Abstract
This study proposes an assessment method for 16 mm-thick Q355B steel notched plates (SNPs) assessing fatigue life. The method divides the total fatigue life calculation into two phases, i.e., the fatigue crack initiation (FCI) life and the fatigue crack propagation (FCP) life. Using fatigue tests on five groups (60 specimens), this study investigated the influence of stress amplitude and nominal maximum stress on fatigue life. Based on the tests data and the FCI life model, a formula for calculating the FCI life of Q355B-16 mm SNPs was derived. Additionally, using the tests and theoretical calculation data and the FCP life calculation model, a formula for predicting the FCP life of Q355B-16 mm SNPs was established. Consequently, the total fatigue life of Q355B-16 mm SNPs was then obtained by summing up FCI life and FCP life. Based on the fatigue test data, the accuracy of a fatigue life calculation method proposed in this paper, which considers the crack initiation phase, was verified. The results indicate that this method demonstrates higher precision compared to the calculation method that does not account for the crack initiation life, as well as the fatigue life calculation method recommended by the current China's code (GB50017–2017). Moreover, the errors are −2.1 % to +19.3 %, −44.5 % to +18.1 %, and −52 % to +98.4 %, respectively.
| Original language | English |
|---|---|
| Article number | 136972 |
| Journal | Construction and Building Materials |
| Volume | 437 |
| DOIs | |
| Publication status | Published - 26 Jul 2024 |
Keywords
- Ellipsoidal fracture model
- Fatigue crack
- Fatigue test
- Initiation life
- Propagation life
- Steel notched plates
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- General Materials Science