6Meyer RW , Pruitt 1 A. The effect of cyclic true strain on the mor- phology, structure, and relaxation behavior of ultra high molecular weight polyethylene [ J ]. Polymer, 2001,42 ( 5 ) : 293 - 306.
7Karr C L,Week B. Least median squares curve fitting using a ge-netic algorithm [ J ]. Engineering applications of Artificial Intelli- gence,1995,8(2) :177 - 189.
