Mechanical properties of a polyborosiloxane-based viscous damper

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (22) : 203-208.

CHEN Qian1,LI Feng1,2,GAO Shuangquan3

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Abstract

Viscous damper is a kind of velocity dependent energy dissipation damping device whose shock absorption performance is determined by the physical properties of the damping medium inside the structure.Polyborosiloxane (PBDMS) is a sort of silicone polymer material that has received widespread attention due to its potential as a damping medium for viscous dampers, but its poor mechanical properties have limited its widespread use.The research group modified PBDMS by doping silica and dimethicone to form the nonlinear damping characteristics required by viscous dampers, and to improve its mechanical properties and stability.The rheological properties, thermodynamic properties, and dynamic properties of the damper were tested and analyzed.The results show that PBDMS modified by silica can not only have no effect on the viscous flow temperature of the material, but also makes the material have excellent mechanical properties.However, after working for a period of time, the mechanical properties of the damping material have not changed, showing good reversibility.Using plasticized PBDMS as the damping medium of the viscous damper,the viscous damping characteristic of nonlinear relationship between damping force and velocity can be obtained.Under the same conditions,the damping performance and safety of this kind of nonlinear viscous damper are better.

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Polyborosiloxane / nonlinear damping materials / nonlinear viscous damper / energy dissipation damping device

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CHEN Qian1,LI Feng1,2,GAO Shuangquan3. Mechanical properties of a polyborosiloxane-based viscous damper[J]. Journal of Vibration and Shock, 2021, 40(22): 203-208

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