Oluschinski: Created page with "{{Language_sel|LANG=ger|ARTIKEL=Prüfkörpereinspannung}} {{PSM_Infobox}} Specimen clamping FORCETOC ==Force- and form-fitting specimen clamping== In the quasi-static tensile test, the test specimen is clamped at opposite ends in the corresponding test specimen holders of the material testing machine or suspended in a form-fitting manner (see '''Figure'''). The Sp..."

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Created page with "{{Language_sel|LANG=ger|ARTIKEL=Prüfkörpereinspannung}} {{PSM_Infobox}} <span style="font-size:1.2em;font-weight:bold;">Specimen clamping</span> __FORCETOC__ ==Force- and form-fitting specimen clamping== In the quasi-static tensile test, the test specimen is clamped at opposite ends in the corresponding test specimen holders of the material testing machine or suspended in a form-fitting manner (see '''Figure'''). The Sp..."

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

==Force- and form-fitting specimen clamping==

In the quasi-static [[Tensile Test|tensile test]], the test specimen is clamped at opposite ends in the corresponding test specimen holders of the [[Material Testing Machine|material testing machine]] or suspended in a form-fitting manner (see '''Figure'''). The [[Specimen|test specimen]] must be adjusted so that an axial force is applied in the load line of the testing machine (see: [[Load Framework|load framework]]) and bending stresses are avoided.

[[File:Specimen Clamping Figure.jpg|600px]]
{|
|- valign="top"
|width="50px"|'''Figure''':
|width="600px" |Test specimen clamps for tensile stress with (a) tensile test specimens with shoulder heads as form-fitting clamps and (b) force-fitting clamps
|}

The test specimen is loaded with a steadily increasing, impact-free force, usually until a [[Fracture|fracture]] occurs.

==Requirements for specimen holders==

The specimen grips for [[Tensile Test|tensile tests]] must cover a wide range of applications. The specimen grips form the mechanical connection between the [[Specimen|specimen]] and the [[Material Testing Machine|material testing machine]]. Their task is to initiate the movement of the traverse or piston into the [[Specimen|specimen]] and to transfer the test force generated to the force transducer located on the [[Load Framework|load framework]]. Modern clamping jaws can also be equipped with pneumatic or hydraulic elements to vary the horizontal holding force.

The specimen grips for [[Tensile Test|tensile tests]] must ensure the following:

* Axial [[Stress|stressing]] of the [[Specimen|specimen]]
* Bending stresses must be avoided
* The test [[Specimen|specimen]] must be held in place without slipping until a [[Fracture|fracture]] occurs
* Fracture of the test [[Specimen|specimen]] in the area where the force is applied must be avoided
* The test force must be distributed evenly across the cross-section and transmitted over the entire test length
* Test specimen replacement must be as simple and quick as possible

==See also==

* [[Tensile Test Compliance#Influence of test specimen clamping|Tensile test compliance, Influence of test specimen clamping]]
* [[MMB-Specimen|MMB-specimen]]
* [[Relaxation Plastics|Relaxation plastics]]
* [[Viscoelastic Material Behaviour|Viscoelastic material behaviour]]
* [[Material Testing Machine|Material testing machine]]

==References==

* Dripke, M., Michalzik, G., Bloching, H., Fahrenholz, H.: Mechanische Prüfverfahren und Kenngrößen – kompakt und verständlich, Volume 1: Der Zugversuch bei quasistatischer Beanspruchung. Castell Verlag GmbH, Wuppertal (2002), pp. 58/59 (ISBN 3-934255-50-7; see [[AMK-Library]] under C 14)

[[Category:Specimen]]
[[Category:Tensile Test]]

Specimen Clamping - Revision history