Laser tube bending is a flexible forming process. Two irradiation methods of axial and circumferential scanning are generally used to form metal tubes. The two most important disadvantages of circumferential scanning are its lower bending angle and the time interval required between each scan for cooling purpose. In this research, a novel cooling strategy during laser tube bending with circumfe...

A simplified methodology is proposed for calculating the plastic collapse (limit) bending moment load of a pipe with circumferential flaw an emphasis on its application use in assessment cracked offshore wind turbine monopile using failure diagrams. The based theory net section (NSC) but differs from existing approaches that it does not need idealisation and categorisation crack before assessme...

In order to study the blasting effect and damage rock mass when cutting seam cartridge is eccentrically uncoupled. The ANSYS/LS-DYNA® nonlinear dynamic platform was used simulate of five eccentric uncoupled coefficients on cartridge, crack growth process under condition complete eccentricity simulated. By comparing analyzing stress measuring points in direction seam, vertical direction, circumf...

The aim of this work is to characterize the rolling and rolling-sliding contact fatigue failure mechanisms on 32CrMoV13 nitrided steel. During tests (RCF), two general features were observed: specimens presenting short lives rough sharpened spalling damage long only microspalling marks. It was possible determine a limit 3 GPa. (RSCF), clearly different behaviour between in has been driver shows...

the prevalent method of irrigation in paddy fields in iran is continuous ponding, which changes to intermittent method at the time of water shortage. soil cracks are the main problem in intermittent irrigation. in this study, effects of adding rice straw on some soil physical characteristics and cracks were studied in paddy soils of the guilan province of iran. the experiment was performed as s...

The deformation and failure of underground engineering are usually caused by unloading. In this work, triaxial unloading confining pressure tests carried out to simulate the process rock mass unloading, analyze crack-characteristic stress, study energy evolution under pre-peak post-peak characteristics combined with theory. results show that, when increases from 5 MPa 20 MPa, crack closure stre...

Eddy current testing (ECT) is a conventional inspection method of heat exchanger tubes. Many types of probes have been developed depending on such tube conditions as tube shapes and materials. However, the vicinity of a tube expansion is still a difficult area to inspect. This is because there is a step-shape variation circumferentially on the inside surface and there is a ferromagnetic tube sh...