A grain-scale formulation for high-cycle fatigue inter-granular degradation in polycrystalline aggregates is presented. The aggregate is represented through Voronoi tessellations and the mechanics of individual bulk grains is modelled using a boundary integral formulation. The inter-granular interfaces degrade under the action of cyclic tractions and they are represented using cohesive laws embodying a local irreversible damage parameter that evolves according to high- cycle continuum damage laws. The consistence between cyclic and static damage, which plays an important role in the redistribution of inter-granular tractions upon cyclic degradation, is assessed at each fatigue solution jump, so to capture the onset of macro-failure. Few polycrystalline aggregates are tested using the developed technique, which may find application in multiscale modelling of engineering components as well as in the design of micro-electro-mechanical devices (MEMS).

Benedetti I., Gulizzi V. (2018). A Model for high-cycle fatigue in polycrystals. In Key Engineering Materials - Advances in Fracture and Damage Mechanics XVII (pp. 391-397). Trans Tech Publications Ltd [10.4028/www.scientific.net/KEM.774.391].

A Model for high-cycle fatigue in polycrystals

Benedetti I.;Gulizzi V.
2018-01-01

Abstract

A grain-scale formulation for high-cycle fatigue inter-granular degradation in polycrystalline aggregates is presented. The aggregate is represented through Voronoi tessellations and the mechanics of individual bulk grains is modelled using a boundary integral formulation. The inter-granular interfaces degrade under the action of cyclic tractions and they are represented using cohesive laws embodying a local irreversible damage parameter that evolves according to high- cycle continuum damage laws. The consistence between cyclic and static damage, which plays an important role in the redistribution of inter-granular tractions upon cyclic degradation, is assessed at each fatigue solution jump, so to capture the onset of macro-failure. Few polycrystalline aggregates are tested using the developed technique, which may find application in multiscale modelling of engineering components as well as in the design of micro-electro-mechanical devices (MEMS).
Settore ING-IND/04 - Costruzioni E Strutture Aerospaziali
http://www.scientific.net/
Benedetti I., Gulizzi V. (2018). A Model for high-cycle fatigue in polycrystals. In Key Engineering Materials - Advances in Fracture and Damage Mechanics XVII (pp. 391-397). Trans Tech Publications Ltd [10.4028/www.scientific.net/KEM.774.391].
File in questo prodotto:
File Dimensione Formato  
2018 - KEM - FTG.pdf

Solo gestori archvio

Tipologia: Versione Editoriale
Dimensione 781.7 kB
Formato Adobe PDF
781.7 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/375632
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? ND
social impact