Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : December 02, 2021 - December 03, 2021
In this paper, we propose an equivalent viscoelastic model for non-destructive inspection of water main. First, a static loading test is performed using the buried pipe to obtain the restoring force characteristics. Second, the step response test is conducted by the step loading. Furthermore, the damping coefficient is estimated using the transient response. As a result, when the ratio of water content was 30%, the soft spring characteristics was observed, and when the ratio of water content was 40%, the hard spring characteristics was observed. The relaxation behavior is observed in the restoring force characteristic. Moreover, the linear spring constant was obtained as the 22.31×106[N/m] in case of water content 40%, the linear spring constant was obtained as the 8.49×106[N/m] in case of water content 30%, respectively. In addition, the curve fitting analysis is performed using the transient response. As the result, the relaxation behavior were good agreement with the exponential relaxation model and Prandtl-Eyring model.
