Test specimen

This article deals with the body to be tested or the body used for testing in terms of materials testing and measurement technology. For test mass or test charge in terms of physics, see force field .

Test specimen for tensile compression torsion testing of composite materials made of synthetic fibers

Test specimens or test specimens are used in test and measurement procedures , either as test items or as test equipment :

• In materials testing , specimens are specially manufactured and shaped material samples ; insofar they are the subject of the examination.
• Objects are also referred to as test specimens which - without being the test object themselves - are introduced into the systems to be tested. Here they have the function of a test device .

If the properties of test specimens are described in the relevant DIN , EN or other standards , we speak of standard test specimens . There are companies that specialize in selling a wide variety of test specimens.

Test specimen in materials testing

" Segerkegel " for determining the fire resistance

In materials testing , specimens are objects made from the material to be tested with precisely defined properties such as shape, size or material composition. They are exposed to defined mechanical, thermal or chemical loads in special test devices (e.g. the universal testing machine ) in order to determine the material properties and certain material parameters.

Examples:

• In the shear test a round rod, in be Charpy impact test , a one-sided notched pin and the examination of fire resistance, a cone-shaped sample of material ( " Seger cone ") is used as specimen.
• Tensile test DIN 50125 for the tensile test

Test specimen as test equipment

Test specimens for testing measuring devices

For testing measuring devices (e.g. during calibration ), test specimens with precisely defined measurable properties ( measured values ) are used as reference.

Test specimen for testing X-ray diagnostic equipment

Test specimens with precisely defined measurable properties ( measured values ) are used as reference objects for testing and adjusting medical X-ray diagnostic equipment. Such test specimens consist of material with defined radiation attenuation properties and they contain predefined imaging structures that are suitable for ensuring the image quality. In order to produce an X-ray image, the test body is positioned as an X-ray phantom in the X-ray diagnostic device instead of the patient . Based on its known object properties, the quality of the structures shown is determined in the X-ray image.

Standard test body in toilet development

right: standard test body for the function test of toilet flushing, left: four "orderly" inserted standard test body before the flushing attempt.
Figure after

In the functional test of toilet flushes carried out in accordance with DIN 1385 and EN 997, artificially reproduced "fecal sausages" are used as test specimens as a substitute for real human faeces . These standard test bodies are not available for sale, but must be made by the tester himself from synthetic casing and other materials.

See also: DIN EN 997 - toilet bowl with molded odor trap

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1. ↑ M. London: Test body for quality assurance in X-ray diagnostics. Pp. 5-14. Röntgenpraxis 43 (1990)
2. ↑ F.-P. Schmickler: Drainage technology in transition - 4.5 liter toilet flush. University of Applied Sciences Münster, 2001, p. 23. ( web.archive.org ( Memento from October 16, 2005 in the Internet Archive ))

Web links

Test specimen in material testing:

• Test specimen for the flexural tensile test on wood

Test specimens for testing measuring devices:

• Micro test body for the assessment of measuring systems for micro components (Physikalisch-Technische Bundesanstalt)

Test specimens for testing X-ray diagnostic equipment:

• X-ray phantom from the manufacturer PTW Freiburg.Accessed 29 February 2016