1. Αποθετήριο Παραδοτέων Υποτρόφων Δράσεων ΕΣΠΑ Τριτοβάθμιας Εκπαίδευσης 2017-2023
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3. Ερευνητικές ομάδες

Τύπος:	Ανακοίνωση σε συνέδριο; Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	A new method for interpreting Vickers indentation measurements
Συγγραφέας:	[EL] Καμπούρης, Αστέριος[EN] Kampouris, Asterios [EL] Λάππας, Κίμων – Ιωάννης[EN] Lappas, Kimon - Ioannis [EL] Κωνσταντινίδης, Αβραάμ[EN] Konstantinidis, Avraam [EL] Αϋφαντής, Ηλίας[EN] Aifantis, Elias
Ημερομηνία:	30/06/2022
Περίληψη:	A new method for interpreting Vickers microindentation data is proposed, based on continuum mechanics and, more precisely, the Gradient Elasticity framework. The main feature is the elastic properties’ calculation from the initial (elastic) region of the load vs. depth indentation data, which makes the calculation independent of the maximum indentation depth. This approach deviates significantly from the semi-empirical method of Oliver and Pharr, which calculates the material properties (such as elastic modulus and hardness) from the elastic unloading region, with the calculated values of the elastic modulus and hardness being strongly dependent on the indentation depth and, therefore, giving rise to the socalled indentation size effect (ISE). The proposed framework considers the Vickers indentation as a compression test with a complex geometry, as the pyramidal indenter tip applies load to directions perpendicular to its four faces. An elastic displacement field is initially assumed following Boussinesq’s solution before an indent is made, while afterwards the displacement of the material in contact with the tip is assumed to follow the Vickers tip’s geometry. The respective von Mises equivalent strain calculated through a continuum mechanics approach can qualitatively capture thin film delamination micrographs and shear band formation, showing the potential of the present formulation to model such microdeformation problems. The traction vector calculated on each of the four sides of the Vickers tip, leads to the generation of load-displacement data, which compare well with experimental indentation data, with the elastic properties (i.e. elastic modulus) thus calculated being in accordance with the corresponding literature values.
Γλώσσα:	Αγγλικά
Σελίδες:	7
DOI:	10.1016/j.matpr.2022.06.242
ISSN:	2214-7853
Θεματική κατηγορία:	[EL] Μηχανική, γενικά[EN] Engineering, general
Λέξεις-κλειδιά:	indentation; Vickers indentation; Displacement field; stress/strain fields; Gradient elasticity
Κάτοχος πνευματικών δικαιωμάτων:	© 2022 Elsevier Ltd. All rights reserved.
Όροι και προϋποθέσεις δικαιωμάτων:	Published source must be acknowledged with citation. Copyright © 2022 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Conferences & Exhibition on Nanotechnologies, Organic Electronics & Nanomedicine – NANOTEXNOLOGY 2021.
Ηλεκτρονική διεύθυνση του τεκμηρίου στον εκδότη:	https://www.sciencedirect.com/science/article/abs/pii/S2214785322042407
Ηλεκτρονική διεύθυνση περιοδικού:	https://www.sciencedirect.com/journal/materials-today-proceedings
Τίτλος πηγής δημοσίευσης:	Materials Today: Proceedings
Τόμος:	67
Μέρος:	7
Σελίδες τεκμηρίου (στην πηγή):	964-970
Όνομα εκδήλωσης:	18th Int. Conference on Nanosciences & Nanotechnologies
Τοποθεσία εκδήλωσης:	Θεσσαλονίκη, Ελλάδα
Ημ/νία έναρξης εκδήλωσης:	06/07/2021
Ημ/νία λήξης εκδήλωσης:	09/07/2021
Σημειώσεις:	https://www.nanotexnology.com/2021/ This research is co-financed by Greece and the European Union (European Social Fund- ESF) through the Operational Programme ‘‘Human Resources Development, Education and Lifelong Learning 2014-2020” in the context of the project ‘‘Modifying the Conceptual Framework for Nano-Indentation: Application to Thin Films Used in Organic Electronics” (MIS 5047851).
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