Fatigue tests and assessment of high-yield-strength cold-rolled large-diameter ribbed steel bars

IF 6.5 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials Pub Date : 2024-12-13 DOI:10.1016/j.cscm.2024.e04088

Jin-dou Liu , Chuang Cui , Song Xia , Yan-qing Fu , Hai-lin Chang

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Abstract

Cold-rolled large-diameter ribbed steel bars have higher strength than hot-rolled steel bars but are susceptible to cracks, particularly at the root of the ribs, owing to the manufacturing process. This study investigated steel bars of 75 mm diameter produced using different manufacturing processes. Extensive testing of the specimens was conducted, including high-cycle fatigue tests under various high loadings, fatigue crack growth (FCG) rate at a stress ratio of 0.85, fracture surface analysis, and statistical analysis of the probabilities and FCG mechanisms. A fatigue life model considering the initial cracks in a ribbed steel bar was proposed based on the Paris and Walker models. Fewer rolling cycles and higher tempering temperatures accelerated the growth rate of the initial cracks. Finally, the FCG life was calculated using the integral equation under diverse processes and loading conditions. The critical thresholds for the initial crack length demonstrated the ability to withstand 2 × 10⁶ cycles under a stress amplitude of 88 MPa without fracture.

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高屈服强度冷轧大直径带肋钢筋疲劳试验与评价

冷轧大直径带肋钢筋比热轧钢筋具有更高的强度，但由于制造过程的原因，容易出现裂纹，特别是在肋根处。本研究考察了采用不同制造工艺生产的直径为75 mm的钢筋。对试件进行了广泛的试验，包括各种高载荷下的高周疲劳试验，应力比为0.85时的疲劳裂纹扩展速率，断口分析，以及概率和机制的统计分析。在巴黎模型和沃克模型的基础上，提出了考虑带肋钢筋初始裂纹的疲劳寿命模型。较少的轧制循环次数和较高的回火温度加速了初始裂纹的扩展速度。最后，利用积分方程计算了不同工艺和载荷条件下FCG的寿命。初始裂纹长度的临界阈值表明，在应力幅为88 MPa的情况下，能够承受2 × 106次循环而不断裂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Construction Materials Multiple-

CiteScore

7.60

自引率

19.40%

发文量

842

审稿时长

63 days

期刊介绍： Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.