Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile Polymers
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 o...
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| Format: | Article |
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MDPI AG
2021-04-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/8/1945 |
| _version_ | 1797537832209743872 |
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| author | Anja Gosch Florian Josef Arbeiter Silvia Agnelli Michael Berer Francesco Baldi |
| author_facet | Anja Gosch Florian Josef Arbeiter Silvia Agnelli Michael Berer Francesco Baldi |
| author_sort | Anja Gosch |
| collection | DOAJ |
| description | 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 (J<sub>0.2</sub> and J<sub>bl</sub>) were determined, namely, the initiation parameter J<sub>ini</sub> (based on the crack propagation kinetics curve) and the initiation parameter J<sub>I,lim</sub> (based on an ESIS TC 4 draft protocol). It was found that J<sub>0.2</sub> and J<sub>bl</sub> could be used as crack initiation parameters whereby J<sub>ini</sub> and J<sub>I,lim</sub> are indicative of the onset of stable crack growth. |
| first_indexed | 2024-03-10T12:21:52Z |
| format | Article |
| id | doaj.art-14f9d30fcae74b94b530761585539b53 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T12:21:52Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-14f9d30fcae74b94b530761585539b532023-11-21T15:22:58ZengMDPI AGMaterials1996-19442021-04-01148194510.3390/ma14081945Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile PolymersAnja Gosch0Florian Josef Arbeiter1Silvia Agnelli2Michael Berer3Francesco Baldi4Materials Science and Testing of Polymers, Montanuniversitaet Leoben, Otto-Gloeckel-Str. 2, 8700 Leoben, AustriaMaterials Science and Testing of Polymers, Montanuniversitaet Leoben, Otto-Gloeckel-Str. 2, 8700 Leoben, AustriaDipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Via Branze 38, 25123 Brescia, ItalyPolymer Competence Center Leoben GmbH, Roseggerstr. 12, 8700 Leoben, AustriaDipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Via Branze 38, 25123 Brescia, ItalyFracture 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 (J<sub>0.2</sub> and J<sub>bl</sub>) were determined, namely, the initiation parameter J<sub>ini</sub> (based on the crack propagation kinetics curve) and the initiation parameter J<sub>I,lim</sub> (based on an ESIS TC 4 draft protocol). It was found that J<sub>0.2</sub> and J<sub>bl</sub> could be used as crack initiation parameters whereby J<sub>ini</sub> and J<sub>I,lim</sub> are indicative of the onset of stable crack growth.https://www.mdpi.com/1996-1944/14/8/1945material key curveABScrack growth resistanceconstrainttriaxialityinitiation parameter |
| spellingShingle | Anja Gosch Florian Josef Arbeiter Silvia Agnelli Michael Berer Francesco Baldi Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile Polymers Materials material key curve ABS crack growth resistance constraint triaxiality initiation parameter |
| title | Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile Polymers |
| title_full | Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile Polymers |
| title_fullStr | Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile Polymers |
| title_full_unstemmed | Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile Polymers |
| title_short | Size-Induced Constraint Effects on Crack Initiation and Propagation Parameters in Ductile Polymers |
| title_sort | size induced constraint effects on crack initiation and propagation parameters in ductile polymers |
| topic | material key curve ABS crack growth resistance constraint triaxiality initiation parameter |
| url | https://www.mdpi.com/1996-1944/14/8/1945 |
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