Abstract: Honeycomb sandwich structure is made of honeycomb core with specific geometry bonded to upper and lower skin. The accuracy of honeycomb core surface form also determines the strength and performance of the whole sandwich structure. The measurement and evaluation of the surface form accuracy of the machined honeycomb core is the important foundation to ensure the machining accuracy, but there is still short of ideal measurement and evaluation method. Honeycomb core is a kind of discontinuous and thin-walled structure, and it is difficult to locate on the thin walls when measuring the surface form accuracy by contact method. In non-contact measurement, the scale of wall thickness makes it difficult for conventional measurement methods to meet the accuracy requirements. In view of the research needs of honeycomb core surface form accuracy evaluation technologies, the current research statuses of contact and non-contact surface form measurement technologies of honeycomb core are reviewed. The measurement principle, key technologies and current progress of each method are introduced in detail. The development trend of surface form measurement technologies of honeycomb core in the future is forecasted.

Key words: honeycomb materials, measurement of honeycombs, machining accuracy evaluation, honeycomb surface form accuracy, measurement of discontinuous surface form