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

Anja Gosch; Florian Josef Arbeiter; Silvia Agnelli; Michael Berer; Francesco Baldi

doi:10.3390/ma14081945

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

Anja Gosch, Florian Josef Arbeiter, Silvia Agnelli, Michael Berer, Francesco Baldi

Chair of Materials Science and Testing of Polymers (210)

Research output: Contribution to journal › Article › Research › peer-review

Abstract

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.

Original language	English
Article number	1945
Number of pages	23
Journal	Materials
Volume	14.2021
Issue number	8
DOIs	https://doi.org/10.3390/ma14081945
Publication status	Published - 13 Apr 2021

Bibliographical note

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.

Keywords

ABS
Constraint
Crack growth resistance
Initiation parameter
Material key curve
Triaxiality

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10.3390/ma14081945

Cite this

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abstract = "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.",

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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.

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VL - 14.2021

JO - Materials

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M1 - 1945

ER -

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

Abstract

Bibliographical note

Keywords

Access to Document

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