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Dürr, André
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document
Fatigue tests on tubular joints with different load ratios to quantify the mean stress effect
Abstract
In the verification of fatigue-loaded tubular structures the welded connection becomes mostly decisive due to the low fatigue strength of tubular joints. High residual stresses are generated in the component as a result of the welding process. If no stress-relief heat treatment has been carried out, the mean stress effect is not to be considered in the IIW-guideline or EN 1993-1-9. Preliminary fatigue tests on X-joints made of high-strength austenitic steel that were not subjected to thermal stress relief showed a significant mean stress effect that is underestimated by said standards. Further tests on rail clamps subjected to compressive stress ranges showed a highly increased fatigue strength compared the normative detail category. To develop a solid database to safely and economically consider the mean stress effect in fatigue loaded tubular connections that were not subjected to thermal stress relief, the research project FOSTA P1603 is carried out by the University of Applied Sciences Munich. Therefore, fatigue tests on X-joints with up to 4 different load ratios are carried out. The test results will be then numerically interpreted to develop a design recommendation for the nominal and notch stress concept. In this paper the test series, the test setup and previous results of fatigue tests will be presented.