In this chapter, we will review the FIB-based methods for understanding the role of residual stresses on the mechanical behavior of thin films and coatings. Basing on the concept that residual stress may affect remarkably the crack propagation mechanisms, the idea of pillar milling for controlled stress relaxation is introduced. On this base, two possible approaches are possible: (1) using digital image correlation (DIC) to map the relaxation strain and then calculate the residual stress depth profile (microring-core method), and (2) performing a sharp nanoindentation at pillar’s center to evaluate fracture toughness (pillar splitting method). The recent advances of the two methodologies are reviewed, and limitations/applications are comprehensively discussed.
Sebastiani, M., Rossi, E., Rashid, S. (2024). Nanomechanical testing methods to understand the effects of residual stress on coating’s performance. In Nanomechanics for Coatings and Engineering Surfaces: Test Methods, Development Strategies, Modeling Approaches, and Applications (pp. 271-300). Elsevier [10.1016/B978-0-443-13334-3.00010-3].
Nanomechanical testing methods to understand the effects of residual stress on coating’s performance
Sebastiani M.Methodology
;Rossi E.Writing – Original Draft Preparation
;Rashid S.Writing – Review & Editing
2024-01-01
Abstract
In this chapter, we will review the FIB-based methods for understanding the role of residual stresses on the mechanical behavior of thin films and coatings. Basing on the concept that residual stress may affect remarkably the crack propagation mechanisms, the idea of pillar milling for controlled stress relaxation is introduced. On this base, two possible approaches are possible: (1) using digital image correlation (DIC) to map the relaxation strain and then calculate the residual stress depth profile (microring-core method), and (2) performing a sharp nanoindentation at pillar’s center to evaluate fracture toughness (pillar splitting method). The recent advances of the two methodologies are reviewed, and limitations/applications are comprehensively discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
