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Saturday, August 8, 2020 | History

3 edition of A computational algorithm for crack determination, the multiple crack case found in the catalog.

A computational algorithm for crack determination, the multiple crack case

Kurt Bryan

A computational algorithm for crack determination, the multiple crack case

by Kurt Bryan

  • 113 Want to read
  • 28 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distribytor in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Inverse problems (Differential equations),
  • Cracking process.

  • Edition Notes

    StatementKurt Bryan, Michael Vogelius.
    SeriesICASE report -- no. 92-24., NASA contractor report -- 189665., NASA contractor report -- NASA CR-189665.
    ContributionsVogelius, M., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15367085M

    to verify the first and second step of the proposed algorithm, the algorithm was tested using real surface images of concrete bridge. Backpropagation neural network was trained using images of concrete structure, and the trained network was tested for new new images. The recognition rate of the crack image was 90% and non-crack image. Centrifugal compressors are a key piece of equipment for modern production. Among the components of the centrifugal compressor, the impeller is a pivotal part as it is used to transform kinetic energy into pressure energy. Blade crack condition monitoring and classification has been broadly investigated in the industrial and academic area. In this research, a pressure pulsation (PP) sensor.

    The strength of today's communications security is based on the complexity of our encryption algorithms. But the day is coming when cracking those algorithms may be computationally trivial. Deep Learning-Based Crack Damage Detection Using Convolutional Neural Networks Article (PDF Available) in Computer-Aided Civil and Infrastructure Engineering 32(5) March with.

    A new combination method of beam-type finite element multiwavelet-based algorithm and least square support vector regression (LSSVR) algorithm is proposed for detecting the location and size of a crack in a pipe. According to operators of engineering problems, Rayleigh-Euler and Rayleigh-Timoshenko beam-type multiwavelets are constructed using the stable completion in the multiresolution. MathematicalProblemsinEngineering 5 2 4 6 8 10 16 18 1 Crack spacing ratio (š›¾ s Single edge crack š›¾ c= š›¾ c = š›¾.


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A computational algorithm for crack determination, the multiple crack case by Kurt Bryan Download PDF EPUB FB2

Get this from a library. A computational algorithm for crack determination, the multiple crack case. [Kurt Bryan; M Vogelius; Langley Research Center.]. A computational algorithm to determine crack locations from electrostatic boundary measurements. The case of multiple cracks Author links open overlay panel Kurt Bryan Michael VogeliusCited by: A computational algorithm for crack determination: The multiple crack case.

By Michael Vogelius and Kurt Bryan. Abstract. An algorithm for recovering a collection of linear cracks in a homogeneous electrical conductor from boundary measurements of voltages induced by specified current fluxes is developed.

The technique is a variation of Newton Author: Michael Vogelius and Kurt Bryan. A computational algorithm for crack determination: The multiple crack case: NTRS Full-Text: View Document [PDF Size: MB]: Author and Affiliation:Cited by: 3.

In addition to a detailed account of its derivation we present computational results for this algorithm. INTRODUCTION In this paper we develop a very efficient computational algorithm to determine an internal linear crack from electrostatic measurements at the Cited by: Summary.

A computational scheme has been developed for the crack path prediction, which is performed by the step-by-step stress analysis ahead of the crack tip and the prediction of a curved icrement of the crack growth by the use of analytically expressed crack path in the neighbourhood of the crack.

In this section, the formulation of multiple-crack detection in Eulerā€“Bernoulli beams using natural frequencies is presented. Following, a crack detection algo-rithm is presented in order to solve the common restriction in the multiple-crack detection problems that is the identiļ¬cation of the actual number of cracks de-veloped in the beam.

The proposed algorithm diagnosis helps in finding the crack based on the extracted crack features. Methodologies [11] have a hybrid system to detect the crack with 96% accuracy.

In addition to the ultrasonic imaging system, ultrasonic sound can also be used to detect the surface crack with conceptual crack feature extraction.

In case of open crack, crack remains open during the entire cycle of vibration. While in breathing crack, crack remains open only during part of the cycle of vibration.

Most cracks, that either develops or propagates in a component in-service due to fatigue, creep, manufacturing defects, corrosion, etc., behave more like breathing (closing) crack. We study the inverse problem of determining multiple cracks in a planar conductor by electrostatic measurements at the boundary.

We prove that two measurements at the boundary suffice to identify multiple cracks with any number of components. We treat the problem under no regularity assumptions on the cracks and on the background conductivity. Automatic crack detection from images is an important task that is adopted to ensure road safety and durability for Portland cement concrete (PCC) and asphalt concrete (AC) pavement.

Pavement failure depends on a number of causes including water intrusion, stress from heavy loads, and all the climate effects. Generally, cracks are the first distress that arises on road surfaces and proper. For the case of no contact between opposing surfaces of the IGC (i.e.

0% surface contact) we see that when the cracks are small there are differences in the crack shapes associated with the two and four initial cracks cases, i.e. Case A and Case B, as shown in Fig. 18, Fig. 19 repsectively. The fatigue crack shapes have been indicated/presented. Publisher Summary.

This chapter introduces a book that focuses on the fracture mechanics of structural concrete. The book aims to discuss the latest developments in computational theories on multiple-crack analysis and mixed-mode fracture in structural concrete and the application of these theories to solve important engineering problems.

EFM-Res. note-FMT-2 1/25/Jan 1 A comparison of two algorithms for solving closed crack problems Jean-Claude De Bremaeckera*, Michael Ferrisb aDepartment of Geology and Geophysics, Rice University, BoxHouston, TX bDepartment of Computer Sciences, University of Wisconsin, Madison, WI In a recent paper Elvin and Leung [1] demonstrated the advantages of.

The ability to do crack propagation simulations relies on computing accurate stress intensity factors (SIFs) at crack tips. For many years, the standard quarter-point shape functions have been.

The paper presents the development of the visualization algorithm for propagating cracks. The novel algorithm is based on the cell attribute obtained from the damaged lattice connections employed. Computer Vision Based Crack Detection and Analysis Prateek Prasanna, Kristin Dana, Nenad Gucunski and Basily Basily the labeling for cracked and uncracked points was done by visual inspection.

The classiļ¬cation algorithm was tested on crack and non-crack regions and the confusion matrix below shows the results obtained. Various studies concerning crack loads have been performed, for example the crack of beam structures using a new cracked Euler-Bernoulli beam element, using Genetic Algorithm detection [1].

The 3. If a quantum system had to crack a bit key, it would take about as much time as a conventional computer needs to crack a bit key. A quantum computer could crack a cipher that uses the RSA.

The importance of crack propagation in the structural behaviour of concrete and masonry structures has led to the development of a wide range of finite element methods for crack simulation. A common standpoint in many of them is the use of tracking algorithms, which identify and designate the location of cracks within the analysed structure.

In this way, the crack modelling techniques, smeared. In the aerospace and aviation sectors, the damage tolerance concept has been applied widely so that the modeling analysis of fatigue crack growth has become more and more significant.

Since the process of crack propagation is highly nonlinear and determined by many factors, such as applied stress, plastic zone in the crack tip, length of the crack, etc., it is difficult to build up a general.Crack propagation was quantitatively evaluated to investigate the effect of electropulsing treatment (EPT) on fatigue crack growth of copper specimens.

Varying fatigue cycles were obtained under six different load levels. The crack lengths were measured under two load levels to examine the effect of cyclic stress. The microhardness was measured around the vicinity of the crack tip.The 8-bit RGB image of a cracked concrete surface, obtained with a high-resolution camera based on a close-distance photographing and using an optical microscope, is used to estimate the geometrical parameters of the crack.

The parameters such as the crack&#x;s width, depth, and morphology can be determined by the pixel intensity distribution of the image. For the estimation, the image is.