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941 Wear Phenomena The action between two surfaces in contact is complicated, involving the statistical relationships between many variables Among the parameters are the surface roughness, waviness, and stresses; prior history of machining; modules of elasticity; friction (rolling and sliding); materials; lubrication; corrosion; and loads Wear, in a broad sense, is related to the friction between the two surfaces in contact Simply, wear may be considered the undesirable removal of solid material from rubbing surfaces Basically, the four kinds of wear in cam-follower mechanisms are: adhesive wear, abrasive wear, corrosive wear, and surface fatigue wear Each of these will be articulated in the following sections Also, other, less signi cant types of surface failure do not t into these four categories, such as erosive wear, cavitation wear, and fretting corrosion wear In cam-follower material design, test data will be presented including different perspectives for design Much of the material in the following sections must be utilized with discretion Wear testing and experience of a particular design is critical to optimizing the performance of the mechanism For the engineer, the study of wear mechanisms on a speci c machine may be possible by three methods: examination of wear debris, examination of worn surfaces, and metallographic examination of surface and subsurface structures In the examination of the wear debris, usually collected from the lubricating oil, large lumps imply adhesive wear; ne particles, oxidative wear; chiplike particles, abrasive wear; and akelike particles, delamination wear In the examination of the worn surface heavy tearing implies adhesive wear; scratches, abrasive wear; and burnishing, nonadhesive wear Metallographic examination of the surface structure may reveal the type of deformation to the sliding process, the generation of subsurface crack, incipient delamination, and other things 9411 Surface De nition A fundamental understanding of the mechanisms interacting with the tribological surface is of utmost importance in lubrication A solid surface is not a at or smooth surface When a surface is examined with an electron microscope or surface pro lometer, it is found to contain irregularities called asperities; see Buckley (1997) and Fig 96a The asperity surfaces contain surface lms they are not clean (Fig 96b) For metals, these lms consist of oxides and absorbed gases usually water vapor, carbon monoxide, and carbon dioxide Nonmetals may contain other adsorbates All lm materials strongly affect the mechanical and metallurgical behavior of contacting solids Also, the near surface (surfacial) layers of the solid itself may vary from the bulk of the solid Crystalline solids may have recrystallized material and strain hardening In metals, polishing or nishing the operation of a surface produces these surfacial layers These layers are generally rich in impurities When the two solids touch, the area of contact is at the points of the contacting asperities across the interface, Fig 96c Initial contact of the solids deforms the asperities elastically, later followed by plastic deformation when the load is increased It is at.

This is part of the hypertext associated with the McGraw-Hillcom website Because the program simply displays the content character-by-character, it is not formatted as it would be by a browser; it is displayed in its raw form Let s examine this program line-by-line First, notice the SystemNet namespace is used As explained, this is the namespace that contains the networking classes Also notice that SystemIO is included This namespace is needed because the information from the website is read using a Stream object The program begins by creating a WebRequest object that contains the desired URI Notice that the Create( ) method, rather than a constructor, is used for this purpose Create( ) is a static member of WebRequest Even though WebRequest is an abstract class, it is still possible to call a static method of that class Create( ) returns a WebRequest object that has the proper protocol plugged in, based on the protocol prefix of the URI In this case, the protocol is HTTP Thus, Create( ) returns an HttpWebRequest object Of course, its return value must still be cast to HttpWebRequest when it is assigned to the HttpWebRequest reference called req At this point, the request has been created, but not yet sent to the specified URI To send the request, the program calls GetResponse( ) on the WebRequest object After the request has been sent, GetResponse( ) waits for a response Once a response has been received, GetResponse( ) returns a WebResponse object that encapsulates the response This object is assigned to resp Since, in this case, the response uses the HTTP protocol, the result is cast to HttpWebResponse Among other things, the response contains a stream that can be used to read data from the URI Next, an input stream is obtained by calling GetResponseStream( ) on resp This is a standard Stream object, having all of the attributes and features of any other input stream A reference to the stream is assigned to istrm Using istrm, the data at the specified URI can be read in the same way that a file is read.

Part II:

Part II:

FIGURE 96 Surface topography and contact (Adapted from Buckley, DH, Tribology Fundamentals, Tribology for Aerospace Applications, EV Zaretsky, Ed, copyrighted by the Soc of Trib and Lub Eng, Park Ridge, Ill, with permission)

Next, the program reads the data from McGraw-Hillcom and displays it on the screen Because there is a lot of information, the display pauses every 400 characters and waits for you to press enter This way the first part of the information won t simply scroll off the screen Notice that the characters are read using ReadByte( ) Recall that this method returns the next byte from the input stream as an int, which must be cast to char It returns 1 when the end of the stream has been reached Finally, the response is closed by calling Close( ) on resp Closing the response stream automatically closes the input stream, too It is important to close the response between each request If you don t, it is possible to exhaust the network resources and prevent the next connection Before leaving this example, one other important point needs to be made: It was not actually necessary to use an HttpWebRequest or HttpWebResponse object to display the hypertext received from the server Because the preceding program did not use any HTTPspecific features, the standard methods defined by WebRequest and WebResponse were sufficient to handle this task Thus, the calls to Create( ) and GetResponse( ) could have been written like this:

// First, create a WebRequest to a URI WebRequest req = WebRequestCreate("http://wwwMcGraw-Hillcom"); // Next, send that request and return the response WebResponse resp = reqGetResponse();

FIGURE 9-1 The universe pane shows classes and objects as they appear to users when building a query