Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile Polymers
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In: Materials, Vol. 14.2021, No. 8, 1945, 13.04.2021.
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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 -