Effect of unidirectional drawing process on fracture behavior of poly(l-lactide)

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    The effects of unidirectional drawing process on fracture behavior of poly(L-lactide) (PLLA), critical J-integral at crack initiation, Jin in the directions perpendicular and parallel to the drawing direction, fracture micromechanism, and surface roughness, R a were investigated. Unidirectional drawing machine was used with variation of draw-ratio from 1 to 2.5 and initial notches were introduced in the direction perpendicular or parallel to the drawing direction. Jin was found to be directly proportional to the draw ratio for the perpendicular direction and inversely proportional for the parallel direction, while similar was the case with R a, suggesting that rough surface formation resulted in high energy dissipation during crack initiation. The elongation and scission of the oriented molecules due to drawing creating rough surface are found to be the primary mechanisms of the toughness improvement due to drawing.

    Original languageEnglish
    Pages (from-to)1393-1396
    Number of pages4
    JournalJournal of Materials Science
    Issue number4
    Publication statusPublished - Feb 2007

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering


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