Oluschinski: Created page with "{{Language_sel|LANG=ger|ARTIKEL=Interlaminare Scherfestigkeit}} {{PSM_Infobox}} Interlaminar shear strength FORCETOC ==Short-beam bend test== For determining the interlaminar shear strength (ILSF) of fiber-reinforced composites, the short beam test is used as a typical method for quality assurance. '''Fig. 1''' shows a test device (Wyoming Test Fixture) with test specimen as an add-on unit for a universal testing..."

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{{Language_sel|LANG=ger|ARTIKEL=Interlaminare Scherfestigkeit}}
{{PSM_Infobox}}
<span style="font-size:1.2em;font-weight:bold;">Interlaminar shear strength</span>
__FORCETOC__
==Short-beam bend test==
For determining the interlaminar shear strength (ILSF) of fiber-reinforced composites, the short beam test is used as a typical method for quality assurance. '''Fig. 1''' shows a test device (Wyoming Test Fixture) with test specimen as an add-on unit for a universal testing machine, which can be used in three- and four-point bending systems (see: [[Bend Test|bend test]]).

[[file:Short-beam-tester.png|350px]]
{|
|- valign="top"
|width="50px"|'''Fig. 1''':
|width="600px" |Test equipment with test specimen for short-beam bend test
|}

==Determination of characteristic parameters==

The apparent shear strength determined by the short bend test is the maximum shear stress present in the neutral fiber of the test [[specimen]] at the moment of the first failure. The resistance to interlaminar shear stress is determined parallel to the layers of the laminate, which provides information on the fiber/matrix bonding. The test can be carried out in accordance with ASTM D 2344, DIN EN 2563 or ISO 14130, which differ in the required L/D ratio, the test specimen length, the support dimensions and the test velocities. The schematic representation of the test arrangements and the test specimen geometries are shown in '''Figures 2 a''' and '''b''' as well as '''c'''.

[[file:Interlaminare Scherfestigkeit Bild 1.JPG.jpg|500px]]
{|
|- valign="top"
|width="50px"|'''Fig. 2''':
|width="600px" |Schematic representation of the short beam test according to ASTM D 2344 (a), DIN EN 2563 (b) and ISO 14130 (c)
|}

==Interlaminar shear strength (ILSF)==

The interlaminar shear strength is calculated according to the following equation.
{|
|-
|width="20px"|
|width="500px" | <math>\tau_{12}\,=\,\frac{3}{4}\,\frac{F}{B\cdot d}</math>
|}

with
{|
|-
|F
|width="15px" |
|compression load
|-
|B
|
|width
|-
|d
|
|thickness
|}

This test is suitable for the quality monitoring of sheared components since only small test specimens have to be machined out.

==See also==

*[[Bend Test | Bend test]]
*[[Bend Test – Influences | Bend test – Influences]]
*[[Bend Test – Yield Stress | Bend test – Yield stress]]
*[[SENB-Specimen | SENB-specimen]]
*[[Specimen | specimen]]

'''References'''

* ASTM D 2344/ D 2344 M (2022): Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and their Laminates
* DIN EN 2563 (1997-03): Aerospace Series – Carbon Fibre Reinforced Plastics – Unidirectional Laminates – Determination of Apparent Interlaminar Shear Strength
* ISO 14130 (1997-12): Fibre-reinforced Plastic Composites – Determination of Apparent Interlaminar Shear Strength by Short-beam Method; Technical Corrigendum 1: 2003-11
* [http://192.168.81.5/wiki/index.php/Altst%C3%A4dt,_Volker Altstädt, V.]: Testing of Composite Materials. In: [[Grellmann,_Wolfgang|Grellmann, W.]], [[Seidler,_Sabine|Seidler, S.]] (Eds.): Polymer Testing. Carl Hanser Munich (2022) 3rd Edition, 537–538 (ISBN 978-1-56990-806-8; ePub ISBN 978-1-56990-808-2; see [[AMK-Büchersammlung|AMK-Library]] under A 22)

[[Category:Bend Test]]
[[Category:Morphology and Micromechanics]]

Interlaminar Shear Strength - Revision history