SIST EN 2155-12:2001

Aerospace series - Test methods for transparent materials for aircraft glazing - Part 12: Determination of linear thermal expansion

This standard specifies the method to determine the reversible linear thermal expansion of plastics with exclusion of changes in length due to accidental factors such as changes in moisture content, degree of polymerization and stressrelease. Since it will not be possible to exclude all these accidental factors, the method can be expected to give only approximate values.

Luft- und Raumfahrt - Prüfverfahren für transparente Werkstoffe zur Verglasung von Luftfahrzeugen - Teil 12: Bestimmung der linearen Wärmeausdehnung

Diese Norm beschreibt das Verfahren zur Bestimmung der umkehrbaren linearen Wärmeausdehnung von Kunststoffen mit Ausschluss der Längenänderungen infolge zufälliger Umstände, wie z.B. Änderungen des Feuchtigkeitsgehalts, Polymerisationsgrades und Entspannungsvorgängen. Da es nicht möglich ist, alle zufälligen Umstände außuschließen, kann man von dem Verfahren nur Annäherungswerte erwarten.

Série aérospatiale - Méthodes d'essais pour matériaux transparents pour vitrages aéronautiques - Partie 12: Détermination de la dilatation thermique linéaire

La présente norme spécifie la méthode pour déterminer la dilatation thermique linéaire réversible des plastiques en excluant des changements de longueur dus à des facteurs accidentels tels que changements de la teneur en humidité degré de polymérisation et relâchement de contraintes. Lorsqu'il n'est pas possible d'exclure tous ces facteurs accidentels, la méthode peut être considérée comme donnant seulement des valeurs approximatives.

Aerospace series - Test methods for transparent materials for aircraft glazing - Part 12: Determination of linear thermal expansion

General Information

• Status: Published
• Publication Date: 31-May-2001
• ICS: 49.045 - Structure and structure elements
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jun-2001
• Due Date: 01-Jun-2001
• Completion Date: 01-Jun-2001
• Ref Project: EN 2155-12:1997 - Aerospace series - Test methods for transparent materials for aircraft glazing - Part 12: Determination of linear thermal expansion

Overview

SIST EN 2155-12:2001 is a CEN standard belonging to the Aerospace series that defines a test method for determining the linear thermal expansion of transparent plastics used in aircraft glazing. This part 12 of the series focuses specifically on measuring reversible changes in length caused by temperature variations. The method aims to exclude dimensional changes due to accidental factors such as moisture content, polymerization degree, or stress release. However, the standard acknowledges that complete exclusion of these factors is not feasible, so results provide approximate values.

This standard is essential for aerospace manufacturers, material scientists, and testing laboratories involved in the quality control and development of glazing materials for aircraft windows, canopies, and other transparent components requiring dimensional stability under temperature fluctuations.

Key Topics

• Scope of Measurement: Determines reversible linear thermal expansion in plastics used for aircraft glazing.
• Factors Controlled: Attempts to minimize measurement errors caused by moisture changes, polymerization degree variances, and stress release.
• Approximate Results: Emphasizes that measured expansions are approximate due to uncontrollable incidental factors.
• Material Focus: Applies specifically to transparent materials such as acrylics, polycarbonates, and other plastics used in aerospace glazing applications.

Applications

• Aircraft Glazing Design: Engineers use this standard to evaluate how transparent glazing materials will behave dimensionally when exposed to temperature changes in flight conditions.
• Quality Assurance Testing: Aerospace suppliers and testing laboratories apply the method to verify material conformity with thermal expansion requirements.
• Material Development: Helps researchers characterize new transparent plastic materials for improved thermal stability in aerospace environments.
• Maintenance and Inspection: Enables assessment of glazing components for deformation risks during aircraft operation and exposure to temperature cycles.

Related Standards

• EN 2155 Series: Other parts of the EN 2155 series cover additional test methods for transparent aerospace materials, including mechanical, optical, and environmental testing.
• ISO 11359: International standard on testing methods for thermal expansion of plastics, complementing EN 2155-12 for broader material analysis.
• ASTM D696: Standard test method for linear thermal expansion of plastics in the US, serving as a reference for comparative test methods.
• Aerospace Material Specifications (AMS): AMS standards related to aircraft transparent plastics often reference thermal expansion properties to ensure material suitability.

Summary

SIST EN 2155-12:2001 provides a standardized method for determining the linear thermal expansion of transparent aerospace plastics, supporting design accuracy and safety in aircraft glazing applications. Its practical approach to mitigating accidental measurement influences ensures reliable, approximate data critical for material selection and quality control in the aviation industry. Stakeholders benefit from this standard by ensuring the dimensional stability of glazing materials, thereby enhancing the durability and performance of aircraft transparent components under varying thermal conditions.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Test methods for transparent materials for aircraft glazing - Part 12: Determination of linear thermal expansionLuft- und Raumfahrt - Prüfverfahren für transparente Werkstoffe zur Verglasung von Luftfahrzeugen - Teil 12: Bestimmung der linearen WärmeausdehnungSérie aérospatiale - Méthodes d'essais pour matériaux transparents pour vitrages aéronautiques - Partie 12: Détermination de la dilatatio
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