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Study on fatigue-after-impact behavior of honeycomb sandwich panel under cyclic compressive loading
  • Qiangbin Shi,
  • Xuan Wang,
  • Jiayin Dai
Qiangbin Shi
Civil Aviation University of China
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Xuan Wang
Civil Aviation University of China

Corresponding Author:[email protected]

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Jiayin Dai
Civil Aviation University of China
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Abstract

The honeycomb sandwich panel was impacted by hemispherical tip indenters with three different diameters at low-velocity, resulting in the dents depth of 1 mm. Then, the residual compressive strength and compression-compression fatigue tests were carried out to study the residual strength, conditional fatigue limit, energy dissipation, stiffness degradation, cyclic creep and failure modes of the specimens. The results show that the static residual strength decreased with the increase of punch diameter, and when the diameter was 25.4 mm the conditional fatigue limit reached the maximum 68.1% of the static failure load, while the cases of diameter 38.1 mm and 50.8 mm had the conditional fatigue limits of 60% approximately. Dissipated energy, cyclic stiffness and cyclic creep all showed a “three-stage” evolution feature. Compared with the static residual strength, the dispersion of the fatigue residual strength of the specimen was obviously increased. The failure mode of the specimen under fatigue load was similar to the counterpart under static load.