Overview
ISO 5722:2023 specifies a laboratory test method for determining tensile and shear creep of ceramic adhesive in fine/advanced ceramics at ambient temperature. The standard defines specimen preparation, test fixtures and apparatus, measurement and recording procedures, creep calculations and required test reporting. It is intended for evaluating time-dependent deformation (creep strain) and creep rupture time of adhesive layers used in ceramic–ceramic, ceramic–metal and ceramic–glass joints.
Key topics and technical requirements
- Test principle: Apply a constant uniaxial tensile or shear load to a cross-bonded sample so the adhesive layer experiences uniform stress; record displacement versus time to determine creep strain and rupture time.
- Specimen geometry: Rectangular bars (recommended section 10 mm × 10 mm, length > 30 mm) joined orthogonally to form a cross-bonded sample; adhesive layer thickness shall be > 1 mm.
- Measurement accuracy: Linear dimension devices should have resolution of 0.01 mm (ISO 3611); deformation (creep) measurement resolution 0.001 mm or finer. Continuous or sufficiently frequent displacement-time recording is required.
- Apparatus and fixtures: Creep testing machine must provide uniform, constant tensile/shear loads and meet verification per ISO 7500-2. Test fixtures should be made of hard metal with high elastic modulus and hardness (as specified in the standard).
- Loading procedure and limits: Interfacial strength tests are performed first; creep load shall not exceed 80% of the measured interface strength.
- Data and calculations: Standard provides formulas and procedures to calculate applied load, tensile creep strain and shear creep strain from measured displacements, cross-bonded area and initial adhesive thickness. Record rupture (fracture) time when applicable.
- Reporting: Test reports must reference ISO 5722:2023 and include laboratory identification, test dates, specimen details, test conditions, displacement–time curves, calculated creep data and rupture times.
Applications and users
ISO 5722 is valuable for:
- Materials researchers characterizing time-dependent behavior of ceramic adhesives and interfacial layers.
- Quality control and acceptance testing in manufacturers of advanced ceramics, ceramic assemblies, and bonded components.
- Design engineers generating data for lifetime predictions and reliability assessments of ceramic joints under sustained loads.
- Test laboratories performing standardized creep testing and certification.
Keywords: ISO 5722, tensile creep, shear creep, ceramic adhesive, fine ceramics, advanced ceramics, creep testing, cross-bonded sample, creep strain.
Related standards
- ISO 13124 - Test method for interfacial bond strength of ceramic materials (specimen preparation referenced).
- ISO 7500-2 - Verification of static uniaxial testing machines (creep testing machine verification).
- ISO 3611 - Micrometers for external measurements (dimension-measuring equipment).