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3D assessment of surface influence on crack initiation in sharp notches\nunder a mixed mode of loading
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SYSNO ASEP 0539535 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title 3D assessment of surface influence on crack initiation in sharp notches
under a mixed mode of loadingAuthor(s) Klusák, Jan (UFM-A) RID, ORCID
Kopp, Dalibor (UFM-A)Number of authors 2 Article number 102920 Source Title Theoretical and Applied Fracture Mechanics. - : Elsevier - ISSN 0167-8442
Roč. 112, APR (2021)Number of pages 11 s. Language eng - English Country NL - Netherlands Keywords Crack initiation ; Critical quantity criterion ; Finite fracture mechanics ; Vertex singularity Subject RIV JQ - Machines ; Tools OECD category Applied mechanics R&D Projects LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA20-00761S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UFM-A - RVO:68081723 UT WOS 000661544300003 EID SCOPUS 85100448882 DOI 10.1016/j.tafmec.2021.102920 Annotation Sharp notches occur in constructions and lead to stress concentrations. Thus they are dangerous points of constructions and must be properly evaluated. In the present study the effect of a free surface on crack initiation conditions is observed and evaluated by means of a 3D model of a specimen with a sharp notch and by means of the finite fracture mechanics of general singular stress concentrators (GSSCs). The effect of a free surface on crack propagation and the crack front shape is described in many publications (Hutař et al., 2010, He et al., 2016, Oplt et al., 2019). Concerning GSSCs (sharp notches, bi-material notches, sharp material inclusions, etc.) crack initiation conditions can also be influenced by the presence of the free surface. In our study we suppose the case of a sharp notch in a homogeneous material with a straight notch front perpendicular to the free surface. In this case a crack can be initiated either from the central region of the notch front or at the vertex point (the point where the notch front intersects the free surface). In order to assess the crack initiation conditions in the 3D model, the critical quantity criterion is employed (Klusák et al., 2019). This criterion can be easily used with the knowledge of basic material parameters and with the use of results of finite element calculations of the assessed notch. It is shown that the place of crack initiation depends on the direction of external loading and thus on a mixity of normal and shear modes of loading. A comparison of results of 2D and 3D models is discussed. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0167844221000288?via%3Dihub
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