the theoretical and experimental investigation on the thermo-mechanical properties of carbon nanotube (cnt) as reinforcer for oil and gas pipes has increasingly become a hot research area for many engineers and material scientists in recent years. this is mainly due to the advent of the new composite material systems that exhibit exotic material and mechanical properties as compared to the trad...

The development of mathematical models for describing the dynamic behaviours of fluid conveying pipes, micro-pipes and nanotubes under the influence of some thermo-mechanical parameters results into nonlinear equations that are very difficult to solve analytically. In cases where the exact analytical solutions are presented either in implicit or explicit forms, high skills and rigorous mathemat...

The present work investigates the effect of the elliptical three-dimensional (3D) cracks on a pipe with thickness transition, considering internal pressure. Level sets were defined using the extended finite element method (XFEM), the stress intensity factors (SIFs) of 3D cracks were investigated and compared between straight pipes and pipes with thickness transition. The results show that the X...

This study compared the variation of dynamic elastic modulus (E) three types composite pipes made by filament winding process and a steel alloy specimen, according to signal source changes. The specimens were produced with different angles, i.e., ±50°, ±52.5°, ±55°. moduli obtained through known angular variation, two sensors positioned over specimen's surface. In previous article, in velocity ...

Ensuring the stability of shaft structure is one key technologies for application raise boring method. In process reaming through rock formations with water disintegration characteristics, impact gushing and drenching may induce partial collapse. To solve this problem, an intelligent temporary while-boring support technology proposed in paper. Firstly, main characteristics are introduced. Utili...

This paper presents the architecture used to develop a micro-robot for narrow pipes inspection. Both the electromechanical design and the control scheme will be described. In pipe environments it is very useful to have a method to retrieve information of the state of the inside part of the pipes in order to detect damages, breaks and holes. Due to the different types of pipes that exists, a mod...