Akademik Veri Yönetim Sistemi
KGK-KAUTSCHUK GUMMI KUNSTSTOFFE, cilt.63, ss.291-295, 2010 (SCI-Expanded)
In this study, fracture of high impact resistive polystyrene materials when they are exposed to repeated impacts with different amount of energies, and the changes of force and energy through the crack initiation and crack propagation were analyzed. As the continuation of our previous work, the present work still concentrated on the parameters crack initiation and crack propagation energy. Instrumented charpy impact tests were performed on a Ceast pendulum type tester (Resil 25). The material was initially subject to impact for once with hammer falling angle of 15 degrees (0.14 J) and then exposed to multiple impacts of 10 degrees (0.06 J) until it fractured. The same process was afterwards repeated with impacts of several 15 degrees falling angle impacts and with the impacts of 10 degrees until fracture. The number of the previous impacts made with the impacts of 15 degrees falling angle was 7 at most. By changing the number of previous impacts between 1 and 7, impact fatigue tests were performed with hammer falling angles of 10 degrees up to fracture.