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F [kN]
t [s]
First
Second
Third
Figure 6.14: First three modes of oscillations Figure 6.15: The function of the compulsive force
[
m]
[kN/cm
2
]
Amplitudes
Stress
Figure 6.16. Response on the left shackle of one row
The smaller stress amplitude curve corresponds to the upper row of shackles.
[
m]
[kN/cm
2
]
Amplitudes
Stress
Figure 6.17. Response on the right shackle of one row
The influence of the compulsive force is reported for the right shackle of the chain.
The lover row of the shackles is carrying impulsive force.
6.2. Experimental results and repair
Several strain gauges had been applied to measure the dynamic stresses on the frame
and palette in the experimental testing (Fig. 6.18), and the clearly expressed neck
followed by final fracture was found on the shackle (Fig. 6.19). Test was performed