论文信息 - THE EFFECT OF GEOMETRY ON THE DEVELOPMENT OF CREEP SINGULAR FIELDS FOR DEFECTS UNDER STEP‐LOAD CONTROLLED LOADING

THE EFFECT OF GEOMETRY ON THE DEVELOPMENT OF CREEP SINGULAR FIELDS FOR DEFECTS UNDER STEP‐LOAD CONTROLLED LOADING

Abstract— The development of singular fields for defects in steadily loaded creeping structures is examined as a function of geometry and crack size using finite-element analyses and results from the literature. Approximations for estimating the time-development of the amplitude of the fields are examined and it is shown that simple approximations are expected to apply for a wide range of geometries. It is shown both theoretically and numerically that plasticity on initial loading produces crack tip fields closer to the steady state condition than those produced elastically.

Robert A. Ainsworth | J. Joch

[1] T. K. Hellen,et al. Comparisons of fracture parameter evaluations for power law hardening creep , 1993 .

[2] R. A. Ainsworth,et al. Background to and validation of CEGB report R/H/R6—Revision 3 , 1988 .

[3] CRACK TIP FIELDS UNDER NON-STEADY CREEP CONDITIONS—II. ESTIMATES OF ASSOCIATED CRACK GROWTH , 1990 .

[4] Robert A. Ainsworth,et al. The assessment of defects in structures of strain hardening material , 1984 .

[5] R. A. Ainsworth,et al. Consistency of numerical results for power-law hardening materials and the accuracy of the reference stress approximation for J , 1989 .

[6] Robert A. Ainsworth,et al. CRACK TIP FIELDS UNDER NON‐STEADY CREEP CONDITIONS—I. ESTIMATES OF THE AMPLITUDE OF THE FIELDS , 1990 .

[7] Robert A. Ainsworth,et al. Some observations on creep crack growth , 1982 .

[8] T. K. Hellen. Virtual crack extension methods for non‐linear materials , 1989 .

[9] G. G. Chell,et al. CEGB ASSESSMENT PROCEDURE FOR DEFECTS IN PLANT OPERATING IN THE CREEP RANGE , 1987 .

[10] Robert A. Ainsworth,et al. Assessment of the integrity of structures containing defects , 1987 .

[11] Kumar,et al. Engineering approach for elastic-plastic fracture analysis , 1981 .