Abstract
This paper presents an experimental investigation on the yield behavior of Nomex honeycombs under combined shearcompression with regard to out-of-plane direction. Four different types of specimens were designed in order to investigate the influence of in-plane orientation angle on the yield behavior of honeycombs under combined loads. Two different failure modes of honeycomb specimens, i.e. the plastic buckling and the extension fracture of cell walls, are observed under combined shear-compression. The experimental results validate that the in-plane orientation angle has a significant influence on the developments of the experimental yield surface. The experimental yield surfaces are compared with a phenomenological yield criterion capable of accounting for anisotropic behavior. The comparative analytical results indicate the experimental yield surfaces are approximately consistent with the theoretical yield surfaces in the normal-shear stress space. These experimental results are useful to develop constitutive models of Nomex honeycombs under combined shear-compression.
Highlights
The honeycombs usually serve as cushioning structures and have many actual applications in the domains of aviation, packaging, transportation, construction, mainly on account of excellent energy-absorbing properties
The type U specimens were first employed in the out-of-plane compression tests
The compressive strength of honeycombs with regard to the out-of-plane direction was determinated by the out-of-plane compression tests
Summary
The honeycombs usually serve as cushioning structures and have many actual applications in the domains of aviation, packaging, transportation, construction, mainly on account of excellent energy-absorbing properties. In these applications, the honeycombs may be subjected to multiaxial loads. The macroscopic stress distributions and the failure modes of honeycombs are complicated under multiaxial loading conditions. The honeycombs are designed to carry loads with regard to out-of-plane direction, which is the strongest material symmetry direction. It is important to model accurately the failure behavior of honeycombs under multiaxial load-
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