Feng Wang , Junwen Yue , Wanzhen Wang , Weizhuo Shi
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引用次数: 0
摘要
本研究提出了一种评估 16 毫米厚 Q355B 钢缺口板（SNP）疲劳寿命的方法。该方法将总疲劳寿命计算分为两个阶段，即疲劳裂纹起始（FCI）寿命和疲劳裂纹扩展（FCP）寿命。本研究利用五组（60 个试样）疲劳试验，研究了应力振幅和标称最大应力对疲劳寿命的影响。根据测试数据和 FCI 寿命模型，得出了 Q355B-16 mm SNP 的 FCI 寿命计算公式。此外，利用试验和理论计算数据以及 FCP 寿命计算模型，建立了 Q355B-16 mm SNP 的 FCP 寿命预测公式。因此，Q355B-16 mm SNP 的总疲劳寿命就是 FCI 寿命和 FCP 寿命的总和。根据疲劳测试数据，验证了本文提出的考虑裂纹起始阶段的疲劳寿命计算方法的准确性。结果表明，与不考虑裂纹起始寿命的计算方法以及中国现行规范（GB50017-2017）推荐的疲劳寿命计算方法相比，该方法具有更高的精度。此外，误差分别为 -2.1 % 至 +19.3 %、-44.5 % 至 +18.1 % 和 -52 % 至 +98.4 %。
Unified fatigue life calculation of Q355B-16 mm steel notched plates considering crack initiation
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.
期刊介绍：
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.
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