Application of Fracture Mechanics to Polymers, Adhesives and by D R Moore

By D R Moore

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Extra resources for Application of Fracture Mechanics to Polymers, Adhesives and Composites, Volume 33

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G. [8]). 30 ..... 1. Specific yielding-related essential work of fracture (We,y) as a function of square root of Me for amorphous copolyesters. Designations: PET- polyethylene terephthalate, PETG- and PCTG- amorhous PET-type copolyesters with various amounts of cyclohexylenedimethylene units, PEN- polyethylene naphthalate [2,5]. Fracture Mechanical Behavior of Thermoplastic Polymers 27 According to the model proposed by Brown [9] for glassy polymers which fail by crazing, the fracture energy (Gc) increases linearly with the square of re.

I . . . . , . . . . I . . . . , . . . . 1 . . . . , . . . . ~ ........ mlns'l (b) i G. 3 . . . . ~ . . . -1 ........ , . . . . ~ ........ , . . . . , ........ i ........ , ........ , 10 z 10~ 100 101 102 103 104 10s 10e local loading rate dK/dt, MPamtrZ$ "1 (c) Fig. 6" Effect of local loading rate on fracture toughness for f3+-PP(H) using various specimen configurations and data reduction schemes; (a) POM, (b) PC and (c) [3+-PP(H). The good agreement of force based analysis Kic values and Kid values obtained from dynamic key curve (DKC) experiments in the high loading rate regime is shown in Fig.

L ...... -I ....... 1 ,~..... ~ ....... ~ ...... ,I ....... ~ ....... 1 ....... 10 z 10 ~ 10"~ 100 10 ~ 102 10 ~ 104 10 ~ 106 loading rate dK/dt, MPam~2s "1 Fig. 3. Influence of plane stress (pss) vs. plane strain (psn) conditions on the d/sb-transition over a wide loading rate for I3+-PP(H); 2 mm thick DENT (near plane stress; dK/dtd/sbm~) and CRB specimens (near plane strain; dK/dtd/~bP~"). 1 0,6, 0,4, 0,2. diqdte,b~n o,o 10s diqdt~,bP" ..... -n ...... I . -n ...... I ..... % ...... I ......

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