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A new algorithm for fatigue life assessment of automotive safety components based on the probabilistic approach: The case of the steering knuckle
, Article Engineering Science and Technology, an International Journal ; Volume 23, Issue 2 , 2020 , Pages 392-404 ; Sharif University of Technology
Elsevier B.V
2020
Abstract
In the present paper, the author has attempted to examine fatigue life of automotive safety components under axial variable amplitude loading conditions. To this end, the time components of stress tensor in the critical area of the knuckle and Liu-Zenner criterion were used to calculate the time history of equivalent stress. Then, the probability distribution function (PDF) of stress was extracted by applying the stress level counting technique. The Fourier curve fitting method was employed in order to formulate the PDF. Subsequently, the fatigue life of the component was estimated using the probabilistic approach. Finally, the results of the higher order of Fourier curve fitting and...
Fatigue life analysis of automotive cast iron knuckle under constant and variable amplitude loading conditions
, Article Applied Mechanics ; Volume 3, Issue 2 , 2022 , Pages 517-532 ; 26733161 (ISSN) ; Souri, K ; Bayat, A. G ; Jabalbarez, R. S ; Ahmad, M ; Sharif University of Technology
MDPI
2022
Abstract
The main aim of the present paper is to assess the fatigue lifetime of ductile cast iron knuckles as one of the critical components of an automotive steering system. To this end, a real driving path, including various maneuvers, such as acceleration, braking, cornering, and moving on various types of road roughness, was considered. Different load histories, which are applied on various joints of the component (i.e., lower control arm, steering linkage, and Macpherson strut), were extracted through Multi-Body Dynamics (MBD) analysis of a full vehicle model. The achievements of previous studies have proved that the steering knuckle fails from the steering linkage and due to the rotational...
Experimental accuracy assessment of various high-cycle fatigue criteria for a critical component with a complicated geometry and multi-input random non-proportional 3D stress components
, Article Engineering Failure Analysis ; Volume 90 , 2018 , Pages 534-553 ; 13506307 (ISSN) ; Farrahi, G. H ; Shariyat, M ; Ahmadian, M. T ; Sharif University of Technology
Elsevier Ltd
2018
Abstract
In the present paper, a steering knuckle of a passenger car that serves as a highly critical component from the safety point of view, is considered to evaluate accuracy some of categories of the multiaxial fatigue criteria, through comparing their predictions with the experimental results. This component is subjected to the highest road- and steering-induced random and non-proportional loads that are exerted on several points of the component. The mechanical properties and fatigue strengths are determined experimentally and the fatigue life assessment tests are performed by the authors. Quantometric analyses and scanning electron microscope (SEM) have been employed to detect the failure...
Experimental and Finite Element Analysis of Vehicle Steering Knuckle Fatigue Life under Road Driving Test
, M.Sc. Thesis Sharif University of Technology ; Farrahi, Gholamhossein (Supervisor)
Abstract
Steering Knuckle is a mechanical part in an automobile which connects the break, suspension system, hub, and steering system to the chassis. In the recent years due to the variant imposing forces on the steering knuckle this part’s fatigue life has attracted engineers and designers’ attention. The considered steering knuckle in this project is a steering knuckle from an Iranian car. The goal of this project is to determine the fatigue life of a steering knuckle under street loads. The fatigue life of a steering knuckle has been investigated with both experimental and finite element methods. In order to perform the fatigue test a test fixture was designed. The finite element analysis consists...