Professor of aircraft materials, Faculty of Aerospace Engineering, Delft University of Technology, Delft,
Pages: 30 Published: Jan 1988
The meaning of crack closure for fatigue crack growth resistance is discussed under different headings: (1) mechanistic aspects of crack closure—essential differences between microcracks and macrocracks, microstructural influences; (2) direct methods and indirect methods to measure crack closure; (3) numerical aspects of crack closure relations for constant-amplitude loading; and (4) crack closure and variable-amplitude loading. The paper summarizes the present state of the art. Attention is paid to microstructural aspects, changing crack growth mechanisms under threshold conditions and 3-dimensional aspects including plane strain/plane stress problems.
fatigue, crack growth, fatigue mechanism, crack closure, constant-amplitude loading, variable amplitude loading, microstructure, survey
Paper ID: STP27198S