Impact resistance by the free-falling dart method – Instrumented puncture test

Impact resistance test in a drop impact tester, test speed approx. 4.4 m/s, for simulating impact-like stresses similar to the test of the drop hammer method (Dart Drop). In comparison to the Dart Drop test, the determination of the characteristic value is done electronically by means of a piezo force sensor in the drop probe as well as a light gate for deformation measurement and not by iterative variation of the impact mass (staircase method). Therefore, in addition to the damage force, results are also obtained for the deformation to fracture or the damage work. An older method according to specifications of the Fraunhofer Institute for Process Engineering and Packaging also allows testing of folded edges on premature damage.

Test Method Group: Mechanical properties

Norms:

DIN ISO 7765-2 (2009-02) Plastics film and sheeting – Determination of impact resistance by the free-falling dart method – Part 2: Instrumented puncture test
DIN 53373 (withdrawn) (1970-09) Impact penetration test combined with data recording by means of electronic devices
FhG Technical Bulletin 6 Teil 2 Blatt 2 (withdrawn) (1981-02) Sheet 2 Determination of folded edges breaking force (based on DIN 53373)

Required Sample Amount: Sample over total width of material minimum length: 0,5 m, minimum width/length = 80 mm (specimen = circle 80 mm diameter)

Standard Tests

Impact test with electronic data recording on flat materials (withoud, folded edges, etc.)

Specific Norm: DIN ISO 7765-2

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Impact test with electronic data recording on folded edges

Specific Norm: FhG Merkblatt 6 Teil 2 Blatt 2 (zurückgezogen)

The test is performed on both fold edges (left and right). The puncture is performed at a specified distance x of the folded edge from the specimen center, i.e. next to the folded edge. The value x depends on the damage deformation measured on the flat material without folded edge.

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