Abstract
This paper analyses the influence that the type of geometry used to obtain the stress/strain fields in a cylindrical contact has on fretting fatigue life predictions. In addition, this work considers the effect that the fatigue crack shape assumed has on these fretting fatigue life predictions. The strain/stress fields are calculated using a series of finite elements models that consider the following three types of behaviour: plane stress, plane strain (2D geometries) and 3D. Each of these models gives a different crack initiation life and a different evolution of the stress intensity factor (SIF), which are calculated using the weight function method. These models therefore provide different fretting fatigue life predictions. Finally, the lives obtained using the numerical models are compared with experimental lives.
Highlights
Fretting is a superficial damage phenomenon that is found in certain mechanical joints when are subjected to fluctuating loads
This paper analyses the influence that the type of geometry used to obtain the stress/strain fields in a cylindrical contact has on fretting fatigue life predictions
This work considers the effect that the fatigue crack shape assumed has on these fretting fatigue life predictions
Summary
Fretting is a superficial damage phenomenon that is found in certain mechanical joints when are subjected to fluctuating loads. If there is a bulk tension at the joint in addition to the contact stress field, surface cracks may cause mechanical failure at the joint [2] This phenomenon is referred to as fretting fatigue. With the research aim of predicting the failure of mechanical components, a series of fatigue life prediction models have been developed [6-10] In many circumstances, these models are applied to geometries and load systems whose behaviour can be assumed to be in plane stress or plane strain conditions, as observed in 2D models with actual 3D geometries. The focus of this work is to analyse the effect produced by the geometry of the model (2D or 3D) on fatigue life prediction For this task, fatigue life predictions were completed over a series of experimental tests, considering both 2D and 3D models.
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