Deformation and fracture of lithosphere-inspired polymeric multi-layer composites
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In: Results in Engineering, Vol. 24.2024, No. December, 103519, 12.2024.
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TY - JOUR
T1 - Deformation and fracture of lithosphere-inspired polymeric multi-layer composites
AU - Waly, Christoph
AU - Höller, Rita
AU - Griesser, Thomas
AU - Arbeiter, Florian
N1 - Publisher Copyright: © 2024
PY - 2024/12
Y1 - 2024/12
N2 - Inspired by the diversity of structures and patterns inherent in the earth's lithosphere, this study endeavors to enhance the interplay between stiffness and toughness through the introduction of a new class of polymeric multi-layer composite materials termed by the authors as "lithomers". Structured single-edge notched bending specimens were fabricated using a combination of additive manufacturing and casting, employing two different methacrylate-thiol resins. The outer layers exhibit a stiff and brittle characteristic, while the layer in between is compliant in nature. Three types of lithomers with wave-like structures and one with a rectilinear structure were investigated regarding their stiffness and toughness in a 3-point bending setup. The results were compared with those of a pure stiff matrix material. The findings revealed that fracture toughness increased regardless of the interlayer's shape compared to the pure matrix material. Correspondingly, this enhancement in fracture toughness correlated with a reduction in stiffness. The most balanced results in terms of stiffness and fracture toughness were achieved, with the lithomer having a wave-like structure in its initial stage. It exhibited a roughly 27 times improvement in fracture toughness with a moderate decrease in stiffness of approx. 1/5 compared to the pure matrix material.
AB - Inspired by the diversity of structures and patterns inherent in the earth's lithosphere, this study endeavors to enhance the interplay between stiffness and toughness through the introduction of a new class of polymeric multi-layer composite materials termed by the authors as "lithomers". Structured single-edge notched bending specimens were fabricated using a combination of additive manufacturing and casting, employing two different methacrylate-thiol resins. The outer layers exhibit a stiff and brittle characteristic, while the layer in between is compliant in nature. Three types of lithomers with wave-like structures and one with a rectilinear structure were investigated regarding their stiffness and toughness in a 3-point bending setup. The results were compared with those of a pure stiff matrix material. The findings revealed that fracture toughness increased regardless of the interlayer's shape compared to the pure matrix material. Correspondingly, this enhancement in fracture toughness correlated with a reduction in stiffness. The most balanced results in terms of stiffness and fracture toughness were achieved, with the lithomer having a wave-like structure in its initial stage. It exhibited a roughly 27 times improvement in fracture toughness with a moderate decrease in stiffness of approx. 1/5 compared to the pure matrix material.
KW - Biomimetics
KW - Fracture toughness
KW - Lithomers
KW - Lithomimetics
KW - Multi-layered structure
UR - http://www.scopus.com/inward/record.url?scp=85210136011&partnerID=8YFLogxK
U2 - 10.1016/j.rineng.2024.103519
DO - 10.1016/j.rineng.2024.103519
M3 - Article
AN - SCOPUS:85210136011
VL - 24.2024
JO - Results in Engineering
JF - Results in Engineering
SN - 2590-1230
IS - December
M1 - 103519
ER -