Fatigue control of ferromagnetic materials by non-destructive magnetic method

Контроль втоми феромагнітних матеріалів неруйнівним магнітним методомKeywords
Energy and Energy Efficiency Mechanical engineering Instrument

Monitoring of fatigue state of ferromagnetic steel and iron products and designs using the method of measuring the coercive force is proposed. Primary area of method using - stress concentration zones in which the operational fatigue develops and accumulates with advancing paces. The location of these zones on many products is well known, since it is logically predetermined by the design of a controlled product.
The currently available results of practical using of coercive force method tend to focus on low-cycle fatigue, as well as the using of steel with significant ductility in an initial condition. For these conditions the value of the coercive force changes during metal loading in a few times, and that provides a high resolution of the method with the ability to reliably determine the residual life of products.
In addition, there is a need to determine of a possibility of correct application of coercive force method for the analysis of a structural condition of steel, hardened by heat treatment and other methods , as well as working in high-cycle fatigue.

Innovative aspect and main advantages:
The coercive force is one of the few structure-sensitive properties, which varies significantly over the period of metal "life". The main advantages of the method - its high sensitivity, no need for special surface preparation of controlled metal, it may be significant roughness and curvature, there is no dependence on temperature control environment, control is possible through the paint layer with thickness of 3 mm. The main advantages of the method - the possibility of a qualitative and quantitative assessment of metal state with definition of the residual metal life, simplicity and low cost of its realization, high efficiency and reliability.

Problem solved:
Often the character of products loading is that at which metal with extreme fatigue does not contains the defects detected by the methods (in particular flaw detection). Diagnostic evaluation of the current state of metal in construction and equipment components should be based on comprehensive data on fatigue, stress-strain state and defects in metal and should be estimate a resource on a condition of a product, instead of on its service life. Coercimetry allows methodically quickly, easily and reliably to detect and evaluate the quality and quantity of stress-strain and fatigue states.

Development status:
Development complete with proven results

Potential customers, markets:
Enterprise energy machine building