Darbeli yüklemeye maruz kompozit borularda deniz suyunun etkisi

The aim of this experimental study was to investigate the sea water effect on fatigue behavior of composite pipes subjected to impact loads.In this study, firstly, the general data about burst strength (load capacity) and average life cycle of fatigue composite pipes are given. Manufacturing of vessels by filament winding method is expressed. Schematic of a filament-winding process is demonstrated and also materials of filament winding and applications of filament wound products are given. Information and procedure about impact and fatigue tests are given.Secondly, impact tests and fatigue test results are presented. The impact tests are performed at three different energy levels as 5J, 7.5J, and 10J at room temperature. The impact characteristics such as peak force, maximum deflection and total absorbed energy are listed. The mentioned impact characteristics of both conditions (dry condition and sea water immersion) are plotted against the impact energies. Using of load-deflection and load-time curves the impact properties of filament wound-glass fiber reinforced plastic (FW-GFRP) pipes are discussed for both conditions. Fatigue life cycles of FW-GFRP pipes and graphs of cycle to failure for all test specimens are given. Damage mechanisms (modes) of composite pipes are examined in detail.The results obtained are evaluated and discussed by using some graphics and images. Remarkable finding is observed that impact and burst strength values of composite pipes which are exposed sea water (three months) are increased a bit.