Influence Of Surface Profile Research Articles

Modelling Acoustic Emissions induced by dynamic fluid-asperity shearing in hydrodynamic lubrication regime

This paper investigates the mechanism and characteristics of Acoustic Emission (AE) generated from the dynamic Fluid-Asperities Shearing (FAS) in the hydrodynamic lubrication (HL) regime. Firstly, a FAS model is derived to take into account the dynamic effect of surface asperities. Then, the influence of surface profiles, lubricants and operating conditions are illustrated on AE characteristics, i.e. magnitudes and frequency bandwidths. It has been found that the correlation length of surface roughness parameters and shear rate are two main factors affecting FAS behaviours and consequently AE characteristics. Finally, the corresponding experiments are carried out based on a rheometer rig, which validate the predictability of the model and new findings, paving the foundation for developing AE based monitoring techniques.

Effects of surface profiles on the joint formation during magnetic pulse crimping in tube-to-rod configuration

Magnetic pulse crimping is a solid state, high-speed impact crimping technique. In this paper, copper tube was successfully crimped on the steel 1020 rod. Three types of profiles threaded, knurled, and plain profile were created on the steel rod and then a copper tube was crimped on the rod. The influence of surface profiles on the joint strength, surface roughness and microstructure of the joint were analyzed and compared. Compression-shear tests as well as pull-out tests were carried out to compare the strength of the crimped joint. The result of the pull-out tests as well as compression-shear tests revealed that threaded surface profile on the steel rod gives better strength in comparison to the other two profiles. Along the circumference of the Cu-steel composite rod the microstructure images of the joints were taken and analyzed, it was found that there was no gap along the circumference of the sample crimped at 5.3 kJ of discharge energy with plain profile. For surface roughness, the Ra values of the crimped samples at 5.3 kJ were analyzed and it was found that average Ra value of the sample crimped on the threaded base was highest (0.80 μm) among threaded, knurled, and plain base samples.

Influence of Surface-profile and Movement-path of Roller on Thickness Thinning during Multi-pass Deep Drawing Spinning

Over thinning is a serious defect influencing the forming quality of spun workpiece during multi-pass deep drawing spinning. Surface-profile and movement-path of roller are the key factors influencing the thinning ratio of wall thickness of spun workpiece. The influence of surface-profile and movement-path of roller on thickness thinning were studied based on numerical simulation and experimental research, four groups of forming experiments were carried out under the combination of the different surface-profile of roller (R12 and R25-12) and movement-path of roller (spinning from the bottom of the blank and spinning from the middle of the blank). The results show that both the surface-profile and movement-path of roller have great influence on wall thickness thinning during multi-pass deep drawing spinning; and compared with the movement-path of roller, the influence of surface-profile of roller is more significant. The experimental results conform well to the simulation ones. It indicates that the FEA model established is reasonable and reliable.

0934 軸受表面プロファイルが人工関節用超高分子量ポリエチレンの摩耗に与える影響 : 第2報(OS20-1:人工関節とバイオエンジニアリング1)

0934 軸受表面プロファイルが人工関節用超高分子量ポリエチレンの摩耗に与える影響 : 第2報(OS20-1:人工関節とバイオエンジニアリング1)

Influence of surface profile on slider bearing performance

Hydrodynamic pad thrust bearings are commonly used in industries for sustaining the axial loads in machinery. Researchers have given great importance to the investigation of performance parameters of hydrodynamic pad thrust bearings for the wide range of operating conditions by using theoretical and experimental approaches. Recently, research is being focused on surface profiling of bearing surfaces and its role over the performance of fluid lubricated thrust pad bearings. Thus, the objective of this paper is to study theoretically and experimentally the performance parameters of pad thrust bearing by providing micro cycloidal surface profiling over the stationary pad. Moreover, performance parameters of pad thrust bearing achieved with cycloidal surface and conventional plane surface profiles are compared for highlighting the importance of micro-surface profiling on pad. Micro-level cycloidal surface profile is generated over the bearing pad using CNC milling machine. Based on this study, it is observed that the pressure profile generated in cycloidal surface pad thrust bearing is significantly more than conventional plane pad thrust bearing. However, temperature rise in lubricating film with both (cycloidal and plane) pad thrust bearings are almost same.

Influence of surface profile in polymer-metal contact charging

Many authors have observed in polymer-metal contact charging a linear relationship between charge density and metal work function. Obviously, measured density is apparent density because a polymer film surface is never a perfect plane. The true density is depending on the polymer surface microroughness and the applied pressure, both parameters having a large influence on the areas effectively in contact.The purpose of the present paper is to provide a contribution to the study of this phenomenon by combining classical contact charging measurement and assessment by various methods, optical or mechanical, of the polymer surface structure. A series of PET film samples having various microroughness has been used.It has been observed that, for a given pressure, a good correlation exists between charge density and surface microroughness.

Discussion: “The Influence of Surface Profile on the Load Capacity of Thrust Bearings With Centrally Pivoted Pads” (Raimondi, A. A., and Boyd, John, 1955, Trans. ASME, 77, pp. 321–328)

Discussion: “The Influence of Surface Profile on the Load Capacity of Thrust Bearings With Centrally Pivoted Pads” (Raimondi, A. A., and Boyd, John, 1955, Trans. ASME, 77, pp. 321–328)

Discussion: “The Influence of Surface Profile on the Load Capacity of Thrust Bearings With Centrally Pivoted Pads” (Raimondi, A. A., and Boyd, John, 1955, Trans. ASME, 77, pp. 321–328)

Discussion: “The Influence of Surface Profile on the Load Capacity of Thrust Bearings With Centrally Pivoted Pads” (Raimondi, A. A., and Boyd, John, 1955, Trans. ASME, 77, pp. 321–328)

Closure to “Discussions of ‘The Influence of Surface Profile on the Load Capacity of Thrust Bearings With Centrally Pivoted Pads’” (1955, Trans. ASME, 77, pp. 329–330)

Closure to “Discussions of ‘The Influence of Surface Profile on the Load Capacity of Thrust Bearings With Centrally Pivoted Pads’” (1955, Trans. ASME, 77, pp. 329–330)

The Influence of Surface Profile on the Load Capacity of Thrust Bearings With Centrally Pivoted Pads

Abstract This paper describes an analysis which reveals the significance of surface profile and its contribution to the load capacity of centrally pivoted pads. Experiments supporting the authors’ analysis are described. In addition, variable viscosity and variable density are evaluated and their effect on load capacity is noted.

Discussion: “The Influence of Surface Profile on the Load Capacity of Thrust Bearings With Centrally Pivoted Pads” (Raimondi, A. A., and Boyd, John, 1955, Trans. ASME, 77, pp. 321–328)

Discussion: “The Influence of Surface Profile on the Load Capacity of Thrust Bearings With Centrally Pivoted Pads” (Raimondi, A. A., and Boyd, John, 1955, Trans. ASME, 77, pp. 321–328)