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Mesoscale modelling of concrete under high strain rate tension with a rate-dependent cohesive interface approach

journal contribution
posted on 13.01.2020 by Rongxin Zhou, Han-Mei Chen, Yong Lu
This paper presents the investigation of the dynamic behaviour of concrete material under high strain rate tension using an interface approach in a mesoscale model framework. A ratedependent cohesive constitutive description is introduced into the mesoscale framework to account for the effects of viscosity occurring in the dynamic fracture process. An algorithm is developed to insert cohesive elements throughout the mesoscale mesh grids in a concrete specimen, and to identify the cohesive element properties based on the original mesoscale structure. After parameter studies in terms of the cohesive element properties, the proposed model is validated against representative experimental data. The model is then employed to 2 investigate the dynamic tensile behaviour of concrete under high strain rates. The underlying mechanisms of the dynamic tensile strength increase of concrete, including the influence of viscous effect from rate-dependent material description, the inertial effect from cracking and the material heterogeneity, are discussed and identified respectively. Results demonstrate that the viscous effect should be incorporated into the cohesive constitutive law to account for the Stefan effect at low and moderate strain rates and the micro-crack inertial effect only plays a significant role at a relatively high strain rate. Material heterogeneity does influence the strength enhancement under dynamic loading and the significance of this effect increases with the strain rate.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

International Journal of Impact Engineering

Volume

139

Issue

May 2020

Publisher

Elsevier BV

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal International Journal of Impact Engineering and the definitive published version is available at https://doi.org/10.1016/j.ijimpeng.2020.103500

Acceptance date

06/01/2020

Publication date

2020-01-07

ISSN

0734-743X

Language

en

Depositor

Dr Rongxin Zhou Deposit date: 10 January 2020

Article number

103500

Exports