What is ISO/TR 12998 about?
ISO/TR 12998 species recommendations for test specimens and procedures for performing constant load amplitude fatigue tests on single- and multi-joint sheet specimens in the thickness range from 0,5 mm to 6 mm at room temperature and a relative humidity of max. 80 %.
ISO/TR 12998 covers:
- Testing of joints to evaluate materials
- Evaluation of the influence of joint type and joint size on the test results
- Evaluation of the influence of load type and load mode on the test results
- Testing of component-like specimens to evaluate their structural performance
Note: ISO/TR 12998 does not apply to civil engineering applications such as metal building and steel construction which are covered by other applicable standards.
Who is ISO/TR 12998 for?
ISO/TR 12998 on mechanical joining is applicable to:
- Ship, yacht, and boat building industry
- Train construction
- Aerospace manufacturers
- Automotive manufacturers
- Air-conditioning and ventilation sector
- Renewable energies (Wind turbines and solar power plants)
- Steel and plant construction 
Why should you use ISO/TR 12998?
With time and due to repeated usage, joints lose their strength. To ensure they are still safe to use and to make repairs in damaged joints, a fatigue test is required.
ISO/TR 12998 helps you with the selection of materials and thickness combinations for structures and components subjected to cyclic loading. The findings of fatigue testing are useful for direct application to a design of mechanical joining when the loading conditions in service and the stiffness of the design in the joint area are identical.
ISO/TR 12998 specifies recommendations for fatigue testing of test specimens with dimensional information for riveted, clinched, and screwed mechanical joints. Specimens of the H-shaped, hat-shaped, double-disc, and KS 2 types are specified. ISO/TR 12998 is based on ISO 18592, the standard on the fatigue testing of resistance spot welds. ISO/TR 12998 guidelines improve the reliability of constant load amplitude fatigue tests on mechanical joining.
