Nonpenetrating repeated impact effect to the damage behavior of prestressed glass/epoxy composite pipes

Abstract

Glass-reinforced plastic (GRP) composite pipes, the use of which has been increasing rapidly in many areas in recent years, may be exposed to the impact of different objects during assembly, operation, repair, and maintenance. Since composite materials are sensitive to impacts, it is vital to examine damage to the material. In this study, the repeated impact response of GRP composite pipes under internal hydrostatic pressure was investigated. In order to simulate different operating conditions on the GRP samples, a prestress was created by applying 4, 16, and 32 bar internal hydrostatic pressure. Then, the prestressed pipes were subjected to low velocity repeated impact tests. As a result of repeated impact tests at low velocity, changes in maximum displacement amount, maximum contact force, energy absorption capacity, and impact velocity were evaluated depending on the number of impacts applied to the samples. The changes in the strength of the samples subjected to repeated impact tests at different internal pressure levels were determined by the hoop tensile tests performed according to the ASTM D2290 standard. As a result of the hoop tensile tests, the variation of the material's tangential tensile strength and damage behavior according to impacts' number and the prestress were investigated.

Energy absorption characteristics of E-glass/epoxy over-wrapped aluminum pipes with induced holes: an experimental research

“…Also, if PCs are appropriately designed, they could gradually crash and delaminate to dissipate the impact energy [14][15][16][17] . PCs are characterized by their excellent specific stiffness and strength, outstanding energy absorbing capacity, non-conductivity, good corrosion resistance, and high thermal insulation [18][19][20][21] .The advantages of increased specific strength and stiffness of FRP as well as the toughness of the metals can be combined to create hybrid structures out of metals and fiber reinforced polymers (FRP) 22 . Therefore, it is possible to create very desirable energy-absorbing structures by using the right amount of metallic components in combination with FRP composites 23 .…”

“…Also, if PCs are appropriately designed, they could gradually crash and delaminate to dissipate the impact energy [14][15][16][17] . PCs are characterized by their excellent specific stiffness and strength, outstanding energy absorbing capacity, non-conductivity, good corrosion resistance, and high thermal insulation [18][19][20][21] .…”

The effect of alternating the sequence of variable‐energy repeated impact on the residual strength and damage evolution of composite laminates

“…The repeated LVI has been also addressed in the literature. [13][14][15][16][17][18] For example, Liao et al 13 studied the damage accumulation in laminated composites under the constant-energy repeated LVI at the same position. They used force-time and force-displacement curves, the delamination area detected by the ultrasonic C-scan, and the absorbed energy to trace the damage evolution after each impact.…”

Low‐velocity impact response of halloysite nanotube reinforced glass/epoxy multi‐scale composite. Part 1: Dynamic loading performance

“…Impact loadings are the most crucial ones among these loadings for composite laminates. [3][4][5][6] Moreover, the most common reason for in-service failure is impact damage that propagates unnoticed and negatively affects the structural strength. [1,7] Impact damage will continue to be a decreasing problem for fiber-reinforced polymer matrix composites in the future.…”