Analysis of u-bolt breakage In the process of using u-bolt, breakage sometimes occurs. There are three main types of u-bolt breaks. The following is a series of Tianxiang Xiaobian: Dongguan HengTaichang Doors Co, Ltd. , https://www.dghtcdoor.com
1. Normal fracture: The macroscopic shape of the u-bolt fracture has fibrous streaks diverging from the root region of the thread, and the stripes are curved in an arc shape. It shows that this phenomenon belongs to the torsion overload and is the normal fracture caused by the torsional stress.
Cause of breakage: The torque may be too large during use.
2. Plastic fracture: If the fracture part of the u-bolt is obviously stretched or shrunk, the fracture is uneven, and this phenomenon is a normal plastic fracture.
Cause of fracture: Plasticity is a property in which a material undergoes permanent deformation under a given load without causing cracking. The microstructure is characterized by permanent displacement of adjacent parts. When the material is stressed, the stress can continue to deform after the stress exceeds the yield point, instead of breaking. At this time, even if the external force is removed, some of the deformation cannot be recovered. This part of the residual permanent deformation is called plastic deformation.
3, brittle fracture: the fracture is flush and bright, and perpendicular to the normal stress.
Cause: Some microcracks are inevitably generated inside the material during various manufacturing processes such as cold extrusion and heat treatment, and it has not been found in the no-damage test. In addition, during the use, the crack will further expand due to stress concentration, fatigue, corrosion and the like. When the crack size reaches a critical size, an accident of low stress brittle fracture occurs. It is worth mentioning that brittle fracture generally occurs on high strength or low ductility, low toughness metals and alloys.
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