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Unformatted text preview: 3) K Ic =Y *sqrt(pie*a) 82.4=1*345*sqrt(pie*a) a=0.018158m 4) K Ic =Y *sqrt(pie*a) 98.9=1*430*sqrt(pie*a) a=0.016839m=16.839mm because the critical flaw is above 3.0mm it is subject to detection. 5) i) Polymer crystallinity is the packing of molecular chains to produce an ordered atomic array. These structures may be described using unit cells, which can be very complex. ii) In polymers the glass transition temperature T g is the period where the amorphous solid polymer transforms from a rigid to a rubbery state. The value of T g depends on molecular characteristics that affect chain stiffness. To determine T g for a given polymer you can look it up if you know either the material of the polymer or the molecular weight of the polymer....
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This note was uploaded on 09/21/2009 for the course MAT 033 taught by Professor Kiely during the Spring '07 term at Lehigh University .
 Spring '07
 KIELY

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