Mechanical parts (or components) are designed with a traditional strength of the material yield strength of 0.02 to determine the allowable stress. That is generally considered bearing parts (or components) to work in the allowable stress is safe and reliable, neither plastic deformation, not broken.
    But the reality is not always true, and some high-strength steel rolling bearing parts (or components) and in the manufacture of large-scale low-strength steel parts, often far below the yield stress at work when brittle fracture strength. The yield strength in the following referred to as low-stress brittle fracture brittle. Pressure vessel explosion and bridges, ships, large rollers, generator rotor snapped and other accidents are often a low-stress brittle fracture. Fracture analysis showed that a large number of cases, low-stress brittle fracture is determined by the material caused macroscopic crack propagation.
    This macro-crack in the actual material will often be unavoidable, it may be in the smelting and processing of materials produced, the parts may be generated during use. Therefore, the crack is easy to expand, whether the material is easy to become an important indicator of fracture. In fracture mechanics built on the basis of the material to resist crack propagation performance, called the fracture toughness.
    Rolling bearing parts can fracture toughness allowable working stress and crack size for quantitative calculations, it is in the security design of great significance.



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