Effect of non-penetrating impact damages of pre-stressed GRP tubes at low velocities on the burst strength

Burst strength and impact behaviour of hydrothermally aged glass fibre/epoxy composite pipes

“…In addition, the pipe specimen impacted with the energy level of 5 J consistently showed higher burst pressure than those impacted with energy levels of 7.5 J and 10 J. The same reduction in burst strength on impacted pipes were also reported by some authors [17][18][19]22,24]. Fig.…”

“…15a, matrix cracking was observed to occur on the internal surface of the specimen owing to the impact and internal pressure. Pressurised water penetrated on account of coalescences of the matrix cracks, creating a pathway through the pipe wall thickness and causing weepage failure [24]. The same failure mechanisms were observed for all ageing conditions.…”

“…The same procedure of low velocity impact tests and monotonic burst tests on 55° filament wound GRP tubes was performed by Kara et al [24]. However the researchers applied the tubes with 32 bars internal pressure during the low velocity impact tests.…”

“…13 shows the relationship between the burst strength and the ageing time for all impacted pipe specimens. In the monotonic burst tests, three damage modes were observed: whitening, weepage and eruption [24]. The whitening stage was observed in the filament winding direction during early monotonic burst test, indicating the progressive evolution of damage in the matrix cracks and debonding of the fibre-matrix [18].…”

Impact Analysis of Carbon/Glass/Epoxy Hybrid Composite Pipes

“…MesutUyaner, Memduh Kara and AykutS_ahin [11] burst strength and fatigue life of the impacted and nonimpacted specimens of E-glass/epoxy fibre composite tubes. Memduh Kara, MesutUyaner, AhmetAvci, and AhmetAkdemir [12] made study on studied the effect of low velocity impact on pre stressed e-glass fibre composite tubes and the changes in diameter due to internal pressure were observed. Lokman GEMİ, Memduh KARA and Ahmet AVCI [13] foundhybrid composite pipes with various internal pressure were subjected to impact test and burst strength of the impacted specimens.M.…”