The present paper provides experimental estimation equation based on the load-crack opening displacement (COD) record for testing the circumferential through-wall cracked pipe under combined tension and bending. Based on the limit analysis and the kinematically admissible rigid-body rotation field, the plastic -factor for the load-COD record is derived and is compared with that for the load-load line displacement record. Comparison with the results from detailed elastic-plastic finite element analysis shows that the proposed method based on the load-COD record provides reliable estimates even for shallow cracks (small crack angle), whereas the conventional approach based on the load-load line displacement record gives erroneous results for shallow cracks. Thus, the proposed estimation method could be recommended for testing the circumferential through-wall cracked pipe, particularly with shallow cracks.
Issue Section:
Materials and Fabrication
Keywords:
bending,
crack detection,
integral equations,
pipes,
circumferential through-wall cracked pipe,
combined tension and bending,
crack opening displacement,
J testing,
plastic η-factor
Topics:
Displacement,
Finite element analysis,
Fracture (Materials),
Pipes,
Stress,
Tension,
Testing
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