According to requirement of factory and experiment,U-shaped loading method was used to analyze the seat underframe and get the deflection and stress of test point on the front longeron.

However,a sharp crack can hardly be prepared for the specimen of quasi-brittle materials,alternatively it is reasonable to consider a U-shaped notch,then use stress concentration factor(SCF) to characterize the peak stress at the notch bottom.

A modified dual-band microstrip patch antenna with a U-slot and loaded with double shorted posts;

Arbitrary Lagrangian-Eulerian method is used to study large sloshing of water in large scale U-shaped aqueduct, and to discuss the vibration responses of aqueduct structure with different water levels under sinusoidal loads and earthquake action.