ISO 899-2:2024 PDF

Plastics — Determination of creep behaviour — Part 2: Flexural creep by three-point loading

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Title (English):

ISO 899-2:2024

Plastics — Determination of creep behaviour — Part 2: Flexural creep by three-point loading

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 16
Publication date:: October 8, 2024
Edition:: ISO IS 899 edition 3 version 1
ICS:: 83.080.01

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Description (English):

This document specifies a method for determining the flexural creep of plastics in the form of standard test specimens under specified conditions such as those of pre-treatment, temperature and humidity. It is only applicable to a simple freely supported beam loaded at mid-span (three-point-loading test). The method is suitable for use with rigid and semi-rigid non-reinforced, filled and fibre-reinforced plastics materials (see ISO 472 for definitions) test specimens moulded directly or machined from sheets or moulded articles. NOTE The method can be unsuitable for certain fibre-reinforced materials due to differences in fibre orientation The method is intended to provide data for engineering-design, quality control, research and development purposes. The method might not be applicable for determining the flexural creep of rigid cellular plastics (attention is drawn in this respect to ISO 1209-1 and ISO 1209-2).

Technical details

Technical committee: ISO/TC 61/SC 2 - Mechanical behavior
SKU: ISO 899-2:2024

Abstract

Overview - ISO 899-2:2024 (Flexural creep by three-point loading)

ISO 899-2:2024 specifies a standardized method to determine the flexural creep behaviour of plastics using a simple three-point loading (mid-span loaded, freely supported beam) test. The standard applies to rigid and semi-rigid non-reinforced, filled and fibre‑reinforced plastics (test specimens moulded or machined), under defined pre‑treatment, temperature and humidity conditions. It is intended to provide reliable data for engineering design, quality control, and research & development.

Key technical topics and requirements

Test geometry and scope
- Three‑point loading on a freely supported beam; span typically (16 ± 1) times specimen thickness for normal specimens (special spans for unidirectional fibre‑reinforced specimens).
- Specimen shape and dimensions aligned with relevant material standards and ISO 178 guidance.
Apparatus and measurement
- Test rack with adjustable supports and specified loading/support radii (see Table 1 in the standard).
- Loading system that applies load smoothly and maintains it to within ±1 %.
- Deflection‑measuring device conforming to Class 1 of ISO 9513 (contact or contactless) to avoid influencing specimen behaviour.
- Time‑measurement accuracy 0.1 %; micrometer resolution 0.01 mm; vernier calipers accurate to 0.1 % of span.
Procedure essentials
- Conditioning and controlled test atmosphere per standard (temperature and relative humidity).
- Defined steps for preloading, loading, and a deflection‑measurement schedule.
- Optional measurement of recovery rate after unloading.
- Data calculation methods for flexural‑creep modulus (Et), flexural‑creep compliance (Dt), flexural stress, flexural‑creep strain, time to rupture, and creep‑strength limit.
Results and reporting
- Presentation formats include creep curves, creep‑modulus/time curves, isochronous stress‑strain plots, 3‑D representations, and creep‑to‑rupture curves.
- Precision, test report content and annex on physical‑ageing effects are included.

Practical applications and users

Materials and polymer testing laboratories performing creep testing for plastics.
Product designers and structural engineers using long‑term mechanical property data for engineering design and component life prediction.
Quality‑control teams assessing batch consistency and production compliance.
R&D groups investigating material formulations, fibre orientation effects, and time‑dependent behaviour.
Note: the method can be unsuitable for some fibre‑reinforced materials (due to fibre orientation) and certain rigid cellular plastics - see ISO 1209‑1/2.

Related standards (for cross‑reference)

ISO 178 - Determination of flexural properties
ISO 291 - Standard atmospheres for conditioning and testing
ISO 472 - Plastics vocabulary (definitions)
ISO 9513 - Extensometer calibration (Class 1)
ISO 16012 - Determination of linear specimen dimensions
ISO 1209‑1 / ISO 1209‑2 - Considerations for rigid cellular plastics

Keywords: ISO 899-2, flexural creep, three-point loading, plastics creep behaviour, flexural‑creep modulus, creep testing, engineering design, quality control, R&D.

Related standards

Standards mentioned in the description

Abstract

Overview - ISO 899-2:2024 (Flexural creep by three-point loading)

Key technical topics and requirements

Test geometry and scope
- Three‑point loading on a freely supported beam; span typically (16 ± 1) times specimen thickness for normal specimens (special spans for unidirectional fibre‑reinforced specimens).
- Specimen shape and dimensions aligned with relevant material standards and ISO 178 guidance.
Apparatus and measurement
- Test rack with adjustable supports and specified loading/support radii (see Table 1 in the standard).
- Loading system that applies load smoothly and maintains it to within ±1 %.
- Deflection‑measuring device conforming to Class 1 of ISO 9513 (contact or contactless) to avoid influencing specimen behaviour.
- Time‑measurement accuracy 0.1 %; micrometer resolution 0.01 mm; vernier calipers accurate to 0.1 % of span.
Procedure essentials
- Conditioning and controlled test atmosphere per standard (temperature and relative humidity).
- Defined steps for preloading, loading, and a deflection‑measurement schedule.
- Optional measurement of recovery rate after unloading.
- Data calculation methods for flexural‑creep modulus (Et), flexural‑creep compliance (Dt), flexural stress, flexural‑creep strain, time to rupture, and creep‑strength limit.
Results and reporting
- Presentation formats include creep curves, creep‑modulus/time curves, isochronous stress‑strain plots, 3‑D representations, and creep‑to‑rupture curves.
- Precision, test report content and annex on physical‑ageing effects are included.

Practical applications and users

Materials and polymer testing laboratories performing creep testing for plastics.
Product designers and structural engineers using long‑term mechanical property data for engineering design and component life prediction.
Quality‑control teams assessing batch consistency and production compliance.
R&D groups investigating material formulations, fibre orientation effects, and time‑dependent behaviour.
Note: the method can be unsuitable for some fibre‑reinforced materials (due to fibre orientation) and certain rigid cellular plastics - see ISO 1209‑1/2.

Related standards (for cross‑reference)

ISO 178 - Determination of flexural properties
ISO 291 - Standard atmospheres for conditioning and testing
ISO 472 - Plastics vocabulary (definitions)
ISO 9513 - Extensometer calibration (Class 1)
ISO 16012 - Determination of linear specimen dimensions
ISO 1209‑1 / ISO 1209‑2 - Considerations for rigid cellular plastics

Keywords: ISO 899-2, flexural creep, three-point loading, plastics creep behaviour, flexural‑creep modulus, creep testing, engineering design, quality control, R&D.

ISO 899-2:2024 PDF

Technical details

Abstract

Overview - ISO 899-2:2024 (Flexural creep by three-point loading)

Key technical topics and requirements

Practical applications and users

Related standards (for cross‑reference)

Related standards

Abstract

Overview - ISO 899-2:2024 (Flexural creep by three-point loading)

Key technical topics and requirements

Practical applications and users

Related standards (for cross‑reference)

Related standards

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