L. Clapham et al., THE APPLICATION OF NEUTRON-DIFFRACTION TO STRESS MAPPING AROUND A BLIND-HOLE DEFECT IN STRESSED PIPELINE STEEL, Journal of strain analysis for engineering design, 29(4), 1994, pp. 317-323
Neutron diffraction was used to map the local stress variation surroun
ding a 13 mm diameter blind-hole defect in a section of pipeline subje
cted to an applied bending stress. Comparison was made between the exp
erimentally measured results and local stress predictions based on a t
wo-dimensional analytical model as well as on three-dimensional finite
element calculations. The two-dimensional analytical model proved to
be unsatisfactory, predicting very large local stress variations at th
e defect edge which were not observed experimentally. Conversely, the
three-dimensional model reflected all of the significant trends observ
ed experimentally, although predicted stress levels were lower than th
e measured values due to limitations with the finite element package.