The fracture behavior of microcellular polycarbonate (PC) was investigated. A work of fracture test was conducted on double-edge-notched-tension (DENT) specimens and this produced reliable tensile failure data the work of fracture was found to decrease linearly with foam relative density. A critical initiation stress intensity factor Kc was calculated from fracture toughness tests in which compact tension specimens were pulled in tension. In all tests, the impact/fracture behavior of these foams was a strong function of foam density.

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