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Abstract: Fatigue strength of aluminum 5083 welded joint with
longitudinal fillet welded gusset by TIG is studied, hot spot stress is
computed by the FEM and measured by strain gauges, the test data is
statistical treated with the method recommended by IIW, the nominal
stress S-N curves and the hot spot stress S-N curves are obtained
respectively. The test analysis shows that the fitted slope of test data
to nominal stress and hot spot stress S-N curves for aluminum 5083
welded joint with longitudinal fillet welded gusset is 5.62, higher than
3.0 recommended by IIW. The fatigue limit tested for nominal stress and
hot spot stress is 54.0 MPa and 64.8 MPa respectively. There is greater
safety factor in welded structures design if 3.0 applied. Moreover, it
is safer to design aluminum alloy welded joint with longitudinal fillet
welded gusset with the nominal stress FAT28 and the hot spot stress
FAT40.
Key words: Aluminum alloy Nominal stress Hot spot stress
CLC No: TG405
国家博士点基金资助项目(1999005605).
Received 20041018, received in revised form 20050330
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