Oluschinski: Created page with "{{Language_sel|LANG=ger|ARTIKEL=Biegeversuch Prüfeinflüsse}} {{PSM_Infobox}} Bend test − Test influences FORCETOC ==Bend test − Test influences== So-called self-adjusting supports are still sometimes used in the practical testing bend tests ('''Fig. 1a'''). These test systems work very well with metallic materials, since the forces generated are much greater than wit..."

2025-11-28T13:20:44Z

Created page with "{{Language_sel|LANG=ger|ARTIKEL=Biegeversuch Prüfeinflüsse}} {{PSM_Infobox}} <span style="font-size:1.2em;font-weight:bold;">Bend test − Test influences</span> __FORCETOC__ ==Bend test − Test influences== So-called self-adjusting supports are still sometimes used in the practical testing bend tests ('''Fig. 1a'''). These test systems work very well with metallic materials, since the forces generated are much greater than wit..."

New page

{{Language_sel|LANG=ger|ARTIKEL=Biegeversuch Prüfeinflüsse}}
{{PSM_Infobox}}
<span style="font-size:1.2em;font-weight:bold;">Bend test − Test influences</span>
__FORCETOC__

==Bend test − Test influences==

So-called self-adjusting [[Support Distance | supports]] are still sometimes used in the practical testing [[Bend Test | bend tests]] ('''Fig. 1a'''). These test systems work very well with metallic materials, since the forces generated are much greater than with plastics. Since experience has shown that the maintenance condition of such devices has a considerable influence, and an exactly plane-parallel bearing of the test [[Specimen | specimens]] is problematic, additional stress components ('''Fig. 1b''') can arise which are not taken into account in the calculation.

[[file:Bend Test - Test Influences 1.jpg]]
{|
|- valign="top"
|width="50px"|'''Fig. 1''':
|width="600px" |Influence of incline bending and torsional moments on stress distribution
|}

The so-called inline (skew) bending, i.e. bending around two axes of the [[Specimen | specimen]], can occur as a result of the resulting misalignment of the bending device and thus leads to increased material stress. As can be seen from Fig. 1b, a torsional component will usually occur at the same time, which is not negligible. Considering the superposition of the different stress components, e.g. in the shape change hypothesis, it becomes clear that the comparative stress adequately describes the material effort. If additional stresses now occur, this value remains identical, but the weighting of the individual stress components shifts. In the worst case, therefore, the flexural strength calculated is always too low, since it is based only on the normal stress arising in the cross-section and does not include the other stress components [1].

==See also==

*[[Bend Test | Bend test]]
*[[Bend Test – Specimen Preparation | Bend test – Specimen preparation]]
*[[Bend Test – Shear Stress | Bend test – Shear stress]]
*[[Bend Loading | Bend loading]]
*[[Bend Test – Specimen Shapes | Bend test – Specimen shapes]]
*[[Bend Test – Yield Stress | Bend test – Yield stress]]

'''Reference'''

{|
|-valign="top"
|[1]
|[[Bierögel,_Christian|Bierögel, C.]]: Bend Test on Polymers. In: [[Grellmann,_Wolfgang|Grellmann, W.]], [[Seidler,_Sabine|Seidler, S.]] (Eds.): Polymer Testing. Carl Hanser Munich (2022) 3. Edition, 133–143 (ISBN 978-1-56990-806-8; see under [[AMK-Büchersammlung|AMK-Library]] A 22)
|}

[[Category:Bend Test]]

Bend Test – Test Influences - Revision history