Fracture of Thin-Walled Polyoxymethylene Bulk Specimens in Modes I and III
Thin-walled polymeric components are used in many applications. Hence, knowledge about their fracture behavior in bulk is beneficial in practice. Within this study, the double cantilever beam (DCB) and out-of-plane double cantilever beam (ODCB) tests are enhanced to enable the testing of such bulk s...
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MDPI AG
2020-11-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/22/5096 |
| _version_ | 1797548130760130560 |
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| author | Peer Schrader Anja Gosch Michael Berer Stephan Marzi |
| author_facet | Peer Schrader Anja Gosch Michael Berer Stephan Marzi |
| author_sort | Peer Schrader |
| collection | DOAJ |
| description | Thin-walled polymeric components are used in many applications. Hence, knowledge about their fracture behavior in bulk is beneficial in practice. Within this study, the double cantilever beam (DCB) and out-of-plane double cantilever beam (ODCB) tests are enhanced to enable the testing of such bulk specimens in mode I and mode III on the basis of the <i>J</i>-integral. This paper then presents and discusses the experimental results following the investigation of a semicrystalline polymer (polyoxymethylen) under quasi-static load conditions. From the experiments, fracture energies of similar magnitude in both mode I and mode III were determined. In mode III, pop-in fracture was observed. Furthermore, the fracture surfaces were investigated regarding the mode I and mode III dominant crack growth mechanisms, based on the morphology of the tested material. For specimens tested in mode I, no signs of plastic deformation were observed, and the fracture surface appears flat. In mode III, some samples display a twisted fracture surface (twisting angle close to 45<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>), which indicates local mode I crack growth. A transfer of the presented methodology to other (more ductile) polymeric materials is deemed possible without further restrictions. In addition, the presented setup potentially enables an investigation of polymeric bulk specimens in mixed mode I+III. |
| first_indexed | 2024-03-10T14:55:08Z |
| format | Article |
| id | doaj.art-9dff79eb23d64463b6ba9af4a7093f08 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T14:55:08Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-9dff79eb23d64463b6ba9af4a7093f082023-11-20T20:39:58ZengMDPI AGMaterials1996-19442020-11-011322509610.3390/ma13225096Fracture of Thin-Walled Polyoxymethylene Bulk Specimens in Modes I and IIIPeer Schrader0Anja Gosch1Michael Berer2Stephan Marzi3Institute for Mechanics and Materials, Technische Hochschule Mittelhessen, 35390 Gießen, GermanyMaterials Science and Testing of Polymers, Montanuniversität Leoben, 8700 Leoben, AustriaPolymer Competence Center Leoben GmbH, Roseggerstraße 12, 8700 Leoben, AustriaInstitute for Mechanics and Materials, Technische Hochschule Mittelhessen, 35390 Gießen, GermanyThin-walled polymeric components are used in many applications. Hence, knowledge about their fracture behavior in bulk is beneficial in practice. Within this study, the double cantilever beam (DCB) and out-of-plane double cantilever beam (ODCB) tests are enhanced to enable the testing of such bulk specimens in mode I and mode III on the basis of the <i>J</i>-integral. This paper then presents and discusses the experimental results following the investigation of a semicrystalline polymer (polyoxymethylen) under quasi-static load conditions. From the experiments, fracture energies of similar magnitude in both mode I and mode III were determined. In mode III, pop-in fracture was observed. Furthermore, the fracture surfaces were investigated regarding the mode I and mode III dominant crack growth mechanisms, based on the morphology of the tested material. For specimens tested in mode I, no signs of plastic deformation were observed, and the fracture surface appears flat. In mode III, some samples display a twisted fracture surface (twisting angle close to 45<inline-formula><math display="inline"><semantics><msup><mrow></mrow><mo>°</mo></msup></semantics></math></inline-formula>), which indicates local mode I crack growth. A transfer of the presented methodology to other (more ductile) polymeric materials is deemed possible without further restrictions. In addition, the presented setup potentially enables an investigation of polymeric bulk specimens in mixed mode I+III.https://www.mdpi.com/1996-1944/13/22/5096polyoxymethylenefracture mechanical testingpolymersquasi-static loadsexperimental proceduresJ-integral |
| spellingShingle | Peer Schrader Anja Gosch Michael Berer Stephan Marzi Fracture of Thin-Walled Polyoxymethylene Bulk Specimens in Modes I and III Materials polyoxymethylene fracture mechanical testing polymers quasi-static loads experimental procedures J-integral |
| title | Fracture of Thin-Walled Polyoxymethylene Bulk Specimens in Modes I and III |
| title_full | Fracture of Thin-Walled Polyoxymethylene Bulk Specimens in Modes I and III |
| title_fullStr | Fracture of Thin-Walled Polyoxymethylene Bulk Specimens in Modes I and III |
| title_full_unstemmed | Fracture of Thin-Walled Polyoxymethylene Bulk Specimens in Modes I and III |
| title_short | Fracture of Thin-Walled Polyoxymethylene Bulk Specimens in Modes I and III |
| title_sort | fracture of thin walled polyoxymethylene bulk specimens in modes i and iii |
| topic | polyoxymethylene fracture mechanical testing polymers quasi-static loads experimental procedures J-integral |
| url | https://www.mdpi.com/1996-1944/13/22/5096 |
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