ISO 25217-2009 PDF

Full title and description

Adhesives — Determination of the mode 1 adhesive fracture energy of structural adhesive joints using double cantilever beam and tapered double cantilever beam specimens. This International Standard specifies test specimens, test procedures and data reduction methods for measuring mode I fracture energy (G_Ic) of structural adhesive joints using double cantilever beam (DCB) and tapered double cantilever beam (TDCB) geometries.

Abstract

ISO 25217:2009 defines a procedure, based on linear elastic fracture mechanics (LEFM), to determine the fracture resistance of bonded structural joints under mode I opening loads. The standard covers specimen preparation (DCB and TDCB), test execution, and recommended data-reduction equations to obtain the mode I adhesive fracture energy (G_Ic).

General information

• Status: Published; under systematic review — last reviewed and confirmed in 2020 (remains current as the 2009 edition).
• Publication date: May 2009 (Edition 1, 2009-05).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 83.180 — Adhesives.
• Edition / version: Edition 1 (2009).
• Number of pages: 24 (ISO published document).

Scope

Specifies a standardized method, using LEFM principles, to determine the mode I adhesive fracture energy of structural adhesive joints. The scope includes the DCB and TDCB specimen geometries, test arrangements for applying an opening (mode I) load, measurement and monitoring of crack growth, and recommended data-reduction procedures to calculate G_Ic for structural adhesives. It is intended for bonded assemblies where mode I opening is the relevant fracture mode.

Key topics and requirements

• Definition and use of double cantilever beam (DCB) and tapered DCB (TDCB) specimen geometries for mode I testing.
• Application of linear elastic fracture mechanics (LEFM) principles to obtain critical energy release rate (G_Ic).
• Test setup details: loading blocks or hinged tabs, measurement of load and displacement, and visual or instrumental crack-length monitoring.
• Data reduction and analysis methods (including corrected beam theory / compliance-based approaches commonly used with DCB tests).
• Specification of specimen preparation, pre-cracking, and test conditions to improve repeatability and comparability.

Typical use and users

Used by adhesive manufacturers, materials and mechanical test laboratories, research institutions, and design/engineering teams in industries such as aerospace, automotive and manufacturing where bonded structural joints are employed. Researchers also use ISO 25217 as a benchmark when developing or comparing alternative mode I fracture test methods.

Related standards

Standards for mode I fracture testing and related DCB procedures include ASTM D5528 (Mode I interlaminar fracture toughness for unidirectional fiber-reinforced composites) and ISO 15024 (mode I interlaminar fracture toughness for fibre‑reinforced plastic composites); industry-specific test methods and national adoptions (for example SS‑ISO 25217:2011) may also exist. These documents cover similar DCB/TDCB geometries and complementary data-reduction methods but are tailored to different materials or sectors.

Keywords

Mode I; G_Ic; fracture energy; double cantilever beam (DCB); tapered DCB (TDCB); linear elastic fracture mechanics (LEFM); adhesive joints; data reduction; corrected beam theory; compliance methods.

FAQ

Q: What is this standard?

A: ISO 25217:2009 is an International Standard that specifies test procedures to determine the mode I adhesive fracture energy (G_Ic) of structural adhesive joints using double cantilever beam (DCB) and tapered DCB specimens.

Q: What does it cover?

A: It covers specimen geometries (DCB and TDCB), specimen preparation and pre-cracking, test fixtures and measurement (load, displacement, crack length), and recommended data-reduction procedures based on LEFM to calculate the critical energy release rate for mode I opening.

Q: Who typically uses it?

A: Adhesive producers, independent and in-house materials test labs, research groups studying fracture of bonded joints, and engineers in sectors that rely on structural bonding (for example aerospace and automotive) use this standard for qualification, comparison and research.

Q: Is it current or superseded?

A: The 2009 edition (Edition 1) was published in May 2009 and was last reviewed and confirmed by ISO in 2020; the ISO record indicates this version remains current. Users should check with their national body or ISO for any later amendments or replacements.

Q: Is it part of a series?

A: It is part of the body of international standards dealing with fracture testing and properties of adhesives and bonded joints. Related ISO standards and sector-specific methods (for composites or industry practice) cover complementary DCB-based mode I tests (for example ISO 15024 and ASTM D5528).

Q: What are the key keywords?

A: Mode I, G_Ic, fracture energy, DCB, TDCB, LEFM, adhesive joints, data reduction, corrected beam theory, compliance calibration.