Characteristics Of A Bolted Joint With A
Shape Memory Alloy Stud
Author(s)
N. Ould-Brahim, A.-H. Bouzid & V. Brailovski
Abstract
Creep is an important factor that contributes to the load loss and tightness failure
of bolted joints. Retightening of the joint can be expensive, time consuming and
therefore is an undesirable solution. Currently most efforts are focussed on
reducing load losses directly by tightening to yield, improving material creep
properties or making joints less rigid. An alternative solution of current interest
is the use of bolts in shape memory alloy (SMAs). However, very few
experimental studies are available that demonstrate its feasibility. The objective
of this study is to exploit the benefit of the shape memory and superelasticity
behaviors of a SMA stud to recover the load losses due to creep and thermal
exposure of a gasket in a bolted joint assembly. This paper explores several
avenues to investigate and model the thermo-mechanical properties of a bolted
joint with a Nickel-Titanium SMA stud. A stiffness-based analytical model
which incorporates the Likhachev model of SMA is used as a representation of
an experimental bolted joint assembly. Using this model the rigidity of the
experimental setup is optimized to make the best use of the SMA properties of
the stud. This theoretical model is validated by a Finite Element (FE) Model
using a custom FE material model which also implements the SMA material
model. Finally an experimental test bench with an optimized stiffness derived
from analytical simulations is used, with and without gaskets to demonstrate the
ability of the SMA stud to recover load losses.
Keywords: shape memory alloys, bolted joints, creep, superelasticity, SMA.
1 Introduction
Load losses due to creep in any bolted joint can be problematic, even small creep
losses of 0.1mm, can cause a total loss of bolt load. Several methods are in use to
Keywords
shape memory alloys, bolted joints, creep, superelasticity, SMA
Related Book
Other papers in this volume
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