Article
Engineering, Mechanical
I. Llavori, A. Zabala, J. Mendiguren, X. Gomez
Summary: This study presents a coupled 3D wear and fatigue numerical procedure for fretting problems in ultra-high strength steel wires. Experimental campaigns were conducted to assess fretting fatigue lifetime, and the numerical results showed good agreement with the experimental results. The study provides a 3D numerical methodology to study the combined effects of wear and fatigue in fretting, with a case study in ultra-high strength steel wires.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Zhenjie Teng, Haoran Wu, Zhiyong Huang, Peter Starke
Summary: A study was conducted on high carbon chromium GCr15 steel through very high cycle fretting fatigue tests using an ultrasonic fatigue system, revealing that fretting reduced fatigue strength and the presence of mean stress could exacerbate this situation. Models were proposed based on morphologies observed by scanning electron microscope, defining specific regions on the fracture surface, analyzing the formation of fretting fatigue cracks, and studying how fretting and mean stress affected crack propagation post-crack formation.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Sebastien Montalvo, Siegfried Fouvry, Michael Martinez
Summary: This study investigates the effects of displacement amplitude on fretting fatigue damage using a crossed wires set-up. The results confirm the beneficial effect of wear in the gross slip regime, which reduces contact stresses by extending the contact area. To overcome the computational limitations of using a classical FEM strategy, a hybrid analytical-numerical strategy is developed to efficiently simulate contact geometry modifications.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Denny Knabner, Sven Hauschild, Lukas Sucny, Sebastian Vetter, Erhard Leidich, Alexander Hasse
Summary: The lower fretting-fatigue strengths compared to plain fatigue strengths is a significant characteristic in strength assessments of component connections. This is due to the additional tribological stress caused by contact pressure, slip amplitude and material pairing. A double-actuated flat-pad test bench is used to analyze these variables separately. The study focuses on steel materials commonly used in shaft-hub connections. The proposed local approach, based on the FKM guideline, considers fretting factors to ensure fail-safe design in fretting fatigue cases.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Lang Zou, Liantao Lu, Yabo Li, Kai Yang, Hai Zhao, Yihui Dong, Dongfang Zeng
Summary: In this study, fretting fatigue experiments for scaled railway axles were extended from the high cycle (HC) regime to the very high cycle (VHC) regime. The experimental investigation found that the fretting fatigue strength of railway axles in the VHC regime decreased with an increase in the number of test cycles. The developed evaluation method in the numerical study can provide a reasonable estimation of the occurrence of fretting crack initiation in the VHC regime.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Metallurgy & Metallurgical Engineering
Bin-bin Zhou, Peng Yu, Le Chang, Chang-yu Zhou, Cheng Ye, Bo-jun Zhang
Summary: The low cycle fatigue behavior of zirconium-titanium-steel composite plate under symmetrical and asymmetric stress control was studied. The effects of mean stress and stress amplitude on cyclic deformation, ratcheting effect and damage mechanism were discussed. The results showed that under symmetric stress control, forward ratcheting deformation was observed, while under asymmetric stress control, ratcheting strain increased rapidly with increasing mean stress and stress amplitude. The findings also revealed that stress amplitude mainly promoted fatigue damage, while mean stress led to ratcheting damage. Fractographic observation indicated that the crack originated at the interface of the brittle metal compound and the steel exhibited higher resistance to crack propagation. Furthermore, a high-precision life prediction model based on mean stress and stress amplitude was proposed.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Engineering, Mechanical
I. M. Matos, J. A. Araujo, F. C. Castro
Summary: This study conducted fretting fatigue tests on AA1120 wires and compared them with AA1350 and AA6201 wires. The results showed that AA1120 wires had longer lives than AA1350 wires in axial fatigue tests, but had similar fatigue strengths to AA6201 wires in fretting fatigue tests.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Yang Zhao, Zunyue Yu, Qianyu Wang, Xuepeng Ren, Shubin Ren, Xuanhui Qu
Summary: This study prepared near-equiatomic NiTi wires with excellent cyclic tensile fatigue life and proposed the mechanism by which deformation microstructure impacts fatigue life. The fatigue life of Ni50.2Ti49.8 was discovered to be 1.8-2.1 times greater than Ni50.9Ti49.1. Ni50.2Ti49.8 utilizes twinning, stacking faults, and wave dislocations to coordinate deformation and has a stronger pinning influence on dislocation movement, leading to extended fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Civil
He Zhu, Zhaobing Han, Cheng Liu, Yue Zhang, Wenlong Chen, Shengnan Pan
Summary: This study focuses on the contact and fretting wear characteristics of overhead power lines, considering the concealment of wind vibration and technical problems that can lead to accidents caused by wire and fitting wear. Through analysis of important parameters such as stress during frictional contact, wear morphology, and contact surface pressure during frictional wear, significant conclusions are drawn. By creating a contact mechanics model of the overhead line under wind vibration using three-dimensional modeling software, the study examines the changes in contact stress, micro-displacement, and the relationship between stress and vibration frequency. Fretting properties of adjacent conductor contact points are also calculated and analyzed, providing a mechanical foundation for understanding the wear mechanism of overhead lines.
Article
Engineering, Mechanical
Wei Song, Xuesong Liu, Jie Xu, Yu Fan, Duanhu Shi, Mohammad Reza Khosravani, Filippo Berto
Summary: The study quantified multiaxial fatigue damage for notched components or welded structures under complex service conditions. Through multiaxial Low Cycle Fatigue (LCF) tests and analysis of cyclic plasticity model, a simplified SWT model was proposed for LCF assessment of notch specimens, showing good agreements between predictions and test data.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Mechanics
Adrian Tola, Matthew R. Eatherton, Ioannis Koutromanos
Summary: The article discusses the cyclic inelastic strains and ultra-low cycle fatigue fracture of structural steel components under extreme loading events. Experimental tests and finite element analysis were conducted to study the local stress and deformation states of 60 circumferentially notched samples under different stress conditions. The importance of experimental tests in reliably characterizing ultra-low cycle fatigue in structural steel is demonstrated through calibration of existing criteria.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
P. H. C. Rocha, S. Langlois, S. Lalonde, J. A. Araujo, F. C. Castro
Summary: This paper proposes a new methodology for assessing the fatigue life of overhead conductors. The methodology combines global stress analysis and local fatigue damage analysis to predict critical failure regions and fatigue lives. Experimental results show the effectiveness of the methodology and its agreement with experimental observations.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Martin Nesladek, Lukas Pacetti, Jan Papuga
Summary: This paper aims to validate selected fatigue criteria by analyzing laboratory experiments on fretting fatigue. The analysis includes 11 fatigue prediction criteria that vary in the way they process stress or strain tensors, correct mean stress, or involve stress gradient correction. The selected criteria reflect engineering practice and are available in commercial fatigue solvers.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Physical
Zhanzhan Tang, Zheng Chen, Zhixiang He, Xiaomei Hu, Hanyang Xue, Hanging Zhuge
Summary: This study investigated the combined effects of high and low cycle fatigue loads on the performance of low alloy steel, identifying that prior HCF damages significantly decrease LCF life. The research also found that pre-fatigue damages in bridge joints can lead to significant increases in fatigue damages.
Article
Engineering, Mechanical
Zhen Hu, Enyuan Wang, Fuyin Jia
Summary: The study on the complex mechanical behavior and wear evolution inside steel wire rope reveals that the wear between the outer layer steel wires of core strand and outer strands is the most severe. The wear evolution process consists of a running-in stage and stable wear stage. Compared to other contact areas, the concentration of elements in the contact area between strands is higher, leading to a decrease in fatigue life.
TRIBOLOGY TRANSACTIONS
(2022)