design example 291 in 1844 charles

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Unformatted text preview: tion Deformation C C Crosslinks as H Double H Hofof time, independentH of whether such one double a function the Hsame sign stacked vertically above Remaining H SSHH dislocations bonds are potential (primary bonds H bonds H H H HSSHH H crosslink sites betweenthe extra half planes being chains) deformation ais elastic or plastic. another. AsC Cresult of all of CCCC CC CCCCCCCC in Hone R H H of the crystal, tilt is created.H H R H portion H H HRH transference Hnumbers A aset ofH values rangingH from 0 The natural logarithm of the true stress t t length divided divided by the length. The force by the original instantaneous instantaneous area normal to is essentially force. Numerically, it the applied equivalent to the engineering strain of a crystal to about all twin A portion for strains up in which 0.1. of the atoms are in mirror-image force divided by the instantaneous in true stress t The positions compared with atoms the bulk of thethe applied force. area normal to crystal. twist boundary ofA boundary whichis composed of a twin A portion a crystal in that all of the atoms pg054 [V] G2 7-27060 / IRWIN / Schaffer 54 Part I ak 01-03-98 pgm 1-19-98 QC2 Fundamentals ....................................................................................................................................... DESIGN EXAMPLE 2.9–1 In 1844 Charles Goodyear was the first person to recognize that sulfur can be added to rubber to promote the formation of crosslinks between the polymer chains in order to produce a polymer (rubber) with superior mechanical properties. This process is known as vulcanization. What element other than sulfur might also be used to form crosslinks in rubber? (Hint: First consider the bond characteristics of S in order to understand why Goodyear found this element to be the key ingredient in the vulcanization process.) Solution The purpose of the atoms in the crosslinks is to form a “bridge” between two polymer chains. As such, the crosslinking atoms must each form two covalent bonds....
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This note was uploaded on 02/25/2013 for the course PHYS 2202 taught by Professor Sowell during the Spring '10 term at Georgia Institute of Technology.

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