TY - JOUR
T1 - Phase-field modelling of failure in ceramics with multiscale porosity
AU - Cavuoto, R.
AU - Lenarda, P.
AU - Tampieri, A.
AU - Bigoni, D.
AU - Paggi, M.
N1 - Publisher Copyright:
© 2024 The Author(s)
PY - 2024/2
Y1 - 2024/2
N2 - Many stiff biological materials exhibiting outstanding compressive strength/weight ratio are characterized by high porosity, spanning different size-scales, typical examples being bone and wood. A successful bio-mimicking of these materials is provided by a recently obtained apatite, directly produced through a biomorphic transformation of natural wood and thus inheriting its highly hierarchical structure. This unique apatite (but also wood and bone) is characterized by two major distinct populations of differently-sized cylindrical voids, a porosity shown in the present paper to influence failure, both in terms of damage growth and fracture nucleation and propagation. This statement follows from failure analysis, developed through in-silico generation of artificial samples (reproducing the two-scale porosity of the material) and subsequent finite element modelling of damage, implemented with phase-field treatment for fracture growth. It is found that small voids promote damage nucleation and enhance bridging of macro-pores by micro-crack formation, while macro-pores influence the overall material response and drive the propagation of large fractures. Our results explain the important role of multiscale porosity characterizing stiff biological materials and lead to a new design paradigm, by introducing an in-silico tool to implement bio-mimicking in new artificial materials with brittle behaviour, such as carbide or ceramic foams.
AB - Many stiff biological materials exhibiting outstanding compressive strength/weight ratio are characterized by high porosity, spanning different size-scales, typical examples being bone and wood. A successful bio-mimicking of these materials is provided by a recently obtained apatite, directly produced through a biomorphic transformation of natural wood and thus inheriting its highly hierarchical structure. This unique apatite (but also wood and bone) is characterized by two major distinct populations of differently-sized cylindrical voids, a porosity shown in the present paper to influence failure, both in terms of damage growth and fracture nucleation and propagation. This statement follows from failure analysis, developed through in-silico generation of artificial samples (reproducing the two-scale porosity of the material) and subsequent finite element modelling of damage, implemented with phase-field treatment for fracture growth. It is found that small voids promote damage nucleation and enhance bridging of macro-pores by micro-crack formation, while macro-pores influence the overall material response and drive the propagation of large fractures. Our results explain the important role of multiscale porosity characterizing stiff biological materials and lead to a new design paradigm, by introducing an in-silico tool to implement bio-mimicking in new artificial materials with brittle behaviour, such as carbide or ceramic foams.
KW - Bio-mimetic materials
KW - Finite element method
KW - Multiscale porosity
KW - Phase field approach to fracture
KW - Porous materials
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U2 - 10.1016/j.matdes.2024.112708
DO - 10.1016/j.matdes.2024.112708
M3 - Article
AN - SCOPUS:85183940629
SN - 0264-1275
VL - 238
JO - Materials and Design
JF - Materials and Design
M1 - 112708
ER -