Numerical simulation of magnetic flux and force in electromagnetic forming with attractive force

2007 ◽  
Vol 184 (1-3) ◽  
pp. 190-194 ◽  
Author(s):  
Jianghua Deng ◽  
Chunfeng Li ◽  
Zhiheng Zhao ◽  
Fang Tu ◽  
Haiping Yu
Keyword(s):  
Numerical Simulation ◽  
Magnetic Flux ◽  
Electromagnetic Forming ◽  
Attractive Force

scholarly journals Numerical Simulation of the Explosive Events in the Solar Atmosphere

1993 ◽  
Vol 141 ◽  
pp. 134-137
Author(s):  
Shu-Ping Jiu
Keyword(s):  
Numerical Simulation ◽  
Magnetic Flux ◽  
Magnetic Reconnection ◽  
Solar Atmosphere ◽  
Plasma Flow ◽  
Small Scale ◽  
Flare Activity ◽  
Specific Location ◽  
Mhd Simulations ◽  
Explosive Events

AbstractExplosive events are the earliest indicators of flare activity and potentially predict the imminent occurrence of a flare at a specific location. They are highly energetic small-scale phenomena which are frequently detected throughout the quiet and active sun. The observations show that explosive events are related to emerging magnetic flux and tend to occur on the edges of high photospheric magnentic field regions. The cancellation of photospheric magnetic flux are the manifestation of explosive events, so that they are identified as the magnetic reconnection of flux elements. We assume that emerging flux are convected to the network boundaries with the typical velocity of intranetwork elements. Two-dimension (2D) compressible MHD simulations are performed to explore the reconnection process between emerging intranework flux and network field. The numerical results clearly show the cancellation of magnetic flux and the acceleration of the plasma flow.

Study of Double-Sided Welding Defect Detection Technique Based on the Method of Magnetic Flux Leakage

2013 ◽  
Vol 694-697 ◽  
pp. 1173-1178
Author(s):  
Guan Ga Dai ◽  
Wei Cui ◽  
Xue Zeng Wang
Keyword(s):  
Numerical Simulation ◽  
Magnetic Flux ◽  
Weld Line ◽  
Suggested Method ◽  
Magnetic Flux Leakage ◽  
Space Distribution ◽  
Magnetization Direction ◽  
Butt Weld ◽  
Scanning Method ◽  
Flux Leakage

This paper presents a new approach based on the method of magnetic flux leakage (MFL) for the double-sided butt weld (DSBW) of the welding equipment such as the pressure vessel in order to detect and identify the weld defect. In this approach, a new magnetization structure is adopted whose magnetization direction is perpendicular to weld line, also, a new continuous non-contact scanning method is used, what aims to solve the problems about complex leakage magnetic field (LMF) space distribution. Then, the LMF distribution laws with non-defect (ND) and laws with precrack from heat affected zone (PFHAZ) are obtained through using these methods such as theoretical analysis, numerical simulation, and experimental study. Afterwards, this paper reviews the recognition analysis of the above-mentioned two kinds of state (ND and PFHAZ) by binding the contrastive curves. The outcomes indicate that the suggested method of MFL has realized the recognition of ND and PFHAZ; The numerical simulation results and experimental results match each other well and their correlation coefficient R is 0.9729. Furthermore, the results verify the feasibility and the validity for the suggested method. This is a new way for exploration detection of the double-sided butt weld.

Numerical Simulation and Experimental Research on Crack Magnetic Flux Leakage Field

2011 ◽  
Author(s):  
Fujun Liu ◽  
Mulin Zheng ◽  
Shuai Kong ◽  
Zhangwei Ling ◽  
Yueqiang Qian
Keyword(s):  
Numerical Simulation ◽  
Magnetic Flux ◽  
Experimental Research ◽  
Inclination Angle ◽  
Three Dimensional ◽  
Magnetic Flux Leakage ◽  
Experimental Investigations ◽  
Leakage Field ◽  
Three Dimensional Models ◽  
Flux Leakage

Magnetic flux leakage (MFL) testing is widely used to inspect and characterize defects in pipelines, storage tanks and other structures. In this paper, based on the Maxwell Equations, numerical simulation and experimental research of crack magnetic flux leakage field were carried out. The three-dimensional models of cracks were established, the influence of the generalized crack parameters to the magnetostatic MFL field, including depth, width, inclination angle and crack spacing, was discussed. The relationship between defect parameters and MFL amplitude was obtained. The amplitude is significantly affected by the inclination angle. Therefore, single direction inspection may lead to undetected in practice. While the two cracks interval is less than 5 mm, the MFL fields would overlap. Furthermore, the experimental investigations were developed, and the results agree well with that of the simulation. The conclusions could provide valuable reference for inspection.

Sign in / Sign up

Export Citation Format

Share Document