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Factors affecting the limiting crack velocity in polymeric materials

Polymer, ISSN: 0032-3861, Vol: 41, Issue: 13, Page: 4881-4887
2000
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It is often stated that the theoretical limit for the velocity of crack propagation in materials relates to the free surface Rayleigh wave velocity or other wave related criteria [Roberts DK, Wells AA. Engineering 1954;171:820; Field JE. Contemporary Physics, 1983;24(5):439; Schardin H. In: Averbach BL, Fellbeck DJK, Hahn GT, Thomas DA, editors. Fracture, chap. 16, New York: Wiley, 1959; Anderson OL. In: Averbach BL, Fellbeck DJK, Hahn GT, Thomas DA, editors. Fracture, chap. 17, New York: Wiley, 1959.] However, the limiting crack velocity in many materials is less than this theoretical limit and considerably so for tough polymers. Using experimental fracture data obtained from a range of tough polymers, and a computer model in which toughness, stiffness and other material parameters can be independently varied, relationships have been identified between limiting crack velocity and toughness properties of polymers.

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