ISO 11003-2:2019

Overview - ISO 11003-2:2019 (Adhesives, shear behaviour, thick adherends)

ISO 11003-2:2019 specifies a tensile test method to determine the shear behaviour of structural adhesives in a single-lap joint configuration using thick, rigid adherends. The procedure produces a largely uniform shear-stress distribution across a short overlap so that adhesive shear properties - rather than peel or mixed-mode failures - are measured. Typical deliverables include the shear stress–shear strain curve to failure, shear modulus, secant modulus, and maximum shear stress. This standard does not apply when failure occurs by adhesion (adhesive/substrate separation).

Key topics and technical requirements

• Specimen configuration: flat-ended or stepped adherends (dimensions per the standard); bond thickness 0.2–0.8 mm (preferred 0.5 mm).
• Adherends: steel recommended (e.g., XC18 or E24 Grades), machined per referenced steel standards.
• Apparatus and accuracy:
  • Tensile-testing machine able to produce fracture at 10–80% of force transducer full scale.
  • Force transducer accuracy: 1% at a shear strain of 0.01.
  • Extensometer(s) for central shear displacement with 1 μm resolution; contact points within 2 mm of bonded faces. Use of two opposing extensometers is recommended to average out twisting.
  • Low-torque loading device (simple universal-joint design recommended).
  • Data logging to record load and displacement from start to fracture.
  • Micrometer and optical microscope for dimensional checks (adhesive thickness).
• Specimen preparation: bonding, surface preparation (follow ISO 17212), machining precautions (temperature limits), and at least five specimens per test condition.
• Outputs and calculations: average shear stress, shear strain, stress–strain curve, shear modulus; procedures for deriving secant modulus and maximum shear stress are defined.
• Environmental and test variables: method permits assessment of temperature, environment, and test speed effects on shear properties.

Applications and typical users

ISO 11003-2 is used for:

• Characterizing structural adhesive shear performance in R&D, material selection, and failure analysis.
• Quality control and acceptance testing by adhesive manufacturers and independent test laboratories.
• Design validation and certification in aerospace, automotive, rail, marine, construction, and composite bonding industries. Typical users: materials engineers, test lab technicians, adhesive formulators, and quality assurance teams.

Related standards

• ISO 17212 - surface preparation for adhesive bonding
• ISO 291 - conditioning and testing atmospheres
• ISO 10365 - failure pattern designation
• ISO 683-3, ISO 14737, ISO 4995 - recommended steel/adherend material provisions

Keywords: ISO 11003-2, shear behaviour, structural adhesives, single lap joint, thick adherends, shear modulus, shear stress–strain, adhesive testing, extensometer, bond thickness.