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Applied Sciences
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Optical Methods in Applied Mechanics
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Optical Methods in Applied Mechanics

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (30 March 2024) | Viewed by 3066

Special Issue Editor

Dr. Martin Hagara

E-Mail Website
Guest Editor
Department of Applied Mechanics and Mechanical Engineering, Technical University of Košice, 042 00 Košice, Slovakia
Interests: full-field optical methods; modal analysis; stress/strain analysis; residual stress

Special Issue Information

Dear Colleagues,

I am pleased to announce the Special Issue “Optical Methods in Applied Mechanics”, which will appear in Applied Sciences this year.

Currently, many issues are being addressed and solved by automated and user-friendly optical methods. Optical methods allow us to perform full-field displacement and strain analysis of structures under static or dynamic loading. Due to their noncontact nature, they do not influence the response of the investigated objects. Therefore, the results obtained by optical methods represent reality, and can be used to validate computational models.

This Special Issue intends to collect advances in the development and use of full-field optical methods such as digital image correlation, photoelasticity, holography, speckle interferometry, Moiré, and others. It is open to innovative contributions involving the following topics: solid mechanics, structural dynamics, fatigue and fracture, mechanics of composite materials, residual stress quantification, and experimental fluid mechanics (other relevant topics are also welcome).

I would be delighted if you submit an article for this Special Issue or inform your colleagues working in applied mechanics about this Special Issue.

Dr. Martin Hagara
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • optical methods
  • applied mechanics
  • solid mechanics
  • fluid mechanics
  • structural dynamics
  • residual stress

Published Papers (3 papers)

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Research

21 pages, 6062 KiB  
Article
Comparison of Tensile and Creep Properties of SAC305 and SACX0807 at Room Temperature with DIC Application
by Zbynek Paska, Radim Halama, Petr Dymacek, Bhuvanesh Govindaraj and Jaroslav Rojicek
Appl. Sci. 2024, 14(2), 604; https://doi.org/10.3390/app14020604 - 10 Jan 2024
Viewed by 669
Abstract
The contribution presents the verification of the methodology of accelerated creep tests from the point of view of obtaining more information about the stress–strain behaviour of the investigated materials using the Digital Image Correlation method. Creep tests are performed on SAC305 and SACX0807 [...] Read more.
The contribution presents the verification of the methodology of accelerated creep tests from the point of view of obtaining more information about the stress–strain behaviour of the investigated materials using the Digital Image Correlation method. Creep tests are performed on SAC305 and SACX0807 lead-free solders and are supplemented by numerical modelling using the finite element method, considering the viscoplastic model based on the theory of Perzyna, Chaboche, and Norton. The stress–strain behaviour of both solders appears to be very similar at applied strain rates of 0.0002–0.0026%/s and applied creep stresses of 15–28 MPa. Initially, the viscoplastic model is calibrated using an analytical approach. Then, the finite element model updating approach is used to optimise the material parameters based on the simultaneous simulations of creep and tensile tests. As a result, the total objective function value is reduced almost five times due to optimisation. The proposed type of accelerated test with an hourglass specimen proves to be suitable for calibrating the considered class of viscoplastic models. The main benefit is that a single specimen is required to obtain creep curves on various stress levels. Full article
(This article belongs to the Special Issue Optical Methods in Applied Mechanics)
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13 pages, 3869 KiB  
Article
Investigation of the Mechanical Properties of Spur Involute Gearing by Infrared Thermography
by Milan Sapieta, Vladimír Dekýš, Michal Kaco, Miroslav Pástor, Alžbeta Sapietová and Barbora Drvárová
Appl. Sci. 2023, 13(10), 5988; https://doi.org/10.3390/app13105988 - 12 May 2023
Cited by 2 | Viewed by 830
Abstract
The work aims at validating a methodology for 3D printing of gears with involute gearing and evaluating their mechanical properties using infrared camera. A general methodology for the setup of 3D printing of gears made of polymeric materials has been developed, which can [...] Read more.
The work aims at validating a methodology for 3D printing of gears with involute gearing and evaluating their mechanical properties using infrared camera. A general methodology for the setup of 3D printing of gears made of polymeric materials has been developed, which can be used in technical practice in order to replace parts produced by conventional methods. An experiment was prepared determination of the distribution of the 1st invariant of the stress tensor and phase shift using a modal exciter and an IR camera. The values of the 1st invariant of the stress invariant were found. For these measurements, the lock-in thermography method was used, using a modal exciter we force loaded a gear in which the response to the load was registered. The aim was to obtain the distribution of the strain or stress field on the loaded tooth. The experimental method used also belongs to the field of non-destructive testing (NDT), and with suitable experimental parameters we can also obtain information from the layers below the surface, as demonstrated in the phase images. The practical benefit is to provide a competitive advantage to companies that will exploit the properties of polymeric materials by knowing the mechanical properties of these materials. Full article
(This article belongs to the Special Issue Optical Methods in Applied Mechanics)
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13 pages, 3425 KiB  
Article
Development of Simultaneous Dual-Resolution Digital Holography System
by Xiaowan Zheng, Siyuan Fang, Bicheng Guo, Bernard Sia and Lianxiang Yang
Appl. Sci. 2023, 13(5), 2856; https://doi.org/10.3390/app13052856 - 23 Feb 2023
Viewed by 1086
Abstract
This research paper is focused on the development of a digital holography system for simultaneous dual-resolution measurements. Digital holography has been widely used for deformation measurements and non-destructive testing (NDT) due to its advantages of high sensitivity, high accuracy, and whole-field, non-touch measurements. [...] Read more.
This research paper is focused on the development of a digital holography system for simultaneous dual-resolution measurements. Digital holography has been widely used for deformation measurements and non-destructive testing (NDT) due to its advantages of high sensitivity, high accuracy, and whole-field, non-touch measurements. A traditional test only has one spatial resolution, which can cause a big deformation to be indistinguishable or minor defects to be ignored. Both large and small fields of view should be observed to reach a multi-spatial resolution measurement. Usually, multiple separate tests are used to observe the different sized fields of view, resulting in higher costs and longer required testing times. Furthermore, these tests may not be repeatable in some cases. This paper presents research on a novel digital holography system that achieves dual spatial resolution measurements simultaneously by testing different-sized fields of view with a single camera. The novel system has two optical channels with two optical layouts of holography to measure deformation. By changing the combined focus length, the two holographic setups have different fields of view, i.e., one has a large and the other has a small field of view. To realize a simultaneous test, the polarization technique is used to avoid cross-interference between the two optical layouts. Finally, spatial carrier fringes with different orientations are introduced into the two holographic setups by appropriately adjusting the reference beam of each setup. The different oriented spatial carrier fringes enable the spectrums of the two interferograms to be separated after a FT (Fourier transform) and the phase distributions of the two interferograms can be extracted and separated by windowing the spectrum to perform an IFT (inverse Fourier transform). The phase distributions can then be used to analyze and calculate the deformations. The experiment using this system is described in this paper and the practicability of this method is verified by the obtained experimental results. Full article
(This article belongs to the Special Issue Optical Methods in Applied Mechanics)
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