Physicochemical and Vibration Analysis of Christmas Tree Four-Way Flange Failure under Fracturing Process

Figure 5

Stress cloud diagrams of bolts at different frequencies: (a) 1200 Hz; (b) 552 Hz; (c) 40 Hz; (d) 240 Hz; (e) 688 Hz; (f) 1104 Hz.

(a)

(b)

(c)

(d)

(e)

(f)