ISO 8060:2024

Overview

ISO 8060:2024 specifies a laboratory method to characterize the durability of adhesive interfaces in bonded assemblies of carbon fibre reinforced plastics (CFRPs) and metals. The standard uses a wedge rupture test with a double cantilever beam (DCB) specimen under defined environmental conditioning to force crack propagation along CFRP/adhesive or metal/adhesive interfaces. Results are reported as a quantitative interfacial fracture energy (Gc), enabling evaluation of adhesives, primers and surface treatments for safety and reliability.

Key topics and technical requirements

• Test principle: Wedge insertion into a pre-cracked DCB specimen to generate tensile opening and controlled crack propagation along the interface.
• Specimen preparation: Bonded CFRP/metal panels (suggested panel sizes and strip cutting), use of a non-stick precrack film (<13 µm), adhesive layer thickness control (<1 mm) and limits on thickness variation (±20%).
• Apparatus & measurements:
  • Wedge: 25 mm width × 30 mm length; thickness Δ = 1–3 mm; stainless steel recommended; tip radius < 30°.
  • Tensile testing machine with displacement control (5–15 mm/min).
  • Travelling microscope and calipers/micrometres (accuracy requirements specified).
• Specimen quantity & conditioning: Minimum of five specimens; conditioning guidance for humidity and substrate drying to control moisture effects.
• Data & reporting: Measurement of crack length, beam thicknesses, adhesive thickness, and calculation of critical strain energy release rate (Gc).
• Scope limits: Intended specifically for CFRP-to-metal bonded plates; not a substitute for full field tests or application-specific specimen dimensions.

Applications and users

ISO 8060:2024 is practical for:

• Aerospace and automotive engineers assessing CFRP-to-metal bonded joints for certification and fatigue-related durability.
• Adhesive and surface-treatment manufacturers validating formulations, primers and surface preparation processes.
• Materials and test laboratories performing comparative aging studies (humidity, temperature cycles, salt mist).
• MRO (maintenance, repair and overhaul) teams evaluating repair methods and long-term joint reliability.

Use cases include qualification testing for type certification, screening adhesives and treatments for harsh environments, and supporting maintenance procedures for CFRP-metal assemblies.

Related standards

• ISO 10365 - Adhesives: designation of main failure patterns
• ISO 9142 - Guide to selection of laboratory ageing conditions for bonded joints
• ISO 178 - Plastics: determination of flexural properties
• ISO 17212 - Surface treatments for metallic substrates
• ISO 10354 - Wedge test references and related methodologies

Keywords: ISO 8060:2024, CFRP, carbon fibre reinforced plastics, wedge rupture test, DCB, adhesive durability, interfacial fracture energy, bonded assemblies, adhesive testing.