ANISOTROPIC EFFECT ON DUCTILE CRACK GROWTH OF PRESSURIZED PIPES UNDER FULLY BENDING MOMENT Conference Paper uri icon

abstract

  • Abstract One of the common assumptions done in Engineering Critical Assessment (ECA) procedures and standard design codes to assess criticality of initial defects is that the metallic material is isotropic and its plastic flow can be well represented by the von Mises yield function for large plastic deformations. This is due to the coupons used for material characterization are usually extracted from the pipe section along a specific orientation (transverse or longitudinal), and thus the material is deemed as isotropic. This factor may limit tremendously the applicability of the ECA for a more general loading case scenario, where the criticality of the initial crack would be required. In this exploratory study, a X65 seam weld pipeline steel is investigated by considering the effect of anisotropy on plasticity and fracture responses of biaxially loaded pipes having different crack lengths, diameter sizes and internal hydrostatic pressures. The results indicate that anisotropic effects become significant in thin-walled pipes than in thicker configurations regardless initial crack size and internal pressure due to the heavy wall-thickness.

name of conference

  • Volume 6: Materials and Fabrication

published proceedings

  • PROCEEDINGS OF THE ASME 2020 PRESSURE VESSELS & PIPING CONFERENCE (PVP2020), VOL 6

author list (cited authors)

  • Sakonder, C., & Paredes, M.

complete list of authors

  • Sakonder, Cuneyt||Paredes, Marcelo

publication date

  • August 2020