If a crack gets to initiate in an important steel structure ( bridge ), how can we stop it from spreading ?
A very fast (but temporary) way to stop crack propagation is to drill a hole at the crack tip. This will reduce the SIF by altering the local tip radius. Nevertheless, proper design is the only appropriate solution to avoid problems like that.
I agree with George and Christoph....
Basically you have to either remove the crack tip or somehow reduce the stress intensity in the vicinity of crack (either by reducing load in the member itself or by making a hole at crack tip)
The proposed solutions are temporary and not for long life exploitation. If the change of loads аре stochastic, it is best to immediately approach the rehabilitation of construction by replacing the section with a crack. Changing the structure of the crystal lattice is unstoppable, depends on the air temperature and humidity. In the reconstruction can be redesigned form if the concentration of the voltages is the reason for the occurrence of cracking.
Drill holes at the ends of the crack.
reduce stress on the component.Use 'metal stiching' or 'metal lock' the two sides.
For absolute efficiency: replace the component.
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