Mechanical behavior of GRP pressure pipes with addition of quartz sand filler

Abstract

In comparison with steel, concrete, and polymeric pipes, glass-reinforced plastic (GRP) pressure pipes use more expensive raw materials. Thus, despite of their attractive structural performance, mainly in terms of mechanical strength combined with low weight, the higher cost can be a limitation in many applications. In this scenario, an alternative to reduce the final price of GRP pipes is the addition of quartz sand filler. In this experimental and numerical study, filament-wound E-glass/polyester pipes with nominal inside diameter of 300 mm and wall thickness of 5.7 mm were produced with the incorporation of quartz sand as filler and tested to failure under internal pressure. The mechanical behavior of the composite pipes was evaluated experimentally, throughout short-time hydraulic failure pressure tests, as well as using finite element analysis (FEA). In the FEA simulations, the shell wall was modeled as an axisymmetric layered orthotropic material. A good agreement, varying from 96% to 98%, was obtained between the average hydraulic failure pressure measured and FEA predicted failure pressures, using Tsai—Hill and Hoffman failure criteria, respectively.

Effect of Cellulose Nanocrystals and Hot Stretching on Shish–Kebab Structures of High-Density Polyethylene

“…In order to broaden the application scope of PE, researchers at home and abroad have carried out graft modification, cross-link modification, copolymer modification, plasma modification, chlorination modification on PE, and inorganic components and organic components in the PE matrix, and chemical modification methods such as chlorosulfonation modification. We then add other polymers for mixture modification and filling modification to improve mechanical properties, heat resistance, and aging resistance of PE materials. − The properties of co-PE conformal materials are difficult to maintain during use, and the recycling process is very complicated. Therefore, for PE, researchers are more concerned with self-reinforcing techniques that do not add other polymers: these include utilizing CAD/CAE technology, designing suitable special processing equipment, and supporting special molding methods to change the microstructure of the PE, control the crystal shape, and improve the PE performance.…”

Estimation of creep strain and creep failure of a glass reinforced plastic by semi-analytical methods and 3D numerical simulations

“…Glass reinforced plastic pipes may feature a complex structure, including chopped strand mat layers on the inner side and filament wound layers on the outer side [9,10,11]. Short-time hydraulic failure occurs on the inner diameter [10]. Ring deflection tests may be performed according to standard ISO 9967 to estimate the time-dependent strain of a pipe and study the long term creep failure [12,9].…”