A MECHANICAL ENERGY APPROACH TO PREDICT FRETTING-WEAR DAMAGE IN NUCLEAR COMPONENTS


11th International Conference on CANDU® Maintenance and Nuclear Components - 2017 Oct. 01-04

Presented at:
11th International Conference on CANDU® Maintenance and Nuclear Components
2017 Oct. 01-04
Location:
Toronto, ON Canada
Session Title:
Integrity of Structures and Components

Authors:
M. Pettigrew (Ecole Polytechnique Montreal)
M. Yetisir (Canadian Nuclear Laboratories)
N. Fisher (Canadian Nuclear Laboratories)
B. Smith (Canadian Nuclear Laboratories)
C. Taylor (Canadian Nuclear Laboratories)
V. Janzen (Canadian Nuclear Laboratories)
  

Abstract

ABSTRACT Fretting-wear damage between a vibrating structure and its supports is discussed in this paper. Typical components of concern are piping systems and pipe-supports, heat exchanger tubes and tube supports, and nuclear fuel bundles and fuel channels. Fretting-wear damage is related to the dynamic interaction between a structure and its supports. This interaction is conveniently formulated in terms of a parameter called “work-rate” to predict fretting-wear damage. Work-rate is simply the integral of contact force over sliding distance per unit time. Fretting-wear damage may be investigated from an energy point of view. It is essentially the mechanical energy or power dissipated through contact forces and sliding that causes fretting-wear damage. Development of a simple formulation that relates tube vibration response and fretting-wear damage is presented in this paper. Several practical examples and simple calculations are discussed.

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