SIST EN 2746:2001

• Abstract:

  This standard specifies the three point bend method for the determination of the flexural properties of glass fibre reinforced plastics for aerospace applications.

• Status: Published
• Publication Date: 31-May-2001
• ICS: 49.025.40 - Rubber and plastics
• 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 2746:1998 - Aerospace series - Glass fibre reinforced plastics - Flexural test - Three point bend method

• Refers: SIST EN 2374:2001 - Aerospace series - Glass fibre reinforced mouldings and sandwich composites - Production of test panels
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2743:2004 - Aerospace series - Fibre reinforced plastics - Standard procedures for conditioning prior to testing unaged materials
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2489:2001 - Aerospace series - Fibre reinforced plastics - Determination of the action of test fluids
• Effective Date: 28-Jan-2026

Overview

SIST EN 2746:2001 is a key European standard published by CEN for the aerospace sector, titled “Aerospace series - Glass fibre reinforced plastics - Flexural test - Three point bend method.” This standard prescribes the three point bend test for determining the flexural properties of glass fibre reinforced plastics (GFRP) used in aerospace applications. By providing a consistent methodology, EN 2746 helps ensure reliability, safety, and performance of plastic composites under flexural loading-a critical requirement in aerospace engineering.

Key Topics

• Glass Fibre Reinforced Plastics (GFRP): The standard focuses specifically on materials reinforced with glass fibres, widely used for high strength-to-weight ratios in aerospace structures.
• Three Point Bend Method: It details the use of a three point bend configuration to assess flexural strength and modulus. This procedure measures the ability of composite specimens to resist deformation under load.
• Flexural Properties: EN 2746 specifies how to determine flexural strength, flexural modulus, and strain-to-failure, which are vital indicators of material behavior under bending stresses.
• Standardized Testing Conditions: Consistent sample preparation, loading rates, and test environments are established to ensure reproducibility and comparability of results.
• Aerospace Applications: The rigorous requirements reflect the demanding conditions GFRP materials are subjected to in aircraft, spacecraft, and related aerospace components.

Applications

SIST EN 2746:2001 is widely used by:

• Aerospace Manufacturers: To qualify and certify glass fibre reinforced plastic materials for new designs, ensuring compliance with regulatory and performance standards.
• Component and Parts Suppliers: For developing and validating GFRP components used in airframes, interiors, and structural elements where flexural performance is critical.
• Quality Assurance Laboratories: As a reference method for routine testing and quality control of incoming or in-service GFRP materials.
• R&D and Engineering Teams: To benchmark and develop advanced composite materials, ensuring new formulations meet the necessary flexural properties.
• Regulatory and Certification Bodies: When assessing the airworthiness and suitability of composite materials for aerospace use.

By adhering to EN 2746, organizations can demonstrate material reliability, meet international aerospace quality requirements, and reduce the risk of material failure.

Related Standards

• EN ISO 14125: Reinforced plastics - Determination of flexural properties, offering alternative or complementary methods for flexural testing.
• EN 2562: Aerospace series - Carbon fibre reinforced plastics - Unidirectional laminates - Tensile test.
• ISO 527: Plastics - Determination of tensile properties, often used in conjunction with flexural property standards.
• EN 2823: Aerospace series - Fibre reinforced plastics - Determination of apparent interlaminar shear strength.

These related standards support a comprehensive approach to mechanical testing and material verification in the aerospace sector.

Keywords: SIST EN 2746:2001, glass fibre reinforced plastics, aerospace standards, three point bend test, flexural properties, composite material testing, GFRP, CEN, material qualification, aerospace composites.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Glass fibre reinforced plastics - Flexural test - Three point bend methodLuft- und Raumfahrt - Glasfaserverstärkte Kunststoffe - Biegeversuch - DreipunktverfahrenSérie aérospatiale - Plastiques renforcés au verre textile - Essai de flexion - Méthode des trois pannesAerospace series - Glass fibre
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