Journal ArticleDOI
Effect of slid-roll ratio on the contact fatigue behavior of sintered and hardened steels
TLDR
In this article, Sintered and hardened steel rollers were mated against the hardened wrought tool steel roller at different slide-roll ratios and contact stresses and failed surfaces were analyzed using the optical microscope.Abstract:
Powder metal processed gears and bearings find increasing application in automotive and other engineering industries. Failure of these machine elements is mostly due to the presence of sliding action in addition to the prevailing rolling action during transmission of motion and power. This rolling-sliding contact fatigue behavior of sintered and hardened steel rollers was investigated using a test machine designed and developed in the laboratory. Sintered and hardened steel rollers were mated against the hardened wrought tool steel roller at different slide-roll ratios and contact stresses. Contact stress versus number of cycles-to-failure data was generated under drop lubrication conditions. An increase in slideroll ratio significantly affected the life of the rollers at all contact stress levels investigated. Failed surfaces were analyzed using the optical microscope. Significant peeling-type failure was observed in the specimens tested, but no marked difference in the failure appearance was noted due to the introduction of traction forces.read more
Citations
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Journal ArticleDOI
An accuracy degradation analysis of ball screw mechanism considering time-varying motion and loading working conditions
TL;DR: In this article, a new wear prediction model of BSM is introduced considering complex working conditions, and a loading model is established to describe the dynamic contact force between the ball and the raceway.
Journal ArticleDOI
Dry sliding friction and wear characteristics of Fe–C–Cu alloy containing molybdenum di sulphide
TL;DR: In this article, an attempt is made to develop molybdenum di sulphide added iron-copper-carbon sintered steels using simple single stage compaction and sintering elemental powders.
Journal ArticleDOI
Microstructure, strength and tribological behavior of Fe-C-Cu-Ni sintered steels prepared with MoS2 addition
S. Dhanasekaran,R. Gnanamoorthy +1 more
TL;DR: In this article, a simple wear model is proposed to predict the wear loss in these composites, and the model predicts wear loss values that are in agreement with the experimental data, but the model is limited to the case of Fe-C-Cu-Ni alloys with solid lubricant.
Journal ArticleDOI
The kinematics of ball-screw mechanisms via the slide–roll ratio
Jianzhong Hu,Min Wang,Tao Zan +2 more
TL;DR: In this paper, a kinematic model for the basic single arc ball screw mechanism driven by the rotation of the screw is established using the homogenous transformation matrix, and the kinematics characteristics and slide-roll ratios at contact points of the raceways are analyzed.
Journal ArticleDOI
Lumped parameters modelling of the EMAs’ ball screw drive with special consideration to ball/grooves interactions to support model-based health monitoring
TL;DR: This paper is focused on the development of a high-fidelity dynamic model of the ball screw component of flight control electro-mechanical actuators, which can represent the roll/slip transition in the spheres/grooves contact points depending on dynamic operative conditions.
References
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Journal ArticleDOI
Stresses Due to Tangential and Normal Loads on an Elastic Solid With Application to Some Contact Stress Problems
J. O. Smith,Chang Keng Liu +1 more
Proceedings ArticleDOI
The influences of Porosity on the Characteristics of Sintered Materials
TL;DR: In this article, the causes of the presence of pores dans les materiaux frittes have been studied, analysing des mecanismes de densification and obtention des lois correspondantes entre la pression appliquee and la porosite des produits obtenus.
Journal ArticleDOI
Effect of Density on Tensile Strength, Fracture Toughness, and Fatigue Crack Propagation Behaviour of Sintered Steel
Norman A. Fleck,R.A. Smith +1 more
TL;DR: In this paper, the tensile strength, fatigue crack propagation behavior, and fracture toughness of a low-alloy sin tered steel were determined for the porosity range 11-17%.
Journal ArticleDOI
Effects of oil hydraulic pressure on surface crack growth in rolling/sliding contact
Motohiro Kaneta,Y. Murakami +1 more
TL;DR: In this paper, a pair of transparent discs containing a hole or a surface crack produced artificially on the disc surface were compared with predictions by numerical analyses based on fracture mechanics, and the experimental results verified several important theoretical predictions on crack growth under rolling and/or contact conditions.
Journal ArticleDOI
Surface initiated fatigue of pearlitic and bainitic steels under water lubricated rolling/sliding contact
P. Clayton,X. Su +1 more
TL;DR: In this paper, the rolling contact fatigue behavior of steels that are, or could be, used for railroad rails is reviewed. Butler et al. employed the type of cracks observed in service rails to study the effects of maximum Hertzian contact pressure and slide/roll ratio on fatigue performance under water lubricated conditions.