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<p>Carbon fiber reinforced polymer (CFRP) sandwich structures possess excellent mechanical properties and have been gradually applied in engineering. However, their repetitive energy absorption characteristic and damage repair are important aspects that need to be taken into consideration. In this paper, a novel musculoskeletal biomimetic metastructure (MBM) inspired by the musculoskeletal system is designed and fabricated. This structure combines the advantages of flexible and brittle materials. In addition, the self-adjusting deformation function provides reliable stability to the structure. The design of the replaceable bionic skeletal system (BSS) simplifies the subsequent maintenance process. To investigate the mechanical properties of the MBM, single and multiple compression experiments were carried out. The energy absorption and deformation mechanisms were analyzed. Microscopic crack propagation was observed using an ultra-depth-of-field microscope. The results indicated that the MBM exhibited an obvious adaptive deformation coordination function and great mechanical properties. The equivalent elastic modulus and specific energy absorption of the MBM increased by 583 and 72%, respectively, compared to those of the 3D-printed sample. The rotation angle of the MBM was 94% smaller than that of the 3D-printed sample. At the same time, the samples maintained their initial load-bearing capacity after replacing the damaged BSS, whereas those without replacing the damaged BSS lost most of it. In summary, this design method is expected to promote the widespread application of CFRP sandwich structures in engineering.</p>

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The Energy Absorption Enhancement and Self-Adjusting Deformation of Musculoskeletal Biomimetic Metastructures Under Multiple Compressions

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Zhikang Liu,
  • Xin Fu,
  • Jiayi Liu,
  • Wei Huang

摘要

Carbon fiber reinforced polymer (CFRP) sandwich structures possess excellent mechanical properties and have been gradually applied in engineering. However, their repetitive energy absorption characteristic and damage repair are important aspects that need to be taken into consideration. In this paper, a novel musculoskeletal biomimetic metastructure (MBM) inspired by the musculoskeletal system is designed and fabricated. This structure combines the advantages of flexible and brittle materials. In addition, the self-adjusting deformation function provides reliable stability to the structure. The design of the replaceable bionic skeletal system (BSS) simplifies the subsequent maintenance process. To investigate the mechanical properties of the MBM, single and multiple compression experiments were carried out. The energy absorption and deformation mechanisms were analyzed. Microscopic crack propagation was observed using an ultra-depth-of-field microscope. The results indicated that the MBM exhibited an obvious adaptive deformation coordination function and great mechanical properties. The equivalent elastic modulus and specific energy absorption of the MBM increased by 583 and 72%, respectively, compared to those of the 3D-printed sample. The rotation angle of the MBM was 94% smaller than that of the 3D-printed sample. At the same time, the samples maintained their initial load-bearing capacity after replacing the damaged BSS, whereas those without replacing the damaged BSS lost most of it. In summary, this design method is expected to promote the widespread application of CFRP sandwich structures in engineering.