The Influence of Annealing Heat Treatment on the Vibrational Properties of the cu-zn Alloy Cylindrical Sample

The aim of the present work is to study the effect of annealing heat-treatment on the vibrational properties. Material used in this research was Cu-۳۰%Zn (leadfree) brass alloy and oscillating frequencies and damping ratios were measured experimentally by modal analysis equipment. Clamp-Free condition was simulated during the tests done for two points of each billet. Frequency response function (FRF) for samples under two different condition; (a) as-machined and (b) annealed at ۵۰۰°C for ۱۸۰ min were plotted and natural frequencies and damping ratios were identified. Results show notable increasing in magnitude of the natura frequencies, ۱۲.۵% in first, ۶.۳% in second and ۷.۴% in third frequency. Moreover, ۲۹.۳%, ۴۷.۷۳% and ۴۴.۴% increasing in damping ratios were achieved respectively. These results lead to the better damping of the vibration in the parts which can be very useful and applicable in various applications such as automotive and civil industries.

Keywords:

vibration , natural frequencies , modal analysis , annealing , damping ratio