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Rolling-element fatigue can be initiated by hard inclusions in the material; corrosion; surface stress raisers such as dents, grinding imperfections, or geometric stress concentrations; microspalling; and surface interactions dependent on roughness and lubrication lm thickness Sometimes thin layers of case hardening, surface checks from heat treatment and high sliding velocities, excessive temperature, type of lubricant, or contamination can accelerate the action of fatigue If the surface is stressed in a corrosive environment, a phenomenon called corrosion fatigue or stress corrosion occurs Corrosion on either the cam or roller follower will initially roughen the smooth rolling surface and form minute pits from which a fatigue crack will start due to the local stress concentration The use of a lubricant has another function besides the reduction of friction of the surfaces, which is to prevent corrosion and ensure longer fatigue life 9442 Surface Fatigue Design As mentioned previously cams, rolling-element bearings, and gearing are machine elements that are similar in their performance, and they fail most frequently by surface fatigue Unfortunately statistical wear data have been developed for rolling-element bearings and gearing but not for cam-follower systems The diversity and complexity of cam-follower systems has prevented a complete wear design methodology to evolve Nevertheless, this section presents a simpli ed design procedure for the cam engineer The data presented will be of initial value as a guide in selecting compatible material combinations for the cam and follower Ultimately, the proper materials, wear performance, and lubricant must be con rmed in the eld under actual operating conditions Test data are presented for the comparison of cam and follower fatigue under pure rolling and rolling with some sliding conditions Experience has shown that some sliding may occur, even at low speeds, affecting the wear life of the contacting surfaces Life surface fatigue tests were conducted by Talbourdet (1950), Morrison (1968), and Cram (1956) utilizing radially loaded contacting cylinders with (a) pure rolling and (b) rolling with 9 percent sliding Three-inch diameter mating rollers were used; one roller had a hardened steel surface (60-62 RC) and the other, softer roller was cast iron, steel (of different hardnesses), bronze, and nonmetallic materials The weaker roller material wore out under the cyclical loading which established the life of the materials in combination The stress test data algorithm relates smax to the hertzian compressive stress Eq (911) for dissimilar metals in surface contact For a Poisson s ratio m = 03 and the normal force per cylinder length P = K lb in 1 1 + r1 r2 (913).

// Close the Response respClose(); } }

Sometimes you will want to know when a resource was last updated This is easy to find out when using HttpWebResponse because it defines the LastModified property It is shown here: public DateTime LastModi ed { get; } LastModified obtains the time that the content of the resource was last modified The following program displays the time and date at which the URI entered on the command-line site was last updated:

Part II:

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/* Use LastModified To see the date on which a website was last modified, enter its URI on the command line For example, if you call this program LastModifiedDemo, then to see the date of last modification for HerbSchildtcom enter LastModifiedDemo http://wwwHerbSchildtcom */ using System; using SystemNet; class LastModifiedDemo { static void Main(string[] args) { if(argsLength != 1) { ConsoleWriteLine("Usage: LastModifiedDemo <uri>"); return ; } HttpWebRequest req = (HttpWebRequest) WebRequestCreate(args[0]); HttpWebResponse resp = (HttpWebResponse) reqGetResponse(); ConsoleWriteLine("Last modified: " + respLastModified); respClose(); } }

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on the left) and therefore are alphabetical in the universe the wizard builds If you change this parameter to COLUMNS_SORT=No, then objects are sorted according to their physical order in the table (shown on the right) This is a much better sort order because join keys then appear at the top of the table browser, rather than being intermingled throughout the list

To show how easy WebRequest and WebReponse make Internet programming, a skeletal web crawler called MiniCrawler will be developed A web crawler is a program that moves from link to link to link Search engines use web crawlers to catalog content MiniCrawler is, of course, far less sophisticated than those used by search engines It starts at the URI that you specify and then reads the content at that address, looking for a link If a link is found, it then asks if you want to go to that link, search for another link on the existing page, or quit Although this scheme is quite simple, it does provide an interesting example of accessing the Internet using C# MiniCrawler has several limitations First, only absolute links that are specified using the href= http hypertext command are found Relative links are not used Second, there is no way to go back to an earlier link Third, it displays only the links and no surrounding content Despite these limitations, the skeleton is fully functional, and you will have no trouble enhancing MiniCrawler to perform other tasks In fact, adding features to MiniCrawler is a good way to learn more about the networking classes and networking in general Here is the entire code for MiniCrawler: