Numerical modelling of fretting fatigue

Abstract

Abstract. Fretting fatigue is a consequence of small oscillatory movement between two contacting parts. This type of damage may give rise to significant reduction in fatigue life of the components. Many parameters such as contact geometry, contact load, friction, material strength and hardness can influence the resistance of materials against fretting damage. Experimental study of fretting fatigue parameters such as crack length measurement at the initial stages of crack growth is either very difficult or not very accurate. Numerical simulations provide a suitable tool for parametric study of fretting fatigue behavior of materials and in particular crack growth measurement. In this work, the effect of pad geometry on crack propagation is investigated by numerical simulation. The simulations are carried out using the finite element codes ANSYS and FRANC2D/L and are validated by the results of some fretting fatigue tests. It is shown that the simulations can predict the crack growth and the number of cycles from the principals of fracture mechanics.

An applied approach for estimating fretting fatigue lifetime of dovetail joints using coupon scale test data

“…where N is the number of fatigue cycles which lead to failure at a stress amplitude , while 𝜎 𝑎 𝜎 ′ 𝑓 and k are material constants. This equation can be used to calibrate Equation (12), that is, to obtain the material parameters and , by converting Equation ( 12) into a form similar to 𝜎 𝑟 𝑚 Equation ( 13):…”

“…The issue of fretting fatigue is so prevalent in fact that, the US Air Force has identified it as one of the costliest sources of in-service damage occurring to their aircraft [7]. To this end, there have been many studies in the literature focusing on understanding of different materials subjected to the fretting fatigue load conditions using advanced experimental and numerical techniques [8][9][10][11][12][13].…”

Fator de intensidade de tensão em trincas de fretting

“…Embora diversos estudos como os de TALEMI et al(2011) e BAIETTO et. al (2013 apresentem bons resultados, a complexidade envolvida no estudo de fretting faz com que os modelos normalmente representem apenas condições específicas.…”