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Created page with "{{Language_sel|LANG=ger|ARTIKEL=Energiebilanz IKBV}} {{PSM_Infobox}} Energy balance in instrumented notch impact tests (ICIT) __FORCETOC__ ==Condition for impact testing== A necessary prerequisite for the vibrationally accurate recording of impact load–time and impact load–deflection diagrams and the fracture mechanical determination of characteristic values, i..."

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{{Language_sel|LANG=ger|ARTIKEL=Energiebilanz IKBV}}
{{PSM_Infobox}}
Energy balance in instrumented notch impact tests (ICIT)
__FORCETOC__

==Condition for impact testing==

A necessary prerequisite for the vibrationally accurate recording of impact load–time and impact load–deflection diagrams and the [[Fracture Mechanical Testing|fracture mechanical determination]] of [[Material Value|characteristic values]], in particular on the basis of the onset of unstable [[Crack Propagation|crack propagation]] (''F''max, ''f''max), is the control of the energy balance.

In the [[Instrumented Charpy Impact Test|instrumented Charpy impact test]] (ICIT), the impact energy ''A''H provided by the pendulum hammer for the [[Fracture Formation|fracture process]] must be greater than three times the total deformation energy AG consumed by the [[Specimen|test specimen]].

{|
|-
|width="20px"|
|width="500px" | <math>A_{H}>3 A_{G} \! </math>
|(1)
|}

==Control of kinetic energy==

The following applies to the kinetic energy imparted to the [[Specimen|test specimen]] during an [[Impact Loading Plastics|impact loading test]] on [[Plastics|plastics]]

{|
|-
|width="20px"|
|width="500px" | <math>X<2\,\%</math>
|(2)
|}

with
{|
|-
|''X''
|width="15px" |
|magnitude of error
|}

{|
|-
|width="20px"|
|width="500px" | <math>X\,=\,\frac{m_s}{m_p}\left(\frac{A_H}{A_G}-1\right)</math>
|(3)
|}

with
{|
|-
|''m''s
|width="15px" |
|weight of the SENB-specimen
|-
|''m''p
|
|weight of pendulum hammer
|}

==Energy balance==

Adherence to the energy balance according to '''Eq. (1)''' in the ICIT is a necessary prerequisite for evaluating the [[Toughness|toughness]] of [[Plastics|plastics]] and [[Fibre-reinforced Plastics|composite materials]] with geometry-independent (see: [[Geometry Criterion|geometry criterion]]) fracture mechanical [[Material Parameter|parameters]] (see: [[Fracture Mechanical Testing|fracture mechanical testing]]).

==See also==

* [[Instrumented Charpy Impact Test|Instrumented Charpy impact test]]
* [[ICIT – Experimental Conditions|ICIT – Experimental conditions]]
* [[Impact Loading Pendulum Impact Tester|Impact loading pendulum impact tester]]
* [[Impact Loading Plastics|Impact loading plastics]]
* [[MPK-Procedure MPK-ICIT]]
* [[ICIT – Influence of pendulum hammer velocity|ICIT – Influence of pendulum hammer velocity]]

==References==

* [[Grellmann,_Wolfgang|Grellmann, W.]]: Fracture Toughness Measurements in Engineering Plastics. In: [https://www.researchgate.net/profile/Wolfgang-Grellmann Grellmann, W.], [[Seidler,_Sabine|Seidler, S.]] (Eds.): Polymer Testing. Carl Hanser, Munich (2022) 3rd Edition, pp. 248–250 (ISBN 978-1-56990-806-89; E-Book: ISBN 978-1-56990-807-5; see [[AMK-Library]] under A 22)
* [https://de.wikipedia.org/wiki/Wolfgang_Grellmann Grellmann, W.]: Beurteilung der Zähigkeitseigenschaften von Polymerwerkstoffen durch bruchmechanische Kennwerte. Habilitation (1986), [https://de.wikipedia.org/wiki/Technische_Hochschule_Leuna-Merseburg Technische Hochschule Leuna-Merseburg], Wiss. Zeitschrift TH Merseburg 28 (1986), No. 6, pp. 787–788 ([https://www.polymerservice-merseburg.de/fileadmin/inhalte/psm/veroeffentlichungen/Habil_Grellmann_Inhaltsverzeichnis.pdf Content], [https://www.polymerservice-merseburg.de/fileadmin/inhalte/psm/veroeffentlichungen/Habil_Grellmann_Kurzfassung.pdf Summary])
* Grellmann, W., Sommer, J.-P.: Beschreibung der Zähigkeitseigenschaften von Polymerwerkstoffen mit dem J-Integralkonzept. Institut für Mechanik, Berlin und Karl-Marx-Stadt, Fracture Mechanics, Micromechanics and Coupled Fields – (FMC)-Series (1985), No. 17, pp. 48–72
* [[MPK-Procedure_MPK-ICIT]] (2016-08): Testing of Plastics – Instrumented Charpy Impact Test (ICIT): Procedure for Determination the Crack Resistance Behaviour using the Instrumented Impact Test

[[Category:Fracture Mechanics]]
[[Category:Instrumented Impact Test]]

Energy Balance ICIT - Revision history