Introduction
Bimonthly, started in 1957
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
location: home > paper >
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Analysis of Strength Degradation of Q235 Corroded Steel Based on Pitting Evolution
DOI:
10.16355/j.tyut.1007-9432.20230047
Received:
Accepted:
| Corresponding author | Institute | |
| GUO QI | College of Civil Engineering， Taiyuan University of Technology |
abstract:
【Proposes】To evaluate the strength degradation behavior of corroded steel with pitting evolution，an in-situ pitting evolution method is achieved by ABAQUS software combined with Python program according to pit statistics on steel matrix surfaces atdifferent corrosion durations. Following this，the stochastic pitting evolution method for assessing the mechanical properties of corroded steel is proposed.【Methods】Then，on the premise of the consistent mass loss rates between the numerical model and the test，the accuracy and applicability of numerical results of corroded steel strength are analysed and verified. Also，a model of strength degradation created by corrosion pits is established. In addition，the degradation laws of yield and ultimate strengths of corroded Q235 steel under the joint influence of mass loss rate and corrosion depth are systematically investigated. Successively，the generalized equations for the evolution of yield and ultimate strengths of corroded steel with the mass loss rate and corrosion depth are proposed.【Findings】The results show that when the pit depth is known，the residual strength decreases exponentially with the increase of mass loss rate. The yield strength and ultimate strength of steel under the influence of pitting corrosion can be calculated by mass loss rate and pit depth together.
Keywords:
corroded steel； pitting evolution； residual strength； mass loss rate； stochastic numerical analysis;