TY - JOUR
T1 - Additive Manufacturing and Performance of Architectured Cement-Based Materials
AU - Moini, Mohamadreza
AU - Olek, Jan
AU - Youngblood, Jeffrey P.
AU - Magee, Bryan
AU - Zavattieri, Pablo D.
N1 - Funding Information:
The authors gratefully acknowledge generous support from the National Science Foundation (Grant No. CMMI 1562927) of this research. The authors would also like to thank the BASF chemicals company for providing materials. The authors also acknowledge fruitful discussions with other members of the collaborative NSF project, Dr. Florence Sanchez of Vanderbilt University and Dr. Joseph Biernacki of the Tennessee Technological University.
Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/10/25
Y1 - 2018/10/25
N2 - There is an increasing interest in hierarchical design and additive manufacturing (AM) of cement-based materials. However, the brittle behavior of these materials and the presence of interfaces from the AM process currently present a major challenge. Contrary to the commonly adopted approach in AM of cement-based materials to eliminate the interfaces in 3D-printed hardened cement paste (hcp) elements, this work focuses on harnessing the heterogeneous interfaces by employing novel architectures (based on bioinspired Bouligand structures). These architectures are found to generate unique damage mechanisms, which allow inherently brittle hcp materials to attain flaw-tolerant properties and novel performance characteristics. It is hypothesized that combining heterogeneous interfaces with carefully designed architectures promotes such damage mechanisms as, among others, interfacial microcracking and crack twisting. This, in turn, leads to damage delocalization in brittle 3D-printed architectured hcp and therefore results in quasi-brittle behavior, enhanced fracture and damage tolerance, and unique load-displacement response, all without sacrificing strength. It is further found that in addition to delocalization of the cracks, the Bouligand architectures can also enhance work of failure and inelastic deflection of the architectured hcp elements by over 50% when compared to traditionally cast elements from the same materials.
AB - There is an increasing interest in hierarchical design and additive manufacturing (AM) of cement-based materials. However, the brittle behavior of these materials and the presence of interfaces from the AM process currently present a major challenge. Contrary to the commonly adopted approach in AM of cement-based materials to eliminate the interfaces in 3D-printed hardened cement paste (hcp) elements, this work focuses on harnessing the heterogeneous interfaces by employing novel architectures (based on bioinspired Bouligand structures). These architectures are found to generate unique damage mechanisms, which allow inherently brittle hcp materials to attain flaw-tolerant properties and novel performance characteristics. It is hypothesized that combining heterogeneous interfaces with carefully designed architectures promotes such damage mechanisms as, among others, interfacial microcracking and crack twisting. This, in turn, leads to damage delocalization in brittle 3D-printed architectured hcp and therefore results in quasi-brittle behavior, enhanced fracture and damage tolerance, and unique load-displacement response, all without sacrificing strength. It is further found that in addition to delocalization of the cracks, the Bouligand architectures can also enhance work of failure and inelastic deflection of the architectured hcp elements by over 50% when compared to traditionally cast elements from the same materials.
KW - architectured materials
KW - direct ink writing
KW - hardened cement paste
KW - interfaces
KW - mechanical response
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U2 - 10.1002/adma.201802123
DO - 10.1002/adma.201802123
M3 - Article
C2 - 30159935
AN - SCOPUS:85052704414
SN - 0935-9648
VL - 30
JO - Advanced Materials
JF - Advanced Materials
IS - 43
M1 - 1802123
ER -