By David Moore; European Structural Integrity Society. Technical Committee 4
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Extra resources for The application of fracture mechanics to polymers, adhesives and composites
A S i i i ................ i .................. i ............. i ......... i ........ i ...... i ..... i .... 1 E-03 ~ . . . . ~. :_. ~ ~ ~ . . . . . . i ... 1 E-04 ~ 1 E-05 . :~. :~i~:..... Ui[ ! i .......!...... 2 Crack propagation rate in fatigue of a syndiotactic and an atactic PS with the same molecular weight of 190 000. (frequency 10 Hz) The higher the molecular weight the lower the crack propagation velocity. This observation confirms that crack propagation occurs by disentanglement and not by rupture.
Correlation between the static fracture toughness (Kic) and AKmax values from the FCP experiments for the various materials investigated. ( 9 neat epoxy 1, (e) neat epoxy 2, (-) epoxy 1 + PDMS, ( * ) epoxy 2 + CSR, (0) epoxy 2 + CTBN CONCLUSIONS Using linear elastic fracture mechanics, the toughening effect of various rubbers, on two different epoxy networks are proven. The fatigue crack propagation was recorded and the Paris law was well confirmed. The toughening mechanisms in static and fatigue conditions are very similar as demonstrated by the correlation between KIc and AKmax.
T . . . -, . . . -, lO" lO z lO" lO o lO' lO 2 lO = lO 4 lO = lO' local loading rate dK/dt, MParnV=s'l | ~,~ 10 ~ 10 ~ 10" 10 0 ~ lO' local loading rate 10 z 10 = 1o' 10' 10 = dK/dt, MPamlas "1 (a) (b) Fig. 8: Fracture toughness, Kic, as a function of local loading rate on for all engineering polymers investigated in this study (average curves of all specimen configurations for a specific material type); (a) indication of sb/b-transition rates (dK/dtsb/br), and (b) indication of slopes and lower bound KIc values (Klcmin)values.
The application of fracture mechanics to polymers, adhesives and composites by David Moore; European Structural Integrity Society. Technical Committee 4