A Strain Measurement of Acoustically Excited Aircraft Structures at Elevated Temperatures

Abstract

A high temperature strain gage which can be adhered in reverse is developed for attaining accurate strain measurement of acoustically excited structures at elevated temperatures. The reversible gage is a self-temperature compensated, polyimide base, foil one usable upto 250°C. The given environment is so hostile that main effort is devoted to limite the error of the measurement under 50×10-6 upto 250°C. Then, the creep and drift of the reversible gages are tested for applying them to aircraft flop model tests. The fatigue of reversible gages are checked after the test by measureing their resistances, gage-factors and dynamic responces. Consequently, it is clarified that the reversible strain gage is a good tool to obtain accurate high temperature strain data, and it is thought to keep its performances under the hostile environment without considerable deterioration.