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- W2060330131 abstract "This paper describes some preliminary studies of the crack-induced fracture of structural foams molded from LexanR resin. Single edge-notch (SEN), double-cantilever beam (DCB), and compact tension specimens of various sizes were evaluated independently. A rapid rise in the nominal crack tip stress with decreasing sample size in the SEN and compact tension specimens was found to introduce significant errors in the strain-energy release rate (G) values calculated from data on small samples. Minimum sample size constraints were established from plots of G against σnom/σF. The concept of plane strain failure in these materials appears to be complicated by significant microscopic crazing and shear yielding in the thin bubble walls resulting in G values which are somewhat higher than those reported for the solid resin. This localized deformation, which is not readily discerned from the shape of the load/elongation curves or the macroscopic appearance of the fracture surfaces, results in an overestimation in the inherent flaw size for these materials." @default.
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- W2060330131 date "1977-10-01" @default.
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- W2060330131 title "Fracture toughness of polycarbonate structural foams" @default.
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- W2060330131 doi "https://doi.org/10.1063/1.323446" @default.
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