Oluschinski: Created page with "{{Language_sel|LANG=ger|ARTIKEL=Frequenzgangkontrolle}} {{PSM_Infobox}} Frequency response control '''Control of frequency response in the instrumented Charpy impact test (ICIT)''' FORCETOC ==Criteria for the fracture time== A necessary requirement for accurately determining the relationship between impact load and fracture time, or deflection, is the control of the frequency response. An exact metrological me..."

2026-09-03T12:32:20Z

Created page with "{{Language_sel|LANG=ger|ARTIKEL=Frequenzgangkontrolle}} {{PSM_Infobox}} Frequency response control '''Control of frequency response in the instrumented Charpy impact test (ICIT)''' __FORCETOC__ ==Criteria for the fracture time== A necessary requirement for accurately determining the relationship between impact load and fracture time, or deflection, is the control of the frequency response. An exact metrological me..."

New page

{{Language_sel|LANG=ger|ARTIKEL=Frequenzgangkontrolle}}
{{PSM_Infobox}}
Frequency response control

'''Control of frequency response in the instrumented Charpy impact test (ICIT)'''
__FORCETOC__

==Criteria for the fracture time==

A necessary requirement for accurately determining the relationship between impact load and fracture time, or deflection, is the control of the frequency response. An exact metrological measurement of the impact load (''F'') –time (''t'') signal is only possible if the [[ICIT – Experimental Conditions|experimental conditions]] governing the relationship between fracture time and the rise time of the electronic measurement chain are adhered to.

{|
|-
|width="20px"|
|width="500px" | <math>t_B\,>\,1{.}1\, t_R</math>
|}

with
{|
|-
|''t''R
|width="15px" |
|rise time of electronic measuring chain (amplifier and frequency filter)
|}

==Criteria for frequency filtering==

The condition for frequency filtering to occur is:

{|
|-
|width="20px"|
|width="500px" | <math>t_R\,=\,\frac{0{.}35}{f_{0{.}915}}\;; \qquad t_R\,=\,\frac{0{.}27}{f_{0{.}707}}</math>
|}

where
{|
|-
|''f''0.915dB
|width="15px" |
|frequency at which the amplitude is 90 %
|-
|''f''0.707dB
|
|frequency at which the amplitude is 70 %
|}

{|
|-
|width="20px"|
|width="500px" | <math>t_R\,=\,1{.}4\,\tau</math>
|}

{|
|-
|''τ''
|width="15px" |
|period of the characteristic inertial oscillation
|}

==Mechanical and electronic frequency filtering==

Mechanical damping elements or electronic filters are used to improve the interpretability of the ''F''–''t'' signals; filter frequencies of 3 to 10 kHz are appropriate in relation to the fracture time.

For impact-modified, [[Particle-filled Thermoplastics|filled]] and [[Fibre-reinforced Plastics|reinforced]] [[Plastics|plastics]], filtering is unsuitable in cases where the change in [[Crack Propagation Energy|crack propagation energy]] ''A''R is to be considered for deriving [[Toughness|toughness]] parameters. Filtering results in a quantitative distortion of ''A''R and thus of the [[Material Parameter|parameters]] derived from it, such as the ductility index.

==See also==

* [[Instrumented Charpy Impact Test|Instrumented Charpy impact test]]
* [[ICIT – Experimental Conditions|ICIT – Experimental conditions]]
* [[ICIT – Types of Impact Load–Deflection Diagrams |ICIT – Types of impact load–deflection diagrams ]]

==References==

* [[Grellmann,_Wolfgang|Grellmann, W.]]: Zähigkeitsbewertung mit bruchmechanischen Methoden. In: [https://www.researchgate.net/profile/Wolfgang-Grellmann Grellmann, W.], [[Seidler,_Sabine|Seidler, S.]] (Eds.): Kunststoffprüfung. Carl Hanser, Munich (2024) 4th Edition, pp. 258/259 (ISBN 978-3-446-44718-9; E-Book: ISBN 978-3-446-48105-3; see [[AMK-Library]] under A 23)
* Jungbluth, H.: Untersuchungen zum Verformungs- und Bruchverhalten von PVCC-Werkstoffen. Technische Hochschule Leuna-Merseburg (1987) (see [[AMK-Library]] unter B 1-1) ([https://www.polymerservice-merseburg.de/fileadmin/inhalte/psm/veroeffentlichungen/Jungbluth_Untersuchungen_zum_Verformungs-_und_Bruchverhalten_von_PVCC-Werkstoffen.pdf Bibliographic summary/Table of contents])

[[Category:Instrumented Impact Test]]

Frequency Response Control - Revision history