Experimental study of thermal sliding contact parameters at interface seat of large strains

2010 ◽  
Vol 3 (S1) ◽  
pp. 821-824 ◽  
Author(s):  
B. Bourouga ◽  
E. Guillot ◽  
B. Garnier ◽  
L. Dubar
Keyword(s):  
Experimental Study ◽  
Sliding Contact ◽  
Large Strains ◽  
Contact Parameters

Development of experimental vibro-acoustic transfer function for a system with combined rolling-sliding motion

2021 ◽  
Vol 263 (5) ◽  
pp. 1505-1515
Author(s):  
Kumar Milind Rewanand Shripad ◽  
Sriram Sundar
Keyword(s):  
Transfer Function ◽  
Noise Exposure ◽  
Acoustic Pressure ◽  
Acoustic Noise ◽  
Contact Forces ◽  
Sliding Contact ◽  
Direct Technique ◽  
Cam Follower ◽  
Acoustic Transfer Function ◽  
Contact Parameters

Combined rolling-sliding contact is present in popular non-linear systems such as cam-follower, gears, clutches, and brakes. These systems produce significant noise due to complex contact between the components during operation. The noise generated is a strong function of the contact parameters and excitation to the system. The objective of this study is to develop a transfer function to quantify the vibro-acoustic noise for various contact conditions. Acceleration, reaction forces, and acoustic pressure measurements are made on a cam-follower setup with combined rolling-sliding contact. Experiments are performed under different conditions of friction, lubrication, load, and speed. Contact forces are back-calculated using the kinematics. The transfer function relating the acoustic pressure to different forces is estimated. It is observed that the contact parameters govern the transfer function and hence the vibro-acoustic systems. The developed transfer function is useful in designing better sub-systems with combined rolling-sliding contact to reduce noise exposure, as a direct technique to relate the contact parameters to the noise does not exist. This study can be extended to other complex systems such as gears and clutches.

scholarly journals The Strength of Egg Trays under Compression: A Numerical and Experimental Study

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2279
Author(s):  
Leszek Czechowski ◽  
Gabriela Kmita-Fudalej ◽  
Włodzimierz Szewczyk
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Maximum Load ◽  
Experimental Investigations ◽  
Large Strains ◽  
Strength Ratio ◽  
The Finite Element Method ◽  
Compression Stiffness ◽  
Different Shapes

This work concerns the analysis of egg packages subjected to compression. Experimental investigations were carried out to determine the curves of compression and maximum loads. To compare packages accessible on the market, several different shapes of egg packages were tested after being conditioned in air with a relative humidity of 50%. Several paper structures in stock were compressed. By validating the experiment results, numerical computations based on the finite element method (FEM) were executed. The estimations of a numerical model were performed with the use of the perfect plasticity of paper and with the assumption of large strains and deflections. Our own two structures of egg packaging were taken into account: basic and modified. The material of the packages was composed of 90% recovered paper and 10% coconut fibres. This paper involved the numerical modelling of such complex packaging. Moreover, our research showed that introducing several features into the structures of the packaging can improve the stiffness and raise the maximum load. Thanks to the application of ribs and grooves, the strength ratio and compression stiffness, in comparison to the basic tray, increased by approximately 23.4% and 36%, respectively. Moreover, the obtained indexes of modified trays were higher than the majority of the studied market trays.

scholarly journals AN EXPERIMENTAL STUDY ON THIRD-BODY PARTICLE TRANSPORT IN SLIDING CONTACT

2021 ◽  
Vol 19 (1) ◽  
pp. 001
Author(s):  
Qiang Li ◽  
Iakov A. Lyashenko ◽  
Jasminka Starcevic
Keyword(s):  
Experimental Study ◽  
Particle Transport ◽  
Tangential Force ◽  
Sliding Contact ◽  
Pure Form ◽  
Third Body ◽  
Rubber Layer ◽  
The Third ◽  
Rough Body ◽  
3D Printed

An experiment is designed to study the third-body particle transport in a rough contact. To study the influence of particles in a pure form, it is assured that the first bodies have no contact and the sliding is very slow, so that the process can be considered as quasistatic. An example of sliding contact of a 3D printed “rough body” on small spheres artificially located on a rubber layer is presented. The trajectory of particles during the sliding is captured for studying their movement and the correlation to the fluctuation of normal and tangential force.

Paper 21: Measurements of Friction and Wear under Conditions of Dynamic Excitation

1967 ◽  
Vol 182 (14) ◽  
pp. 175-182
Author(s):  
K. Barker ◽  
H. Kaliszer ◽  
G. W. Rowe
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Friction And Wear ◽  
Sliding Contact ◽  
Impulsive Force ◽  
Metal Interface ◽  
Heavy Load ◽  
Dynamic Excitation ◽  
Interfacial Contact ◽  
Steel Disc

An experimental study is being made of the friction and wear of pins of different materials in sliding contact with a rotating mild steel disc. A load is applied by dead weights and the excitation is introduced either by out-of-balance in the wheel or by an electromechanical vibrator attached to the loading arm. Stepless speed variation up to 60 ft/s is provided. The friction force, temperature, and worn volume are recorded continuously. Under light loads a synchronous impulsive force appears to decrease the shear strength of the lubricant–metal interface, whereas under a heavy load it does not have a significant effect on the interfacial contact. Synchronous vibrations alter the wear pattern of a phosphor-bronze pin. The running-in period is extended, but the final wear rate is greater. Changes in the running-in characteristics of a steel pin are not observed.

An experimental study of contact parameters for a cylinder with a polymer coating

1977 ◽  
Vol 13 (2) ◽  
pp. 307-309
Author(s):  
V. E. Starzhinskii ◽  
T. A. Doroshkina ◽  
V. V. Mozharovskii ◽  
S. A. Osipenko
Keyword(s):  
Experimental Study ◽  
Polymer Coating ◽  
Contact Parameters

Large strains associated with sliding contact of metals

1998 ◽  
Vol 1 (4) ◽  
pp. 231-234 ◽  
Author(s):  
David A. Rigney
Keyword(s):  
Sliding Contact ◽  
Large Strains

An Analysis of Rivet Die Design in Electromagnetic Riveting

1988 ◽  
Vol 110 (1) ◽  
pp. 65-69 ◽  
Author(s):  
P. G. Reinhall ◽  
S. Ghassaei ◽  
V. Choo
Keyword(s):  
Experimental Study ◽  
Crack Formation ◽  
Radial Component ◽  
Die Design ◽  
Large Strains ◽  
High Quality ◽  
Riveting Process ◽  
Electromagnetic Riveting ◽  
Careful Design

This paper presents the findings of a numerical and experimental study of the quality of 7050-T73 aluminum rivets formed by an extremely fast electromagnetic riveting process. It is found that without careful design of the rivet forming die large strains are produced which cause crack formation in the rivet heads. By the use of finite element and experimental techniques, it is shown that control of the radial component of the flow of material in the rivet head is essential in avoiding crack formation. A rivet die design which is effective in producing high quality, crack free, rivets is proposed.

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