Development of liquid crystal elastomer damping materials
Liquid crystal elastomers(LCEs)exhibit a distinctive damping mechanism and excellent energy dissipation behavior in the field of damping,owning to their unique dynamic mechanical properties—"soft elasticity".Under external forces,the mesogens can change their directions and absorb external energy,achieving effective damping behavior.Compared with traditional polymers,LCE has higher damping factor and broader effective damping temperature range,enabling them effective application in various environments.The"rate-dependent behavior"of LCEs also endows them with superior mechanical performance and energy absorption abilities under high strain rate conditions,and thus they can be used to construct new types of high-impact resistance equipment.The monodomain liquid crystal elastomer is uniformly orientated,which exhibits superior damping properties compared to polydomain liquid crystal elastomer.With the help of 3D printing technology,bulk monodomain liquid crystal elastomer can also be prepared.In the separated Hopkinson bar experiment and shaking table experiment tests,liquid crystal elastomers have shown superior energy absorption abilities compared to traditional polymer materials.Utilizing advanced processing techniques,LCEs can also be fabricated into various lightweight and high-performance structures.This paper provides an overview of the damping mechanism,damping characteristics,and dynamic mechanical properties of LCEs,and discusses their challenges and opportunities in the field of damping.
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