Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 07, 2017 - October 09, 2017
Honeycomb sandwich panels constructed with thin surfaces and honeycomb cores have characteristics like light-weight, higher stiffness and shock absorbency etc. Therefor they are usually developed for large-scale structure applications in various industrial fields. There is no existed standard testing method suitable to evaluate the fatigue strength of thick adhesive bonded structures like honeycomb sandwich panels. Fatigue strengths of adhesive-bonded sandwich panels constructed with aluminum honeycomb cores and CFRP (Carbon Fiber Reinforced Plastics) laminate faces were interested in this study. Fatigue experiments on sample cantilever beams of such honeycomb sandwich panels were carried out to validate the experimental method by improving the configurations of specimens, testing fixtures and instruments etc. From experimental results, proportional relationship between bending deflection and measured maximum strain could be used to validate the proposed testing method. Inner deformation or breakage of honeycomb core are considered to be occurred due to repeated compressive loads caused by large bending deflections. The destruction phenomenon can be confirmed from the decreased loading cyclic numbers with increased bending deflections. Based on the improved testing method, influences of design parameters, such as specimen length and height, foil thickness and cell size of honeycomb cores, on the fatigue strength of adhesive-bonded sandwich panels will be investigated in further experimental study.
