ANTUNES, F. V. [et al.] (2015) - Effect of compressive loads on plasticity induced crack closure. Theoretical and Applied Fracture Mechanics. ISSN 0167-8442. Vol. 80, p. 193-204 Doi: 10.1016/j.tafmec.2015.09.001
0167-8442
Title
Effect of compressive loads on plasticity induced crack closure
Compressive stresses play an important role on tension-compression fatigue which can be attributed to plasticity induced crack
closure (PICC). The objective here is to study numerically the effect of compressive stresses on PICC and to discuss the
applicability of PICC to explain the effect of negative stress ratios on fatigue crack growth rate. The compression produces
reversed plastic deformation at the crack tip, reducing linearly the crack opening level. The incursion to negative stress ratios
did not produce sudden changes in the behavior of PICC and no saturation with the decrease of minimum load was observed
for δKeff. Crack closure was able to collapse da/dN-δK curves with negative stress ratios, indicating the applicability of the
crack closure concept to explain the effect of negative R. The analysis of crack tip plastic strain range with and without contact
of crack flanks confirmed the validity of crack closure concept. info:eu-repo/semantics/publishedVersion
