Evaluation of the structures metal damage under the static and cyclic loadings according to the coersive force value https://doi.org/10.33108/visnyk_tntu2018.01.019
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Abstract
The results of experimental investigations of the damage degree of the ferromagnetic steel 05kp and austenitic (paramagnetic in the initial state) steel АISI 304 under the static and cyclic loading according to the coercive force (Нс) value are presented. The stages of the processes of the damage accumulation are determined: the growth of the coercive force values corresponds to the elastic-plastic strain ( crack initiation stage ), and the decrease of their values is caused by the failure of the metal solidity caused by the formation of pores
and cracks ( crack development stage ). Identification of the damage accumulation stages by changing the direction of the coercive force kinetics after a certain number of run cycles allows us to construct a curve of
irreversible damage ( the French line type ) and to evaluate the cyclic durability not according to the fatigue curve (destruction) of the metal, as it is considered in engineering, but at the stage of the crack initiation, which significantly reduces the risk of destruction. The obtained results can be the basis for the development of new approaches to the rapid assessment of the residual life of the structures metal by a simple non-destructive method.
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