TY - JOUR
T1 - Dynamic simulations of traditional masonry materials at different loading rates using an enriched damage delay
T2 - Theory and practical applications
AU - Li Piani, T.
AU - Weerheijm, J.
AU - Sluys, L. J.
N1 - Accepted author manuscript
PY - 2019
Y1 - 2019
N2 - A local damage model has been recently developed for the numerical simulation of the static behaviour of adobe bricks. Mesh insensitivity of the local model was obtained by generalizing the damage delay concept based on a Dirichlet boundary condition decomposition integrated in an implicit solver. The regularization properties of the model were proven before only in statics. In this study, mesh independence is demonstrated in dynamics analysing the problem of a cantilever bar uniaxially loaded at high deformation rates. Furthermore, the physical background of the delay formulation is interpreted regarding the main failure processes in compression exhibited by quasi brittle materials used in masonry. Two limitations of the model in correctly simulating the dynamic behaviour of masonry bricks have been observed. Corrections to the original damage delay formulation are proposed in this study. These enhance the capability of the model to address also distributed failure of traditional geo-materials and the inherent rate dependence also at high strain rate regimes. The improvements are demonstrated in this paper by means of numerical simulations of both theoretical tests and practical applications. These consist of experimental tests in compression recently performed by the authors at different strain rates, from statics to high velocity impact tests.
AB - A local damage model has been recently developed for the numerical simulation of the static behaviour of adobe bricks. Mesh insensitivity of the local model was obtained by generalizing the damage delay concept based on a Dirichlet boundary condition decomposition integrated in an implicit solver. The regularization properties of the model were proven before only in statics. In this study, mesh independence is demonstrated in dynamics analysing the problem of a cantilever bar uniaxially loaded at high deformation rates. Furthermore, the physical background of the delay formulation is interpreted regarding the main failure processes in compression exhibited by quasi brittle materials used in masonry. Two limitations of the model in correctly simulating the dynamic behaviour of masonry bricks have been observed. Corrections to the original damage delay formulation are proposed in this study. These enhance the capability of the model to address also distributed failure of traditional geo-materials and the inherent rate dependence also at high strain rate regimes. The improvements are demonstrated in this paper by means of numerical simulations of both theoretical tests and practical applications. These consist of experimental tests in compression recently performed by the authors at different strain rates, from statics to high velocity impact tests.
KW - Adobe
KW - Dynamic increase factor
KW - High velocity impact and strain rate
KW - Mesh dependence
KW - Quasi brittle and ductile materials
UR - http://www.scopus.com/inward/record.url?scp=85070085786&partnerID=8YFLogxK
U2 - 10.1016/j.engfracmech.2019.106576
DO - 10.1016/j.engfracmech.2019.106576
M3 - Article
AN - SCOPUS:85070085786
SN - 0013-7944
VL - 218
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
M1 - 106576
ER -