Crushing behavior of curved Nomex honeycombs under combined shear-compression loads

This paper investigated the initial yield behavior of curved honeycombs under combined shear-compression loads with particular attention to the curvature, loading angle, and honeycomb thickness effects. A detailed finite element model was introduced to analyze the mechanical response and deformation mechanism of curved honeycombs and then verified through experiments using a specially designed set-up. It was found that the curvature had a significant effect on the crushing response. As the curvature increased, the initial peak stress reduced by 16.20%. The out-of-plane loading angle ranging from 0 degrees to 15 degrees had little effect on the crushing behavior, whereas it became more pronounced for the angles larger than 15 degrees. In comparison, the effect of inplane loading angle fluctuating between 0 degrees and 60 degrees was more significant. Based on the obtained data, a macroscopic yield criterion for the initial yield stress of curved honeycombs was proposed. A novel inverse parameter identification approach for curved honeycombs was proposed to determine the induced parameters conveniently. The current study gave insight into the performance change of honeycombs with specific curvature and could be used to develop its constitutive models under complex loads.

Automated summary

This paper investigated the initial yield behavior of curved honeycombs under combined shear-compression loads, considering the effects of curvature, loading angle, and honeycomb thickness. The study used a detailed finite element model and experimental verification to analyze the mechanical response and deformation mechanism of curved honeycombs. The results showed that curvature had a significant effect on the crushing response, while the loading angle had a more pronounced effect for larger angles. The study proposed a macroscopic yield criterion and an inverse parameter identification approach for curved honeycombs.