Measurement of Local Initiation, Early Growth and Retardation of Physically Short Fatigue Cracks Using Amended DCPD Method

• DOI: 10.4028/www.scientific.net/kem.586.19
• Publication Date: 2013-09-11T14:44:01Z
• Authors: Ivo Černý
• Keywords: Paris' law

Different experimental methods are being used in laboratories for automatic measurement of fatigue crack growth rates and threshold values. Such data belong to mechanical properties essential an assessment residual life components structures containing cracks length more than several millimetres. However, if the material contains small crack-like defects like inclusions or pores, knowledge about local resistance against physically short becomes very important. Damage mechanisms even complicated case a presence subsurface stress field, e.g. due technological effects. Experimental difficulties connected with investigation (FCG) can be reduced use indirect methods. The aim work described this paper was explore possibilities limits DCPD (direct current potential drop) method optimised evaluation damage process initiation early field induced by shot peening.