Abstract
To study the compressive mechanical properties of a new type of brazed aluminum honeycomb plate (BAHP), tensile tests on single- and brazed-cell walls as well as compression tests in the out-of-plane, in-plane longitudinal, and transverse directions were conducted. Compared to the material properties of a traditional glued aluminum honeycomb plate (GAHP), those of the single- and brazed-cell walls of the BAHP are entirely different. Therefore, their characteristics should be considered separately when performing theoretical and simulation analysis. Under out-of-plane compression, the core of the BAHP did not debond, owing to its higher strength than that of the GAHP. In comparison, under in-plane compression in the longitudinal and transverse directions, the load–displacement characteristics, ultimate load, and failure modes also differed, and there was no large-scale cracking. Considering the characteristics of the BAHP, a strength prediction method was proposed. The simulation results demonstrated that the model built based on the new method was highly consistent with the experimental results. Defects with uneven height and debonding will cause the overall instability, and the degree of defects will influence the strength and instability displacement, which have little impact on the elastic stage. Moreover, the model considering defects is closer to the test results.
Highlights
Owing to their high strength and low weight, aluminum honeycomb sandwich structures have been extensively used in rail transportation, aerospace, and other fields, in recent decades, and have developed rapidly
By comparing the tensile stress–strain curves of the single-cell and ten-brazed-cell wall a simplified strength theory for predicting the out-of-plane compressive strength of the brazed aluminum honeycomb plate (BAHP) is presented in Section 2, it can be seen that the single-cell wall material of the hypotenuse wall and proposed
8b demonstrates, theispanel will be wrinkled under in-plane compression, which is basically consistent with the test results
Summary
Owing to their high strength and low weight, aluminum honeycomb sandwich structures have been extensively used in rail transportation, aerospace, and other fields, in recent decades, and have developed rapidly. The manufacturing process of aluminum honeycomb plates is being continually developed. A new manufacturing method recently applied in engineering has led to the formation of brazed aluminum honeycomb plates (BAHPs). Using the brazing technique significantly increases the interfacial strength, the mechanical properties, failure mechanism, simulation method, and theoretical strength prediction need to be further studied. The research on aluminum honeycomb structures in academia is mainly concentrated on GAHPs, this can provide the basis and methods for studies on BAHPs. Bai et al [4,5,6]
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