What Are The Causes of Single-point Suspension Damage?

What are the causes of single-point suspension damage?

1. Brittle fracture and ductile fracture

When a part is subjected to an external load, elastic deformation occurs first. When the stress caused by the load exceeds the elastic limit and continues to increase, the part undergoes plastic deformation. When the stress exceeds the strength limit, the semi-trailer axle breaks. This fracture is called toughness Fracture. The fracture surface of ductile fracture has obvious plastic deformation, the color is relatively gray, and sometimes obvious fibers can be seen.

2. Residual stress

When the trailer axle part is subjected to an external load, stress will be generated inside it, namely normal stress and shear stress. When the external force is removed, the stress remaining inside the part is called residual stress. Residual stress will cause brittle fracture of the part and additional plasticity. Deformation. This situation is particularly likely to occur in castings such as cylinder blocks and transmission housings. It will not only occur during casting, but also during use.

3. Stress concentration

If there are geometric discontinuities on the parts due to material defects, the actual stress near these parts will be much higher than the nominal stress, suppressing stress concentration. Cracks are prone to occur at stress concentration points, which cannot be ignored in the observation and analysis of part fractures. the elements of.

4. Fatigue fracture

According to the nature of the load endured by the part, fracture can be divided into one-time loading fracture and repeated loading fracture. Parts that break once loading break under one static load or one impact load; repeated loading fracture, also called fatigue fracture, is a semi- The trailer axle parts break after repeated stress or load.