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Created page with "{{Language_sel|LANG=ger|ARTIKEL=Druckfestigkeit}} {{PSM_Infobox}} Compressive strength __FORCETOC__ ==Definition of compressive strength== The compressive strength ''σ''M or ''σ''cM is determined in a compression test on rigid and semi-rigid plastics, i.e. thermoplastic injection moulding and extrusion materials, [[Fibre-reinforced Plastics|fibre-reinforced]..."

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{{Language_sel|LANG=ger|ARTIKEL=Druckfestigkeit}}
{{PSM_Infobox}}
Compressive strength
__FORCETOC__

==Definition of compressive strength==

The compressive strength ''σ''M or ''σ''cM is determined in a [[Compression Test|compression test]] on rigid and semi-rigid [[Plastics|plastics]], i.e. thermoplastic injection moulding and extrusion materials, [[Fibre-reinforced Plastics|fibre-reinforced]] [[Moulding Compound|moulding compounds]], and unreinforced and reinforced [[Thermosets|thermosetting]] plastics in accordance with DIN EN ISO 604 [1]. By definition, compressive strength is the maximum compressive stress that the test [[Specimen|specimen]] can withstand during a [[Compression Test|compression test]]. The compressive strength is calculated according to '''Eq. (1)''' at the absolute maximum force in the test, whereby ''A''0 is used instead of ''A'' in the standard for the initial cross-sectional area.

{|
|-
|width="20px"|
|width="500px" | <math>\sigma _{m}\ = \frac{F_{m}}{A_{0}} = \frac{F_{max}}{A_{0}}</math>
|width="50px" |(1)
|}

==Compressive stress-strain curves of plastics==

'''Figure 1''' shows a schematic compressive stress-strain curve from which the typical [[Measured Variable|measured variables]] can be derived.

[[File:Druckfest_1.jpg]]
{|
|- valign="top"
|width="50px"|'''Fig. 1''':
|width="600px" |Typical compressive stress-strain curves for [[Plastics|plastics]] in [[Compression Test|compression testing]] according to [1]
|}

The relative maximum force in curve a of '''Figure 1''' is referred to as the pressure yield stress ''σ''y. The deformation value associated with compressive strength is the nominal compression at compressive strength ''ε''cM, which is derived from '''Eq. (2)'''.

{|
|-
|width="20px"|
|width="500px" | <math>\varepsilon _{cM}\ = \frac{\Delta L_{cM}}{L}</math>
|width="50px" |(2)
|}

''L'' is the initial distance between the pressure plates (see [[Compression Test Arrangement|compression test arrangement]]).

==Typical compressive strength values for plastics==

A comprehensive literature analysis of the [[Material Value|mechanical characteristics]] ''σ''M and ''σ''y, determined in [[Compression Test|compression tests]], is compiled for numerous [[Plastics|plastics]] in [2].

==See also==

* [[Compression Test Arrangement|Compression test arrangement]]
* [[Compression Test|Compression test]]
* [[Compression Test Compliance|Compression test compliance]]
* [[Strength]]
* [[Creep Compression Test|Creep compression test]]
* [[Compression after Impact Test|Compression after impact test]]

==References==

{|
|-valign="top"
|[1]
|ISO 604 (2002-03): Plastics – Determination of Compressive Properties
|-valign="top"
|[2]
|[[Bierögel,_Christian|Bierögel, C.]], [[Grellmann,_Wolfgang|Grellmann, W.]]: Compression loading. In: [https://www.researchgate.net/profile/Wolfgang-Grellmann Grellmann, W.], [[Seidler,_Sabine|Seidler, S.]]: Mechanical and Thermomechanical Properties of Polymers. Landolt-Börnstein. Volume VIII/6A3, Springer, Berlin (2014) 150–163, (ISBN 978-3-642-55165-9; siehe [[AMK-Library]] under A 16)
|}

[[Category:Compression Test]]

Compressive Strength - Revision history