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

By D R Moore

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I . . i . . . . : . " i " .................................. ~................... -----:. sPS ............ i ......... -:.......... ~-........ i--------~....... ;----i ...... ii.................. i ............. i.......... i ........ 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.

10 100 ts [rain] iiii 1000 i~iil 10000 i~iii 100000 Fig. 4 Applied stress versus the corresponding time to failure of notched specimens of cross linked HDPE in a surface active agent (Nekanil| at 50~ Cross-linking If disentanglement prevails in failure of polymers cross linking of the molecules should increase life time enormously because slippage is practically impossible. Fig. 7mm deep notch were stressed at various constant loads in the 10000 E ! ! ! i!!!!!!!!! i!! i!! 100 q [dl/g] Fig. 5 Time of failure as a function of the intrinsic viscosity of HDPE at 2 MPa tensile stress in a surface active agent (Nekanil| at 50~ liquid.

A. ~. i _~ 100Mrad; Nekanil , 0,1 : , , : , 1 : . . 10 100 ts [rain] iiii 1000 i~iil 10000 i~iii 100000 Fig. 4 Applied stress versus the corresponding time to failure of notched specimens of cross linked HDPE in a surface active agent (Nekanil| at 50~ Cross-linking If disentanglement prevails in failure of polymers cross linking of the molecules should increase life time enormously because slippage is practically impossible. Fig. 7mm deep notch were stressed at various constant loads in the 10000 E !

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