When the honeycomb core sandwich panel (hereafter, HSP for brevity) is used as a floor panel, a dent is formed on the surface of it. If the depth of dent was deeper, it is changed into a new one. In order to change it efficiently, it is necessary to study a period for use as the floor panel applied the repetition of local compression load for the longitudinal direction of honeycomb core (hereafter, fatigue life for brevity). In this study, the local compression fatigue tests of peripherally clamped HSPs with different core height and different face sheet thickness were carried out by changing an applied load. A growth of dent in the direction of depth was measured during the test. From the obtained results, the follows were summarized; 1) In the growth curve of dent depth, there was a steady state region where the dent depth grew proportionally for the load repetition. 2) The stress state of face sheet on a contact surface with an indenter (hereafter, upper face sheet for brevity) governed the fatigue life of HSP as the floor panel. 3) There was no effect of core height and thickness of another face sheet on the fatigue life. 4) The fracture pattern changed from a tensile type to a shearing type when the thickness of upper face sheet was thick or the applied load was low.
