Frequency response function method for evaluation of thermal striping phenomena

kasahara, Naoto

A rational analysis method of thermal stress induced by fluid temperature fluctuation is developed, by utilizing frequency response characteristics of structures. High frequency components of temperature fluctuation are attenuated in the transfer process from fluids to structures. Low frequency components hardly induce thermal stress since temperature homogenization in structures. Based on investigations of frequency response mechanism of structures to fluid temperature, a frequency response function of structures was derived, which can predict stress amplitudes on structural surfaces from fluid temperature amplitudes and frequencies. This function is formulated by separation of variables, and is composed of an effective heat transfer function and an effective thermal stress one. The frequency response function method appears to evaluate thermal stress rationally and to give information on damageable frequency range of structures.