introduction
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented on that committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

International standards are drafted in accordance with the rules given in Part 3 of the ISO/IEC Directive.

The draft international standard adopted by the Technical Committee will be circulated to the member bodies for voting. Publication as an international standard requires approval by at least 75% of member institutions.

Please note that some elements of this part of ISO 6603 May be the subject of a patent right. ISO is not responsible for identifying any or all such patents.

The international standard ISO 6603-2 was developed by the Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical Properties.

ISO 6603-2-2000 “Plastics – Determination of puncture impact behaviour of rigid plastics – Part 2: Instrument impact test”

The second edition cancels and replaces the first edition (ISO 6603-2:1989), which has been technically revised.

ISO 6603 consists of the following parts, under the general heading Plastics – Determination of puncture impact behaviour of rigid plastics:

– Part 1: Non-instrumental impact testing

– Part 2: Instrumented impact testing

Appendices A to E of this part of ISO 6603 are for information purposes only.

1 Range
This part of ISO 6603 specifies a test method for determining the puncture impact properties of rigid plastics in the form of flat specimens using instruments that measure force and deflection. This applies if a force-deflection or force-time plot recorded at a nominal constant firing pin speed is necessary to characterize impact behavior in detail.

ISO 6603-1 can be used if ISO 6603-1 is sufficient to characterize the impact behavior of plastics by an impact failure energy threshold based on many samples.

The purpose of this part of ISO 6603 is not to explain the mechanisms that occur at each particular point on the force-deflection chart. These explanations are the task of scientific research.

Note also Article 1 of ISO 6603-1:2000.

ISO 6603-2-2000 “Plastics – Determination of puncture impact behaviour of rigid plastics – Part 2: Instrument impact test”

2 Normative references
The following normative documents contain provisions that, by reference herein, constitute the provisions of this part of ISO 6603. For dated references, any subsequent revisions or amendments to these publications will not apply. However, Parties to agreements based on this part of ISO 6603 are encouraged to investigate the possibility of applying new versions of the following normative documents. For undated references, a new version of the standard-setting document referred to applies. ISO and IEC members maintain a register of currently valid international standards.

ISO 2602:1980, Statistical interpretation of test results – mean estimation – confidence intervals.

ISO 6603-1:2000, Plastics. Determination of puncture impact behavior of rigid plastics. Part 1: Non-instrumental impact tests.

3 Terms and definitions
For this part of ISO 6603, the following terms and definitions apply.

3.1 Impact velocity

The speed of the firing pin relative to the support at the time of impact

Note 1: The impact velocity is expressed in meters per second (m/s).

3.2 Force F

The force exerted by the firing pin on the specimen in the direction of impact

Note 1: Force is expressed in Newtons (N).

3.3 Deflection l

The relative displacement between the firing pin and the specimen holder begins with the first contact between the firing pin and the specimen

Note 1: Deflection is expressed in millimeters (mm).

3.4 Energy

The energy expended to deform and penetrate the specimen up to the deflection L

ISO 6603-2-2000 “Plastics – Determination of puncture impact behaviour of rigid plastics – Part 2: Instrument impact test”

Note 1: Energy is expressed in joules (J).

Note 2: The energy is measured as the integral of the force-deflection curve from the point of impact to the deflection l.

3.5 Maximum Power FM

The test process occurs with maximum force

Note 1: Maximum force is expressed in Newtons (N).

3.6 Deflection lm at maximum force

Deflection at maximum power FM

Note 1: Deflection under maximum force is expressed in millimetres (mm).

3.7 Energy to maximum power

The energy expended at maximum force reaches deflection lM

Note 1: The most powerful energy is expressed in joules (J).

3.8 Puncture deflection lP

The force is reduced to half the deflection of the maximum force F M

See Figures 1-4 and Note 3.9.

Note 1: Puncture deflection is expressed in millimeters (mm).

ISO 6603-2-2000 “Plastics – Determination of puncture impact behaviour of rigid plastics – Part 2: Instrument impact test”

3.9 Puncture Energy

The energy consumed until the puncture deflects lP

See Figures 1-4 and note 2.

Note 1: The puncture energy is expressed in joules (J).

Note 2: When testing hard materials, a probe mounted at a distance from the impact tip can record the friction force acting between the cylindrical part of the firing needle and the piercing material. The corresponding friction energy should not be included in the piercing energy, so the piercing energy is limited to that deflection, where the force drops to half of the maximum force FM.

3.10 Impact Failure

The mechanical properties of the material to be measured may be of one of the following types (see note) :

ISO 6603-2-2000 “Plastics – Determination of puncture impact behaviour of rigid plastics – Part 2: Instrument impact test”
Note 1: A comparison of Figures 2 and 3 shows that puncture deflection lP and puncture energy EP are the same for failure types YS and YU. As shown in Figure 4, in the case of failure type YU, the deflection and energy have the same values at the maximum and at the puncture. For complex behaviour, see annex A.

Figure 1 – An example of a force-deflection diagram of the typical appearance of a specimen after yielding (zero slope at maximum force) followed by deep drawing and testing (using lubrication)

Figure 2 – Example force-deflection diagram of failure by yield (zero slope at maximum force), followed by steady crack growth, and typical appearance of the specimen after testing (using lubrication)

Figure 3 – Example force-deflection diagram of failure through yield (zero slope at maximum force) and the typical appearance (lubrication) of the specimen after testing

Note the natural vibration of the force detector can be seen after the unstable cracking (firing pin and weighing sensor).

Figure 4 – Example force-deflection diagram of unyielding failure followed by unstable crack propagation and typical appearance of the specimen after testing (using lubrication)

ISO 6603-2-2000 “Plastics – Determination of puncture impact behaviour of rigid plastics – Part 2: Instrument impact test”

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