The most common locations for fastener fatigue failure include the joint, the first loaded thread, the root fillet, the thread, and the end of the thread. Since the processing industry has improved fatigue strength by developing better materials and production methods, the thread becomes the weakest point of the fastener and is currently the highest proportion of damage in fatigue failure.
The interrelationship between the designed stress variables and the performance characteristics of the fasteners makes the setting of fatigue strength a difficult task, currently measured by the number of "cycles to break" and the relative strength of a series of fasteners. It is a complicated process.
Another cause of bolt breakage is corrosion. There are many forms of corrosion, including general corrosion, chemical corrosion, electrolytic corrosion, and stress corrosion.
Electrolytic corrosion is the first exposure of fasteners, and is eroded by various wetting agents such as rainwater or acid mist. These are electrolytes, which will cause chemical corrosion of fasteners. The materials of fasteners are different, and their electrolytic potentials are different. The potential difference is easy to produce a "micro battery." Designers should choose materials with close electrolysis potentials according to the compatibility of metals, and eliminate the conditions for electrolyte generation to prevent cracks from electrolytic corrosion.
Stress corrosion is relatively limited. Stress corrosion exists under the action of high tensile load, which mainly affects fasteners of high strength alloy steel.
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