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Fatigue Crack Propagation in cylindrical bars
Author(s) -
Caspers M.,
Mattheck C.,
Munz D.
Publication year - 1986
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19860170907
Subject(s) - bar (unit) , crack closure , materials science , stress intensity factor , fracture mechanics , crack growth resistance curve , bending , tension (geology) , structural engineering , composite material , crack tip opening displacement , stress concentration , mechanics , engineering , ultimate tensile strength , physics , meteorology
Crack propagation calculations were conducted to describe a developing surface crack in a solid round bar. The theoretical basis is a stress intensity factor solution in weighted average for the center and the surface points of a so called “almond‐shaped” crack under Mode 1 loading. This solution was obtained by use of approximate weight functions. With these weight functions stress intensity factors for tension and bending were calculated. Predictions for the developing crack shape and the crack growth rate can be made utilizing a da/dN‐ΔK relation. Experimental results for a 42 CrMo4 steel are in excellent agreement with these predictions.