An approximate model for three-dimensional alternating current potential drop analyses using a commercial finite element code

2010 ◽  
Vol 43 (2) ◽  
pp. 134-140 ◽  
Author(s):  
Giuseppe Sposito ◽  
Peter Cawley ◽  
Peter B. Nagy
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Potential Drop ◽  
Alternating Current ◽  
Approximate Model ◽  
Finite Element Code ◽  
Current Potential

scholarly journals Measuring the depth of surface cracks using alternating current potential drop technique, with suppression of the influence of the electromagnetic properties of the metal

2021 ◽  
Vol 2091 (1) ◽  
pp. 012047
Author(s):  
P N Shkatov
Keyword(s):  
Crack Depth ◽  
Potential Drop ◽  
Alternating Current ◽  
Measurement Range ◽  
Electromagnetic Properties ◽  
Surface Cracks ◽  
Measuring Techniques ◽  
Drop Technique ◽  
Current Potential

Abstract Traditional measuring techniques often lead to errors due to the need to register signals in both defective and defect-free areas. In this paper, we introduce an alternating current potential drop technique with detuning from the influence of variations in the electromagnetic properties of the metal achieved by registering a signal only at the defective site. We show that, with an appropriate choice of measurement parameters, the use of the proposed technique leads to an increase in sensitivity to the crack depth as well as to an increase in the measurement range.

Three-Dimensional Finite Element Simulation of Electro and Stress Migration Effects in Interconnect Lines

1997 ◽  
Vol 473 ◽  
Author(s):  
Sven Rzepka ◽  
Matt A. Korhonen ◽  
Eicke R. Weber ◽  
Che-Yu Li
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Grain Structure ◽  
Finite Element Code ◽  
Fem Simulations ◽  
Line Segments ◽  
Element Simulation ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Interconnect Lines

ABSTRACTA tool for 3-D modeling of EM and SM in interconnect lines has been developed based on a commercial finite element code. After detailing the approach, we focus on the verification of the simulator by comparing the results of 1-D analytic and FEM simulations, and then we apply the simulator to interconnect line segments with a specified grain structure.

Finite-Element Analysis of Fatigue Lifetime in Pavements

2000 ◽  
Vol 1709 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Jeffrey W. Simons ◽  
Lynn Seaman
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Asphalt Pavement ◽  
Three Dimensional ◽  
Load Cycle ◽  
Repeated Loading ◽  
Finite Element Code ◽  
Element Analysis ◽  
Bending Fatigue ◽  
Dimensional Finite Element

A computational model was developed to predict fatigue life of pavements under repeated loading and implemented into the three-dimensional finite-element code DYNA3D and the two-dimensional finite-element code NIKE2D. The model simulates the cracking response of flexible or rigid pavements under fatigue. An equation for fatigue crack growth was developed, which grows cracks under single cycles of loading at stresses well below yield. The cracks are incorporated into the material response and result in anisotropic behavior and decreased stiffness for cracked pavements. A procedure for estimating fatigue lifetimes by performing a limited series of calculations was developed. For each calculation, crack growth rate for a single loading cycle is calculated, crack extension is extrapolated to many cycles, and the cracking in the pavement is updated. The next cycle is calculated for the damaged pavement. The procedure is repeated until full damage is reached. Well-controlled laboratory bending fatigue test results generated at the University of California at Berkeley (UCB) for asphalt pavement were used to verify that the model assumptions are appropriate for modeling fatigue damage growth in asphalt pavement. The UCB bending fatigue tests were simulated using the repeat loading algorithm in DYNA3D. Calculations of crack growth for a given load cycle were compared in the NIKE2D and DYNA3D implementations.

Modelling glacial till under triaxial conditions using a BRICK soil model

2000 ◽  
Vol 37 (5) ◽  
pp. 1078-1088 ◽  
Author(s):  
Barry M Lehane ◽  
Brian Simpson
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Glacial Till ◽  
Ground Movement ◽  
Laboratory Research ◽  
Finite Element Code ◽  
Soil Model ◽  
Dimensional Version ◽  
Recent Laboratory

The paper presents some findings from recent laboratory research aimed at improving ground-movement predictions in a hard, heavily overconsolidated lodgement till. These findings are subsequently applied to a new three-dimensional version of the BRICK soil model to investigate the suitability of this model for the till. It is shown that BRICK captures the essential features of the material's behaviour under triaxial conditions and is capable, when incorporated in a finite element code, of providing realistic predictions for the settlement of shallow foundations.Key words: glacial till, stiffness, strength, BRICK model, footing settlement.

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