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{{Language_sel|LANG=ger|ARTIKEL=Lochbildung Folie}}
{{PSM_Infobox}}
<span style="font-size:1.2em;font-weight:bold;">Hole formation films</span>
__FORCETOC__

==General information==

When analysing damage to [[Thermoplastic Material|thermoplastic]] products (see: [[Failure Analysis – Basics|failure analysis – basics]]), damage caused by faulty design, processing and material selection, as well as defects (see also: [[Errors|errors]]) in the matrix material and additives, or even defects that occur during use, are analysed using [[Polymer Testing|polymer testing]] and [[Polymer Diagnostic|diagnostic]] methods (see also: [[Failure Analysis Plastics Products, VDI Guideline 3822|damage analysis of plastic products, VDI Guideline 3822]]).

Damage that occurs during the use of plastic products can cause a variety of damage patterns. In the context of the ‘[[Cover Wiki-lexicon: Polymer Testing & Diagnostics|Wiki-lexicon Polymer Testing & Diagnostics]]’, the damage phenomenon ‘[[Hole Formation Plastics|Hole formation plastics]]’ is examined using examples from the evaluation of the [[Deformation|deformation]] and [[Fracture Behaviour|fracture behaviour]] of [[Fibre-reinforced Plastics|fibre-reinforced plastics]], particularly at the fibre/matrix [[Fibre-Matrix Adhesion|interface]]. Two examples of this are listed under

* [[Fibre-Matrix Adhesion|Fibre–matrix adhesion]] and
* [[In-situ Tensile Test in ESEM with AE|In-situ tensile test in ESEM with AE]].

==Hole formation in a biopolymer film==

Another example of the damage phenomenon ‘Hole formation’ as a result of artificial weathering is shown in '''Figure 1''' [1]. A conventionally available biopolymer film (see also: [[Bio-Plastics|bio-plastics]]) with the trade name Mater-Bi® (mulch film), a starch blend based on corn starch, with a thickness of 15 µm was subjected to 30 hours of artificial weathering.

[[file:Lochbildung-1.JPG|500px]]
{|
|- valign="top"
|width="50px"|'''Fig. 1''':
|width="600px"|Hole formation in a Mater-Bi® mulch film after 30 hours of artificial weathering
|}

'''Figure 1''' shows a [[Surface|surface]] damaged by artificial weathering. Holes have begun to form, and it is clear that damage to the surface of the biopolymer film is beginning.

==See also==

* [[Hole Formation Plastics|Hole formation plastics]]
* [[Film Testing|Film testing]]
* [[Fracture Behaviour|Fracture behaviour]]
* [[Hybrid Methods, Examples|Hybrid methods, example]]
* [[Instrumented Adhesion Test|Instrumented adhesion test]]

'''References'''

{|
|-valign="top"
|[1]
|Monami, A., Langer, B., [[Grellmann, Wolfgang|Grellmann, W.]]: Modern Methods of Polymer Testing for Material Development and Testing of Components. Werkstoffprüfung 2016, Fortschritte in der Werkstoffprüfung für Forschung und Praxis 1. and 2.12.2016, Neu-Ulm, Proceedings pp. 119–124 (ISBN 978-3-514-00830-4)
|}

[[category:Film Testing]]
[[category:Damage Analysis_Component Failure]]

Hole Formation Films - Revision history