Fatigue crack growth due to spectrum load produced by trains in a bridge

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-11-09 DOI:10.1016/j.ijfatigue.2024.108706

D.M. Neto , T.A. Narciso , E.R. Sérgio , A.S. Cruces , P. Lopez-Crespo , F.V. Antunes

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Abstract

The present paper studies fatigue crack growth (FCG) produced by a load pattern obtained numerically in a simulation of trains crossing a real bridge. It uses a model where the cyclic plastic deformation is assumed to be the main damage mechanism and that cumulative plastic strain at the crack tip is the driving parameter for FCG. The accumulation of damage was found to be very irregular along each load block, the major part occurring in the overload region. Plasticity induced crack closure is relatively high due to the periodic application of overloads, playing a major role. The overload produces crack tip blunting, increasing the effective load range in subsequent load cycles. The maximum elastic load range was quantified and used to eliminate load cycles not producing fatigue damage, which is important to reduce the numerical effort. The comparison of Finite Element Model (FEM) predictions with NASGRO results, showed that this gives a non-conservative difference of 23% in the number of load cycles after 1 mm of crack growth.

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桥梁中列车产生的频谱载荷导致疲劳裂纹增长

本文研究了在模拟火车通过真实桥梁时，通过数值获得的载荷模式产生的疲劳裂纹增长（FCG）。本文使用的模型假定循环塑性变形是主要的损伤机制，裂纹尖端的累积塑性应变是 FCG 的驱动参数。研究发现，沿每个荷载块的损伤累积非常不规则，主要发生在过载区域。由于周期性施加过载，塑性引起的裂纹闭合相对较高，起着主要作用。过载产生的裂纹尖端钝化，增加了后续载荷循环中的有效载荷范围。最大弹性载荷范围被量化并用于消除不会产生疲劳损伤的载荷循环，这对减少数值计算工作量非常重要。将有限元模型（FEM）预测结果与 NASGRO 结果进行比较后发现，在裂纹增长 1 毫米后，加载循环次数的非保守差异为 23%。

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

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.