Rotational 3D printing of damage-tolerant composites with programmable mechanics

Raney, Jordan R.; Compton, Brett G.; Mueller, J. Howard; Ober, Thomas J.; Shea, Kristina; Lewis, Jennifer A.

doi:10.1073/pnas.1715157115

Cited by 236 publications

(154 citation statements)

References 38 publications

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“…Figure b shows printing of the SR composite with 10 wt% cotton fibers (SR‐CL10) from a 400 µm nozzle and (inset) a cellular structure printed via this process. The composite inks are shear‐thinning (Figure S1, Supporting Information) and possesses a viscoelastic yield stress (Figure c), as desired for direct write processes . Whether the material can be easily extruded and subsequently maintain its shape after extrusion depends most strongly on the quantity of water (Figure S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

3D Printing of Amylopectin‐Based Natural Fiber Composites

Jiang

Raney

2019

Adv Materials Technologies

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Many ancient Chinese structures, such as portions of the Great Wall, use a unique mortar that derives from glutinous rice (commonly called “sticky rice”). Unlike other types of rice, sticky rice is rich in amylopectin with negligible amylose. Inspired by the long‐term stability of the amylopectin‐based mortars in ancient structures, sticky rice (SR)‐based materials for 3D printing are developed. Heat causes amylopectin gelatinization, during which molecular branches open to form a large network of gel balls. This causes a merger of the granules and improved interaction between the matrix and fillers. To enhance the mechanical properties, cotton fibers are included, ≈11 µm in diameter. During amylopectin gelatinization, secondary fibers emerge from the primary fibers, creating a complex two‐level fiber network. Both the fibers and matrix constitute a 3D printable fiber composite consisting entirely of natural, inexpensive, and scalable components. The processing steps make no use of any non‐natural materials or hazardous chemicals. A systematic design of experiments is conducted to understand the effect of processing parameters on the mechanical properties. Scalability by printing low‐density cellular materials is demonstrated. Finally, it is shown that SR composites are more resilient than common thermoplastic composites when subjected to flame, heat, or ultraviolet light.

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Section: Resultsmentioning

confidence: 99%

3D Printing of Amylopectin‐Based Natural Fiber Composites

Jiang

Raney

2019

Adv Materials Technologies

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“…This assembly is recurrently found in the endoskeletons and exoskeletons of mammals and invertebrates 16,17 and is closely related to outstanding mechanical performance with unprecedented impact resistance. [18][19][20] The fabrication of such exquisite variation in local texture has been recently achieved in composite materials up to 50 vol% mineral content using additive manufacturing methods based on three-dimensional (3D) printing [21][22][23][24] or magnetic alignment with slip casting (MASC). 25 These latest efforts to bring complex heterogeneous texture into polymer/ceramic composites have not yet reached dense ceramics.…”

Section: Introductionmentioning

confidence: 99%

Processing of dense bioinspired ceramics with deliberate microstructure

Ferrand

Bouville

2019

J Am Ceram Soc

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The architectures of biological hard materials reveal finely tailored complex assemblies of mineral crystals. Numerous recent studies associate the design of these local assemblies with impressive macroscopic response. Reproducing such exquisite control in technical ceramics conflicts with commonly used processing methods. Here, we circumvent this issue by combining the recently developed Magnetically Assisted Slip Casting (MASC) technique with the well‐established process of templated grain growth (TGG). MASC enables the local control over the orientation of platelets dispersed among smaller isotropic particles. After a high‐temperature pressureless heat treatment, the grains of the final ceramic follow the same orientation as of the initial platelets. This combination allows us to produce 95% dense alumina part with a grain orientation following any deliberate orientation. We successfully fabricated microstructures inspired from biological materials with ceramics that present periodically varying patterns with a programmable pitch down to a few tens of micrometers. The periodically textured dense ceramics exhibit matching variation of local hardness, confirming the capacity of the process to tailor local properties. This unique micrometer scale control over the local mechanical properties could be applied to adapt ceramic structures to complex loads using this inexpensive and scalable process. In systems where functional properties also depend on anisotropic grain orientation, the principle presented here could enable the creation of new multifunctional ceramics.

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“…This concept was already demonstrated for the 3D printing of carbon fiber–epoxy resins composites, which yielded the carbon fibers aligned toward the extrusion direction. Interestingly, by applying a rotation of the printhead along its longitudinal axis, the resulting printed filament had the microfibers adopting a random‐like and isotropic orientation, following the pattern of rotation . Exploiting this effect can help creating printed constructs with tunable anisotropic/isotropic mechanical properties and topographical cues, even creating regions with diverse properties within the same construct.…”

Section: Strategies To Evolve From Shape To Functionmentioning

confidence: 99%

From Shape to Function: The Next Step in Bioprinting

et al. 2020

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In 2013, the “biofabrication window” was introduced to reflect the processing challenge for the fields of biofabrication and bioprinting. At that time, the lack of printable materials that could serve as cell‐laden bioinks, as well as the limitations of printing and assembly methods, presented a major constraint. However, recent developments have now resulted in the availability of a plethora of bioinks, new printing approaches, and the technological advancement of established techniques. Nevertheless, it remains largely unknown which materials and technical parameters are essential for the fabrication of intrinsically hierarchical cell–material constructs that truly mimic biologically functional tissue. In order to achieve this, it is urged that the field now shift its focus from materials and technologies toward the biological development of the resulting constructs. Therefore, herein, the recent material and technological advances since the introduction of the biofabrication window are briefly summarized, i.e., approaches how to generate shape, to then focus the discussion on how to acquire the biological function within this context. In particular, a vision of how biological function can evolve from the possibility to determine shape is outlined.

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Rotational 3D printing of damage-tolerant composites with programmable mechanics

Cited by 236 publications

References 38 publications

3D Printing of Amylopectin‐Based Natural Fiber Composites

3D Printing of Amylopectin‐Based Natural Fiber Composites

Processing of dense bioinspired ceramics with deliberate microstructure

From Shape to Function: The Next Step in Bioprinting

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