Non linear Fracture Mechanics of Polymers: Load Separation and Normalization Methods.

FRONTINI, PATRCIA MARÍA; FASCE, LAURA ALEJANDRA; RUEDA, FEDERICO

ENGINEERING FRACTURE MECHANICS

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2012 vol. 79 p. 389 - 414

0013-7944

Innovatively here, the Load Separation Principle and the deformation function are expressed in terms of total displacement without distinguishing between elastic and plastic displacement components. Hence, calculations are simply made using the J-Integral formula based on total energy. The performance of the proposed methods is evaluated and compared with the standard multiple-specimen technique for a broad spectrum of ductile polymers. Several features of the approaches are discussed like: suitability of functional forms, influence of blunting assumption, calibration points and general limitations to their application. The results demonstrate the ease and the accurate of the Normalization method based on total displacement for ductile polymer J?R curve determination. Conversely, the great potentiality of Load Separation method relies on the special fracture cases in which the actual final crack length cannot be easily determined.