Oluschinski: Created page with "{{Language_sel|LANG=ger|ARTIKEL=Geschwindigkeit}} {{PSM_Infobox}} Velocity FORCETOC ==General information== The term velocity (or synonym also speed) is one of the most frequently used terms in scientific and technical literature. In materials testing and plastics testing and the related literature on testing technology, there is an inconsistent and sometimes not clearly defined variety of terms used to describ..."

2025-12-08T07:37:58Z

Created page with "{{Language_sel|LANG=ger|ARTIKEL=Geschwindigkeit}} {{PSM_Infobox}} <span style="font-size:1.2em;font-weight:bold;">Velocity</span> __FORCETOC__ ==General information== The term velocity (or synonym also speed) is one of the most frequently used terms in scientific and technical literature. In materials testing and plastics testing and the related literature on testing technology, there is an inconsistent and sometimes not clearly defined variety of terms used to describ..."

New page

{{Language_sel|LANG=ger|ARTIKEL=Geschwindigkeit}}
{{PSM_Infobox}}
<span style="font-size:1.2em;font-weight:bold;">Velocity</span>
__FORCETOC__

==General information==

The term velocity (or synonym also speed) is one of the most frequently used terms in scientific and technical literature. In materials testing and plastics testing and the related literature on testing technology, there is an inconsistent and sometimes not clearly defined variety of terms used to describe the velocity of experimental tests. The terms are often used without further definition and sometimes with contradictory units of measurement for different test methods.

==Mechanical polymer testing==

The following terms are explained in more detail in the [http://192.168.81.5/wiki/index.php/file:Deckblatt_Kunststoffpruefung.jpg WIKI-Lexicon of Polymer Testing and Diagnostics] for the field of mechanical polymer testing:

# Deformation rate
# Deformation speed
# [[Test Speed | Test speed]]
# Strain speed or strain rate
#* Basic principles
#* Applications
# [[Crosshead Speed | Crosshead speed]]

In addition, the terms not explained separately
* Pendulum hammer velocity
* Impact velocity

are frequently used.

Terms related to manufacturing technology are also not explained separately, such as

* the twisting speed
or
* the take-off speed (pull-off speed),

which are used in the plastics industry and textile technology in the production of fibres, threads, films and sheets and have a significant influence on the mechanical properties. The term pull-off speed is also used synonymously in the literature for [[Crosshead Speed | crosshead speed]].

==Fracture mechanical testing==

In the [[Fracture Mechanical Testing | fracture mechanics testing]] of [[Plastics | plastics]] and in the testing of composite materials, the following terms are also used
* [[Crack Tip Opening Displacement Concept (CTOD) | Crack opening displacement velocity]]
* Crack velocity (see crack propagation) and
* Crack propagation velocity (see, among other things, [[Fracture Mechanical Testing | fracture mechanical testing]], fracture types, fatigue crack propagation elastomers and crack propagation stress corrosion cracking).

==Non-destructive polymer testing==

In non-destructive polymer testing, the speed of propagation of different types of waves is used to interpret acoustic phenomena, see e.g. refraction of sound waves or ultrasonic birefringence.

The term ultrasound velocity is also used relatively frequently in the literature, e.g. when explaining the terms acoustic properties, modulus of elasticity ultrasonic measurements, air ultrasound, [[Crack Propagation | crack propagation]], ultrasonic birefringence, transmission of sound waves or [[Ultrasonic Weld Inspection | ultrasonic weld inspection]].

The [[Ultrasonic Runtime Measurement | ultrasound velocity]] is usually specified as the phase velocity. If wave packets with different frequencies occur due to the generation of sound, the wave packets contain waves with different wavelengths. The so-called group velocity is then specified as the average propagation speed of the ultrasound.

==See also==

* [[Test Speed | Test speed]]
* [[Crosshead Speed | Crosshead speed]]
* [[Fracture Mechanical Testing | Fracture mechanical testing]]

'''References'''

* [[Grellmann,_Wolfgang|Grellmann, W.]], [[Seidler,_Sabine|Seidler, S.]] (Eds.): Polymer Testing Carl Hanser Munich (2022) 3rd. Edition, (ISBN 978-1-56990-806-8; E-Book ISBN 978-156990-807-5; see AMK-Library under A 22)

[[Category:Velocity]]

Velocity - Revision history