The Eddy Current Method of Alloy Drill Pipes Wall Thickness Evaluation: Impact Analysis

2019 ◽  
Vol 970 ◽  
pp. 336-342
Author(s):  
Aleksandr E. Goldshtein ◽  
Vasily Y. Belyankov
Keyword(s):  
Wall Thickness ◽  
Eddy Current ◽  
Impact Analysis ◽  
Pipe Wall ◽  
Current Method ◽  
Eddy Current Method ◽  
Pipe Surface ◽  
Thickness Change ◽  
Pipe Wall Thickness ◽  
Aluminum Pipe

The dependences of the surface eddy current probe added voltage at the interaction of the probe magnetic field with an aluminum pipe from the following main interference factors are determined: the pipe wall thickness, the gap between the probe and the surface of the pipe, the electrical conductivity of the material, the curvature of the pipe wall, the presence of areas with a smooth thickness change of the wedge character and a local spherical thinning, axis misalignment with respect to the pipe surface, the lateral misalignment of the probe axis. The problem is solved with the help of the finite element method (FEM). These data are consistent with the experimental results.

Influence of the Structural Performance of Steel Tubular Scaffold Based on Measured Imperfection

2012 ◽  
Vol 256-259 ◽  
pp. 754-757 ◽  
Author(s):  
Hong Gao ◽  
Wu Gao ◽  
Chun Xiao Li ◽  
Xiao Xia Huo
Keyword(s):  
Wall Thickness ◽  
Carrying Capacity ◽  
Random Sampling ◽  
Impact Analysis ◽  
Pipe Wall ◽  
Pipe Wall Thickness ◽  
Control Rod ◽  
Tubular Scaffold ◽  
The Impact ◽  
Modal Method

In order to study the impact of the measured defects on the structure and properties of steel tubular scaffold, the stochastic finite element theory is used to study the different effects of different defect structure.To accord to the random sampling method, Nine five projects under construction fasteners scaffolding works pipe is measured.In the the live 6m and 3m φ48 × 3.5 specifications 748 pipe wall thickness, diameter, initial bending raw data is random sampling tests. Article establish a structure commonly used rod defects random distribution of pipe wall thickness, diameter and initial bending deviation and the parametric statistical information,through the use of the probability statistical theory and methods,excluding abnormal data. The article explores and studies fasteners scaffolding structure in different fastener tightening torque (30N • m, 40N • m, 50N • m), ideal initial geometric imperfections 3L/1000, and the measured rod defects and defectof the structure carrying capacity and impact analysis, by means of analysis software, the use of the consistent defects modal method and random defects modal method. The results of the analysis show that the pole bending defects affect the carrying capacity of steel scaffolding structure defects . Measured defects affect the steel scaffolding structure, leading to serious security risks. It is necessary to strengthen the control rod defects. The results provide reliable information for the design and construction units.

Experimental Characterization of Flow Induced Vibration in Fully Developed Turbulent Pipe Flow

2009 ◽  
Author(s):  
Andrew S. Thompson ◽  
Daniel Maynes ◽  
Thomas Shurtz ◽  
Jonathan D. Blotter
Keyword(s):  
Wall Thickness ◽  
Pipe Wall ◽  
Wall Pressure ◽  
Surface Velocity ◽  
Pipe Diameter ◽  
Pipe Material ◽  
Pipe Surface ◽  
Pipe Wall Thickness ◽  
Wall Pressure Fluctuations ◽  
Pipe Vibration

In this paper we present results of an experimental investigation that characterizes the wall vibration of a pipe with a fully-developed turbulent flow passing through it. Experiments were conducted in a water flow loop where the influences of average fluid speed, pipe diameter, pipe wall thickness, and pipe material on the overall pipe vibration were investigated. The pipe vibration was characterized by accelerometer instruments mounted on the surface of the pipe at multiple locations and the rms of the pipe wall acceleration, velocity, and displacement were measured. Simultaneous measurements of the local temporal fluctuations in the wall pressure were also obtained. Specifically, experiments were conducted in test sections of internal diameters of 3.81 cm – 10.16 cm, pipe wall thickness to diameter ratio ranging from 0.06 – 0.10, and with PVC, aluminum, and stainless steel pipe materials. The experiments were conducted with average fluid speeds ranging from 0 – 11.5 m/s with an accompanying range in the dynamic pressure from 0 – 1 atm. The results show that the rms of the acceleration is proportional to the average fluid speed raised to the 2.12 power. Also, the rms of the pipe surface velocity and the pipe displacement scale with the average fluid speed to the 1.62 and 1.16 powers respectively. Further, the rms of the pipe acceleration and pipe speed increase with increasing pipe diameter, while the pipe modulus of elasticity appears to exert negligible influence on the magnitude of the measured vibrations. The rms of the wall pressure fluctuations scale with the fluid speed raised to the 2.0 power.

Development of a mathematical model of the influence of wall thickness on the strain rate when profiling pipes by drawing

2020 ◽  
pp. 49-52
Author(s):  
R.A. Okulov ◽  
N.V. Semenova
Keyword(s):  
Mathematical Model ◽  
Strain Rate ◽  
Wall Thickness ◽  
Pipe Wall ◽  
Strain Intensity ◽  
Thickness Strain ◽  
Pipe Wall Thickness

The change in the intensity of the deformation of the pipe wall during profiling by drawing was studied. The dependence of the strain intensity on the wall thickness of the workpiece is obtained to predict the processing results in the production of shaped pipes with desired properties. Keywords drawing, profile pipe, wall thickness, strain rate. [email protected]

Detection of fiber waviness in carbon fiber prepreg using Eddy current method

2021 ◽  
pp. 100981
Author(s):  
Yanfei Liao ◽  
Jingjing Wang ◽  
Zhiwei Zeng ◽  
Junming Lin ◽  
Yonghong Dai
Keyword(s):  
Carbon Fiber ◽  
Eddy Current ◽  
Current Method ◽  
Eddy Current Method ◽  
Fiber Waviness
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