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The influence of cell geometries on the quasi-static crush behaviors of aluminum honeycombs is explored by experiments. Aluminum 5052-H38 honeycomb specimens with different in-plane orientation angles, cell wall thicknesses and cell sizes were tested under compression dominant combined loads. The load histories of these specimens were obtained. A quadratic and a linear phenomenological yield criteria are used to fit the obtained experimental normal crush and shear strengths for three types of honeycomb specimens under compression dominant combined loads. The quadratic yield criterion is used to fit the experimental results for two types of honeycomb specimens with low relative densities. The linear yield criterion is used to fit the experimental results for one type of honeycomb specimens with a high relative density.

The quasi-static crush behavior of aluminum 5052-H38 honeycomb specimens under non-proportional compression dominant combined loads is investigated by experiments. Compression dominant combined loads and pure compressive loads were applied in different sequences to induce non-proportional combined loads. The experimental results show that the normal crush and shear strengths in combined loading regions and the normal crush strengths in pure compressive loading regions of the non-proportional combined loads are quite consistent with the existing phenomenological yield criterion based on the experimental normal crush and shear strengths under proportional combined loads. The experimental results indicate that the sequence of loading paths for the non-proportional combined loads does not affect the crush strengths of honeycomb specimens.