低频内耗测量时标准滞弹性固体的内耗行为

INTERNAL FRICTION BEHAVIOR OF THE STANDARD ANELASTIC SOLIDS IN LOW FREQUENCY INTERNAL FRICTION MEASUREMENT

用三参量力学模型的恒应力和恒应变弛豫时间描述了标准滞弹性固体的内耗行为．在低频内耗测量时，振动系统的惯量不可避免地影响测量的内耗值，当材料的内耗较大和测量频率与振动系统的共振频率可以比较时，惯量对内耗测量的影响较大，这时惯量的影响不可忽略．

Abstract Internal friction behavior of the standard anelastic solid has been described by τ σ (the relaxation time at constant stress) and τ ε (the relaxation time at constant strain) of a three parameter mechanical model. The effect of the inertia member in a vibration system on the internal friction values measured is not avoidable in a forced vibration experiment. When the measured internal friction values of a material are larger and the measuring frequency and resonant frequency of the vibration system are comparable to each other, the effect of the inertia member of the vibration system cannot be neglected.