Deformation Velocity

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Deformation velocity

General use of the term

The term deformation velocity, sometimes also referred to as loading velocity, is used in material and polymer testing [1, 2], for a wide variety of loading types and material types, as well as in structural analysis [3, 4] for a wide variety of tests (short-term and long-term tests, impact tests and dynamic loading such as fatigue) as a synonym for deformation rate.

Synonyms in materials processing

However, this term is also of great importance in manufacturing processes, the primary forming and reshaping of metallic materials [5, 6], plastics [7, 8] and plastic films (calendering, blown film production) [8, 9], where it is closely related to the degree of elongation of the materials. In most cases, no distinction is made between whether the velocity acts uniaxially or multiaxially and whether it is the engineering or true strain rate, whereby a wide variety of units of measurement are also used here. In some cases, the term loading rate is also used to characterise the increase in force or stress per unit of time. In any case, this term should not be used as a synonym for test speed.

Without going into a more in-depth interpretation of the preceding definitions and applications, a definition that is suitable for testing and practical use is required to describe deformation rate and the related synonyms and specific terms.

See also

The following terms are also explained in more detail in the WIKI-lexicon "Polymer Testing & Diagnostics" from Polymer Service GmbH Merseburg (PSM):

• Deformation rate
• Test speed
• Strain rate

- Basics

- Applications

• Velocity
• Crosshead speed

References

[1]	Burgahn, F., Schulze, V., Vöhringer, O., Macherauch, E.: Modellierung des Einflusses von Temperatur und Verformungsgeschwindigkeit auf die Fließspannung von Ck 45 bei Temperaturen T < 0,3 Ts. Materialwissenschaft und Werkstofftechnik 27 (1996) 11 pp. 521–530
[2]	Penning, B., Walther, F., Dumke, D. Künne, B.: Einfluss der Verformungsgeschwindigkeit und des Feuchtegehaltes auf das quasistatische Verformungsverhalten technischer Vulkanfiber. Materials Testing: 55 (2013) 4, pp. 276−284.
[3]	Eyerer, P. (https://de.wikipedia.org/wiki/Peter_Eyerer), Elsner, P.( https://de.wikipedia.org/wiki/Peter_Elsner), Hirth, T. (Eds.): Domininghaus – Kunststoffe: Eigenschaften und Anwendungen. Springer, Berlin (2007), 6th Edition, (ISBN 978-3-540-26433-0)
[4]	Hertel, H.: Ermüdungsfestigkeit der Konstruktionen. Springer, Berlin (2013), (ISBN 978-3-642-51081-6)
[5]	Hornbogen, E., Warlimont, H.: Metallkunde: Aufbau und Eigenschaften der Metalle und Legierungen. Springer, Berlin, (2013), 2nd Edition, (ISBN 978-3-662-22155-6)
[6]	Schulze, G. (Eds): Werkstoffkunde. Springer, Berlin, (2013), 6th Edition, (ISBN 978-3-662-10904-5)
[7]	Determann, H.: Nichthärtbare Kunststoffe (Thermoplaste). Springer, Berlin, (2013), 6th Edition, (ISBN 978-3-642-99845-4)
[8]	Abts, G.: Kunststoff-Wissen für Einsteiger, Springer, Berlin, (2016), 3rd Edition, (ISBN 978-3-446-45104-9; see AMK-Library under G 7-1)
[9]	Nentwig, J.: Kunststoff-Folien. Carl Hanser, München, (2006), (ISBN 978-3-446-40390-1)