A SHEAR GAGE DEVICE FOR MEASURING OF THE SHEAR STRAIN IN THE CORE OF SANDWICH PANELS

摘要

The paper presents a device for measuring the shear strain in the core of a sandwich construction. The device, that has been invented, developed and patented by FMV, is based on the insertion of a stick through one of the skins into the core of the sandwich panel. The angel between the plane of the sandwich panel and the stick will change when the core of the sandwich panel is loaded in shear. The angel alteration is proportional to the shear strain in the core. The geometric angle is transduced to an electrical signal i.e. by the use of a position transducer. The device can be used for all types of core materials such as foam, honeycomb and balsa. The paper presents the device, test results, calibrations, and experiences from use in full scale shock tests and boat hull wave impact tests in marine environment.