MSL_LAB5 Contact, Friction and Wear

MSL_LAB5 Contact, Friction and Wear - MANE-4040 MECHANICAL...

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- 1 of 13 - MANE-4040 MECHANICAL SYSTEMS LABORATORY (MSL) Lab Report Cover Sheet Title of Lab: Contact, Friction, and Wear Section 1M, 2W(am), 3W(pm), 4Th, 5F: Section 4 Group ID (A, B, C, D, E): Group E Submitted by Group Leader: Samuel Harrington Group Member: 1 Dan Garr Group Member: 2 Carl Hansen Group Member: 3 Samuel Harrington Group Member: 4 Adam Larouche Group Member: 5 Matt Wilcox Lab Scheduled Date: March 27, 2008 Lab Report Due Date: April 10, 2008 Lab report Received Date (by TA): __________________________________________ Late Penalty Points (by TA): __________________________________________ Section Possible Points Points Given Abstract 10 Introduction 10 Experimental Procedures 15 Results 25 Discussion of Results 25 Conclusions 15 Total 100
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- 2 of 13 - I: Abstract This report discusses the fundamental concepts of contact, friction and wear and their influence on the engineering world. The dependence of contact pressure, size of contact patch and approach of centers on normal load in sphere-on-sphere concentrated contacts are all discussed. The report details the procedure of using an Instron machine in a reciprocating cycle mode to perform pin-on-disk sliding tests and how to measure friction forces and wear volumes. Using the raw data retrieved from LABView a detailed analysis and discussion of wear and contact pressure as they relate to each other is performed and a discussion of results concludes the report. II: Introduction Separate objects in contact with each other may undergo three phenomena. If the objects are in contact and loaded statically, stresses and deformations occur. Contact mechanics is the type of analysis used to determine such deformations and stresses due to the contacting load applied. When sliding of one surface relative to the other occurs, a frictional force resisting the relative motion is developed. In addition to a force between the surfaces, material loss occurs as well. This is known as wear. Material loss from wear is evident in use of a pencil and eraser. Particles of graphite are worn off the tip and onto the paper by pressing and sliding the pencil. When an eraser is used, the graphite is worn off the paper onto the eraser’s rubber. The case of interest for a contact mechanics study is two elastic spheres compressed together. A straightforward way to study this contact mechanics case is to use a sphere and a second sphere and compress along the center to center line. Two not as obvious ways to demonstrate this is to compress one sphere against a flat surface, or one sphere against the inside of a spherical shell. All the listed examples belong to the contact mechanics case of two spheres, except that the radii of the spheres vary. The outside surface of a sphere has a positive radius, whereas the inside surface of a spherical shell has a negative radius. A flat surface is represented as a sphere with an infinite radius.
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This note was uploaded on 04/22/2008 for the course MANE 4040 taught by Professor Maniatty during the Spring '08 term at Rensselaer Polytechnic Institute.

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MSL_LAB5 Contact, Friction and Wear - MANE-4040 MECHANICAL...

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