Fatigue Testing of Tubular Truss Joints

Fatigue testing of tubular truss joints requires simulating actual load conditions, using constant amplitude loading or variable amplitude loading methods to record the stress range, crack initiation, and propagation process of the joint. The test focuses on stress concentration areas such as weld toes and intersections, using strain gauges or crack monitoring technology to evaluate the fatigue life of the joint under cyclic loading.

Test results show that fatigue cracks in tubular truss joints often initiate at weld toes or intersections, gradually propagate with increasing loading cycles, and eventually lead to structural failure. Optimizing welding processes and reducing stress concentration can significantly improve the fatigue resistance of the joint.