Journal Published Online: 15 July 2020
Volume 9, Issue 5

Determination of the Fracture Resistance of Ductile Polymers: The ESIS TC4 Recent Experience



Round-robin (RR) tests carried out under the direction of the Technical Committee 4, “Polymers, Polymer Composites and Adhesives,” of the European Structural Integrity Society (ESIS TC4) showed that the multispecimen methodology employed for the construction of the crack growth resistance curve (J vs crack extension, Δa) of polymers often does not provide reliable data because of the uncertainties associated with the measurement of Δa. With this in mind, the ESIS TC4 attention has been more recently focused on the analysis of a testing scheme based on the load separation criterion, which does not require the measurement of Δa. With the aim to employ this new approach into a standardized procedure, the degree of reproducibility of the results obtainable with the application of this testing scheme to ductile polymers has been assessed by means of multilaboratory RR testing exercises that started in 2011. An ESIS TC4 reference draft protocol was prepared and 10 laboratories participated in the RR activities. The present work describes the load separation criterion-based testing procedure recently examined by ESIS TC4 and gives a summary of the results obtained in the RR activities, which appear encouraging.

Author Information

Baldi, Francesco
Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Brescia, Italy
Agnelli, Silvia
Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Brescia, Italy
Andena, Luca
Dipartimento di Chimica, Materiali e Ingegneria Chimica “G. Natta,” Politecnico di Milano, Milano, Italy
Blackman, Bamber R. K.
Department of Mechanical Engineering, Imperial College London, London, UK
Castellani, Leonardo
Versalis S.p.A., Basic Chemicals and Plastics Research Center, Mantova, Italy
Frontini, Patricia M.
Universidad Nacional de Mar del Plata, Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), Argentina (B7606BVZ)
Kučera, Jaroslav
Unipetrol RPA, s.r.o. - Polymer Istitute Brno, odštěpný závod, Brno, Czech Republic
Laiarinandrasana, Lucien
MINES ParisTech, PSL Research University, MAT-Centre des Matériaux, Evry Cedex, France
Pegoretti, Alessandro
Dipartimento di Ingegneria Industriale, Polo Scientifico e Tecnologico “F. Ferrari,” Università degli Studi di Trento, Trento, Italy
Salazar, Alicia
Grupo de Durabilidad e Integridad Mecánica de Materiales Estructurales (DIMME), Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, Madrid, Spain
Warnet, Laurent
Faculty of Engineering Technology, University of Twente, AE Enschede, the Netherlands
Pages: 13
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Stock #: MPC20190175
ISSN: 2379-1365
DOI: 10.1520/MPC20190175