Fracture toughness to understand stretch-flangeability and edge cracking resistance in AHSS
| Autor: | Silvia Molas, David Gutiérrez, Lluís Pérez, Daniel Casellas, D. Frómeta, Clemens Suppan, A. Lara, Johannes Rehrl |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC, Universitat Politècnica de Catalunya. Doctorat en Ciència i Enginyeria dels Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Materials science 02 engineering and technology Edge (geometry) Steel High strength Mecànica de fractura 020901 industrial engineering & automation Fracture toughness Fracture mechanics Acer d'alta resistència Formability Martensite Ligament length Composite material Strength of materials Ductility Resistència de materials Structural material Metals and Alloys Digital image correlation Fracture process zone 021001 nanoscience & nanotechnology Condensed Matter Physics Enginyeria dels materials::Metal·lúrgia [Àrees temàtiques de la UPC] Cracking Mechanics of Materials Fracture (geology) 0210 nano-technology |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| DOI: | 10.1007/s11661-016-3815-x |
| Popis: | This is a post-peer-review, pre-copyedit version of an article published in Metallurgical and materials transactions A-Physical metallurgy and material. The final authenticated version is available online at: http://dx.doi.org/10.1007/s11661-016-3815-x. The edge fracture is considered as a high risk for automotive parts, especially for parts made of advanced high strength steels (AHSS). The limited ductility of AHSS makes them more sensitive to the edge damage. The traditional approaches, such as those based on ductility measurements or forming limit diagrams, are unable to predict this type of fractures. Thus, stretch-flangeability has become an important formability parameter in addition to tensile and formability properties. The damage induced in sheared edges in AHSS parts affects stretch-flangeability, because the generated microcracks propagate from the edge. Accordingly, a fracture mechanics approach may be followed to characterize the crack propagation resistance. With this aim, this work addresses the applicability of fracture toughness as a tool to understand crack-related problems, as stretch-flangeability and edge cracking, in different AHSS grades. Fracture toughness was determined by following the essential work of fracture methodology and stretch-flangeability was characterized by means of hole expansions tests. Results show a good correlation between stretch-flangeability and fracture toughness. It allows postulating fracture toughness, measured by the essential work of fracture methodology, as a key material property to rationalize crack propagation phenomena in AHSS. This investigation has been partially funded by the Catalan government under grant TECCTA-13-1-0005 and by the European Commission, Research Fund for Coal and Steel, under grant agreement RFSR-CT-2014-00015 (Tough-Sheet). |
| Databáze: | OpenAIRE |
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