Trapezoidal Specimen

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Trapezoidal specimen

For the determination of the tear propagation resistance in the tear propagation test, trapezoidal test specimens according to DIN 53363 as well as specimens in the form as strip-, angle- and arc-shaped test specimens to according to ISO 34-1 are used for films. Within the scope of the “Lexicon Polymer Testing”, the term " specimen" with geometric dimensions similar to those of a component is used uniformly in connection with mechanical and fracture-mechanical materials testing, whereas “sample”, “test piece” or “probe” with the smallest dimensions are predominantly analysed in polymer analytics. The trapezoidal test specimen is provided with a deep cut, which causes a high notch effect, or high stress concentration (see fracture mechanics) and initiates the tear propagation process under tensile load.

Fig.:

Trapezoidal specimen according to DIN 53363

Grellmann, W., Seidler, S. (Eds.): Polymer Testing. Carl Hanser Munich, 3rd. Edition (2022 ) p. 124 (ISBN 978-1-56990-806-8; e-book 978-1-56990-807-5; see AMK-Library under A 22)
ISO 34-1 (2022-06): Rubber, Vulcanized or Thermoplastic – Determination of Tear Strength – Part 1: Trouser, Angle and Crescent Test pieces
DIN 53363 (2003-10): Testing of Plastic Films – Tear Test using Trapezoidal Test Specimen with Incision (withdrawn; replaced by DIN EN 17679: 2022-08)
DIN EN 17679 (2022-08): Plastics – Plastic Films – Determination of Tear Resistance using a Trapezoidal Test Specimen with Incision

Trapezoidal specimen

See also