Abstract

Bolted joints tend to loosen under dynamic loads. Plain and spring washers are most common to control loosening. Initial tightening torque applied on the joint, at the time of assembly, also plays an important role. It is also known that bolts with shanks snugly fitting in the hole help in the control of loosening. In the present study comparison of plain and spring washer with the case of using no washer, and comparison of the bolt with plain shank with full-threaded bolt have been carried out. The result shows that plain washer is slightly effective to prevent loosening than that of spring washer with a threaded bolt. Whereas, the combination of Plain washer and bolt with plain shank is most effective. It shows that use of plain washer significantly controls loosening, under the three initial tightening conditions of the joint 20% under-tightened, 10% under-tightened and tightened up to rated torque.

摘要

螺栓接头在动态负载下容易松动。平垫圈和弹簧垫圈最常用于控制松动。组装时施加在接头上的初始紧固扭矩也起着重要作用。众所周知，带有紧贴在孔中的杆部的螺栓有助于控制松动。在本研究中，对平垫圈和弹簧垫圈与不使用垫圈的情况进行了比较，并对平柄螺栓与全螺纹螺栓进行了比较。结果表明，平垫圈在防止松动方面比带螺纹螺栓的弹簧垫圈稍微有效。然而，平垫圈和带平杆的螺栓的组合是最有效的。结果表明，使用平垫圈可显着控制松动，