EN ISO 179-2:2020 PDF
Plastics - Determination of Charpy impact properties - Part 2: Instrumented impact test (ISO 179-2:2020)
Plastics - Determination of Charpy impact properties - Part 2: Instrumented impact test (ISO 179-2:2020)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 30
- Дата публикации:
- 3 июня 2020 г.
- Издание:
- CEN EN 179 edition 2 version 1
- ICS:
- 83.080.01
1.1 This document specifies a method for determining Charpy impact properties of plastics from force-deflection diagrams. Different types of rod-shaped test specimens and test configurations, as well as test parameters depending on the type of material, the type of test specimen and the type of notch, are defined in ISO 179-1. Dynamic effects such as load-cell/striker resonance, test specimen resonance and initial-contact/inertia peaks are described in this document (see Figure 1, Curve b, and Annex A). 1.2 ISO 179-1 is suitable for characterizing the impact behaviour by the impact strength only and for using apparatus whose potential energy is matched approximately to the particular energy to break to be measured (see ISO 13802:2015, Annex E). This document is used to record a force-deflection or force-time diagram for detailed characterization of the impact behaviour, and for developing automatic apparatus, i.e. avoiding the need to match energy. The method described in this document is also suitable for: — acquiring more and different materials characteristics under impact conditions; — supervising the Charpy test procedure, as this instrumentation allows detection of typical operational mistakes, such as the specimen not being in close contact with the supports; — automatically detecting the type of break; — pendulum type instruments to avoid frequent changes of pendulum hammers; — measuring fracture mechanical properties described in other ISO standards. 1.3 For the range of materials which can be tested by this method, see ISO 179-1:2010, Clause 1. 1.4 For the general comparability of test results, see ISO 179-1:2010, Clause 1. 1.5 Information on the typical behaviour of materials can be obtained by testing at different temperatures, by varying the notch radius and/or specimen thickness and by testing specimens prepared under different conditions. It is not the purpose of this document to give an interpretation of the mechanism occurring at every point on the force-deflection diagram. These interpretations are a task for on-going scientific research. 1.6 The test results obtained with this method are comparable only if the conditions of test specimen preparation, as well as the test conditions, are the same. The impact behaviour of finished products cannot, therefore, be predicted directly from this test.
Abstract
Overview
EN ISO 179-2:2020 - Plastics - Determination of Charpy impact properties - Part 2: Instrumented impact test (ISO 179-2:2020) specifies a method to determine Charpy impact behaviour of plastics by recording force‑deflection or force‑time diagrams. Unlike the non‑instrumented Charpy test (ISO 179‑1), this instrumented method captures dynamic data for detailed characterization of impact response, enabling automatic apparatus and broader material characterization without needing to match pendulum energy to the expected break energy.
Key topics and technical requirements
- Scope and purpose: Measurement of Charpy impact properties from instrumented data; applicability follows ISO 179‑1 material and specimen types.
- Instrumentation and apparatus: Requirements for pendulum and falling‑mass instruments, load cells and data acquisition to record force–deflection/time traces. Force calibration and test speed determination (including for falling mass instruments) are specified.
- Dynamic effects: Treatment and description of dynamic artefacts such as load‑cell/striker resonance, specimen resonance, and the inertial peak (first peak in force trace) - see Figure 1 and Annex A.
- Specimens and configurations: Rod‑shaped specimens and notched/unnotched configurations defined by reference to ISO 179‑1.
- Calculations and results: Procedures for calculating deflection, impact energy, impact strength (notched and unnotched), statistical parameters, and rules on significant figures.
- Precision and reporting: Precision data, test report content requirements and guidance (Annex C and test report clause).
- Normative references: ISO 179‑1:2010, ISO 13802:2015 (verification of pendulum machines), ISO 291, ISO 16012, ISO 2602.
Applications and who uses it
EN ISO 179-2:2020 is intended for:
- Materials engineers and R&D teams characterizing toughness, fracture behaviour and transition phenomena under impact loading.
- Independent testing laboratories and quality control for production plastics where instrumented impact traces add diagnostic value.
- Instrument manufacturers developing automated pendulum/falling‑mass systems that record force‑time/force‑deflection data.
- Failure analysts and researchers using detailed curves to detect sampling or operational mistakes (e.g., poor specimen seating) and to automatically classify break type. Practical uses include material selection, comparative toughness studies at different temperatures or specimen geometries, and supporting fracture mechanics testing referenced by other ISO standards.
Related standards
- ISO 179‑1:2010 - Charpy non‑instrumented impact test (specimen types and general comparability).
- ISO 13802:2015 - Verification of pendulum impact‑testing machines.
- Other referenced documents: ISO 291, ISO 16012, ISO 2602.
Keywords: EN ISO 179-2:2020, Charpy impact, instrumented impact test, force‑deflection diagram, plastics impact properties, inertial peak, ISO 179-1.
Технические детали
- Технический комитет
- CEN/TC 249 - Plastics
- SKU
- EN ISO 179-2:2020
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