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Assessment of the period to fatigue macrocrack initiation near stress concentrators by means of strain parameters
A new approach to the experimental assessment of the local strain at a stress concentrator has been presented. It is based on a procedure of notch opening displacement measurements at certain points in the vicinity of a notch related to the effective notch radius rhoeff = rho + d*, where rho is the notch radius and d* is a material constant. Different stress concentrations in structural elements were modelled for a wide variation of notch radii (rho = 0.1-6.5 mm) and different geometries of specimens. Hence, a basic relationship, which directly relates the local strain range Delta epsilon* to the period of fatigue macrocrack initiation Ni has been established. Thus, by applying the value of Delta epsilon*, assessed from a direct measurement at the notch root, it is possible to determine the period Ni to initiate a fatigue macrocrack of length ai = d* for some structural components of complicated geometry.
Assessment of the period to fatigue macrocrack initiation near stress concentrators by means of strain parameters
A new approach to the experimental assessment of the local strain at a stress concentrator has been presented. It is based on a procedure of notch opening displacement measurements at certain points in the vicinity of a notch related to the effective notch radius rhoeff = rho + d*, where rho is the notch radius and d* is a material constant. Different stress concentrations in structural elements were modelled for a wide variation of notch radii (rho = 0.1-6.5 mm) and different geometries of specimens. Hence, a basic relationship, which directly relates the local strain range Delta epsilon* to the period of fatigue macrocrack initiation Ni has been established. Thus, by applying the value of Delta epsilon*, assessed from a direct measurement at the notch root, it is possible to determine the period Ni to initiate a fatigue macrocrack of length ai = d* for some structural components of complicated geometry.
Assessment of the period to fatigue macrocrack initiation near stress concentrators by means of strain parameters
Ostash, O.P. (author) / Panasyuk, V.V. (author) / Kostyk, E.M. (author)
Fatigue and Fracture of Engineering Materials and Structures ; 22 ; 687-696
1999
10 Seiten, 26 Quellen
Article (Journal)
English
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