tube hydroforming (thf) process is used to produce the complex components from the initial cylindrical tubes. in this paper, t- shape component was formed using a tube hydroforming machine and the residual stresses of hydroformed tube was determined by hole drilling method. subsequently, the thickness distribution and residual stresses of final tube were investigated using experimental and fini...

Real part of the transverse and longitudinal impedance of a pipe with slowly varying radius is calculated based on the energy radiated by the beam in the transition region. Submitted for publication _________ Work supported by Department of Energy contract DE-AC03-76SF00515

This paper reports the performance characteristics of a-Si detectors with Ir-192 gamma source. Imaging performance of the detector system is evaluated using contrast sensitivity over a range of material thickness of steel, signal to noise ratio, dynamic range and linearity. The radiographic sensitivity was observed over a range of thickness of steel using standard image quality indicators. Quan...

Pipe-in-pipe structure are widely used in offshore oil and gas transportation. The is subjected to various dynamic loads such as earthquakes vortex-induced vibrations during service, of which transverse impact the main cause damage. At present, whole process analysis parameter pipe-in-pipe under action not systematic complete. Based on explicit software LS-DYNA, finite element model was establi...

Abstract Advanced research into non-destructive control of industrial pipeworks provides several acoustical methods for inspection of their structural integrity. Applying guided waves is one possible solution to detect and identify different flaws. Many studies have shown the importance of complex waves describing the interaction phenomena at the vicinity of the defects, modeled as geometrical ...

The use of pipe flange connections is standardized in the codes of JIS, ASME, DIN and so on. However, these codes are almost entirely dependent on experience, and subsequently some problems concerning pipe flange connections have been encountered. In the present paper, the distribution of contact stresses which governs the sealing performance is analyzed as a three-body contact problem, using a...

Reshaping process is a widely used method for producing tubes with non-circular cross sections. Owing to the friction between pipe and rolls, initial round pipe moves forward and consequently, it gradually formed into square or rectangular one. In practice, geometric profile of the rolls will be changed after a while. These changes would be detrimental the production of faultless products. Ther...

Pull-out fracture of lag-screw bolt is brittle and has a large dispersion in strength. therefore, the bucking pipe preceding pull-out controls strength toughness joint. The sandwiched between bolts fixed to base plate. method little dispersion, can be controlled by adjusting thickness length effect was confirmed experiments. it also that once maximum load reached, restored exchanging pipe.