3 research outputs found
Thermographic Analysis of Stress Distribution in Welded Joints
The fatigue life prediction of welded joints based on S-N curves in conjunction
with nominal stresses generally is not reliable. Stress distribution in welded
area affected by geometrical inhomogeneity, irregular welded surface and weld
toe radius is quite complex, so the local (structural) stress concept is
accepted in recent papers. The aim of this paper is to determine the stress
distribution in plate type aluminum welded joints, to analyze the reliability of
TSA (Thermal Stress Analysis) in this kind of investigations, and to obtain
numerical values for stress concentration factors for practical use. Stress
distribution in aluminum butt and fillet welded joints is determined by using
the three different methods: strain gauges measurement, thermal stress analysis
and FEM. Obtained results show good agreement - the TSA mutually confirmed the
FEM model and stresses measured by strain gauges. According to obtained results,
it may be stated that TSA, as a relatively new measurement technique may in the
future become a standard tool for the experimental investigation of stress
concentration and fatigue in welded joints that can help to develop more
accurate numerical tools for fatigue life prediction