Dp. Boothman et al., A SHALLOW CRACK ASSESSMENT SCHEME FOR GENERALIZED MATERIAL BEHAVIOR IN BENDING, Engineering fracture mechanics, 57(5), 1997, pp. 493-506
An engineering J-integral estimation procedure has been developed from
data generated using finite element computations. The study has been
focused on shallow edge cracked geometries with crack depths up to 10%
of the specimen depth and subjected to severe localised plastic defor
mation under pure bending loading. The material behaviour considered i
s of a generalised nature-one that consists of a perfectly plastic pla
teau preceding the work hardening region, which is represented by powe
r law. J-estimation equations were developed from curve-fitting a larg
e number of J versus remote strain curves obtained from finite element
analyses. The Validity of the proposed scheme was confirmed by compar
ison with finite element solutions on specimens with fictitious and re
al material curves. The current work, together with a previously prese
nted scheme for tension loading, hence provides a comprehensive treatm
ent of defect assessment of shallow cracked geometries under severe lo
calised plastic deformation. (C) 1997 Elsevier Science Ltd.