caa a22 4500 467949905 CHVBK 20180322200725.0 cr unu---uuuuu 170328e19861001xx s 000 0 eng 10.1007/BF02403009 doi (NATIONALLICENCE)springer-10.1007/BF02403009 (NATIONALLICENCE)springer-10.1007/BF00553807 Plastic deformation — its role in fatigue crack propagation [Elektronische Daten] [P. Mazumdar, S. Jeelani] Recognizing the fact that the effective driving force (ΔK eff) determines the fatigue crack propagation (FCP) rate and that the shear strain, which is considered to develop due to an occurrence of crack closure, primarily contributes to the plastic deformation, an effort is made here to elucidate the role of plastic deformation in FCP by developing a correlation between the ΔK eff and the applied driving force (ΔK) with shear strain as variable. The effect of the degree of plastic deformation (i.e. shear strain level) on the FCP rates at higher values of ΔK, where ΔK eff approaches ΔK, approaching the Paris regime, appears minimal. On the other hand, the disparity between ΔK eff and ΔK, which apparently increases with shear strain level, persists at lower values of ΔK. This suggests a strong influence of the degree of localized deformation on the FCP rates in the near threshold level. Hence, an improvement of FCP rates in the near threshold level should follow an effort that promotes the plastic deformation near the crack tip to a greater degree. This approach could, therefore, form the basis to explain the effect of the grain size, microstructure, environment,R-ratio and crack size on the near-threshold FCP rates. Chapman and Hall Ltd, 1986 Mazumdar P. School of Engineering and Architecture, Tuskegee University, 36088, Tuskegee, Alabama, USA aut Jeelani S. School of Engineering and Architecture, Tuskegee University, 36088, Tuskegee, Alabama, USA aut Journal of Materials Science Kluwer Academic Publishers 21/10(1986-10-01), 3611-3614 0022-2461 21:10<3611 1986 21 10853 https://doi.org/10.1007/BF02403009 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02403009 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mazumdar P. School of Engineering and Architecture, Tuskegee University, 36088, Tuskegee, Alabama, USA aut NATIONALLICENCE 700 1- Jeelani S. School of Engineering and Architecture, Tuskegee University, 36088, Tuskegee, Alabama, USA aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers 21/10(1986-10-01), 3611-3614 0022-2461 21:10<3611 1986 21 10853 NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00553807 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer