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{{Language_sel|LANG=ger|ARTIKEL=Laserextensometrie}}
{{PSM_Infobox}}
<span style="font-size:1.2em;font-weight:bold;">Laser extensometry</span>
__FORCETOC__

==Recording of local strain==

The [[Deformation|deformation]] and [[Fracture Behaviour|fracture behaviour]] of [[Plastics|plastics]] in the [[Tensile Test|tensile test]] is significantly influenced not only by the test conditions but also by the internal condition of the [[Material & Werkstoff|material]] during manufacture. The [[Polymers & Structure|structure]] and morphology parameters (see: [[Microscopic Structure|microscopic structure]]) of the tested [[Specimen|specimens]] therefore determine not only the temporal and local deformation process, but also the area and type of upstream damage behaviour (see: [[Micro-Damage Limit|micro-damage limits]]). The deformation process of heterogeneous and [[Anisotropy|anisotropically]] structured plastics is basically always associated with a localization of the externally homogeneous deformation. A spatially resolved strain measurement technique such as laser extensometry is therefore required to understand these processes. Laser extensometry generally refers to scanning measurement techniques that are based on the transmission or reflection principle and use the [[Specimen|test specimen]] as a radiation obstacle or reflector.

The deformation measurement is based on the determination of time, which refers to the scanning speed of a rotating mirror or prism. To record the local strain (see: [[Laser Heterogeneity of Strain Distribution | laser heterogeneity of strain distribution]]), the test specimens must be provided with measuring marks or reflectors. The marks can be applied as a foil mask using a screen or pad printing process, or by simple light-dark contrasting using a spray or brush.

==Laser extensometry – Device systems==

To determine the local deformation behaviour, the following device systems are explained in detail in the Wiki-lexicon: “Polymer Testing & Diagnostics”:

* [[Laser Double-Scanner|Laser double-scanner]]
* [[Laser Doppler-Scanner|Laser doppler-scanner]]
* [[Laser Heterogeneity of Strain Distribution | Laser heterogeneity of strain distribution]]
* [[Laser Longitudinal–Transverse Scanner|Laser longitudinal–transverse scanner]]
* [[Laser Multi-Scanner|Laser multi-scanner]]
* [[Laser Parallel-Scanner|Laser parallel-scanner]]
* [[Laser Cross-Unit|Laser cross-unit]]
* [[Laser TMA-Scanner|Laser TMA-scanner]]
* [[Laser Angle-Scanner|Laser angle-scanner]]
* [[Hybrid Methods, Examples|Hybrid methods, examples]]

'''References'''

* [[Bierögel,_Christian|Bierögel, C.]], [[Grellmann,_Wolfgang|Grellmann, W.]], Fahnert, T., Lach, R.: Material Parameters for Evaluation of Polymer Welds using Laser Extensometry. Polymer Testing 25 (2006) 1024–1037; http://dx.doi.org/10.1016/j.polymertesting.2006.07.001
* [https://www.researchgate.net/profile/Wolfgang-Grellmann Grellmann, W.], Bierögel, C.: Laserextensometrie anwenden. Einsatzmöglichkeiten und Beispiele aus der Kunststoffprüfung. Materialprüfung 40 (1998) 11–12, 452−459
* Bierögel, C.: Hybrid Methods of Polymer Diagnostics. In: [https://de.wikipedia.org/wiki/Wolfgang_Grellmann Grellmann, W.], [[Seidler, Sabine|Seidler, S.]] (Eds.): Polymer Testing. Carl Hanser Verlag, Munich (2022), 3rd Edition pp. 497–513; (ISBN 978-1-56990-806-8; E-Book-ISBN 978-1-56990-807-5; see [[AMK-Büchersammlung | AMK-Library]] under A 22)
* Grellmann, W., Bierögel, C., König, S.: Evaluation of Deformation Behaviour of Polyamide using Laserextensometry. Polymer Testing 16 (1997) 225–240, DOI: https://doi.org/10.1016/S0142-9418(96)00044-X

[[Category:Laser Extensometry]]

Laser Extensometry - Revision history