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Strength and strain mechanical observation using Holography Interferometry

Antonio Brozičević

Regional Centre for Talented Youth Belgrade II, Serbia

pattern of resins and
1 Introduction mechanicalcomponents.

Holography is a technique that enables three-dimensional
images to be formed. Holography, with its unique depth of
field and interferometric capabilities, is a powerful new
tool for the study of strength and strain properties of
materials. Strength and strain of materials are very
important physical characteristics. Each material
havedifferent physical properties. In our modern world
those characteristics are very important for materials and
their applications. Holography enables us to observe their Figure 1.
unique characteristics and their weak points.In this
observation we test various materials throughout
Holography Interferometry technique. Holography 4 Results of investigation
provides very accurate results, which are essential for
complex material analysis. These results characterize holographic real-time
measurements and analysis ofmaterial hardeningand
different types of mechanical stresses. While hardening
2 Purpose of Investigation process take place we analyze mechanical properties of
dental resins. A series of 10 experimental samples were
The purpose of investigation is to analyze and investigate analyzed. We conclude that all 10 samples, which varied
various materials and their mechanical and physical in their size, results obtain pretty much the same values
properties using Holography Interferometry technique. without any large oscillations between samples.
Holography enables three- dimensional observation of Throughout interferogram analysis we conclude that at the
materials, which is very essential feature for complex beginning of process during first seconds after material is
material examination. This technique will significantly lightened there is no recognizable change, after about 10
improve our understanding of materials properties, and second obvious difference can be observed. The maximum
their weak points. Also this technique provides very fast deformation is attained at the end of process. From results
and accurate results, which can be used as essential we conclude that resin deformation starts to travel down
diagnostic tool for material study. from the place were it is lightened, and start to contract
material which is around. Different types of mechanical
components such as gear wheels, which are tested,have
certain points where they excerpt more stress points then
3 Method of the investigation on other places. Also every type of mechanical component
have their own weak points. Every mechanical component
A Schematic view of the real-time holographic setup is that was observed have their own properties that enable
shown in Figure 1. Long coherence length, 532 nm second usage in specific area of industry.
harmonic Nd-YAG, laser was used. A beam was split and
one beam was used to illuminate a material, while the 5 Conclusion
second beam was utilized as a reference to irradiate the
holographic plate (VRP-M green sensitive emulsion, These experiments represent results of holographic real-
produced by Slavich, Russia). Materials and components time measurements of dental resin structure deformations
used in this investigation are dental composite resins, and and mechanical components deformations.Physical
mechanical components used in industry. Mechanical stresses which acts on them are observed thru ought
components are different types of gear wheels, bearings, interferograms. This technique enables testing of various
and various metals. Mechanical components are exposed mechanical components, photosensitive resins and
to different mechanical stresses and observed trough materials, with the aim to improve their mechanical
interferograms.Dental resins used in this investigation properties. This technology could significantly improve
arelight –activated, which cure and quickly harden when materials in future, which will be more permanent and
exposed to specific light spectrum.Blue LED, (450-480nm durable.
wavelength) lamp is used to activate resin. It was
necessary to use filters, in order to reject LED lamplight, 6 References [1] MilesaSrećković“LaserskaTehnika”,
and transmit 532 nm interference patterns.CCD camera (Serbia) Belgrade, 1998
and computer detected and recorded the interference