TY - JOUR

T1 - Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile Polymers

AU - Gosch, Anja

AU - Arbeiter, Florian Josef

AU - Agnelli, Silvia

AU - Berer, Michael

AU - Baldi, Francesco

N1 - Funding Information: Acknowledgments: The research work of this paper was performed at the Materials Science and Testing of Polymers/Montanuniversitaet Leoben within the framework of the COMET Program of the Federal Ministry for Climate Action, Environment, Energy, Mobility, Innovation and Technol‐ ogy and the Federal Ministry for Digital and Economic Affairs with contributions by the Polymer Competence Center Leoben GmbH and the Università degli Studi di Brescia (Dipartimento di Ingegneria Meccanica e Industriale). Funding Information: The research work of this paper was performed at the Materials Science and Testing of Polymers/Montanuniversitaet Leoben within the framework of the COMET Program of the Federal Ministry for Climate Action, Environment, Energy, Mobility, Innovation and Technology and the Federal Ministry for Digital and Economic Affairs with contributions by the Polymer Competence Center Leoben GmbH and the Universit? degli Studi di Brescia (Dipartimento di Ingegneria Meccanica e Industriale). Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2021/4/13

Y1 - 2021/4/13

N2 - Fracture mechanics are of high interest for the engineering design and structural integrity assessment of polymeric materials; however, regarding highly ductile polymers, many open questions still remain in terms of fully understanding deformation and fracture behaviors. For example, the influence of the constraint and specimen size on the fracture behavior of polymeric materials is still not clear. In this study, a polymeric material with an elastic plastic deformation behavior (ABS, acrylonitrile butadiene styrene) is investigated with regard to the influence of constraint and specimen size. Different single-edge notched bending (SENB) specimen sizes with constant geometrical ratios were tested. The material key curve was used to investigate differences in the constraint, where changes for small and large specimen sizes were found. Based on a size-independent crack resistance curve (J–R curve), two apparent initiation parameters (J0.2 and Jbl) were determined, namely, the initiation parameter Jini (based on the crack propagation kinetics curve) and the initiation parameter JI,lim (based on an ESIS TC 4 draft protocol). It was found that J0.2 and Jbl could be used as crack initiation parameters whereby Jini and JI,lim are indicative of the onset of stable crack growth.

AB - Fracture mechanics are of high interest for the engineering design and structural integrity assessment of polymeric materials; however, regarding highly ductile polymers, many open questions still remain in terms of fully understanding deformation and fracture behaviors. For example, the influence of the constraint and specimen size on the fracture behavior of polymeric materials is still not clear. In this study, a polymeric material with an elastic plastic deformation behavior (ABS, acrylonitrile butadiene styrene) is investigated with regard to the influence of constraint and specimen size. Different single-edge notched bending (SENB) specimen sizes with constant geometrical ratios were tested. The material key curve was used to investigate differences in the constraint, where changes for small and large specimen sizes were found. Based on a size-independent crack resistance curve (J–R curve), two apparent initiation parameters (J0.2 and Jbl) were determined, namely, the initiation parameter Jini (based on the crack propagation kinetics curve) and the initiation parameter JI,lim (based on an ESIS TC 4 draft protocol). It was found that J0.2 and Jbl could be used as crack initiation parameters whereby Jini and JI,lim are indicative of the onset of stable crack growth.

KW - ABS

KW - Constraint

KW - Crack growth resistance

KW - Initiation parameter

KW - Material key curve

KW - Triaxiality

UR - http://www.scopus.com/inward/record.url?scp=85104147249&partnerID=8YFLogxK

U2 - 10.3390/ma14081945

DO - 10.3390/ma14081945

M3 - Article

AN - SCOPUS:85104147249

VL - 14.2021

JO - Materials

JF - Materials

SN - 1996-1944

IS - 8

M1 - 1945

ER -