Hollow Rivet Failure Form and explanation of failure reasons. Failure form: Fracture macro, microscopic investigation results indicate that the hollow rivet cracking characteristics of the same, the fatigue area is larger, the area of the instantaneous fault area is small, and the mechanical force interrupted after the fracture difference significantly.
The cracking form of inductive discriminant failure Hollow rivet is fatigue cracking. Failure reason: Void Hollow rivet Fracture investigation indicates that the cracking Origin area has not seen significant impurity and other metallurgical shortcomings, metallographic arrangement has not seen abnormal, hot upsetting nail data strength is weaker than cold upsetting nail head, but the cracking failure appears in the cold pier end, so the hollow rivet riveting cracking failure should be independent of raw materials. The hollow rivet fracture includes a big one and a small two remarkable fatigue cracking area. Under normal circumstances, hollow rivets are usually subjected to shear stress and should not be cracked or exhausted. From the cracks appear in the cold heading of the head bearing, and there is a circumferential conflict traces, hollow rivet rod cracking bearing there are also significant wear marks, such as the Hollow Rivet nail head drop should be fretting wear caused by fatigue cracking.
Post time: Nov-26-2020