Effect of Unbonded Joints in an Aluminum Honeycomb-Core Material for Sandwich Constructions

摘要

Static shear, fatigue shear, and compression tests were made on an aluminum honeycomb-core material. Bending and compression tests were mode on sandwich panels having this core material and aluminum facings. The bonds between the honeycomb cells of some of the core material were completely removed. The modulus of rigidity and the shear strength of the unbonded material were found to be about 70 percent of those of the well-bonded material. Calculated values, taking into consideration the stress concentrations in the neighborhood of the unbonded joints, lead to substantially the same value. Results of shear fatigue tests of the core material are substantially consistent with the shear-strength values obtained from the static shear tests. The compressive strength of the unbonded material is about 50 percent of that of the well-bonded material, which is consistent with the assumption that the compressive strength is proportional to the critical compression stress of the cell walls. (Author)