Popularly speaking, bearing fatigue is the material under cyclic load, further degradation, resulting in the emergence of microscopic cracks, cracks further growth, until failure phenomenon. In general, bearing fatigue cracks lead to a brittle-like failure, and necking does not occur in cyclic deformation because the strain is much smaller than the material plasticity.

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Failure Analysis For Self-Lubricating Bronze Bearings

Bearing Fatigue May Lead To Bearing Failure

In all applications where a rod end is subjected to alternating loads, loads that vary in magnitude or where failure of a rod end is dangerous, make sure that the selected rod end has sufficient fatigue strength.

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What is bearings fatigue?

Self-lubricating plain bearings metal fatigue refers to the bearing material, zero component under cyclic stress or cyclic strain, in one or several places gradually produce local permanent cumulative damage, after a certain number of cycles crack or suddenly complete fracture process. when materials and structures are subjected to repeated loads, although the stress value does not exceed the strength limit of the self-lubricating bearings material, or even lower than the elastic limit, damage may occur. this phenomenon of material and structure damage under the repeated action of alternating loads is called self-lubricating plain bearing bush fatigue failure.

Classification of self-lubricating bronze bearings fatigue

The two main plain bearing fatigue classifications are high cycle self-lubricating bronze bearings fatigue (HCF) and low cycle self-lubricating bronze bearings fatigue (LCF), which are based on the failure of a high cycle crack after at least 10,000 cycles.

The main difference between the two classifications is that the generation and propagation of self-lubricating bearings fatigue cracks are different.

self-lubricating bronze bearing

For low cycle self-lubricating bronze bearings fatigue:

Cracks occur early in the oilless bearing fatigue life, roughly below 3%-10%, followed by a long period of crack development (Stephens, 2001)

Meanwhile, low cycle oilless bearing fatigue is accompanied by elastic and plastic (viscoplastic) behaviors, which can be divided into four main stages:

1) Cyclic hardening 2) Crack generation 3) Crack propagation 4) Final fracture (Hertzberg, 1996)

For high cycle self-lubricating bronze bearings fatigue:

There is a long period of crack generation

Oilless bush bearing fatigue test

Bearing fatigue experiments include stress relaxation, thermodynamic fatigue, creep – fatigue, etc.

Bearing fatigue test is defined according to R ratio, R1 = minimum strain/maximum strain; R2 = minimum stress/maximum stress.

Combinations containing metal plain bearing bush fatigue

  • The normal temperature fatigue
  • Thermal fatigue
  • Thermal-mechanical fatigue
  • Fatigue – creep
  • Fatigue – creep – damage

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Self-lubricating Bearings Failure Analysis:  

Bearing working surface failure analysis is an important step in improving bearing reliability system engineering.  Bearing loss of its specified function in the work, resulting in failure or can not work normally phenomenon is called failure: bearing failure according to its life can be divided into normal failure and early failure of two kinds.  This paper mainly analyzes the causes of early failure of bearings caused by spot corrosion and fatigue, and puts forward improvement measures to improve the service life and reliability of bearings.  ‍  

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Bearing fatigue failure is a failure of the surface form, mainly manifested as fatigue crack initiation, propagation and fracture process, under the alternating load produced by the failure of the long-term impact of the metal. 

  • On the surface, this is, imported bearing in the process of rolling contact, by the job plastic deformation and strain hardening on the surface of the contact stress on the surface of the cyclical changes caused by the effect of external load, and finally on the inner surface of the small crack from the development, the formation of surface crack between the two, because Xie into the lubricant on the surface of the work, the power of the open, crack down on the wall,  Forcing the crack forward.  
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  • From the surface layer, repeated pressure, surface contact, initially at a certain depth of the exposed surface of the place to produce pear-grain cracks, and along the surface direction of the Angle, to a certain depth, from the surface of the contact surface, and beyond the surface, and eventually formed erosion stripping, leaving a horse pit.

On the surface, or from the surface of the crack, these two goals (part carburizing, quenching and other surface heat treatment, if after have uneven hardness, organization, and the internal stress of non-uniform and other adverse, the contact stress is generally have the opposite under the influence of underground seam type, if the workpiece surface quality is poor, there is a defect (oxidation and decarburization), friction or poor lubrication, From the surface crack.

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