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ASM Failure Analysis Case Histories

ASM Failure Analysis Case Histories: Rail and Rolling Stock

ASM International
ISBN electronic:
978-1-62708-231-0
Publication date:
2019
Book Chapter

Failure of a Hi-Rail Device

By
Mitchell P. Kaplan
Mitchell P. Kaplan
Willis, Kaplan & Associates, Inc.
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Published:
2019

Abstract

A hi-rail device is a vehicle designed to travel both on roads and on rails. In this case, a truck was modified to accept the wheels for rail locomotion. The rear wheel/axle set was attached to the truck frame. Both the front and rear wheel/axle sets were raised by means of a hydraulic cylinder driven off the PTO of the truck. The wheel/axle set was rigidly fixed into an up or down position by the use of locking pins. It was assumed by the manufacturer that there would be no load on the cylinder once the wheel/axle set was in its locked position. However, as the cylinder pivoted about its mounting trunnion and extended during its motion, it interfered with a frame member. This caused both a bending load and a rotational movement. These effects caused a combination of fretting, galling, and fatigue to the internal thread structure of the clevis. As a result of these deleterious effects, failure of the thread structure of the clevis occurred. The failure occurred where the cylinder rod screws into the clevis. The rod was manufactured from 1045 steel.

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Mitchell P. Kaplan, 2019. "Failure of a Hi-Rail Device", ASM Failure Analysis Case Histories: Rail and Rolling Stock

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