RESIDUAL STRAINS AND DISPLACEMENTS WITHIN THE PLASTIC ZONE AHEAD OF A CRACK.
Progress rept. no. 3,
BATTELLE MEMORIAL INST COLUMBUS OHIO
Pagination or Media Count:
Strains and displacements in the plastically yielded region generated ahead of a machined notch and a crack were detected with an interferometric technique. The measurements were performed on Fe-3Si steel sheets after unloading and reflect local yielding under plane stress conditions. The results show that notch acuity within the limits examined has little effect on the strain distribution. Measured displacements are qualitatively in accord with the theoretical expectations of the DM Dugdale-Muskhelishvili model. Quantitative agreement is not obtained and this is attributed to work hardening and the Bauschinger effect, complications that are neglected in the calculation. The work also draws attention to a parameter -- the width of the plastic zone at half maximum strain -- useful for connecting displacement with maximum strain. Author
- Marine Engineering