Main Failure Forms and Failure Analysis of Mechanical Parts

DALIAN, China - Dec. 18, 2022 - PRLog -- Failure Forms Of Mechanical Parts Mainly Include:

1. Overall Fracture

When a part is subjected to external loads such as tension, compression, bending, shear and torsion, the fracture occurs because the stress on a dangerous section exceeds the strength limit of the part, or the fatigue fracture occurs on the dangerous section when the part is subjected to variable stress. For example, the fracture of bolt and the fracture of gear tooth root.

2. Excessive Residual Deformation

If the stress acting on the part exceeds the yield limit of the material, the part will produce residual deformation. Excessive residual deformation of clamping positioning parts on the machine tool should reduce the machining accuracy. The residual deflection deformation of high-speed rotor shaft will increase the unbalance and further cause the deformation of parts.

3. Surface Damage Of Parts

The surface damage of parts is mainly corrosion, wear and contact fatigue. Corrosion is an electrochemical or chemical corrosion phenomenon that occurs on the metal surface. The result of corrosion is that the metal surface is rusted, thus the part surface is damaged. At the same time, corrosion fatigue will also be caused for parts subject to variable stress.

Wear is the loss or transfer of surface materials during the relative movement of two contact surfaces.

Corrosion, wear and contact fatigue are all failure forms that occur gradually with the extension of working time. The metal parts in humid air or in contact with water, steam and other corrosive media may be corroded. The contact surface of all parts in relative motion may be worn. However, contact fatigue may also occur on the surface of parts working under the condition of contact variable stress.

4. Failure caused by breaking normal working conditions

The Whoe Post at https://www.sansmachining.com/main-failure-forms-and-fail...