ISO 15653 Metallic Materials, Test Method Test Method for Determination of Semi-Static Fracture Toughness of Welds

Metal Test Laboratory

ISO 15653 Metallic Materials, Test Method Test Method for Determination of Semi-Static Fracture Toughness of Welds

EUROLAB laboratory provides testing and compliance services within the scope of ISO 15653 standard. ISO 15653 specifies methods for determining fracture toughness in terms of the stress intensity factor (K), crack tip opening displacement or CTOD (δ), and the experimental equivalent of the J integral (J) for welds in metallic materials.

ISO 15653 Metallic Materials, Test Method Test Method for Determination of Semi-Static Fracture Toughness of Welds

ISO 15653 supplements ISO 12135, which covers all aspects of base metal fracture toughness testing and should be used with this document. This standard describes methods for determining point values ​​of fracture toughness.

It should not be considered as a way to obtain a valid R-curve (resistance-to-crack-strain curve). However, the sample preparation methods described in this standard can be usefully used when determining R.

The methods use fatigue pre-cracked specimens that are notched after welding at a specific target area in the weld. Methods are described to evaluate the suitability of a weld for notching in the weld metal or within the target area within the weld heat affected zone (HAZ) and then evaluate the efficiency of fatigue when appropriate.

The specimen geometry and notch orientation are selected, and then a fatigue crack is extended from the notch tip of the specimen to the target weld feature or microstructure by applying a controlled alternating force to the specimen.

The purpose of the test is to determine weld fracture toughness in the absence of significant residual weld stresses. To achieve this and produce a flat pre-fatigue crack, modifications to the fatigue pre-cracking procedure may be required. These modifications are often required when testing welded or partially stress relieved welds.

EUROLAB assists manufacturers with ISO 15653 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.

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