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- W2034902264 abstract "The double torsion geometry provides a simple method to determine the stress intensity factor, Kc, as a function of the crack velocity, v. The log Kc vs log v relationship is a useful quantitative description for investigating the effect of molecular weight (MW) and molecular weight distribution (MWD) on the fracture toughness or the crack opening displacement uc. A theory which explains the sigmoidal shape of the fracture energy, Yc vs MW is formulated on the assumptions that (a) plastic deformation at the crack tip is induced by polymer molecules having MW larger than the critical MW, Mc, and (b) craze fibrils are stabilized by molecular entanglements. The MWD has little effect on Yc provided that Yc is expressed in terms of number-average MW, ~Mn. A rapid increase in Yc in the region of MW ⋍ Mc is attributed to increase in the entanglement density." @default.
- W2034902264 created "2016-06-24" @default.
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- W2034902264 date "1986-01-01" @default.
- W2034902264 modified "2023-09-27" @default.
- W2034902264 title "The effect of molecular properties on mechanical behaviour of poly(methyl methacrylate)—I stress cracking in air" @default.
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- W2034902264 doi "https://doi.org/10.1016/0014-3057(86)90066-2" @default.
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