TY - GEN
T1 - Experiments and numerical simulations of interlocked materials
AU - Brugger, Charles
AU - Brechet, Yves
AU - Fivel, Marc
PY - 2008
Y1 - 2008
N2 - Interlocked materials are new examples of "hybrid materials", mixing materials and structures at a millimetric scale. They consist of periodic assemblies of elementary blocks with specific shapes, maintained in contact by compressive boundary conditions. These "pre-fragmented materials" can simultaneously fulfil antagonistic properties such as high strength together with good damage tolerance. We performed indentation tests on two different structures: (i) an assembly of osteomorphic ice blocks and (ii) an assembly of plaster made cubes. The tests being performed up to the failure, it is found that these structures dissipate much more mechanical energy than similar monolithic plates and preserve their integrity up to much larger deformation. A numerical modelling is then developed in order to reproduce this behaviour. Using finite elements, we simulated the friction contact between two elastic cubes or blocks, for a given lateral load and friction coefficient. The outputs are then introduced as local contact rules in a "Discrete Elements code" specially developed for this study. The discrete code is then used to model the elastic and damage behaviour of assemblies of cubes or osteomorphic blocks. The comparison with experimental results is satisfactory. Finally, the code is used to model larger assemblies of interlocked structures for which the force path is analysed.
AB - Interlocked materials are new examples of "hybrid materials", mixing materials and structures at a millimetric scale. They consist of periodic assemblies of elementary blocks with specific shapes, maintained in contact by compressive boundary conditions. These "pre-fragmented materials" can simultaneously fulfil antagonistic properties such as high strength together with good damage tolerance. We performed indentation tests on two different structures: (i) an assembly of osteomorphic ice blocks and (ii) an assembly of plaster made cubes. The tests being performed up to the failure, it is found that these structures dissipate much more mechanical energy than similar monolithic plates and preserve their integrity up to much larger deformation. A numerical modelling is then developed in order to reproduce this behaviour. Using finite elements, we simulated the friction contact between two elastic cubes or blocks, for a given lateral load and friction coefficient. The outputs are then introduced as local contact rules in a "Discrete Elements code" specially developed for this study. The discrete code is then used to model the elastic and damage behaviour of assemblies of cubes or osteomorphic blocks. The comparison with experimental results is satisfactory. Finally, the code is used to model larger assemblies of interlocked structures for which the force path is analysed.
KW - Discrete elements method
KW - Friction
KW - Indentation
KW - Interlocked materials
UR - http://www.scopus.com/inward/record.url?scp=56349157429&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/amr.47-50.125
DO - 10.4028/www.scientific.net/amr.47-50.125
M3 - Conference Paper
AN - SCOPUS:56349157429
SN - 0878493786
SN - 9780878493784
T3 - Advanced Materials Research
SP - 125
EP - 128
BT - Multi-functional Materials and Structures - International Conference on Multifunctional Materials and Structures
PB - Trans Tech Publications
T2 - International Conference on Multifunctional Materials and Structures 2008
Y2 - 28 July 2008 through 31 July 2008
ER -