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Multi-parameter average strain energy density factor criterion applied on the bi-material notch problem
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SYSNO ASEP 0506849 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Multi-parameter average strain energy density factor criterion applied on the bi-material notch problem Author(s) Klusák, Jan (UFM-A) RID, ORCID
Krepl, Ondřej (UFM-A)Number of authors 2 Source Title ECF22 - Loading and Environmental effects on Structural Integrity. - Amsterdam : Elsevier, 2018 / Sedmak A. ; Radakovič Z. ; Rakin M. - ISSN 2452-3216 Pages roč. 13 (2018), s. 1261-1266 Series Procedia Structural Integrity Number of pages 6 s. Publication form Online - E Action ECF 2018 - European Conference on Fracture (ECF) - Loading and Environmental Effects on Structural Integrity /22./ Event date 26.08.2018 - 31.08.2018 VEvent location Belgrade Country RS - Serbia Event type WRD Language eng - English Country NL - Netherlands Keywords stress ; term ; Generalized fracture mechanics ; Crack initiation ; B-material notch ; Stability criterion ; Strain energy density factor Subject RIV JL - Materials Fatigue, Friction Mechanics OECD category Audio engineering, reliability analysis R&D Projects GA16-18702S GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 UT WOS 000459860900208 EID SCOPUS 85064628048 DOI 10.1016/j.prostr.2018.12.258 Annotation The stress field near a bi-material notch tip has the singular character. The power of singularity is lower in comparison to the case of a crack. The stress field can be described by the asymptotic stress series, in which each term contains generalized stress intensity factor and stress term exponent. The terms can be either singular or non-singular depending on the value of stress term exponent. The exponents are determined as solution of eigenvalue problem and depend on material properties and local geometry. The factors are calculated by analytical-numerical approaches and depend on global geometry and applied loading. The singular terms become unbounded when approaching the bi-material notch tip while the non-singular terms vanish. The non-singular terms increase precision in stress description on larger distances from the notch tip. The crack initiation conditions from the notch tip can be assessed by the average strain energy density factor (SEDF) criterion. In the case of bi-material notch problem, the crack can initiate in the direction of global minimum, the local minimum or the interface. The actual crack initiation load is calculated for each of abovementioned directions considering the individual fracture toughnesses. Contrary to the case of a crack, the direction of minimum of SEDF changes in dependence on the distance from the tip, therefore the average value over specific distance is used. The multi-parameter criterion considers singular and non-singular stress terms. Therefore in cases, when the specific distance is large, the non-singular terms provide means to improve precision of prediction of crack initiation parameters. (C) 2018 The Authors. Published by Elsevier B.V. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2020
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