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A method and device for determination of mechanical properties of materials


Abstract

The non-contact determination of deformation and flow properties of materials is a technological challenge and thus represents an important field of study in material engineering. The present invention using the acoustically induced laser scattering (ALS) avoids these disadvantages by applying the principle of the acousto-optical modulation. By an appropriate arrangement of an ultrasonic source, a sonic grid which diffracts laser light is generated in the material.


Background

The non-contact determination of deformation and flow properties of materials is a technological challenge and thus represents an important field of study in material engineering. At present, there is not a satisfactory solution for it. This invention presents a method which addresses the aforementioned thematic and is suitable for the investigation of a variety of elastic and viscoelastic materials as well as glasses and liquids.


Problem

The rheometry offers the possibility to characterize materials concerning their different loads (e.g. shear deformation, tensile deformation and bending deformation). These rheological properties are determined by applying mechanical stress which largely causes destruction of the probed component. In addition, it is a time consuming measurement which requires the preparation of specimens. The practical implementation of rheological investigations is therefore complicated and for industrial uses not economical.


Solution

The present invention using the acoustically induced laser scattering (ALS) avoids these disadvantages by applying the principle of the acousto-optical modulation. By an appropriate arrangement of an ultrasonic source, a sonic grid which diffracts laser light is generated in the material. By exclusively using the diffraction peak of the laser light in a test object, the invention enables new possibilities of non-invasive determination of relevant rheological and other mechanical properties. With this method, a non-destructive measurement of little technical effort and very short measuring times gets possible. Especially it is, in contrast to conventional rheometers, suitable for in situ measurements. Thus, the invention has a big market potential in the fields of materials science, materials testing and quality assurance.


Advantages

  • Non-destructive determination of rheological and mechanical material properties
  • In situ measurement with shorter measurement periods and lower preparative effort

Scope of application

  • Measurement technology
  • Material engineering

Service

  • Disposition
  • Concession agreement
  • Development cooperation

PVA Mecklenburg-Vorpommern AG

Christian Tholen
+49 381 497474-38
c.tholen@pva-mv.de
www.pva-mv.de
Address
Gerhart-Hauptmann-Straße 23
18055 Rostock



Development status

Trial


Patent situation

  • DE 10 2015 202 772 pending
  • WO 000 2016 053 246 pending

Keywords

Measurement technology, Material engineering, deformation, mechanical properties of materials, rheometry, mechanical stress, determination, ultrasonic source, ALS, laser scattering, acousto-optical modulation,

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