Impact load mitigation in sandwich beams using local resonators

TL;DR

This study investigates how embedding local resonators in sandwich beams can effectively reduce impact loads and improve flexural behavior, with finite element analysis and experimental validation showing the importance of resonator frequency selection.

Contribution

The paper introduces a novel approach of using embedded local resonators in sandwich beams to mitigate impact loads, supported by finite element modeling and experimental verification.

Findings

Embedded resonators improve impact load response.

Optimal resonator frequency depends on impact duration.

Finite element models match experimental results.

Abstract

Dynamic response of sandwich beams with resonators embedded in the cores subjected to impact loads is studied. Using finite element models the effectiveness of various local resonator frequencies under a given impact load is compared to the behavior of an equivalent mass beam. It is shown that addition of appropriately chosen local resonators into the sandwich beam is an effective method of improving its flexural bending behavior under impact loads. The effect of a given local resonance frequency under different impact load durations is also studied. It is demonstrated that the choice of appropriate local resonance frequency depends on the impact duration. Further, by performing transverse impact experiments, the finite element models are verified and the advantage of using internal resonators under impact loading conditions is demonstrated.