Dynamic shear damage with frictional sliding on microcracks

Dynamic shear damage with frictional sliding on microcracks

•A two-scale damage model based on the dynamic propagation of microcracks in shear mode, with frictional contact.•Study of the influence of friction, loading rate, microstructural size on the macroscopic elasto-damage response.•Finite Element simulations of dynamic shear rupture of PMMA samples unde...

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Bibliographic Details
Published in:Engineering fracture mechanics Vol. 236; p. 107188
Main Authors: Atiezo, Megbeme K., Gbetchi, Kokouvi, Dascalu, Cristian
Format: Journal Article
Language:English
Published: New York Elsevier Ltd 01-09-2020
Elsevier BV
Elsevier
Subjects:
Asymptotic homogenization
Brittleness
Computer simulation
Contact and friction
Damage assessment
Damage law
Engineering Sciences
Failure
Impact loads
Impact test
Materials and structures in mechanics
Mathematical models
Mechanics
Mechanics of materials
Microcracks
Microstructure
Mode II dynamic propagation
Shear failure
Size effects
Solid mechanics
Strain rate
Microcracks
Asymptotic homogenization
Shear failure
Mode II dynamic propagation
Contact and friction
Damage law
Impact test
impact test
contact and friction
mode II dynamic propagation
asymptotic homogenization
shear failure
damage law
microcracks
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Summary:•A two-scale damage model based on the dynamic propagation of microcracks in shear mode, with frictional contact.•Study of the influence of friction, loading rate, microstructural size on the macroscopic elasto-damage response.•Finite Element simulations of dynamic shear rupture of PMMA samples under impact loading.•Good agreement between model predictions and experimental observations. A new damage model for rapid shear failure in brittle solids is constructed in the present contribution using a two-scale approach. The model is obtained by asymptotic homogenization from microstructures with dynamically evolving microcracks, in mode II, with unilateral contact and friction conditions on their lips. The analysis of the local effective response of the model reveals strain-rate and microstructural size effects and the influence of the small-scale friction. Results of numerical simulations for mode II brittle failure of PMMA specimens under impact loading are presented and compared with the experimental data. The failure evolution is found to be in good agreement with that reported in the experiments.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2020.107188