応力波の入射箇所によるねじ締結体の緩みに関する研究

概要

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Experience has shown that a bolt-nut assembly system properly tightened can be loosened under vibrating load or impact. This paper experimentally investigates the loosening response of an assembly when a stress wave is transmitted from a gross area of a bolt, a face of a circular disk, or a screw thread of the thick circular disk assembly fastened by the bolt-nut unit. When a falling bar strikes the opposite side of a threaded rod fastened to the circular disk, or a falling circular pipe collides with the circular disk or with the anvil attached to the end of a screw, a stress wave propagating from the collision interface is transmitted into the assembly. The axial stress of a bolt tightened by a hexagonal nut in conjunction with a plain washer is measured, while a number of incident waves are impinged into the assembly. The shift of axial stress due to the stress wave transmitted from the portion of the screw thread is the largest. The cause of the loosening is investigated by observing the stress waves transmitted into the circular disk assembly system.
一般社団法人日本機械学会の論文
1998-06-25