Achieving vibration isolation,lightweight design,and reusability under impact remains a critical challenge for thin-walled structures.When the goat skull is subjected to impact,both the outer wall of the sinus and the...Achieving vibration isolation,lightweight design,and reusability under impact remains a critical challenge for thin-walled structures.When the goat skull is subjected to impact,both the outer wall of the sinus and the internal bony struts deform simultaneously to absorb energy and protect intracranial tissues.Inspired by this mechanism,we designed the goat sinus-inspired bio mimetic(GSIB) structure by mimicking the outer wall of the sinus and the internal pillar-like support system.The structure consists of dual coupling beams,including a set of inclined cantilever beams representing the sinus outer wall and vertical support beams simulating the internal bony struts.The GSIB structure was fabricated using Selective Laser Sintering(SLS) 3D printing technology,and its mechanical properties were investigated through a combination of quasi-static compression tests,vibration tests,impact tests,and finite element simulations.Under compressive loading,the inclined cantilever beams buckle to introduce a negative stiffness effect,while the vertical supports enhance overall stiffness.Leveraging the coupling effect between these two components,the structure achieves a long-stroke constant-force response,thereby delivering superior performance in energy absorption and vibration isolation.Additionally,the special deformation mode of the GSIB structure enables it to be reused under impact conditions.It is noteworthy that,compared to the negative stiffness(NS) structure with the same dimensions for repeated buffering proposed in previous studies,the GSIB structure demonstrates an energy absorption capacity reaching 214.3% of that of the NS structure,a reduction in isolation frequency to 58.5%,and an impact acceleration that is only 66.31% of that of the NS structure.Additionally,the plateau stress of the proposed structure increases to 246.07% of that of the NS structure.This novel artificial structure provides a new design strategy for achieving superior energy absorption and impact resistance under repeated impact conditions.展开更多
文摘Achieving vibration isolation,lightweight design,and reusability under impact remains a critical challenge for thin-walled structures.When the goat skull is subjected to impact,both the outer wall of the sinus and the internal bony struts deform simultaneously to absorb energy and protect intracranial tissues.Inspired by this mechanism,we designed the goat sinus-inspired bio mimetic(GSIB) structure by mimicking the outer wall of the sinus and the internal pillar-like support system.The structure consists of dual coupling beams,including a set of inclined cantilever beams representing the sinus outer wall and vertical support beams simulating the internal bony struts.The GSIB structure was fabricated using Selective Laser Sintering(SLS) 3D printing technology,and its mechanical properties were investigated through a combination of quasi-static compression tests,vibration tests,impact tests,and finite element simulations.Under compressive loading,the inclined cantilever beams buckle to introduce a negative stiffness effect,while the vertical supports enhance overall stiffness.Leveraging the coupling effect between these two components,the structure achieves a long-stroke constant-force response,thereby delivering superior performance in energy absorption and vibration isolation.Additionally,the special deformation mode of the GSIB structure enables it to be reused under impact conditions.It is noteworthy that,compared to the negative stiffness(NS) structure with the same dimensions for repeated buffering proposed in previous studies,the GSIB structure demonstrates an energy absorption capacity reaching 214.3% of that of the NS structure,a reduction in isolation frequency to 58.5%,and an impact acceleration that is only 66.31% of that of the NS structure.Additionally,the plateau stress of the proposed structure increases to 246.07% of that of the NS structure.This novel artificial structure provides a new design strategy for achieving superior energy absorption and impact resistance under repeated impact conditions.
