Residual Strength and Fatigue Lifetime of ... - Solid Mechanics
Residual Strength and Fatigue Lifetime of ... - Solid Mechanics Residual Strength and Fatigue Lifetime of ... - Solid Mechanics
the case of uneven debond growth, the generated side forces will be taken by the cylinder and transferred to the steel columns instead of the actuator. This will produce friction forces, which will make the load measurements inaccurate if the load cell is connected to the top of the actuator piston. To avoid this inaccuracy, a 25 kN load cell was connected to the bottom of the actuator piston as shown in Figure 5.35. Figure 5.35: Test setup. Figure 5.36: Actuator protection setup. 116 Force DIC cameras 25 kN Load cell
Steel plates and clamps Figure 5.37: Centre of the debond connected to the actuator using a bolt. Figure 5.38: Schematic presentation of the connection between the debonded face sheet and actuator. To determine the maximum static carrying capacity of the panels, static tests were performed on two panels. Ramp displacement controlled loading with a piston displacement rate of 1 mm/min was applied in both tests. Figure 5.39 shows the axial piston displacement vs. load curves from the static tests. It is seen that the load increases in a linear manner until the crack propagation. As the crack propagates, the load drops due to the displacement controlled loading. 117 Centre of the debond
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Steel plates <strong>and</strong> clamps<br />
Figure 5.37: Centre <strong>of</strong> the debond connected to the actuator using a bolt.<br />
Figure 5.38: Schematic presentation <strong>of</strong> the connection between the debonded face sheet <strong>and</strong><br />
actuator.<br />
To determine the maximum static carrying capacity <strong>of</strong> the panels, static tests were performed on<br />
two panels. Ramp displacement controlled loading with a piston displacement rate <strong>of</strong> 1 mm/min<br />
was applied in both tests. Figure 5.39 shows the axial piston displacement vs. load curves from<br />
the static tests. It is seen that the load increases in a linear manner until the crack propagation. As<br />
the crack propagates, the load drops due to the displacement controlled loading.<br />
117<br />
Centre <strong>of</strong> the debond
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