Speckle pattern optimization for DIC technologies

Szalai, Szabolcs; Dogossy, Gábor

doi:10.14513/actatechjaur.00573

Cited by 16 publications

(7 citation statements)

References 20 publications

(36 reference statements)

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“…In the present paper, a new method is introduced and detailed: digital image correlation method (DIC method or DICM) (Szalai, 2021;Szalai & Dogossy, 2021) for measuring a real ballasted railway permanent way in the laboratory. The DICM is relatively new in civil engineering; however, the mechanical engineering applications are also well-known.…”

Section: Reports In Mechanical Engineeringmentioning

confidence: 99%

Investigation of deformations of ballasted railway track during collapse using the Digital Image Correlation Method (DICM)

Szalai¹,

Eller²,

Juhász³

et al. 2022

Rep. Mech. Eng.

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This paper summarizes the results of laboratory tests in which the authors investigated the effects of extremely high vertical load to a railway track segment. The segment consisted of a cut concrete sleeper (contact area: 290×390 mm) with a pair of direct-elastic rail fasteners; the sleeper pieces had a standard, full height; the structure had a typical 350 mm depth railway ballast, underneath approx. 200 mm sandy gravel supplementary layer. The whole assembly was built in a 2.00×2.20 m area wooden rack. The deformations due to the approx. 150 kN static concentrated vertical force were measured and recorded by Digital Image Correlation Method (DICM), ensuring the GOM ATOS technology. The 150 kN peak load meant 1326 kPa vertical stress at the sleeper-ballast interface. The 3D geometry was scanned before the loading and after the collapse. In this way, the comparison was able to be executed. The maximum vertical deformation was 115 mm. The DICM technique is a relatively new methodology in civil engineering; however, it has been applied for more than ten years in mechanical engineering. Therefore, the authors investigated the applicability of DICM in this field. As a result, the pre and the post-states were determined in 3D. The displacement of the ballast particles was able to be defined with the possibility of drawing the displacement trajectories of given points. The DICM can be a valuable methodology in railway engineering, e.g., laboratory tests and field test applications.

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Section: Reports In Mechanical Engineeringmentioning

confidence: 99%

Investigation of deformations of ballasted railway track during collapse using the Digital Image Correlation Method (DICM)

Szalai¹,

Eller²,

Juhász³

et al. 2022

Rep. Mech. Eng.

Self Cite

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“…It should be noted that, as is the case for all DIC measurements, the precision of the displacement field estimates is highly dependent upon the quality of the pattern contrast and density. This has been the focus of numerous previous studies [58,59] and the good practice guidance outlined in these studies was followed to refine the patterns used in this study. The next step is to align the hole-drilling rig using the live camera view.…”

Section: Semi-automatic Modementioning

confidence: 99%

A Novel Low-Cost DIC-Based Residual Stress Measurement Device

Arabul¹,

Lunt²

2022

Applied Sciences

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Residual stress often has a significant impact on part performance and lifetime. Existing measurement techniques using strain gauges or non-destructive methods are often expensive and time-consuming. This paper presents a low-cost, novel measurement device that uses digital image correlation with the hole-drilling method to quantify the magnitude and preferred orientation of these locked-in forces. A two-axis measurement device that rapidly drills and images the surface around the hole was developed to measure residual stresses as a function of depth with sub-millimetre resolution. Validation of the device and DIC methodology was performed using a four-point bending specimen and comparison with conventional strain gauge methods. The results showed strong correlations between the two measurement techniques, as well as the theoretical estimates. The total cost of production was estimated to be approximately £380, which is significantly cheaper than competitors. The device also substantially reduced the cost per measurement point (less than £1 vs. £50+) and shortened the experiment duration from 2 h per point to 45 min per measurement. A functional, rapid, economical device has been designed and produced, which is currently being used for residual stress analysis of industrial samples. The presented design is completely open-source, and the relevant links are provided.

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“…The following disciplines are considered to be closely related to transport sciences: (i) transport engineering with logistics-transport-packaging sub-disciplines [1][2][3][4][5], (ii) civil engineering [6][7][8][9][10][11][12][13], (iii) mining and metallurgical engineering [11,12,14], (iv) urban, municipal and architectural engineering [15,16], (v) mechanical engineering [17][18][19][20][21], (vi) electrical engineering [7,[22][23][24][25][26], and (vii) vehicle engineering However, in reality, these fields often entirely overlap, or overlap to a lesser or greater extent.…”

Section: Introductionmentioning

confidence: 99%

Investigation of “Open” Superstructure Tramway Tracks in Budapest

et al. 2023

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The most important thing nowadays is to use available resources to develop infrastructure as efficiently as possible. In this regard, evaluating the deterioration of tramway tracks is critical from both a technical and an economic viewpoint. In Hungary, seven types of superstructure systems are currently differentiated in the case of tramway transport, but the geometrical deterioration, lifecycle, and lifecycle cost of the tramway tracks are not accurately known. The current study aimed to evaluate and compare the results of track geometry measurements of two different “open” tramway superstructure systems depending on their traffic load and age. The geometry measurements we re executed by TrackScan 4.01 instrument, developed and maintained by a Hungarian developer company called Metalelektro Méréstechnika Ltd. The evaluation of the measurements showed a clear relationship between the traffic load, age, and track deterioration. Based on the results, it can be generally stated, concerning “open” superstructure systems, that regardless of the “open” superstructure system or the level of traffic load, the average value of alignment is decreasing; however, the average value of the longitudinal level is increasing. Furthermore, the deterioration of an older ballasted track with lower traffic is similar to that of a younger ballasted track that has a higher traffic load. Another significant result was that the deterioration of the track gauge parameter in the case of concrete slab tracks is clearly described as the broadening of the track gauge.

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Speckle pattern optimization for DIC technologies

Cited by 16 publications

References 20 publications

Investigation of deformations of ballasted railway track during collapse using the Digital Image Correlation Method (DICM)

Investigation of deformations of ballasted railway track during collapse using the Digital Image Correlation Method (DICM)

A Novel Low-Cost DIC-Based Residual Stress Measurement Device

Investigation of “Open” Superstructure Tramway Tracks in Budapest

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