矩,硬连接上的扭矩实测值,动力工具,输出扭矩,92,94,91,92,94,92,92,X=92,43,=1,13,扭力扳手,静态扭矩,103,106,103,100,100,103,100,X=102,14,=2,27,T (Nm),时间,20,40,60,80,100,110,120,(A),工具输出,(,动态扭矩,),(B),扭力扳手,(,静态扭矩,),原因,:,静态摩擦力,装配手测,(,动态,)(,静态,),102.6 112,102.6 110,101.4 111,101.2 110,102.4 113,100.9 109,102.1 110,102.4 111,101.0 113,101.8 112,101.84 111.1,0.67 1.4,2.01 4.1,均值,标准偏差,(Sigma),3 Sigma,硬连接上另一实测值,We are committed to your superior productivity throughinteraction and innovation.,通过互动与创新，我们承诺您实现卓越生产力。,9,