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{{Language_sel|LANG=ger|ARTIKEL=Mikroschädigungsgrenze}}
{{PSM_Infobox}}
<span style="font-size:1.2em;font-weight:bold;">Micro-damage limit</span>
__FORCETOC__

==Importance of introducing micro-damage limits==

The Knowledge of the micro-damage limit of [[Plastics | plastics]] is particularly important for an event-related interpretation of the deformation phases of stress tests (especially [[Quasi-static Test Methods | quasi-static]] [[Tensile Test | tensile tests]], [[Bend Test | bending tests]], [[Instrumented Charpy Impact Test | instrumented Charpy impact tests]]) and the dimensioning of plastic [[Component Testing | components]] (damage mechanics).

==Definition of limit values and specification of quantitative values==

The micro-damage limit is a range in which the first irreversible damage induced by loads occurs, which is usually invisible and is not characterised by a changed habitus in the stress–strain diagram.

The stress or strain in the transition from [[Linear-viscoelastic Behaviour|linear-viscoelastic]] to non-linear-viscoelastic behaviour (see: [[Elasticity|elasticity]]) can be used as a quantitative value for determining the onset of micro-damage, but it is not possible to determine these values precisely using conventional tensile testing alone.

Here, coupled measurement methods such as

* [[Instrumented Charpy Impact Test | Instrumented Charpy impact test]] (ICIT) with acoustic emission,
* [[Tensile Test|Tensile test]] and [[Acoustic Emission|acoustic emission]] analysis,
* Tensile test/acoustic emission/thermography.

must be used, which react sensitively to structural changes in the [[Material & Werkstoff|material]]. In addition, morphological analyses must be carried out before and after loading.

The coupled measurement methods are also referred to in the literature as in-situ methods or sensor-based methods or [[Hybrid Methods|hybrid methods of polymer diagnostics]].

==See also==

* [[Laser Extensometry | Laser extensometry]]
* [[Instrumented Hardness Testing – Method & Material Parameters | Instrumented hardness testing – Method & Material parameters]]
* [[Polymer Testing | Polymer testing]]
* [[Heterogeneity]]
* [[Elasticity]]

'''References'''

* [[Grellmann,_Wolfgang|Grellmann, W.]], Langer, B.: Methods for Polymer Diagnostics for the Automotive Industry. Materialprüfung 55 (2013) 17–22 [https://www.polymerservice-merseburg.de/fileadmin/inhalte/psm/veroeffentlichungen/Methods_for_Polymer_Diagnostics_for_the_Automotive_Industry__Grellmann_Langer_2013_.pdf Download as pdf]
* [[Bierögel, Christian|Bierögel, C.]]: Hybrid Methods of Polymer Diagnostics. In: [https://www.researchgate.net/profile/Wolfgang-Grellmann Grellmann, W.], [[Seidler,_Sabine|Seidler, S.]] (Eds.): Polymer Testing. Carl Hanser, Munich (2022) 3rd Edition, pp. 497–514 (ISBN 978-1-56990-806-8; E-Book: ISBN 978-1-56990-807-5; see [[AMK-Büchersammlung | AMK-Library]] under A 22)

Micro-Damage Limit - Revision history