scholarly journals Advances in electromagnetic models for three-dimensional nondestructive evaluation of advanced composites

2016 ◽  
Author(s):  
Harold A. Sabbagh ◽  
R. Kim Murphy ◽  
Elias H. Sabbagh
Keyword(s):  
Nondestructive Evaluation ◽  
Three Dimensional ◽  
Advanced Composites ◽  
Electromagnetic Models

scholarly journals IS IT PHYSICALLY SOUND TO ADD A TOPOLOGICALLY MASSIVE TERM TO THREE-DIMENSIONAL MASSIVE ELECTROMAGNETIC OR GRAVITATIONAL MODELS?

2006 ◽  
Vol 21 (03) ◽  
pp. 559-573 ◽  
Author(s):  
ANTONIO ACCIOLY ◽  
MARCO DIAS
Keyword(s):  
Three Dimensional ◽  
Effective Field ◽  
The Novel ◽  
Electromagnetic System ◽  
Gauge Invariant ◽  
Electromagnetic Models ◽  
Massive Models

The addition of a topologically massive term to an admittedly nonunitary three-dimensional massive model, be it an electromagnetic system or a gravitational one, does not cure its nonunitarity. What about the enlargement of avowedly unitary massive models by way of a topologically massive term? The electromagnetic models remain unitary after the topological augmentation but, surprisingly enough, the gravitational ones have their unitarity spoiled. Here we analyze these issues and present the explanation why unitary massive gravitational models, unlike unitary massive electromagnetic ones, cannot coexist from the viewpoint of unitarity with topologically massive terms. We also discuss the novel features of the three-term effective field models that are gauge-invariant.

Improving induction tube welding system performance using soft magnetic composites

2019 ◽  
Vol 39 (1) ◽  
pp. 185-191
Author(s):  
Sean Michael Muyskens ◽  
Tareq Ibrahim Eddir ◽  
Robert Charles Goldstein
Keyword(s):  
Three Dimensional ◽  
Three Dimensions ◽  
Process Efficiency ◽  
Magnetic Composite ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Content Type ◽  
Tube Welding ◽  
Electromagnetic Models ◽  
Welding System

Purpose This paper aims to demonstrate the benefits of using different impeder materials for induction tube welding systems. Design/methodology/approach To show the difference in using various impeder materials, a new approach was taken to model tube welding systems in two and three dimensions. Three-dimensional (3-D) electromagnetic models were used to determine the current distribution along the weld vee as well as the permeability of the tube along the length of the welding system. Two-dimensional (2-D) coupled electromagnetic plus thermal models with rotational movement were used to determine the temperature distribution in the heat-affected zone. Findings Simulation results suggest upwards of 25 per cent system power savings when using a soft magnetic composite (SMC) impeder rather than the traditional ferrites. Research limitations/implications There is currently a lack of experimental data to validate the models, but future work will include comparison of models to real-world trials. Practical implications When dealing with tube welding systems, there are possibilities to improve process efficiency or increase production quality and output by improving the impeder material. Originality/value While simulations of tube welding systems have been done previously, studies on improving impeder materials are rarely carried out. This paper brings to light possible improvements to be made to induction tube welding systems.

Development of an Optical Heterogeneity Evaluation System Using Phase-Shift Digital Holography

2012 ◽  
Vol 523-524 ◽  
pp. 865-870
Author(s):  
Terutake Hayashi ◽  
Masaki Michihata ◽  
Yasuhiro Takaya
Keyword(s):  
Phase Shift ◽  
Nondestructive Evaluation ◽  
High Precision ◽  
Evaluation System ◽  
Digital Holography ◽  
Optical Glass ◽  
Three Dimensional ◽  
Optical Path ◽  
Nanometer Scale ◽  
Optical Components

The nondestructive, non-contact, three-dimensional evaluation of optical glass has been important to the manufacturing of high-precision optical components. In order to achieve high-precision nondestructive evaluation of optical heterogeneity, we develop a versatile evaluation system using the parallel phase- shift digital holography, which enables measurements of the optical path differences at a nanometer-scale resolution. The amplitude and phase distributions of the object wave can be reconstructed directly from a single hologram by using the parallel phase-shift digital holography system. The optical heterogeneity of a sample is determined quantitatively based on the distribution of the optical path differences quantitatively.

scholarly journals High-speed terahertz reflection three-dimensional imaging for nondestructive evaluation

2012 ◽  
Vol 20 (23) ◽  
pp. 25432 ◽  
Author(s):  
Kyong Hwan Jin ◽  
Young-Gil Kim ◽  
Seung Hyun Cho ◽  
Jong Chul Ye ◽  
Dae-Su Yee
Keyword(s):  
Nondestructive Evaluation ◽  
High Speed ◽  
Three Dimensional ◽  
Three Dimensional Imaging
Sign in / Sign up

Export Citation Format

Share Document