2018 年 3 巻 p. 157-160
This paper provides an analysis of transducer creep by quantifying the individual creep contributions of the counterforce; strain gage backing and adhesive; and strain gage resistive metal foil. The analysis utilizes 14 plane-strain finite element models of a 30-kg aluminum bending beam load cell instrumented with strain gages made with Cu-Ni (constantan) and Ni-Cr (modified Karma) resistive metal foil and with end loop lengths varying from 0.09 to 0.30 mm. Physical measurement of transducer creep is also performed using dead-weight load application of aluminum bending beam load cells corresponding to the finite element models. This paper demonstrates good correlation between finite element analysis and dead-weight creep test results: minimum transducer creep of -22 and -30 μV/V is achieved for strain gages made of Ni-Cr and Cu-Ni resistive metal foil with end loop lengths of 0.18 and 0.20 mm, respectively. These results are consistent with the analysis in that the relative lengths of the end loops for the two resistive metal foils correspond with their relative creep contributions.
