Strength and deformability of corroded steel plates under quasi-static tensile load |
| |
Authors: | Md Mobesher Ahmmad Y Sumi |
| |
Institution: | (1) Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;(2) Faculty of Engineering, Systems Design for Ocean-Space, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan; |
| |
Abstract: | The objective of this study was to estimate the strength and deformability of corroded steel plates under quasi-static uniaxial
tension. In order to accurately simulate this problem, we first estimated the true stress–strain relationship of a flat steel
plate by introducing a vision sensor system to the deformation measurements in tensile tests. The measured true stress–stain
relationship was then applied to a series of nonlinear implicit three-dimensional finite element analyses using commercial
code LS-DYNA. The strength and deformability of steel plates with various pit sizes, degrees of pitting intensity, and general
corrosion were estimated both experimentally and numerically. The failure strain in relation to the finite element mesh size
used in the analyses was clarified. Two different steels having yield ratios of 0.657 and 0.841 were prepared to examine the
material effects on corrosion damage. The strength and deformability did not show a clear dependence on the yield ratios of
the present two materials, whereas a clear dependence was shown with respect to the surface configuration such as the minimum
cross-sectional area of the specimens, the maximum depth of the pit cusp from the mean corrosion diminution level, and pitting
patterns. Empirical formulae for the reduction of deformability and the reduction of energy absorption of pitted plates were
proposed which may be useful in strength assessment when examining the structural integrity of aged corroded structures. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|