Energy Balance ICIT

Sprachauswahl/Language selection

Dieser Artikel ist auch auf Deutsch verfügbar Energiebilanz IKBV

A service provided by
Polymer Service GmbH Merseburg
Tel.: +49 3461 30889-50 E-Mail: info@psm-merseburg.de Web: https://www.psm-merseburg.de
Our further education offers: https://www.psm-merseburg.de/weiterbildung
PSM on Wikipedia: https://de.wikipedia.org/wiki/Polymer Service Merseburg

Energy balance in instrumented notch impact tests (ICIT)

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, in particular on the basis of the onset of unstable crack propagation (F_max, f_max), is the control of the energy balance.

In the instrumented Charpy impact test (ICIT), the impact energy A_H provided by the pendulum hammer for the fracture process must be greater than three times the total deformation energy AG consumed by the test specimen.

$A_{H}>3A_{G}\!$

(1)

Control of kinetic energy

The following applies to the kinetic energy imparted to the test specimen during an impact loading test on plastics

$X<2\,\%$

(2)

with

X

magnitude of error

$X\,=\,{\frac {m_{s}}{m_{p}}}\left({\frac {A_{H}}{A_{G}}}-1\right)$

(3)

with

ms		weight of the SENB-specimen
mp		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 of plastics and composite materials with geometry-independent (see: geometry criterion) fracture mechanical parameters (see: fracture mechanical testing).

See also

• Instrumented Charpy impact test
• ICIT – Experimental conditions
• Impact loading pendulum impact tester
• Impact loading plastics
• MPK-Procedure MPK-ICIT
• ICIT – Influence of pendulum hammer velocity

References

• Grellmann, W.: Fracture Toughness Measurements in Engineering Plastics. In: Grellmann, W., 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)
• Grellmann, W.: Beurteilung der Zähigkeitseigenschaften von Polymerwerkstoffen durch bruchmechanische Kennwerte. Habilitation (1986), Technische Hochschule Leuna-Merseburg, Wiss. Zeitschrift TH Merseburg 28 (1986), No. 6, pp. 787–788 (Content, 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