Shear traction‐separation laws of European beech under mode II loading by 3D digital image correlation

José Luis Gómez-Royuela, Almudena Majano-Majano, Antonio José Lara-Bocanegra, José Xavier, M. F. S. F. de Moura

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
5 Downloads (Pure)

Abstract

An experimental and numerical study on mode II fracture behaviour of European beech (Fagus sylvatica L.) in the RL and TL crack propagation systems is performed. It is a hardwood species that has attracted increasing interest for structural use in Europe in recent years. Three-point end notched flexure tests are performed. The R-curves of both crack propagation systems are obtained, from which the critical strain energy release rate (GIIc) is derived by applying the compliance-based beam method. This data reduction scheme avoids crack length monitoring during its propagation, which is an advantage in wood. Using a direct method, the shear traction‐separation laws in mode II loading are determined. Full field displacements around the crack tip are monitored by 3D digital image correlation technique, and the crack tip shear displacements are analysed. The proposed method is numerically validated by finite element analysis. Cohesive zone models are developed implementing a shear traction–separation law with exponential damage evolution zone and the average value of the experimental elastic and fracture properties. The numerical results for the different properties including upper and lower limits represent well the experimental data.

Original languageEnglish
Pages (from-to)1631–1655
Number of pages25
JournalWood Science And Technology
Volume56
Early online date21 Nov 2022
DOIs
Publication statusPublished - 21 Nov 2022

Keywords

  • Crack propagation
  • Image correlation
  • Separation
  • Strain energy
  • Strain measurement
  • Strain rate
  • Crack tips
  • 3d digital image correlations
  • Beech (Fagus sylvatica L.)
  • Cracks propagation
  • European beech

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